Add crystal syntax, closes #118

README.md

@@ -34,6 +34,7 @@ Optionally download one of the [releases](https://github.com/sheerun/vim-polyglo
 - [clojure](https://github.com/guns/vim-clojure-static) (syntax, indent, autoload, ftplugin, ftdetect)
 - [coffee-script](https://github.com/kchmck/vim-coffee-script) (syntax, indent, compiler, autoload, ftplugin, ftdetect)
 - [cryptol](https://github.com/victoredwardocallaghan/cryptol.vim) (syntax, compiler, ftplugin, ftdetect)
+- [crystal](https://github.com/rhysd/vim-crystal) (syntax, indent, autoload, ftplugin, ftdetect)
 - [cql](https://github.com/elubow/cql-vim) (syntax, ftdetect)
 - [css](https://github.com/JulesWang/css.vim) (syntax)
 - [cucumber](https://github.com/tpope/vim-cucumber) (syntax, indent, compiler, ftplugin, ftdetect)

autoload/crystal_lang.vim

@@ -0,0 +1,332 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+let s:save_cpo = &cpo
+set cpo&vim
+
+let s:V = vital#of('crystal')
+let s:P = s:V.import('Process')
+let s:J = s:V.import('Web.JSON')
+let s:C = s:V.import('ColorEcho')
+
+function! s:echo_error(msg, ...) abort
+    echohl ErrorMsg
+    if a:0 == 0
+        echomsg a:msg
+    else
+        echomsg call('printf', [a:msg] + a:000)
+    endif
+    echohl None
+endfunction
+
+function! s:run_cmd(cmd) abort
+    if !executable(g:crystal_compiler_command)
+        throw "vim-crystal: Error: '" . g:crystal_compiler_command . "' command is not found."
+    endif
+    return s:P.system(a:cmd)
+endfunction
+
+function! s:find_root_by_spec(d) abort
+    let dir = finddir('spec', a:d . ';')
+    if dir ==# ''
+        return ''
+    endif
+
+    " Note: ':h:h' for {root}/spec/ -> {root}/spec -> {root}
+    return fnamemodify(dir, ':p:h:h')
+endfunction
+
+function! crystal_lang#entrypoint_for(file_path) abort
+    let parent_dir = fnamemodify(a:file_path, ':p:h')
+    let root_dir = s:find_root_by_spec(parent_dir)
+    if root_dir ==# ''
+        " No spec diretory found. No need to make temporary file
+        return a:file_path
+    endif
+
+    let temp_name = root_dir . '/__vim-crystal-temporary-entrypoint-' . fnamemodify(a:file_path, ':t')
+    let contents = [
+                \   'require "spec"',
+                \   'require "./spec/**"',
+                \   printf('require "./%s"', fnamemodify(a:file_path, ':p')[strlen(root_dir)+1 : ])
+                \ ]
+
+    let result = writefile(contents, temp_name)
+    if result == -1
+        " Note: When writefile() failed
+        return a:file_path
+    endif
+
+    return temp_name
+endfunction
+
+function! crystal_lang#tool(name, file, pos, option_str) abort
+    let entrypoint = crystal_lang#entrypoint_for(a:file)
+    let cmd = printf(
+                \   '%s tool %s --no-color %s --cursor %s:%d:%d %s',
+                \   g:crystal_compiler_command,
+                \   a:name,
+                \   a:option_str,
+                \   a:file,
+                \   a:pos[1],
+                \   a:pos[2],
+                \   entrypoint
+                \ )
+
+    try
+        let output = s:run_cmd(cmd)
+        return {'failed': s:P.get_last_status(), 'output': output}
+    finally
+        " Note:
+        " If the entry point is temporary file, delete it finally.
+        if a:file !=# entrypoint
+            call delete(entrypoint)
+        endif
+    endtry
+endfunction
+
+" `pos` is assumed a returned value from getpos()
+function! crystal_lang#impl(file, pos, option_str) abort
+    return crystal_lang#tool('implementations', a:file, a:pos, a:option_str)
+endfunction
+
+function! s:jump_to_impl(impl) abort
+    execute 'edit' a:impl.filename
+    call cursor(a:impl.line, a:impl.column)
+endfunction
+
+function! crystal_lang#jump_to_definition(file, pos) abort
+    echo 'analyzing definitions under cursor...'
+
+    let cmd_result = crystal_lang#impl(a:file, a:pos, '--format json')
+    if cmd_result.failed
+        return s:echo_error(cmd_result.output)
+    endif
+
+    let impl = s:J.decode(cmd_result.output)
+    if impl.status !=# 'ok'
+        return s:echo_error(impl.message)
+    endif
+
+    if len(impl.implementations) == 1
+        call s:jump_to_impl(impl.implementations[0])
+        return
+    endif
+
+    let message = "Multiple definitions detected.  Choose a number\n\n"
+    for idx in range(len(impl.implementations))
+        let i = impl.implementations[idx]
+        let message .= printf("[%d] %s:%d:%d\n", idx, i.filename, i.line, i.column)
+    endfor
+    let message .= "\n"
+    let idx = str2nr(input(message, "\n> "))
+    call s:jump_to_impl(impl.implementations[idx])
+endfunction
+
+function! crystal_lang#context(file, pos, option_str) abort
+    return crystal_lang#tool('context', a:file, a:pos, a:option_str)
+endfunction
+
+function! crystal_lang#type_hierarchy(file, option_str) abort
+    let cmd = printf(
+                \   '%s tool hierarchy --no-color %s %s',
+                \   g:crystal_compiler_command,
+                \   a:option_str,
+                \   a:file
+                \ )
+
+    return s:run_cmd(cmd)
+endfunction
+
+function! s:find_completion_start() abort
+    let c = col('.')
+    if c <= 1
+        return -1
+    endif
+
+    let line = getline('.')[:c-2]
+    return match(line, '\w\+$')
+endfunction
+
+function! crystal_lang#complete(findstart, base) abort
+    if a:findstart
+        echom 'find start'
+        return s:find_completion_start()
+    endif
+
+    let cmd_result = crystal_lang#context(expand('%'), getpos('.'), '--format json')
+    if cmd_result.failed
+        return
+    endif
+
+    let contexts = s:J.decode(cmd_result.output)
+    if contexts.status !=# 'ok'
+        return
+    endif
+
+    let candidates = []
+
+    for c in contexts.contexts
+        for [name, desc] in items(c)
+            let candidates += [{
+                        \   'word': name,
+                        \   'menu': ': ' . desc . ' [var]',
+                        \ }]
+        endfor
+    endfor
+
+    return candidates
+endfunction
+
+function! crystal_lang#get_spec_switched_path(absolute_path) abort
+    let base = fnamemodify(a:absolute_path, ':t:r')
+
+    " TODO: Make cleverer
+    if base =~# '_spec$'
+        let parent = fnamemodify(substitute(a:absolute_path, '/spec/', '/src/', ''), ':h')
+        return parent . '/' . matchstr(base, '.\+\ze_spec$') . '.cr'
+    else
+        let parent = fnamemodify(substitute(a:absolute_path, '/src/', '/spec/', ''), ':h')
+        return parent . '/' . base . '_spec.cr'
+    endif
+endfunction
+
+function! crystal_lang#switch_spec_file(...) abort
+    let path = a:0 == 0 ? expand('%:p') : fnamemodify(a:1, ':p')
+    if path !~# '.cr$'
+        return s:echo_error('Not crystal source file: ' . path)
+    endif
+
+    execute 'edit!' crystal_lang#get_spec_switched_path(path)
+endfunction
+
+function! s:run_spec(root, path, ...) abort
+    " Note:
+    " `crystal spec` can't understand absolute path.
+    let cmd = printf(
+            \   '%s spec %s%s',
+            \   g:crystal_compiler_command,
+            \   a:path,
+            \   a:0 == 0 ? '' : (':' . a:1)
+            \ )
+
+    let saved_cwd = getcwd()
+    let cd = haslocaldir() ? 'lcd' : 'cd'
+    try
+        execute cd a:root
+        call s:C.echo(s:run_cmd(cmd))
+    finally
+        execute cd saved_cwd
+    endtry
+endfunction
+
+function! crystal_lang#run_all_spec(...) abort
+    let path = a:0 == 0 ? expand('%:p:h') : a:1
+    let root_path = s:find_root_by_spec(path)
+    if root_path ==# ''
+        return s:echo_error("'spec' directory is not found")
+    endif
+    call s:run_spec(root_path, 'spec')
+endfunction
+
+function! crystal_lang#run_current_spec(...) abort
+    " /foo/bar/src/poyo.cr
+    let path = a:0 == 0 ? expand('%:p') : fnamemodify(a:1, ':p')
+    if path !~# '.cr$'
+        return s:echo_error('Not crystal source file: ' . path)
+    endif
+
+    " /foo/bar/src
+    let source_dir = fnamemodify(path, ':h')
+
+    " /foo/bar
+    let root_dir = s:find_root_by_spec(source_dir)
+    if root_dir ==# ''
+        return s:echo_error("'spec' directory is not found")
+    endif
+
+    " src
+    let rel_path = source_dir[strlen(root_dir)+1 : ]
+
+    if path =~# '_spec.cr$'
+        call s:run_spec(root_dir, path[strlen(root_dir)+1 : ], line('.'))
+    else
+        let spec_path = substitute(rel_path, '^src', 'spec', '') . '/' . fnamemodify(path, ':t:r') . '_spec.cr'
+        if !filereadable(root_dir . '/' . spec_path)
+            return s:echo_error('Error: Could not find a spec source corresponding to ' . path)
+        endif
+        call s:run_spec(root_dir, spec_path)
+    endif
+endfunction
+
+function! crystal_lang#format_string(code, ...) abort
+    let cmd = printf(
+            \   '%s tool format --no-color %s -',
+            \   g:crystal_compiler_command,
+            \   get(a:, 1, '')
+            \ )
+    let output = s:P.system(cmd, a:code)
+    if s:P.get_last_status()
+        throw 'vim-crystal: Error on formatting: ' . output
+    endif
+    return output
+endfunction
+
+function! s:get_saved_states() abort
+    let result = {}
+    let fname = bufname('%')
+    let current_winnr = winnr()
+    for i in range(1, winnr('$'))
+        let bufnr = winbufnr(i)
+        if bufnr == -1
+            continue
+        endif
+        if bufname(bufnr) ==# fname
+            execute i 'wincmd w'
+            let result[i] = {
+                \     'pos': getpos('.'),
+                \     'screen': winsaveview()
+                \ }
+        endif
+    endfor
+    execute current_winnr 'wincmd w'
+    return result
+endfunction
+
+function! crystal_lang#format(option_str) abort
+    if !executable(g:crystal_compiler_command)
+        " Finish command silently
+        return
+    endif
+
+    let formatted = crystal_lang#format_string(join(getline(1, '$'), "\n"), a:option_str)
+    let formatted = substitute(formatted, '\n$', '', '')
+
+    let sel_save = &l:selection
+    let ve_save = &virtualedit
+    let &l:selection = 'inclusive'
+    let &virtualedit = ''
+    let [save_g_reg, save_g_regtype] = [getreg('g'), getregtype('g')]
+    let windows_save = s:get_saved_states()
+
+    try
+        call setreg('g', formatted, 'v')
+        silent normal! ggvG$"gp
+    finally
+        call setreg('g', save_g_reg, save_g_regtype)
+        let &l:selection = sel_save
+        let &virtualedit = ve_save
+        let winnr = winnr()
+        for winnr in keys(windows_save)
+            let w = windows_save[winnr]
+            execute winnr 'wincmd w'
+            call setpos('.', w.pos)
+            call winrestview(w.screen)
+        endfor
+        execute winnr 'wincmd w'
+    endtry
+endfunction
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+endif

autoload/vital.vim

@@ -0,0 +1,16 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+function! vital#of(name) abort
+  let files = globpath(&runtimepath, 'autoload/vital/' . a:name . '.vital')
+  let file = split(files, "\n")
+  if empty(file)
+    throw 'vital: version file not found: ' . a:name
+  endif
+  let ver = readfile(file[0], 'b')
+  if empty(ver)
+    throw 'vital: invalid version file: ' . a:name
+  endif
+  return vital#_{substitute(ver[0], '\W', '', 'g')}#new()
+endfunction
+
+endif

autoload/vital/_crystal.vim

@@ -0,0 +1,313 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+let s:self_version = expand('<sfile>:t:r')
+let s:self_file = expand('<sfile>')
+
+" Note: The extra argument to globpath() was added in Patch 7.2.051.
+let s:globpath_third_arg = v:version > 702 || v:version == 702 && has('patch51')
+
+let s:loaded = {}
+let s:cache_module_path = {}
+let s:cache_sid = {}
+
+let s:_vital_files_cache_runtimepath = ''
+let s:_vital_files_cache = []
+let s:_unify_path_cache = {}
+
+function! s:import(name, ...) abort
+  let target = {}
+  let functions = []
+  for a in a:000
+    if type(a) == type({})
+      let target = a
+    elseif type(a) == type([])
+      let functions = a
+    endif
+    unlet a
+  endfor
+  let module = s:_import(a:name)
+  if empty(functions)
+    call extend(target, module, 'keep')
+  else
+    for f in functions
+      if has_key(module, f) && !has_key(target, f)
+        let target[f] = module[f]
+      endif
+    endfor
+  endif
+  return target
+endfunction
+
+function! s:load(...) dict abort
+  for arg in a:000
+    let [name; as] = type(arg) == type([]) ? arg[: 1] : [arg, arg]
+    let target = split(join(as, ''), '\W\+')
+    let dict = self
+    let dict_type = type({})
+    while !empty(target)
+      let ns = remove(target, 0)
+      if !has_key(dict, ns)
+        let dict[ns] = {}
+      endif
+      if type(dict[ns]) == dict_type
+        let dict = dict[ns]
+      else
+        unlet dict
+        break
+      endif
+    endwhile
+
+    if exists('dict')
+      call extend(dict, s:_import(name))
+    endif
+    unlet arg
+  endfor
+  return self
+endfunction
+
+function! s:unload() abort
+  let s:loaded = {}
+  let s:cache_sid = {}
+  let s:cache_module_path = {}
+endfunction
+
+function! s:exists(name) abort
+  return s:_get_module_path(a:name) !=# ''
+endfunction
+
+function! s:search(pattern) abort
+  let paths = s:_vital_files(a:pattern)
+  let modules = sort(map(paths, 's:_file2module(v:val)'))
+  return s:_uniq(modules)
+endfunction
+
+function! s:expand_modules(entry, all) abort
+  if type(a:entry) == type([])
+    let candidates = s:_concat(map(copy(a:entry), 's:search(v:val)'))
+    if empty(candidates)
+      throw printf('vital: Any of module %s is not found', string(a:entry))
+    endif
+    if eval(join(map(copy(candidates), 'has_key(a:all, v:val)'), '+'))
+      let modules = []
+    else
+      let modules = [candidates[0]]
+    endif
+  else
+    let modules = s:search(a:entry)
+    if empty(modules)
+      throw printf('vital: Module %s is not found', a:entry)
+    endif
+  endif
+  call filter(modules, '!has_key(a:all, v:val)')
+  for module in modules
+    let a:all[module] = 1
+  endfor
+  return modules
+endfunction
+
+function! s:_import(name) abort
+  if type(a:name) == type(0)
+    return s:_build_module(a:name)
+  endif
+  let path = s:_get_module_path(a:name)
+  if path ==# ''
+    throw 'vital: module not found: ' . a:name
+  endif
+  let sid = s:_get_sid_by_script(path)
+  if !sid
+    try
+      execute 'source' fnameescape(path)
+    catch /^Vim\%((\a\+)\)\?:E484/
+      throw 'vital: module not found: ' . a:name
+    catch /^Vim\%((\a\+)\)\?:E127/
+      " Ignore.
+    endtry
+
+    let sid = s:_get_sid_by_script(path)
+  endif
+  return s:_build_module(sid)
+endfunction
+
+function! s:_get_module_path(name) abort
+  let key = a:name . '_'
+  if has_key(s:cache_module_path, key)
+    return s:cache_module_path[key]
+  endif
+  if s:_is_absolute_path(a:name) && filereadable(a:name)
+    return a:name
+  endif
+  if a:name ==# ''
+    let paths = [s:self_file]
+  elseif a:name =~# '\v^\u\w*%(\.\u\w*)*$'
+    let paths = s:_vital_files(a:name)
+  else
+    throw 'vital: Invalid module name: ' . a:name
+  endif
+
+  call filter(paths, 'filereadable(expand(v:val, 1))')
+  let path = get(paths, 0, '')
+  let s:cache_module_path[key] = path
+  return path
+endfunction
+
+function! s:_get_sid_by_script(path) abort
+  if has_key(s:cache_sid, a:path)
+    return s:cache_sid[a:path]
+  endif
+
+  let path = s:_unify_path(a:path)
+  for line in filter(split(s:_redir('scriptnames'), "\n"),
+  \                  'stridx(v:val, s:self_version) > 0')
+    let list = matchlist(line, '^\s*\(\d\+\):\s\+\(.\+\)\s*$')
+    if !empty(list) && s:_unify_path(list[2]) ==# path
+      let s:cache_sid[a:path] = list[1] - 0
+      return s:cache_sid[a:path]
+    endif
+  endfor
+  return 0
+endfunction
+
+function! s:_file2module(file) abort
+  let filename = fnamemodify(a:file, ':p:gs?[\\/]?/?')
+  let tail = matchstr(filename, 'autoload/vital/_\w\+/\zs.*\ze\.vim$')
+  return join(split(tail, '[\\/]\+'), '.')
+endfunction
+
+if filereadable(expand('<sfile>:r') . '.VIM')
+  " resolve() is slow, so we cache results.
+  " Note: On windows, vim can't expand path names from 8.3 formats.
+  " So if getting full path via <sfile> and $HOME was set as 8.3 format,
+  " vital load duplicated scripts. Below's :~ avoid this issue.
+  function! s:_unify_path(path) abort
+    if has_key(s:_unify_path_cache, a:path)
+      return s:_unify_path_cache[a:path]
+    endif
+    let value = tolower(fnamemodify(resolve(fnamemodify(
+    \                   a:path, ':p')), ':~:gs?[\\/]?/?'))
+    let s:_unify_path_cache[a:path] = value
+    return value
+  endfunction
+else
+  function! s:_unify_path(path) abort
+    return resolve(fnamemodify(a:path, ':p:gs?[\\/]?/?'))
+  endfunction
+endif
+
+if s:globpath_third_arg
+  function! s:_runtime_files(path) abort
+    return split(globpath(&runtimepath, a:path, 1), "\n")
+  endfunction
+else
+  function! s:_runtime_files(path) abort
+    return split(globpath(&runtimepath, a:path), "\n")
+  endfunction
+endif
+
+function! s:_vital_files(pattern) abort
+  if s:_vital_files_cache_runtimepath !=# &runtimepath
+    let path = printf('autoload/vital/%s/**/*.vim', s:self_version)
+    let s:_vital_files_cache = s:_runtime_files(path)
+    let mod = ':p:gs?[\\/]\+?/?'
+    call map(s:_vital_files_cache, 'fnamemodify(v:val, mod)')
+    let s:_vital_files_cache_runtimepath = &runtimepath
+  endif
+  let target = substitute(a:pattern, '\.', '/', 'g')
+  let target = substitute(target, '\*', '[^/]*', 'g')
+  let regexp = printf('autoload/vital/%s/%s.vim', s:self_version, target)
+  return filter(copy(s:_vital_files_cache), 'v:val =~# regexp')
+endfunction
+
+" Copy from System.Filepath
+if has('win16') || has('win32') || has('win64')
+  function! s:_is_absolute_path(path) abort
+    return a:path =~? '^[a-z]:[/\\]'
+  endfunction
+else
+  function! s:_is_absolute_path(path) abort
+    return a:path[0] ==# '/'
+  endfunction
+endif
+
+function! s:_build_module(sid) abort
+  if has_key(s:loaded, a:sid)
+    return copy(s:loaded[a:sid])
+  endif
+  let functions = s:_get_functions(a:sid)
+
+  let prefix = '<SNR>' . a:sid . '_'
+  let module = {}
+  for func in functions
+    let module[func] = function(prefix . func)
+  endfor
+  if has_key(module, '_vital_created')
+    call module._vital_created(module)
+  endif
+  let export_module = filter(copy(module), 'v:key =~# "^\\a"')
+  let s:loaded[a:sid] = get(g:, 'vital_debug', 0) ? module : export_module
+  if has_key(module, '_vital_loaded')
+    let V = vital#{s:self_version}#new()
+    call module._vital_loaded(V)
+  endif
+  return copy(s:loaded[a:sid])
+endfunction
+
+if exists('+regexpengine')
+  function! s:_get_functions(sid) abort
+    let funcs = s:_redir(printf("function /\\%%#=2^\<SNR>%d_", a:sid))
+    let map_pat = '<SNR>' . a:sid . '_\zs\w\+'
+    return map(split(funcs, "\n"), 'matchstr(v:val, map_pat)')
+  endfunction
+else
+  function! s:_get_functions(sid) abort
+    let prefix = '<SNR>' . a:sid . '_'
+    let funcs = s:_redir('function')
+    let filter_pat = '^\s*function ' . prefix
+    let map_pat = prefix . '\zs\w\+'
+    return map(filter(split(funcs, "\n"),
+    \          'stridx(v:val, prefix) > 0 && v:val =~# filter_pat'),
+    \          'matchstr(v:val, map_pat)')
+  endfunction
+endif
+
+if exists('*uniq')
+  function! s:_uniq(list) abort
+    return uniq(a:list)
+  endfunction
+else
+  function! s:_uniq(list) abort
+    let i = len(a:list) - 1
+    while 0 < i
+      if a:list[i] ==# a:list[i - 1]
+        call remove(a:list, i)
+        let i -= 2
+      else
+        let i -= 1
+      endif
+    endwhile
+    return a:list
+  endfunction
+endif
+
+function! s:_concat(lists) abort
+  let result_list = []
+  for list in a:lists
+    let result_list += list
+  endfor
+  return result_list
+endfunction
+
+function! s:_redir(cmd) abort
+  let [save_verbose, save_verbosefile] = [&verbose, &verbosefile]
+  set verbose=0 verbosefile=
+  redir => res
+    silent! execute a:cmd
+  redir END
+  let [&verbose, &verbosefile] = [save_verbose, save_verbosefile]
+  return res
+endfunction
+
+function! vital#{s:self_version}#new() abort
+  return s:_import('')
+endfunction
+
+endif

autoload/vital/_crystal/ColorEcho.vim

@@ -0,0 +1,182 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+scriptencoding utf-8
+let s:save_cpo = &cpo
+set cpo&vim
+
+function! s:_is_available() abort
+    if has('gui_running')
+        return 1
+    endif
+
+    if has('win32') || has('win64')
+        return 0
+    endif
+
+    return exists('&t_Co') && (&t_Co == 8 || &t_Co == 256)
+endfunction
+
+function! s:is_available() abort
+    if exists('s:is_available_cache')
+        return s:is_available_cache
+    endif
+    let s:is_available_cache = s:_is_available()
+    return s:is_available_cache
+endfunction
+
+function! s:_define_ansi_highlights() abort
+    hi ansiNone cterm=NONE gui=NONE
+
+    hi ansiBlackBg ctermbg=black guibg=black cterm=none gui=none
+    hi ansiRedBg ctermbg=red guibg=red cterm=none gui=none
+    hi ansiGreenBg ctermbg=green guibg=green cterm=none gui=none
+    hi ansiYellowBg ctermbg=yellow guibg=yellow cterm=none gui=none
+    hi ansiBlueBg ctermbg=blue guibg=blue cterm=none gui=none
+    hi ansiMagentaBg ctermbg=magenta guibg=magenta cterm=none gui=none
+    hi ansiCyanBg ctermbg=cyan guibg=cyan cterm=none gui=none
+    hi ansiWhiteBg ctermbg=white guibg=white cterm=none gui=none
+    hi ansiGrayBg ctermbg=gray guibg=gray cterm=none gui=none
+
+    hi ansiBlackFg ctermfg=black guifg=black cterm=none gui=none
+    hi ansiRedFg ctermfg=red guifg=red cterm=none gui=none
+    hi ansiGreenFg ctermfg=green guifg=green cterm=none gui=none
+    hi ansiYellowFg ctermfg=yellow guifg=yellow cterm=none gui=none
+    hi ansiBlueFg ctermfg=blue guifg=blue cterm=none gui=none
+    hi ansiMagentaFg ctermfg=magenta guifg=magenta cterm=none gui=none
+    hi ansiCyanFg ctermfg=cyan guifg=cyan cterm=none gui=none
+    hi ansiWhiteFg ctermfg=white guifg=white cterm=none gui=none
+    hi ansiGrayFg ctermfg=gray guifg=gray cterm=none gui=none
+
+    hi ansiBoldBlackFg ctermfg=black guifg=black cterm=none gui=none cterm=bold gui=bold
+    hi ansiBoldRedFg ctermfg=red guifg=red cterm=none gui=none cterm=bold gui=bold
+    hi ansiBoldGreenFg ctermfg=green guifg=green cterm=none gui=none cterm=bold gui=bold
+    hi ansiBoldYellowFg ctermfg=yellow guifg=yellow cterm=none gui=none cterm=bold gui=bold
+    hi ansiBoldBlueFg ctermfg=blue guifg=blue cterm=none gui=none cterm=bold gui=bold
+    hi ansiBoldMagentaFg ctermfg=magenta guifg=magenta cterm=none gui=none cterm=bold gui=bold
+    hi ansiBoldCyanFg ctermfg=cyan guifg=cyan cterm=none gui=none cterm=bold gui=bold
+    hi ansiBoldWhiteFg ctermfg=white guifg=white cterm=none gui=none cterm=bold gui=bold
+    hi ansiBoldGrayFg ctermfg=gray guifg=gray cterm=none gui=none cterm=bold gui=bold
+
+    hi ansiUnderlineBlackFg ctermfg=black guifg=black cterm=none gui=none cterm=underline gui=underline
+    hi ansiUnderlineRedFg ctermfg=red guifg=red cterm=none gui=none cterm=underline gui=underline
+    hi ansiUnderlineGreenFg ctermfg=green guifg=green cterm=none gui=none cterm=underline gui=underline
+    hi ansiUnderlineYellowFg ctermfg=yellow guifg=yellow cterm=none gui=none cterm=underline gui=underline
+    hi ansiUnderlineBlueFg ctermfg=blue guifg=blue cterm=none gui=none cterm=underline gui=underline
+    hi ansiUnderlineMagentaFg ctermfg=magenta guifg=magenta cterm=none gui=none cterm=underline gui=underline
+    hi ansiUnderlineCyanFg ctermfg=cyan guifg=cyan cterm=none gui=none cterm=underline gui=underline
+    hi ansiUnderlineWhiteFg ctermfg=white guifg=white cterm=none gui=none cterm=underline gui=underline
+    hi ansiUnderlineGrayFg ctermfg=gray guifg=gray cterm=none gui=none cterm=underline gui=underline
+
+endfunction
+
+let s:echorizer = {
+        \   'value': '',
+        \   'attr': '',
+        \ }
+
+function s:echorizer.eat() abort
+    let matched = match(self.value, '\e\[\d*;\=m')
+    if matched == -1
+        return {}
+    endif
+
+    let matched_end = matchend(self.value, '\e\[\d*;\=m')
+
+    let token = {
+        \   'body': matched == 0 ? '' : self.value[ : matched-1],
+        \   'code': matchstr(self.value[matched : matched_end-1], '\d\+')
+        \ }
+
+    let self.value = self.value[matched_end : ]
+
+    return token
+endfunction
+
+let s:COLORS = {
+    \   0: "None",
+    \   30: "BlackFg",
+    \   31: "RedFg",
+    \   32: "GreenFg",
+    \   33: "YellowFg",
+    \   34: "BlueFg",
+    \   35: "MagentaFg",
+    \   36: "CyanFg",
+    \   37: "WhiteFg",
+    \   40: "BlackBg",
+    \   41: "RedBg",
+    \   42: "GreenBg",
+    \   43: "YellowBg",
+    \   44: "BlueBg",
+    \   45: "MagentaBg",
+    \   46: "CyanBg",
+    \   47: "WhiteBg",
+    \   90: "GrayFg",
+    \ }
+
+function s:echorizer.echo_ansi(code) abort
+    if !has_key(s:COLORS, a:code)
+        return
+    endif
+
+    execute 'echohl' 'ansi' . self.attr . s:COLORS[a:code]
+
+    if a:code == 0
+        let self.attr = ''
+    endif
+endfunction
+
+function s:echorizer.echo() abort
+    echo
+
+    while 1
+        let token = self.eat()
+        if token == {}
+            break
+        endif
+
+        if token.body !=# ''
+            echon token.body
+        endif
+
+        " TODO: Now only one attribute can be specified
+        if token.code == 1
+            let self.attr = 'Bold'
+        elseif token.code == 4
+            let self.attr = 'Underline'
+        elseif token.code ==# ''
+            call self.echo_ansi(0)
+        else
+            call self.echo_ansi(token.code)
+        endif
+    endwhile
+
+    echon self.value
+    echohl None
+    let self.value = ''
+endfunction
+
+function! s:get_echorizer(str) abort
+    let e = deepcopy(s:echorizer)
+    let e.value = a:str
+    return e
+endfunction
+
+function! s:echo(str) abort
+    if !s:is_available()
+        echo substitute(a:str, '\e[.*m', '', 'g')
+        return
+    endif
+
+    if !exists('g:__vital_color_echo_already_highlighted')
+        call s:_define_ansi_highlights()
+        let g:__vital_color_echo_already_highlighted = 1
+    endif
+
+    let echorizer = s:get_echorizer(a:str)
+    call echorizer.echo()
+endfunction
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+endif

autoload/vital/_crystal/Data/List.vim

@@ -0,0 +1,446 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+" Utilities for list.
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+function! s:pop(list) abort
+  return remove(a:list, -1)
+endfunction
+
+function! s:push(list, val) abort
+  call add(a:list, a:val)
+  return a:list
+endfunction
+
+function! s:shift(list) abort
+  return remove(a:list, 0)
+endfunction
+
+function! s:unshift(list, val) abort
+  return insert(a:list, a:val)
+endfunction
+
+function! s:cons(x, xs) abort
+  return [a:x] + a:xs
+endfunction
+
+function! s:conj(xs, x) abort
+  return a:xs + [a:x]
+endfunction
+
+" Removes duplicates from a list.
+function! s:uniq(list) abort
+  return s:uniq_by(a:list, 'v:val')
+endfunction
+
+" Removes duplicates from a list.
+function! s:uniq_by(list, f) abort
+  let list = map(copy(a:list), printf('[v:val, %s]', a:f))
+  let i = 0
+  let seen = {}
+  while i < len(list)
+    let key = string(list[i][1])
+    if has_key(seen, key)
+      call remove(list, i)
+    else
+      let seen[key] = 1
+      let i += 1
+    endif
+  endwhile
+  return map(list, 'v:val[0]')
+endfunction
+
+function! s:clear(list) abort
+  if !empty(a:list)
+    unlet! a:list[0 : len(a:list) - 1]
+  endif
+  return a:list
+endfunction
+
+" Concatenates a list of lists.
+" XXX: Should we verify the input?
+function! s:concat(list) abort
+  let memo = []
+  for Value in a:list
+    let memo += Value
+  endfor
+  return memo
+endfunction
+
+" Take each elements from lists to a new list.
+function! s:flatten(list, ...) abort
+  let limit = a:0 > 0 ? a:1 : -1
+  let memo = []
+  if limit == 0
+    return a:list
+  endif
+  let limit -= 1
+  for Value in a:list
+    let memo +=
+          \ type(Value) == type([]) ?
+          \   s:flatten(Value, limit) :
+          \   [Value]
+    unlet! Value
+  endfor
+  return memo
+endfunction
+
+" Sorts a list with expression to compare each two values.
+" a:a and a:b can be used in {expr}.
+function! s:sort(list, expr) abort
+  if type(a:expr) == type(function('function'))
+    return sort(a:list, a:expr)
+  endif
+  let s:expr = a:expr
+  return sort(a:list, 's:_compare')
+endfunction
+
+function! s:_compare(a, b) abort
+  return eval(s:expr)
+endfunction
+
+" Sorts a list using a set of keys generated by mapping the values in the list
+" through the given expr.
+" v:val is used in {expr}
+function! s:sort_by(list, expr) abort
+  let pairs = map(a:list, printf('[v:val, %s]', a:expr))
+  return map(s:sort(pairs,
+  \      'a:a[1] ==# a:b[1] ? 0 : a:a[1] ># a:b[1] ? 1 : -1'), 'v:val[0]')
+endfunction
+
+" Returns a maximum value in {list} through given {expr}.
+" Returns 0 if {list} is empty.
+" v:val is used in {expr}
+function! s:max_by(list, expr) abort
+  if empty(a:list)
+    return 0
+  endif
+  let list = map(copy(a:list), a:expr)
+  return a:list[index(list, max(list))]
+endfunction
+
+" Returns a minimum value in {list} through given {expr}.
+" Returns 0 if {list} is empty.
+" v:val is used in {expr}
+" FIXME: -0x80000000 == 0x80000000
+function! s:min_by(list, expr) abort
+  return s:max_by(a:list, '-(' . a:expr . ')')
+endfunction
+
+" Returns List of character sequence between [a:from, a:to]
+" e.g.: s:char_range('a', 'c') returns ['a', 'b', 'c']
+function! s:char_range(from, to) abort
+  return map(
+  \   range(char2nr(a:from), char2nr(a:to)),
+  \   'nr2char(v:val)'
+  \)
+endfunction
+
+" Returns true if a:list has a:value.
+" Returns false otherwise.
+function! s:has(list, value) abort
+  return index(a:list, a:value) isnot -1
+endfunction
+
+" Returns true if a:list[a:index] exists.
+" Returns false otherwise.
+" NOTE: Returns false when a:index is negative number.
+function! s:has_index(list, index) abort
+  " Return true when negative index?
+  " let index = a:index >= 0 ? a:index : len(a:list) + a:index
+  return 0 <= a:index && a:index < len(a:list)
+endfunction
+
+" similar to Haskell's Data.List.span
+function! s:span(f, xs) abort
+  let border = len(a:xs)
+  for i in range(len(a:xs))
+    if !eval(substitute(a:f, 'v:val', string(a:xs[i]), 'g'))
+      let border = i
+      break
+    endif
+  endfor
+  return border == 0 ? [[], copy(a:xs)] : [a:xs[: border - 1], a:xs[border :]]
+endfunction
+
+" similar to Haskell's Data.List.break
+function! s:break(f, xs) abort
+  return s:span(printf('!(%s)', a:f), a:xs)
+endfunction
+
+" similar to Haskell's Data.List.takeWhile
+function! s:take_while(f, xs) abort
+  return s:span(a:f, a:xs)[0]
+endfunction
+
+" similar to Haskell's Data.List.partition
+function! s:partition(f, xs) abort
+  return [filter(copy(a:xs), a:f), filter(copy(a:xs), '!(' . a:f . ')')]
+endfunction
+
+" similar to Haskell's Prelude.all
+function! s:all(f, xs) abort
+  return !s:any(printf('!(%s)', a:f), a:xs)
+endfunction
+
+" similar to Haskell's Prelude.any
+function! s:any(f, xs) abort
+  return !empty(filter(map(copy(a:xs), a:f), 'v:val'))
+endfunction
+
+" similar to Haskell's Prelude.and
+function! s:and(xs) abort
+  return s:all('v:val', a:xs)
+endfunction
+
+" similar to Haskell's Prelude.or
+function! s:or(xs) abort
+  return s:any('v:val', a:xs)
+endfunction
+
+function! s:map_accum(expr, xs, init) abort
+  let memo = []
+  let init = a:init
+  for x in a:xs
+    let expr = substitute(a:expr, 'v:memo', init, 'g')
+    let expr = substitute(expr, 'v:val', x, 'g')
+    let [tmp, init] = eval(expr)
+    call add(memo, tmp)
+  endfor
+  return memo
+endfunction
+
+" similar to Haskell's Prelude.foldl
+function! s:foldl(f, init, xs) abort
+  let memo = a:init
+  for x in a:xs
+    let expr = substitute(a:f, 'v:val', string(x), 'g')
+    let expr = substitute(expr, 'v:memo', string(memo), 'g')
+    unlet memo
+    let memo = eval(expr)
+  endfor
+  return memo
+endfunction
+
+" similar to Haskell's Prelude.foldl1
+function! s:foldl1(f, xs) abort
+  if len(a:xs) == 0
+    throw 'vital: Data.List: foldl1'
+  endif
+  return s:foldl(a:f, a:xs[0], a:xs[1:])
+endfunction
+
+" similar to Haskell's Prelude.foldr
+function! s:foldr(f, init, xs) abort
+  return s:foldl(a:f, a:init, reverse(copy(a:xs)))
+endfunction
+
+" similar to Haskell's Prelude.fold11
+function! s:foldr1(f, xs) abort
+  if len(a:xs) == 0
+    throw 'vital: Data.List: foldr1'
+  endif
+  return s:foldr(a:f, a:xs[-1], a:xs[0:-2])
+endfunction
+
+" similar to python's zip()
+function! s:zip(...) abort
+  return map(range(min(map(copy(a:000), 'len(v:val)'))), "map(copy(a:000), 'v:val['.v:val.']')")
+endfunction
+
+" similar to zip(), but goes until the longer one.
+function! s:zip_fill(xs, ys, filler) abort
+  if empty(a:xs) && empty(a:ys)
+    return []
+  elseif empty(a:ys)
+    return s:cons([a:xs[0], a:filler], s:zip_fill(a:xs[1 :], [], a:filler))
+  elseif empty(a:xs)
+    return s:cons([a:filler, a:ys[0]], s:zip_fill([], a:ys[1 :], a:filler))
+  else
+    return s:cons([a:xs[0], a:ys[0]], s:zip_fill(a:xs[1 :], a:ys[1: ], a:filler))
+  endif
+endfunction
+
+" Inspired by Ruby's with_index method.
+function! s:with_index(list, ...) abort
+  let base = a:0 > 0 ? a:1 : 0
+  return map(copy(a:list), '[v:val, v:key + base]')
+endfunction
+
+" similar to Ruby's detect or Haskell's find.
+function! s:find(list, default, f) abort
+  for x in a:list
+    if eval(substitute(a:f, 'v:val', string(x), 'g'))
+      return x
+    endif
+  endfor
+  return a:default
+endfunction
+
+" Returns the index of the first element which satisfies the given expr.
+function! s:find_index(xs, f, ...) abort
+  let len = len(a:xs)
+  let start = a:0 > 0 ? (a:1 < 0 ? len + a:1 : a:1) : 0
+  let default = a:0 > 1 ? a:2 : -1
+  if start >=# len || start < 0
+    return default
+  endif
+  for i in range(start, len - 1)
+    if eval(substitute(a:f, 'v:val', string(a:xs[i]), 'g'))
+      return i
+    endif
+  endfor
+  return default
+endfunction
+
+" Returns the index of the last element which satisfies the given expr.
+function! s:find_last_index(xs, f, ...) abort
+  let len = len(a:xs)
+  let start = a:0 > 0 ? (a:1 < 0 ? len + a:1 : a:1) : len - 1
+  let default = a:0 > 1 ? a:2 : -1
+  if start >=# len || start < 0
+    return default
+  endif
+  for i in range(start, 0, -1)
+    if eval(substitute(a:f, 'v:val', string(a:xs[i]), 'g'))
+      return i
+    endif
+  endfor
+  return default
+endfunction
+
+" Similar to find_index but returns the list of indices satisfying the given expr.
+function! s:find_indices(xs, f, ...) abort
+  let len = len(a:xs)
+  let start = a:0 > 0 ? (a:1 < 0 ? len + a:1 : a:1) : 0
+  let result = []
+  if start >=# len || start < 0
+    return result
+  endif
+  for i in range(start, len - 1)
+    if eval(substitute(a:f, 'v:val', string(a:xs[i]), 'g'))
+      call add(result, i)
+    endif
+  endfor
+  return result
+endfunction
+
+" Return non-zero if a:list1 and a:list2 have any common item(s).
+" Return zero otherwise.
+function! s:has_common_items(list1, list2) abort
+  return !empty(filter(copy(a:list1), 'index(a:list2, v:val) isnot -1'))
+endfunction
+
+function! s:intersect(list1, list2) abort
+  let items = []
+  " for funcref
+  for X in a:list1
+    if index(a:list2, X) != -1 && index(items, X) == -1
+      let items += [X]
+    endif
+  endfor
+  return items
+endfunction
+
+" similar to Ruby's group_by.
+function! s:group_by(xs, f) abort
+  let result = {}
+  let list = map(copy(a:xs), printf('[v:val, %s]', a:f))
+  for x in list
+    let Val = x[0]
+    let key = type(x[1]) !=# type('') ? string(x[1]) : x[1]
+    if has_key(result, key)
+      call add(result[key], Val)
+    else
+      let result[key] = [Val]
+    endif
+    unlet Val
+  endfor
+  return result
+endfunction
+
+function! s:_default_compare(a, b) abort
+  return a:a <# a:b ? -1 : a:a ># a:b ? 1 : 0
+endfunction
+
+function! s:binary_search(list, value, ...) abort
+  let Predicate = a:0 >= 1 ? a:1 : 's:_default_compare'
+  let dic = a:0 >= 2 ? a:2 : {}
+  let start = 0
+  let end = len(a:list) - 1
+
+  while 1
+    if start > end
+      return -1
+    endif
+
+    let middle = (start + end) / 2
+
+    let compared = call(Predicate, [a:value, a:list[middle]], dic)
+
+    if compared < 0
+      let end = middle - 1
+    elseif compared > 0
+      let start = middle + 1
+    else
+      return middle
+    endif
+  endwhile
+endfunction
+
+function! s:product(lists) abort
+  let result = [[]]
+  for pool in a:lists
+    let tmp = []
+    for x in result
+      let tmp += map(copy(pool), 'x + [v:val]')
+    endfor
+    let result = tmp
+  endfor
+  return result
+endfunction
+
+function! s:permutations(list, ...) abort
+  if a:0 > 1
+    throw 'vital: Data.List: too many arguments'
+  endif
+  let r = a:0 == 1 ? a:1 : len(a:list)
+  if r > len(a:list)
+    return []
+  elseif r < 0
+    throw 'vital: Data.List: {r} must be non-negative integer'
+  endif
+  let n = len(a:list)
+  let result = []
+  for indices in s:product(map(range(r), 'range(n)'))
+    if len(s:uniq(indices)) == r
+      call add(result, map(indices, 'a:list[v:val]'))
+    endif
+  endfor
+  return result
+endfunction
+
+function! s:combinations(list, r) abort
+  if a:r > len(a:list)
+    return []
+  elseif a:r < 0
+    throw 'vital: Data:List: {r} must be non-negative integer'
+  endif
+  let n = len(a:list)
+  let result = []
+  for indices in s:permutations(range(n), a:r)
+    if s:sort(copy(indices), 'a:a - a:b') == indices
+      call add(result, map(indices, 'a:list[v:val]'))
+    endif
+  endfor
+  return result
+endfunction
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim:set et ts=2 sts=2 sw=2 tw=0:
+
+endif

autoload/vital/_crystal/Data/String.vim

@@ -0,0 +1,572 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+" Utilities for string.
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+function! s:_vital_loaded(V) abort
+  let s:V = a:V
+  let s:P = s:V.import('Prelude')
+  let s:L = s:V.import('Data.List')
+endfunction
+
+function! s:_vital_depends() abort
+  return ['Prelude', 'Data.List']
+endfunction
+
+" Substitute a:from => a:to by string.
+" To substitute by pattern, use substitute() instead.
+function! s:replace(str, from, to) abort
+  return s:_replace(a:str, a:from, a:to, 'g')
+endfunction
+
+" Substitute a:from => a:to only once.
+" cf. s:replace()
+function! s:replace_first(str, from, to) abort
+  return s:_replace(a:str, a:from, a:to, '')
+endfunction
+
+" implement of replace() and replace_first()
+function! s:_replace(str, from, to, flags) abort
+  return substitute(a:str, '\V'.escape(a:from, '\'), escape(a:to, '\'), a:flags)
+endfunction
+
+function! s:scan(str, pattern) abort
+  let list = []
+  call substitute(a:str, a:pattern, '\=add(list, submatch(0)) == [] ? "" : ""', 'g')
+  return list
+endfunction
+
+function! s:reverse(str) abort
+  return join(reverse(split(a:str, '.\zs')), '')
+endfunction
+
+function! s:starts_with(str, prefix) abort
+  return stridx(a:str, a:prefix) == 0
+endfunction
+
+function! s:ends_with(str, suffix) abort
+  let idx = strridx(a:str, a:suffix)
+  return 0 <= idx && idx + len(a:suffix) == len(a:str)
+endfunction
+
+function! s:common_head(strs) abort
+  if empty(a:strs)
+    return ''
+  endif
+  let len = len(a:strs)
+  if len == 1
+    return a:strs[0]
+  endif
+  let strs = len == 2 ? a:strs : sort(copy(a:strs))
+  let pat = substitute(strs[0], '.', '\="[" . escape(submatch(0), "^\\") . "]"', 'g')
+  return pat == '' ? '' : matchstr(strs[-1], '\C^\%[' . pat . ']')
+endfunction
+
+" Split to two elements of List. ([left, right])
+" e.g.: s:split3('neocomplcache', 'compl') returns ['neo', 'compl', 'cache']
+function! s:split_leftright(expr, pattern) abort
+  let [left, _, right] = s:split3(a:expr, a:pattern)
+  return [left, right]
+endfunction
+
+function! s:split3(expr, pattern) abort
+  let ERROR = ['', '', '']
+  if a:expr ==# '' || a:pattern ==# ''
+    return ERROR
+  endif
+  let begin = match(a:expr, a:pattern)
+  if begin is -1
+    return ERROR
+  endif
+  let end   = matchend(a:expr, a:pattern)
+  let left  = begin <=# 0 ? '' : a:expr[: begin - 1]
+  let right = a:expr[end :]
+  return [left, a:expr[begin : end-1], right]
+endfunction
+
+" Slices into strings determines the number of substrings.
+" e.g.: s:nsplit("neo compl cache", 2, '\s') returns ['neo', 'compl cache']
+function! s:nsplit(expr, n, ...) abort
+  let pattern = get(a:000, 0, '\s')
+  let keepempty = get(a:000, 1, 1)
+  let ret = []
+  let expr = a:expr
+  if a:n <= 1
+    return [expr]
+  endif
+  while 1
+    let pos = match(expr, pattern)
+    if pos == -1
+      if expr !~ pattern || keepempty
+        call add(ret, expr)
+      endif
+      break
+    elseif pos >= 0
+      let left = pos > 0 ? expr[:pos-1] : ''
+      if pos > 0 || keepempty
+        call add(ret, left)
+      endif
+      let ml = len(matchstr(expr, pattern))
+      if pos == 0 && ml == 0
+        let pos = 1
+      endif
+      let expr = expr[pos+ml :]
+    endif
+    if len(expr) == 0
+      break
+    endif
+    if len(ret) == a:n - 1
+      call add(ret, expr)
+      break
+    endif
+  endwhile
+  return ret
+endfunction
+
+" Returns the number of character in a:str.
+" NOTE: This returns proper value
+" even if a:str contains multibyte character(s).
+" s:strchars(str) {{{
+if exists('*strchars')
+  function! s:strchars(str) abort
+    return strchars(a:str)
+  endfunction
+else
+  function! s:strchars(str) abort
+    return strlen(substitute(copy(a:str), '.', 'x', 'g'))
+  endfunction
+endif "}}}
+
+" Returns the bool of contains any multibyte character in s:str
+function! s:contains_multibyte(str) abort "{{{
+  return strlen(a:str) != s:strchars(a:str)
+endfunction "}}}
+
+" Remove last character from a:str.
+" NOTE: This returns proper value
+" even if a:str contains multibyte character(s).
+function! s:chop(str) abort "{{{
+  return substitute(a:str, '.$', '', '')
+endfunction "}}}
+
+" Remove last \r,\n,\r\n from a:str.
+function! s:chomp(str) abort "{{{
+  return substitute(a:str, '\%(\r\n\|[\r\n]\)$', '', '')
+endfunction "}}}
+
+" wrap() and its internal functions
+" * _split_by_wcswidth_once()
+" * _split_by_wcswidth()
+" * _concat()
+" * wrap()
+"
+" NOTE _concat() is just a copy of Data.List.concat().
+" FIXME don't repeat yourself
+function! s:_split_by_wcswidth_once(body, x) abort
+  let fst = s:strwidthpart(a:body, a:x)
+  let snd = s:strwidthpart_reverse(a:body, s:wcswidth(a:body) - s:wcswidth(fst))
+  return [fst, snd]
+endfunction
+
+function! s:_split_by_wcswidth(body, x) abort
+  let memo = []
+  let body = a:body
+  while s:wcswidth(body) > a:x
+    let [tmp, body] = s:_split_by_wcswidth_once(body, a:x)
+    call add(memo, tmp)
+  endwhile
+  call add(memo, body)
+  return memo
+endfunction
+
+function! s:trim(str) abort
+  return matchstr(a:str,'^\s*\zs.\{-}\ze\s*$')
+endfunction
+
+function! s:trim_start(str) abort
+  return matchstr(a:str,'^\s*\zs.\{-}$')
+endfunction
+
+function! s:trim_end(str) abort
+  return matchstr(a:str,'^.\{-}\ze\s*$')
+endfunction
+
+function! s:wrap(str,...) abort
+  let _columns = a:0 > 0 ? a:1 : &columns
+  return s:L.concat(
+        \ map(split(a:str, '\r\n\|[\r\n]'), 's:_split_by_wcswidth(v:val, _columns - 1)'))
+endfunction
+
+function! s:nr2byte(nr) abort
+  if a:nr < 0x80
+    return nr2char(a:nr)
+  elseif a:nr < 0x800
+    return nr2char(a:nr/64+192).nr2char(a:nr%64+128)
+  else
+    return nr2char(a:nr/4096%16+224).nr2char(a:nr/64%64+128).nr2char(a:nr%64+128)
+  endif
+endfunction
+
+function! s:nr2enc_char(charcode) abort
+  if &encoding == 'utf-8'
+    return nr2char(a:charcode)
+  endif
+  let char = s:nr2byte(a:charcode)
+  if strlen(char) > 1
+    let char = strtrans(iconv(char, 'utf-8', &encoding))
+  endif
+  return char
+endfunction
+
+function! s:nr2hex(nr) abort
+  let n = a:nr
+  let r = ""
+  while n
+    let r = '0123456789ABCDEF'[n % 16] . r
+    let n = n / 16
+  endwhile
+  return r
+endfunction
+
+" If a ==# b, returns -1.
+" If a !=# b, returns first index of different character.
+function! s:diffidx(a, b) abort
+  return a:a ==# a:b ? -1 : strlen(s:common_head([a:a, a:b]))
+endfunction
+
+function! s:substitute_last(expr, pat, sub) abort
+  return substitute(a:expr, printf('.*\zs%s', a:pat), a:sub, '')
+endfunction
+
+function! s:dstring(expr) abort
+  let x = substitute(string(a:expr), "^'\\|'$", '', 'g')
+  let x = substitute(x, "''", "'", 'g')
+  return printf('"%s"', escape(x, '"'))
+endfunction
+
+function! s:lines(str) abort
+  return split(a:str, '\r\?\n')
+endfunction
+
+function! s:_pad_with_char(str, left, right, char) abort
+  return repeat(a:char, a:left). a:str. repeat(a:char, a:right)
+endfunction
+
+function! s:pad_left(str, width, ...) abort
+  let char = get(a:, 1, ' ')
+  if strdisplaywidth(char) != 1
+    throw "vital: Data.String: Can't use non-half-width characters for padding."
+  endif
+  let left = max([0, a:width - strdisplaywidth(a:str)])
+  return s:_pad_with_char(a:str, left, 0, char)
+endfunction
+
+function! s:pad_right(str, width, ...) abort
+  let char = get(a:, 1, ' ')
+  if strdisplaywidth(char) != 1
+    throw "vital: Data.String: Can't use non-half-width characters for padding."
+  endif
+  let right = max([0, a:width - strdisplaywidth(a:str)])
+  return s:_pad_with_char(a:str, 0, right, char)
+endfunction
+
+function! s:pad_both_sides(str, width, ...) abort
+  let char = get(a:, 1, ' ')
+  if strdisplaywidth(char) != 1
+    throw "vital: Data.String: Can't use non-half-width characters for padding."
+  endif
+  let space = max([0, a:width - strdisplaywidth(a:str)])
+  let left = space / 2
+  let right = space - left
+  return s:_pad_with_char(a:str, left, right, char)
+endfunction
+
+function! s:pad_between_letters(str, width, ...) abort
+  let char = get(a:, 1, ' ')
+  if strdisplaywidth(char) != 1
+    throw "vital: Data.String: Can't use non-half-width characters for padding."
+  endif
+  let letters = split(a:str, '\zs')
+  let each_width = a:width / len(letters)
+  let str = join(map(letters, 's:pad_both_sides(v:val, each_width, char)'), '')
+  if a:width - strdisplaywidth(str) > 0
+    return char. s:pad_both_sides(str, a:width - 1, char)
+  endif
+  return str
+endfunction
+
+function! s:justify_equal_spacing(str, width, ...) abort
+  let char = get(a:, 1, ' ')
+  if strdisplaywidth(char) != 1
+    throw "vital: Data.String: Can't use non-half-width characters for padding."
+  endif
+  let letters = split(a:str, '\zs')
+  let first_letter = letters[0]
+  " {width w/o the first letter} / {length w/o the first letter}
+  let each_width = (a:width - strdisplaywidth(first_letter)) / (len(letters) - 1)
+  let remainder = (a:width - strdisplaywidth(first_letter)) % (len(letters) - 1)
+  return first_letter. join(s:L.concat([
+\     map(letters[1:remainder], 's:pad_left(v:val, each_width + 1, char)'),
+\     map(letters[remainder + 1:], 's:pad_left(v:val, each_width, char)')
+\   ]), '')
+endfunction
+
+function! s:levenshtein_distance(str1, str2) abort
+  let letters1 = split(a:str1, '\zs')
+  let letters2 = split(a:str2, '\zs')
+  let length1 = len(letters1)
+  let length2 = len(letters2)
+  let distances = map(range(1, length1 + 1), 'map(range(1, length2 + 1), "0")')
+
+  for i1 in range(0, length1)
+    let distances[i1][0] = i1
+  endfor
+  for i2 in range(0, length2)
+    let distances[0][i2] = i2
+  endfor
+
+  for i1 in range(1, length1)
+    for i2 in range(1, length2)
+      let cost = (letters1[i1 - 1] ==# letters2[i2 - 1]) ? 0 : 1
+
+      let distances[i1][i2] = min([
+      \ distances[i1 - 1][i2    ] + 1,
+      \ distances[i1    ][i2 - 1] + 1,
+      \ distances[i1 - 1][i2 - 1] + cost,
+      \])
+    endfor
+  endfor
+
+  return distances[length1][length2]
+endfunction
+
+function! s:padding_by_displaywidth(expr, width, float) abort
+  let padding_char = ' '
+  let n = a:width - strdisplaywidth(a:expr)
+  if n <= 0
+    let n = 0
+  endif
+  if a:float < 0
+    return a:expr . repeat(padding_char, n)
+  elseif 0 < a:float
+    return repeat(padding_char, n) . a:expr
+  else
+    if n % 2 is 0
+      return repeat(padding_char, n / 2) . a:expr . repeat(padding_char, n / 2)
+    else
+      return repeat(padding_char, (n - 1) / 2) . a:expr . repeat(padding_char, (n - 1) / 2) . padding_char
+    endif
+  endif
+endfunction
+
+function! s:split_by_displaywidth(expr, width, float, is_wrap) abort
+  if a:width is 0
+    return ['']
+  endif
+
+  let lines = []
+
+  let cs = split(a:expr, '\zs')
+  let cs_index = 0
+
+  let text = ''
+  while cs_index < len(cs)
+    if cs[cs_index] is "\n"
+      let text = s:padding_by_displaywidth(text, a:width, a:float)
+      let lines += [text]
+      let text = ''
+    else
+      let w = strdisplaywidth(text . cs[cs_index])
+
+      if w < a:width
+        let text .= cs[cs_index]
+      elseif a:width < w
+        let text = s:padding_by_displaywidth(text, a:width, a:float)
+      else
+        let text .= cs[cs_index]
+      endif
+
+      if a:width <= w
+        let lines += [text]
+        let text = ''
+        if a:is_wrap
+          if a:width < w
+            if a:width < strdisplaywidth(cs[cs_index])
+              while get(cs, cs_index, "\n") isnot "\n"
+                let cs_index += 1
+              endwhile
+              continue
+            else
+              let text = cs[cs_index]
+            endif
+          endif
+        else
+          while get(cs, cs_index, "\n") isnot "\n"
+            let cs_index += 1
+          endwhile
+          continue
+        endif
+      endif
+
+    endif
+    let cs_index += 1
+  endwhile
+
+  if !empty(text)
+    let lines += [ s:padding_by_displaywidth(text, a:width, a:float) ]
+  endif
+
+  return lines
+endfunction
+
+function! s:hash(str) abort
+  if exists('*sha256')
+    return sha256(a:str)
+  else
+    " This gives up sha256ing but just adds up char with index.
+    let sum = 0
+    for i in range(len(a:str))
+      let sum += char2nr(a:str[i]) * (i + 1)
+    endfor
+
+    return printf('%x', sum)
+  endif
+endfunction
+
+function! s:truncate(str, width) abort
+  " Original function is from mattn.
+  " http://github.com/mattn/googlereader-vim/tree/master
+
+  if a:str =~# '^[\x00-\x7f]*$'
+    return len(a:str) < a:width ?
+          \ printf('%-'.a:width.'s', a:str) : strpart(a:str, 0, a:width)
+  endif
+
+  let ret = a:str
+  let width = s:wcswidth(a:str)
+  if width > a:width
+    let ret = s:strwidthpart(ret, a:width)
+    let width = s:wcswidth(ret)
+  endif
+
+  if width < a:width
+    let ret .= repeat(' ', a:width - width)
+  endif
+
+  return ret
+endfunction
+
+function! s:truncate_skipping(str, max, footer_width, separator) abort
+  let width = s:wcswidth(a:str)
+  if width <= a:max
+    let ret = a:str
+  else
+    let header_width = a:max - s:wcswidth(a:separator) - a:footer_width
+    let ret = s:strwidthpart(a:str, header_width) . a:separator
+          \ . s:strwidthpart_reverse(a:str, a:footer_width)
+  endif
+  return s:truncate(ret, a:max)
+endfunction
+
+function! s:strwidthpart(str, width) abort
+  if a:width <= 0
+    return ''
+  endif
+  let strarr = split(a:str, '\zs')
+  let width = s:wcswidth(a:str)
+  let index = len(strarr)
+  let diff = (index + 1) / 2
+  let rightindex = index - 1
+  while width > a:width
+    let index = max([rightindex - diff + 1, 0])
+    let partwidth = s:wcswidth(join(strarr[(index):(rightindex)], ''))
+    if width - partwidth >= a:width || diff <= 1
+      let width -= partwidth
+      let rightindex = index - 1
+    endif
+    if diff > 1
+      let diff = diff / 2
+    endif
+  endwhile
+  return index ? join(strarr[:index - 1], '') : ''
+endfunction
+
+function! s:strwidthpart_reverse(str, width) abort
+  if a:width <= 0
+    return ''
+  endif
+  let strarr = split(a:str, '\zs')
+  let width = s:wcswidth(a:str)
+  let strlen = len(strarr)
+  let diff = (strlen + 1) / 2
+  let leftindex = 0
+  let index = -1
+  while width > a:width
+    let index = min([leftindex + diff, strlen]) - 1
+    let partwidth = s:wcswidth(join(strarr[(leftindex):(index)], ''))
+    if width - partwidth >= a:width || diff <= 1
+      let width -= partwidth
+      let leftindex = index + 1
+    endif
+    if diff > 1
+      let diff = diff / 2
+    endif
+  endwhile
+  return index < strlen ? join(strarr[(index + 1):], '') : ''
+endfunction
+
+if v:version >= 703
+  " Use builtin function.
+  function! s:wcswidth(str) abort
+    return strwidth(a:str)
+  endfunction
+else
+  function! s:wcswidth(str) abort
+    if a:str =~# '^[\x00-\x7f]*$'
+      return strlen(a:str)
+    endif
+    let mx_first = '^\(.\)'
+    let str = a:str
+    let width = 0
+    while 1
+      let ucs = char2nr(substitute(str, mx_first, '\1', ''))
+      if ucs == 0
+        break
+      endif
+      let width += s:_wcwidth(ucs)
+      let str = substitute(str, mx_first, '', '')
+    endwhile
+    return width
+  endfunction
+
+  " UTF-8 only.
+  function! s:_wcwidth(ucs) abort
+    let ucs = a:ucs
+    if (ucs >= 0x1100
+          \  && (ucs <= 0x115f
+          \  || ucs == 0x2329
+          \  || ucs == 0x232a
+          \  || (ucs >= 0x2e80 && ucs <= 0xa4cf
+          \      && ucs != 0x303f)
+          \  || (ucs >= 0xac00 && ucs <= 0xd7a3)
+          \  || (ucs >= 0xf900 && ucs <= 0xfaff)
+          \  || (ucs >= 0xfe30 && ucs <= 0xfe6f)
+          \  || (ucs >= 0xff00 && ucs <= 0xff60)
+          \  || (ucs >= 0xffe0 && ucs <= 0xffe6)
+          \  || (ucs >= 0x20000 && ucs <= 0x2fffd)
+          \  || (ucs >= 0x30000 && ucs <= 0x3fffd)
+          \  ))
+      return 2
+    endif
+    return 1
+  endfunction
+endif
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim:set et ts=2 sts=2 sw=2 tw=0:
+
+endif

autoload/vital/_crystal/Prelude.vim

@@ -0,0 +1,389 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+let s:save_cpo = &cpo
+set cpo&vim
+
+if v:version ># 703 ||
+\  (v:version is 703 && has('patch465'))
+  function! s:glob(expr) abort
+    return glob(a:expr, 1, 1)
+  endfunction
+else
+  function! s:glob(expr) abort
+    let R = glob(a:expr, 1)
+    return split(R, '\n')
+  endfunction
+endif
+
+function! s:globpath(path, expr) abort
+  let R = globpath(a:path, a:expr, 1)
+  return split(R, '\n')
+endfunction
+
+" Wrapper functions for type().
+let [
+\   s:__TYPE_NUMBER,
+\   s:__TYPE_STRING,
+\   s:__TYPE_FUNCREF,
+\   s:__TYPE_LIST,
+\   s:__TYPE_DICT,
+\   s:__TYPE_FLOAT] = [
+      \   type(3),
+      \   type(""),
+      \   type(function('tr')),
+      \   type([]),
+      \   type({}),
+      \   has('float') ? type(str2float('0')) : -1]
+" __TYPE_FLOAT = -1 when -float
+" This doesn't match to anything.
+
+" Number or Float
+function! s:is_numeric(Value) abort
+  let _ = type(a:Value)
+  return _ ==# s:__TYPE_NUMBER
+  \   || _ ==# s:__TYPE_FLOAT
+endfunction
+
+" Number
+function! s:is_number(Value) abort
+  return type(a:Value) ==# s:__TYPE_NUMBER
+endfunction
+
+" Float
+function! s:is_float(Value) abort
+  return type(a:Value) ==# s:__TYPE_FLOAT
+endfunction
+" String
+function! s:is_string(Value) abort
+  return type(a:Value) ==# s:__TYPE_STRING
+endfunction
+" Funcref
+function! s:is_funcref(Value) abort
+  return type(a:Value) ==# s:__TYPE_FUNCREF
+endfunction
+" List
+function! s:is_list(Value) abort
+  return type(a:Value) ==# s:__TYPE_LIST
+endfunction
+" Dictionary
+function! s:is_dict(Value) abort
+  return type(a:Value) ==# s:__TYPE_DICT
+endfunction
+
+function! s:truncate_skipping(str, max, footer_width, separator) abort
+  call s:_warn_deprecated("truncate_skipping", "Data.String.truncate_skipping")
+
+  let width = s:wcswidth(a:str)
+  if width <= a:max
+    let ret = a:str
+  else
+    let header_width = a:max - s:wcswidth(a:separator) - a:footer_width
+    let ret = s:strwidthpart(a:str, header_width) . a:separator
+          \ . s:strwidthpart_reverse(a:str, a:footer_width)
+  endif
+
+  return s:truncate(ret, a:max)
+endfunction
+
+function! s:truncate(str, width) abort
+  " Original function is from mattn.
+  " http://github.com/mattn/googlereader-vim/tree/master
+
+  call s:_warn_deprecated("truncate", "Data.String.truncate")
+
+  if a:str =~# '^[\x00-\x7f]*$'
+    return len(a:str) < a:width ?
+          \ printf('%-'.a:width.'s', a:str) : strpart(a:str, 0, a:width)
+  endif
+
+  let ret = a:str
+  let width = s:wcswidth(a:str)
+  if width > a:width
+    let ret = s:strwidthpart(ret, a:width)
+    let width = s:wcswidth(ret)
+  endif
+
+  if width < a:width
+    let ret .= repeat(' ', a:width - width)
+  endif
+
+  return ret
+endfunction
+
+function! s:strwidthpart(str, width) abort
+  call s:_warn_deprecated("strwidthpart", "Data.String.strwidthpart")
+
+  if a:width <= 0
+    return ''
+  endif
+  let ret = a:str
+  let width = s:wcswidth(a:str)
+  while width > a:width
+    let char = matchstr(ret, '.$')
+    let ret = ret[: -1 - len(char)]
+    let width -= s:wcswidth(char)
+  endwhile
+
+  return ret
+endfunction
+function! s:strwidthpart_reverse(str, width) abort
+  call s:_warn_deprecated("strwidthpart_reverse", "Data.String.strwidthpart_reverse")
+
+  if a:width <= 0
+    return ''
+  endif
+  let ret = a:str
+  let width = s:wcswidth(a:str)
+  while width > a:width
+    let char = matchstr(ret, '^.')
+    let ret = ret[len(char) :]
+    let width -= s:wcswidth(char)
+  endwhile
+
+  return ret
+endfunction
+
+if v:version >= 703
+  " Use builtin function.
+  function! s:wcswidth(str) abort
+    call s:_warn_deprecated("wcswidth", "Data.String.wcswidth")
+    return strwidth(a:str)
+  endfunction
+else
+  function! s:wcswidth(str) abort
+    call s:_warn_deprecated("wcswidth", "Data.String.wcswidth")
+
+    if a:str =~# '^[\x00-\x7f]*$'
+      return strlen(a:str)
+    end
+
+    let mx_first = '^\(.\)'
+    let str = a:str
+    let width = 0
+    while 1
+      let ucs = char2nr(substitute(str, mx_first, '\1', ''))
+      if ucs == 0
+        break
+      endif
+      let width += s:_wcwidth(ucs)
+      let str = substitute(str, mx_first, '', '')
+    endwhile
+    return width
+  endfunction
+
+  " UTF-8 only.
+  function! s:_wcwidth(ucs) abort
+    let ucs = a:ucs
+    if (ucs >= 0x1100
+          \  && (ucs <= 0x115f
+          \  || ucs == 0x2329
+          \  || ucs == 0x232a
+          \  || (ucs >= 0x2e80 && ucs <= 0xa4cf
+          \      && ucs != 0x303f)
+          \  || (ucs >= 0xac00 && ucs <= 0xd7a3)
+          \  || (ucs >= 0xf900 && ucs <= 0xfaff)
+          \  || (ucs >= 0xfe30 && ucs <= 0xfe6f)
+          \  || (ucs >= 0xff00 && ucs <= 0xff60)
+          \  || (ucs >= 0xffe0 && ucs <= 0xffe6)
+          \  || (ucs >= 0x20000 && ucs <= 0x2fffd)
+          \  || (ucs >= 0x30000 && ucs <= 0x3fffd)
+          \  ))
+      return 2
+    endif
+    return 1
+  endfunction
+endif
+
+let s:is_windows = has('win16') || has('win32') || has('win64') || has('win95')
+let s:is_cygwin = has('win32unix')
+let s:is_mac = !s:is_windows && !s:is_cygwin
+      \ && (has('mac') || has('macunix') || has('gui_macvim') ||
+      \   (!isdirectory('/proc') && executable('sw_vers')))
+let s:is_unix = has('unix')
+
+function! s:is_windows() abort
+  return s:is_windows
+endfunction
+
+function! s:is_cygwin() abort
+  return s:is_cygwin
+endfunction
+
+function! s:is_mac() abort
+  return s:is_mac
+endfunction
+
+function! s:is_unix() abort
+  return s:is_unix
+endfunction
+
+function! s:_warn_deprecated(name, alternative) abort
+  try
+    echohl Error
+    echomsg "Prelude." . a:name . " is deprecated!  Please use " . a:alternative . " instead."
+  finally
+    echohl None
+  endtry
+endfunction
+
+function! s:smart_execute_command(action, word) abort
+  execute a:action . ' ' . (a:word == '' ? '' : '`=a:word`')
+endfunction
+
+function! s:escape_file_searching(buffer_name) abort
+  return escape(a:buffer_name, '*[]?{}, ')
+endfunction
+
+function! s:escape_pattern(str) abort
+  return escape(a:str, '~"\.^$[]*')
+endfunction
+
+function! s:getchar(...) abort
+  let c = call('getchar', a:000)
+  return type(c) == type(0) ? nr2char(c) : c
+endfunction
+
+function! s:getchar_safe(...) abort
+  let c = s:input_helper('getchar', a:000)
+  return type(c) == type("") ? c : nr2char(c)
+endfunction
+
+function! s:input_safe(...) abort
+  return s:input_helper('input', a:000)
+endfunction
+
+function! s:input_helper(funcname, args) abort
+  let success = 0
+  if inputsave() !=# success
+    throw 'vital: Prelude: inputsave() failed'
+  endif
+  try
+    return call(a:funcname, a:args)
+  finally
+    if inputrestore() !=# success
+      throw 'vital: Prelude: inputrestore() failed'
+    endif
+  endtry
+endfunction
+
+function! s:set_default(var, val) abort
+  if !exists(a:var) || type({a:var}) != type(a:val)
+    let {a:var} = a:val
+  endif
+endfunction
+
+function! s:substitute_path_separator(path) abort
+  return s:is_windows ? substitute(a:path, '\\', '/', 'g') : a:path
+endfunction
+
+function! s:path2directory(path) abort
+  return s:substitute_path_separator(isdirectory(a:path) ? a:path : fnamemodify(a:path, ':p:h'))
+endfunction
+
+function! s:_path2project_directory_git(path) abort
+  let parent = a:path
+
+  while 1
+    let path = parent . '/.git'
+    if isdirectory(path) || filereadable(path)
+      return parent
+    endif
+    let next = fnamemodify(parent, ':h')
+    if next == parent
+      return ''
+    endif
+    let parent = next
+  endwhile
+endfunction
+
+function! s:_path2project_directory_svn(path) abort
+  let search_directory = a:path
+  let directory = ''
+
+  let find_directory = s:escape_file_searching(search_directory)
+  let d = finddir('.svn', find_directory . ';')
+  if d == ''
+    return ''
+  endif
+
+  let directory = fnamemodify(d, ':p:h:h')
+
+  " Search parent directories.
+  let parent_directory = s:path2directory(
+        \ fnamemodify(directory, ':h'))
+
+  if parent_directory != ''
+    let d = finddir('.svn', parent_directory . ';')
+    if d != ''
+      let directory = s:_path2project_directory_svn(parent_directory)
+    endif
+  endif
+  return directory
+endfunction
+
+function! s:_path2project_directory_others(vcs, path) abort
+  let vcs = a:vcs
+  let search_directory = a:path
+
+  let find_directory = s:escape_file_searching(search_directory)
+  let d = finddir(vcs, find_directory . ';')
+  if d == ''
+    return ''
+  endif
+  return fnamemodify(d, ':p:h:h')
+endfunction
+
+function! s:path2project_directory(path, ...) abort
+  let is_allow_empty = get(a:000, 0, 0)
+  let search_directory = s:path2directory(a:path)
+  let directory = ''
+
+  " Search VCS directory.
+  for vcs in ['.git', '.bzr', '.hg', '.svn']
+    if vcs ==# '.git'
+      let directory = s:_path2project_directory_git(search_directory)
+    elseif vcs ==# '.svn'
+      let directory = s:_path2project_directory_svn(search_directory)
+    else
+      let directory = s:_path2project_directory_others(vcs, search_directory)
+    endif
+    if directory != ''
+      break
+    endif
+  endfor
+
+  " Search project file.
+  if directory == ''
+    for d in ['build.xml', 'prj.el', '.project', 'pom.xml', 'package.json',
+          \ 'Makefile', 'configure', 'Rakefile', 'NAnt.build',
+          \ 'P4CONFIG', 'tags', 'gtags']
+      let d = findfile(d, s:escape_file_searching(search_directory) . ';')
+      if d != ''
+        let directory = fnamemodify(d, ':p:h')
+        break
+      endif
+    endfor
+  endif
+
+  if directory == ''
+    " Search /src/ directory.
+    let base = s:substitute_path_separator(search_directory)
+    if base =~# '/src/'
+      let directory = base[: strridx(base, '/src/') + 3]
+    endif
+  endif
+
+  if directory == '' && !is_allow_empty
+    " Use original path.
+    let directory = search_directory
+  endif
+
+  return s:substitute_path_separator(directory)
+endfunction
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim:set et ts=2 sts=2 sw=2 tw=0:
+
+endif

autoload/vital/_crystal/Process.vim

@@ -0,0 +1,185 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+" TODO: move all comments to doc file.
+"
+"
+" FIXME: This module name should be Vital.System ?
+" But the name has been already taken.
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+
+" FIXME: Unfortunately, can't use s:_vital_loaded() for this purpose.
+" Because these variables are used when this script file is loaded.
+let s:is_windows = has('win16') || has('win32') || has('win64') || has('win95')
+let s:is_unix = has('unix')
+" As of 7.4.122, the system()'s 1st argument is converted internally by Vim.
+" Note that Patch 7.4.122 does not convert system()'s 2nd argument and
+" return-value. We must convert them manually.
+let s:need_trans = v:version < 704 || (v:version == 704 && !has('patch122'))
+
+let s:TYPE_DICT = type({})
+let s:TYPE_LIST = type([])
+let s:TYPE_STRING = type("")
+
+
+" Execute program in the background from Vim.
+" Return an empty string always.
+"
+" If a:expr is a List, shellescape() each argument.
+" If a:expr is a String, the arguments are passed as-is.
+"
+" Windows:
+" Using :!start , execute program without via cmd.exe.
+" Spawning 'expr' with 'noshellslash'
+" keep special characters from unwanted expansion.
+" (see :help shellescape())
+"
+" Unix:
+" using :! , execute program in the background by shell.
+function! s:spawn(expr, ...) abort
+  let shellslash = 0
+  if s:is_windows
+    let shellslash = &l:shellslash
+    setlocal noshellslash
+  endif
+  try
+    if type(a:expr) is s:TYPE_LIST
+      let special = 1
+      let cmdline = join(map(a:expr, 'shellescape(v:val, special)'), ' ')
+    elseif type(a:expr) is s:TYPE_STRING
+      let cmdline = a:expr
+      if a:0 && a:1
+        " for :! command
+        let cmdline = substitute(cmdline, '\([!%#]\|<[^<>]\+>\)', '\\\1', 'g')
+      endif
+    else
+      throw 'Process.spawn(): invalid argument (value type:'.type(a:expr).')'
+    endif
+    if s:is_windows
+      silent execute '!start' cmdline
+    else
+      silent execute '!' cmdline '&'
+    endif
+  finally
+    if s:is_windows
+      let &l:shellslash = shellslash
+    endif
+  endtry
+  return ''
+endfunction
+
+" iconv() wrapper for safety.
+function! s:iconv(expr, from, to) abort
+  if a:from == '' || a:to == '' || a:from ==? a:to
+    return a:expr
+  endif
+  let result = iconv(a:expr, a:from, a:to)
+  return result != '' ? result : a:expr
+endfunction
+
+" Check vimproc.
+function! s:has_vimproc() abort
+  if !exists('s:exists_vimproc')
+    try
+      call vimproc#version()
+      let s:exists_vimproc = 1
+    catch
+      let s:exists_vimproc = 0
+    endtry
+  endif
+  return s:exists_vimproc
+endfunction
+
+" * {command} [, {input} [, {timeout}]]
+" * {command} [, {dict}]
+"   {dict} = {
+"     use_vimproc: bool,
+"     input: string,
+"     timeout: bool,
+"     background: bool,
+"   }
+function! s:system(str, ...) abort
+  " Process optional arguments at first
+  " because use_vimproc is required later
+  " for a:str argument.
+  let input = ''
+  let use_vimproc = s:has_vimproc()
+  let background = 0
+  let args = []
+  if a:0 ==# 1
+    " {command} [, {dict}]
+    " a:1 = {dict}
+    if type(a:1) is s:TYPE_DICT
+      if has_key(a:1, 'use_vimproc')
+        let use_vimproc = a:1.use_vimproc
+      endif
+      if has_key(a:1, 'input')
+        let args += [s:iconv(a:1.input, &encoding, 'char')]
+      endif
+      if use_vimproc && has_key(a:1, 'timeout')
+        " ignores timeout unless you have vimproc.
+        let args += [a:1.timeout]
+      endif
+      if has_key(a:1, 'background')
+        let background = a:1.background
+      endif
+    elseif type(a:1) is s:TYPE_STRING
+      let args += [s:iconv(a:1, &encoding, 'char')]
+    else
+      throw 'Process.system(): invalid argument (value type:'.type(a:1).')'
+    endif
+  elseif a:0 >= 2
+    " {command} [, {input} [, {timeout}]]
+    " a:000 = [{input} [, {timeout}]]
+    let [input; rest] = a:000
+    let input   = s:iconv(input, &encoding, 'char')
+    let args += [input] + rest
+  endif
+
+  " Process a:str argument.
+  if type(a:str) is s:TYPE_LIST
+    let expr = use_vimproc ? '"''" . v:val . "''"' : 's:shellescape(v:val)'
+    let command = join(map(copy(a:str), expr), ' ')
+  elseif type(a:str) is s:TYPE_STRING
+    let command = a:str
+  else
+    throw 'Process.system(): invalid argument (value type:'.type(a:str).')'
+  endif
+  if s:need_trans
+    let command = s:iconv(command, &encoding, 'char')
+  endif
+  let args = [command] + args
+  if background && (use_vimproc || !s:is_windows)
+    let args[0] = args[0] . ' &'
+  endif
+
+  let funcname = use_vimproc ? 'vimproc#system' : 'system'
+  let output = call(funcname, args)
+  let output = s:iconv(output, 'char', &encoding)
+  return output
+endfunction
+
+function! s:get_last_status() abort
+  return s:has_vimproc() ?
+        \ vimproc#get_last_status() : v:shell_error
+endfunction
+
+if s:is_windows
+  function! s:shellescape(command) abort
+    return substitute(a:command, '[&()[\]{}^=;!''+,`~]', '^\0', 'g')
+  endfunction
+else
+  function! s:shellescape(...) abort
+    return call('shellescape', a:000)
+  endfunction
+endif
+
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim:set et ts=2 sts=2 sw=2 tw=0:
+
+endif

autoload/vital/_crystal/Web/JSON.vim

@@ -0,0 +1,112 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+let s:save_cpo = &cpo
+set cpo&vim
+
+function! s:_true() abort
+  return 1
+endfunction
+
+function! s:_false() abort
+  return 0
+endfunction
+
+function! s:_null() abort
+  return 0
+endfunction
+
+let s:const = {}
+let s:const.true = function('s:_true')
+let s:const.false = function('s:_false')
+let s:const.null = function('s:_null')
+
+function! s:_resolve(val, prefix) abort
+  let t = type(a:val)
+  if t == type('')
+    let m = matchlist(a:val, '^' . a:prefix . '\(null\|true\|false\)$')
+    if !empty(m)
+      return s:const[m[1]]
+    endif
+  elseif t == type([]) || t == type({})
+    return map(a:val, 's:_resolve(v:val, a:prefix)')
+  endif
+  return a:val
+endfunction
+
+
+function! s:_vital_created(module) abort
+  " define constant variables
+  call extend(a:module, s:const)
+endfunction
+
+function! s:_vital_loaded(V) abort
+  let s:V = a:V
+  let s:string = s:V.import('Data.String')
+endfunction
+
+function! s:_vital_depends() abort
+  return ['Data.String']
+endfunction
+
+" @vimlint(EVL102, 1, l:null)
+" @vimlint(EVL102, 1, l:true)
+" @vimlint(EVL102, 1, l:false)
+function! s:decode(json, ...) abort
+  let settings = extend({
+        \ 'use_token': 0,
+        \}, get(a:000, 0, {}))
+  let json = iconv(a:json, "utf-8", &encoding)
+  let json = join(split(json, "\n"), '')
+  let json = substitute(json, '\\u34;', '\\"', 'g')
+  let json = substitute(json, '\\u\(\x\x\x\x\)', '\=s:string.nr2enc_char("0x".submatch(1))', 'g')
+  if settings.use_token
+    let prefix = '__Web.JSON__'
+    while stridx(json, prefix) != -1
+      let prefix .= '_'
+    endwhile
+    let [null,true,false] = map(['null','true','false'], 'prefix . v:val')
+    sandbox return s:_resolve(eval(json), prefix)
+  else
+    let [null,true,false] = [s:const.null(),s:const.true(),s:const.false()]
+    sandbox return eval(json)
+  endif
+endfunction
+" @vimlint(EVL102, 0, l:null)
+" @vimlint(EVL102, 0, l:true)
+" @vimlint(EVL102, 0, l:false)
+
+function! s:encode(val) abort
+  if type(a:val) == 0
+    return a:val
+  elseif type(a:val) == 1
+    let json = '"' . escape(a:val, '\"') . '"'
+    let json = substitute(json, "\r", '\\r', 'g')
+    let json = substitute(json, "\n", '\\n', 'g')
+    let json = substitute(json, "\t", '\\t', 'g')
+    return iconv(json, &encoding, "utf-8")
+  elseif type(a:val) == 2
+    if s:const.true == a:val
+      return 'true'
+    elseif s:const.false == a:val
+      return 'false'
+    elseif s:const.null == a:val
+      return 'null'
+    else
+      " backward compatibility
+      return string(a:val)
+    endif
+  elseif type(a:val) == 3
+    return '[' . join(map(copy(a:val), 's:encode(v:val)'), ',') . ']'
+  elseif type(a:val) == 4
+    return '{' . join(map(keys(a:val), 's:encode(v:val).":".s:encode(a:val[v:val])'), ',') . '}'
+  else
+    return string(a:val)
+  endif
+endfunction
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim:set et ts=2 sts=2 sw=2 tw=0:
+
+endif

build

@@ -105,6 +105,7 @@ PACKS="
   clojure:guns/vim-clojure-static
   coffee-script:kchmck/vim-coffee-script
   cryptol:victoredwardocallaghan/cryptol.vim
+  crystal:rhysd/vim-crystal
   cql:elubow/cql-vim
   css:JulesWang/css.vim
   cucumber:tpope/vim-cucumber

ftdetect/polyglot.vim

@@ -60,6 +60,12 @@ au! BufRead,BufNewFile *.cyl set filetype=cryptol
 au! BufRead,BufNewFile *.lcry set filetype=cryptol
 au! BufRead,BufNewFile *.lcyl set filetype=cryptol
 endif
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+autocmd BufNewFile,BufReadPost *.cr setlocal filetype=crystal
+autocmd BufNewFile,BufReadPost Projectfile setlocal filetype=crystal
+autocmd BufNewFile,BufReadPost *.ecr setlocal filetype=eruby
+endif
 if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'cucumber') == -1
   
 autocmd BufNewFile,BufReadPost *.feature,*.story set filetype=cucumber

ftplugin/crystal.vim

@@ -0,0 +1,60 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+if exists('b:did_ftplugin')
+  finish
+endif
+let b:did_ftplugin = 1
+
+let s:save_cpo = &cpo
+set cpo&vim
+
+if exists('loaded_matchit') && !exists('b:match_words')
+  let b:match_ignorecase = 0
+
+  let b:match_words =
+        \ '\<\%(if\|unless\|case\|while\|until\|for\|do\|class\|module\|struct\|lib\|macro\|ifdef\|def\|fun\|begin\)\>=\@!' .
+        \ ':' .
+        \ '\<\%(else\|elsif\|ensure\|when\|rescue\|break\|redo\|next\|retry\)\>' .
+        \ ':' .
+        \ '\<end\>' .
+        \ ',{:},\[:\],(:)'
+
+  let b:match_skip =
+        \ "synIDattr(synID(line('.'),col('.'),0),'name') =~ '" .
+        \ "\\<crystal\\%(String\\|StringDelimiter\\|ASCIICode\\|Escape\\|" .
+        \ "Interpolation\\|NoInterpolation\\|Comment\\|Documentation\\|" .
+        \ "ConditionalModifier\\|RepeatModifier\\|OptionalDo\\|" .
+        \ "Function\\|BlockArgument\\|KeywordAsMethod\\|ClassVariable\\|" .
+        \ "InstanceVariable\\|GlobalVariable\\|Symbol\\)\\>'"
+endif
+
+setlocal comments=:#
+setlocal commentstring=#\ %s
+setlocal suffixesadd=.cr
+
+" Set format for quickfix window
+setlocal errorformat=
+  \%ESyntax\ error\ in\ line\ %l:\ %m,
+  \%ESyntax\ error\ in\ %f:%l:\ %m,
+  \%EError\ in\ %f:%l:\ %m,
+  \%C%p^,
+  \%-C%.%#
+
+if get(g:, 'crystal_define_mappings', 1)
+  nmap <buffer>gd <Plug>(crystal-jump-to-definition)
+  nmap <buffer>gc <Plug>(crystal-show-context)
+  nmap <buffer>gss <Plug>(crystal-spec-switch)
+  nmap <buffer>gsa <Plug>(crystal-spec-run-all)
+  nmap <buffer>gsc <Plug>(crystal-spec-run-current)
+endif
+
+if &l:ofu ==# ''
+  setlocal omnifunc=crystal_lang#complete
+endif
+
+let &cpo = s:save_cpo
+unlet s:save_cpo
+
+" vim: nowrap sw=2 sts=2 ts=8:
+
+endif

indent/crystal.vim

@@ -0,0 +1,639 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+" Only load this indent file when no other was loaded.
+if exists('b:did_indent')
+  finish
+endif
+let b:did_indent = 1
+
+if !exists('g:crystal_indent_access_modifier_style')
+  " Possible values: "normal", "indent", "outdent"
+  let g:crystal_indent_access_modifier_style = 'normal'
+endif
+
+setlocal nosmartindent
+
+" Now, set up our indentation expression and keys that trigger it.
+setlocal indentexpr=GetCrystalIndent(v:lnum)
+setlocal indentkeys=0{,0},0),0],!^F,o,O,e,:,.
+setlocal indentkeys+==end,=else,=elsif,=when,=ensure,=rescue,==begin,==end
+setlocal indentkeys+==private,=protected,=public
+
+" Only define the function once.
+if exists('*GetCrystalIndent')
+  finish
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+" 1. Variables {{{1
+" ============
+
+" Regex of syntax group names that are or delimit strings/symbols or are comments.
+let s:syng_strcom = '\<crystal\%(Regexp\|RegexpDelimiter\|RegexpEscape' .
+      \ '\|Symbol\|String\|StringDelimiter\|StringEscape\|ASCIICode' .
+      \ '\|Interpolation\|InterpolationDelimiter\|NoInterpolation\|Comment\|Documentation\)\>'
+
+" Regex of syntax group names that are strings.
+let s:syng_string =
+      \ '\<crystal\%(String\|Interpolation\|NoInterpolation\|StringEscape\)\>'
+
+" Regex of syntax group names that are strings or documentation.
+let s:syng_stringdoc =
+      \'\<crystal\%(String\|Interpolation\|NoInterpolation\|StringEscape\|Documentation\)\>'
+
+" Expression used to check whether we should skip a match with searchpair().
+let s:skip_expr =
+      \ "synIDattr(synID(line('.'),col('.'),1),'name') =~ '".s:syng_strcom."'"
+
+" Regex used for words that, at the start of a line, add a level of indent.
+let s:crystal_indent_keywords =
+      \ '^\s*\zs\<\%(module\|\%(abstract\)\=\s*\%(class\|struct\)\|enum\|if\|for\|macro' .
+      \ '\|while\|until\|else\|elsif\|case\|when\|unless\|begin\|ensure\|rescue\|lib' .
+      \ '\|\%(protected\|private\)\=\s*def\):\@!\>' .
+      \ '\|\%([=,*/%+-]\|<<\|>>\|:\s\)\s*\zs' .
+      \ '\<\%(if\|for\|while\|until\|case\|unless\|begin\):\@!\>' .
+      \ '\|{%\s*\<\%(if\|for\|while\|until\|lib\|case\|unless\|begin\|else\|elsif\|when\)'
+
+" Regex used for words that, at the start of a line, remove a level of indent.
+let s:crystal_deindent_keywords =
+      \ '^\s*\zs\<\%(ensure\|else\|rescue\|elsif\|when\|end\):\@!\>' .
+      \ '\|{%\s*\<\%(ensure\|else\|rescue\|elsif\|when\|end\)\>'
+
+" Regex that defines the start-match for the 'end' keyword.
+" TODO: the do here should be restricted somewhat (only at end of line)?
+let s:end_start_regex =
+      \ '{%\s*\<\%(if\|for\|while\|until\|unless\|begin\|lib\)\>\|' .
+      \ '\C\%(^\s*\|[=,*/%+\-|;{]\|<<\|>>\|:\s\)\s*\zs' .
+      \ '\<\%(module\|\%(abstract\)\=\s*\%(class\|struct\)\|enum\|macro\|if\|for\|while\|until\|case\|unless\|begin\|lib' .
+      \ '\|\%(protected\|private\)\=\s*def\):\@!\>' .
+      \ '\|\%(^\|[^.:@$]\)\@<=\<do:\@!\>'
+
+" Regex that defines the middle-match for the 'end' keyword.
+let s:end_middle_regex =
+      \ '{%\s*\<\%(ensure\|else\|when\|elsif\)\>\s*%}\|' .
+      \ '\<\%(ensure\|else\|\%(\%(^\|;\)\s*\)\@<=\<rescue:\@!\>\|when\|elsif\):\@!\>'
+
+" Regex that defines the end-match for the 'end' keyword.
+let s:end_end_regex = '\%(^\|[^.:@$]\)\@<=\<end:\@!\>\|{%\s*\<\%(end\)\>'
+
+" Expression used for searchpair() call for finding match for 'end' keyword.
+let s:end_skip_expr = s:skip_expr .
+      \ ' || (expand("<cword>") == "do"' .
+      \ ' && getline(".") =~ "^\\s*\\<\\(while\\|until\\|for\\):\\@!\\>")'
+
+" Regex that defines continuation lines, not including (, {, or [.
+let s:non_bracket_continuation_regex = '\%([\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
+
+" Regex that defines continuation lines.
+let s:continuation_regex =
+      \ '\%(%\@<![({[\\.,:*/%+]\|\<and\|\<or\|\%(<%\)\@<![=-]\|\W[|&?]\|||\|&&\)\s*\%(#.*\)\=$'
+
+" Regex that defines continuable keywords
+let s:continuable_regex =
+      \ '\C\%(^\s*\|[=,*/%+\-|;{]\|<<\|>>\|:\s\)\s*\zs' .
+      \ '\<\%(if\|for\|while\|until\|unless\):\@!\>'
+
+" Regex that defines bracket continuations
+let s:bracket_continuation_regex = '%\@<!\%([({[]\)\s*\%(#.*\)\=$'
+
+" Regex that defines end of bracket continuation followed by another continuation
+let s:bracket_switch_continuation_regex = '^\([^(]\+\zs).\+\)\+'.s:continuation_regex
+
+" Regex that defines the first part of a splat pattern
+let s:splat_regex = '[[,(]\s*\*\s*\%(#.*\)\=$'
+
+" Regex that defines blocks.
+"
+" Note that there's a slight problem with this regex and s:continuation_regex.
+" Code like this will be matched by both:
+"
+"   method_call do |(a, b)|
+"
+" The reason is that the pipe matches a hanging "|" operator.
+"
+let s:block_regex =
+      \ '\%(\<do:\@!\>\|%\@<!{\)\s*\%(|\s*(*\s*\%([*@&]\=\h\w*,\=\s*\)\%(,\s*(*\s*[*@&]\=\h\w*\s*)*\s*\)*|\)\=\s*\%(#.*\)\=$'
+
+let s:block_continuation_regex = '^\s*[^])}\t ].*'.s:block_regex
+
+" Regex that describes a leading operator (only a method call's dot for now)
+let s:leading_operator_regex = '^\s*[.]'
+
+" Regex that describes all indent access modifiers
+let s:access_modifier_regex = '\C^\s*\%(public\|protected\|private\)\s*\%(#.*\)\=$'
+
+" 2. Auxiliary Functions {{{1
+" ======================
+
+" Check if the character at lnum:col is inside a string, comment, or is ascii.
+function s:IsInStringOrComment(lnum, col)
+  return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_strcom
+endfunction
+
+" Check if the character at lnum:col is inside a string.
+function s:IsInString(lnum, col)
+  return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_string
+endfunction
+
+" Check if the character at lnum:col is inside a string or documentation.
+function s:IsInStringOrDocumentation(lnum, col)
+  return synIDattr(synID(a:lnum, a:col, 1), 'name') =~ s:syng_stringdoc
+endfunction
+
+" Check if the character at lnum:col is inside a string delimiter
+function s:IsInStringDelimiter(lnum, col)
+  return synIDattr(synID(a:lnum, a:col, 1), 'name') ==# 'crystalStringDelimiter'
+endfunction
+
+" Find line above 'lnum' that isn't empty, in a comment, or in a string.
+function s:PrevNonBlankNonString(lnum)
+  let in_block = 0
+  let lnum = prevnonblank(a:lnum)
+  while lnum > 0
+    " Go in and out of blocks comments as necessary.
+    " If the line isn't empty (with opt. comment) or in a string, end search.
+    let line = getline(lnum)
+    if line =~# '^=begin'
+      if in_block
+        let in_block = 0
+      else
+        break
+      endif
+    elseif !in_block && line =~# '^=end'
+      let in_block = 1
+    elseif !in_block && line !~# '^\s*#.*$' && !(s:IsInStringOrComment(lnum, 1)
+          \ && s:IsInStringOrComment(lnum, strlen(line)))
+      break
+    endif
+    let lnum = prevnonblank(lnum - 1)
+  endwhile
+  return lnum
+endfunction
+
+" Find line above 'lnum' that started the continuation 'lnum' may be part of.
+function s:GetMSL(lnum)
+  " Start on the line we're at and use its indent.
+  let msl = a:lnum
+  let msl_body = getline(msl)
+  let lnum = s:PrevNonBlankNonString(a:lnum - 1)
+  while lnum > 0
+    " If we have a continuation line, or we're in a string, use line as MSL.
+    " Otherwise, terminate search as we have found our MSL already.
+    let line = getline(lnum)
+
+    if s:Match(msl, s:leading_operator_regex)
+      " If the current line starts with a leading operator, keep its indent
+      " and keep looking for an MSL.
+      let msl = lnum
+    elseif s:Match(lnum, s:splat_regex)
+      " If the above line looks like the "*" of a splat, use the current one's
+      " indentation.
+      "
+      " Example:
+      "   Hash[*
+      "     method_call do
+      "       something
+      "
+      return msl
+    elseif s:Match(lnum, s:non_bracket_continuation_regex) &&
+          \ s:Match(msl, s:non_bracket_continuation_regex)
+      " If the current line is a non-bracket continuation and so is the
+      " previous one, keep its indent and continue looking for an MSL.
+      "
+      " Example:
+      "   method_call one,
+      "     two,
+      "     three
+      "
+      let msl = lnum
+    elseif s:Match(lnum, s:non_bracket_continuation_regex) &&
+          \ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex))
+      " If the current line is a bracket continuation or a block-starter, but
+      " the previous is a non-bracket one, respect the previous' indentation,
+      " and stop here.
+      "
+      " Example:
+      "   method_call one,
+      "     two {
+      "     three
+      "
+      return lnum
+    elseif s:Match(lnum, s:bracket_continuation_regex) &&
+          \ (s:Match(msl, s:bracket_continuation_regex) || s:Match(msl, s:block_continuation_regex))
+      " If both lines are bracket continuations (the current may also be a
+      " block-starter), use the current one's and stop here
+      "
+      " Example:
+      "   method_call(
+      "     other_method_call(
+      "       foo
+      return msl
+    elseif s:Match(lnum, s:block_regex) &&
+          \ !s:Match(msl, s:continuation_regex) &&
+          \ !s:Match(msl, s:block_continuation_regex)
+      " If the previous line is a block-starter and the current one is
+      " mostly ordinary, use the current one as the MSL.
+      "
+      " Example:
+      "   method_call do
+      "     something
+      "     something_else
+      return msl
+    else
+      let col = match(line, s:continuation_regex) + 1
+      if (col > 0 && !s:IsInStringOrComment(lnum, col))
+            \ || s:IsInString(lnum, strlen(line))
+        let msl = lnum
+      else
+        break
+      endif
+    endif
+
+    let msl_body = getline(msl)
+    let lnum = s:PrevNonBlankNonString(lnum - 1)
+  endwhile
+  return msl
+endfunction
+
+" Check if line 'lnum' has more opening brackets than closing ones.
+function s:ExtraBrackets(lnum)
+  let opening = {'parentheses': [], 'braces': [], 'brackets': []}
+  let closing = {'parentheses': [], 'braces': [], 'brackets': []}
+
+  let line = getline(a:lnum)
+  let pos  = match(line, '[][(){}]', 0)
+
+  " Save any encountered opening brackets, and remove them once a matching
+  " closing one has been found. If a closing bracket shows up that doesn't
+  " close anything, save it for later.
+  while pos != -1
+    if !s:IsInStringOrComment(a:lnum, pos + 1)
+      if line[pos] ==# '('
+        call add(opening.parentheses, {'type': '(', 'pos': pos})
+      elseif line[pos] ==# ')'
+        if empty(opening.parentheses)
+          call add(closing.parentheses, {'type': ')', 'pos': pos})
+        else
+          let opening.parentheses = opening.parentheses[0:-2]
+        endif
+      elseif line[pos] ==# '{'
+        call add(opening.braces, {'type': '{', 'pos': pos})
+      elseif line[pos] ==# '}'
+        if empty(opening.braces)
+          call add(closing.braces, {'type': '}', 'pos': pos})
+        else
+          let opening.braces = opening.braces[0:-2]
+        endif
+      elseif line[pos] ==# '['
+        call add(opening.brackets, {'type': '[', 'pos': pos})
+      elseif line[pos] ==# ']'
+        if empty(opening.brackets)
+          call add(closing.brackets, {'type': ']', 'pos': pos})
+        else
+          let opening.brackets = opening.brackets[0:-2]
+        endif
+      endif
+    endif
+
+    let pos = match(line, '[][(){}]', pos + 1)
+  endwhile
+
+  " Find the rightmost brackets, since they're the ones that are important in
+  " both opening and closing cases
+  let rightmost_opening = {'type': '(', 'pos': -1}
+  let rightmost_closing = {'type': ')', 'pos': -1}
+
+  for opening in opening.parentheses + opening.braces + opening.brackets
+    if opening.pos > rightmost_opening.pos
+      let rightmost_opening = opening
+    endif
+  endfor
+
+  for closing in closing.parentheses + closing.braces + closing.brackets
+    if closing.pos > rightmost_closing.pos
+      let rightmost_closing = closing
+    endif
+  endfor
+
+  return [rightmost_opening, rightmost_closing]
+endfunction
+
+function s:Match(lnum, regex)
+  let line   = getline(a:lnum)
+  let offset = match(line, '\C'.a:regex)
+  let col    = offset + 1
+
+  while offset > -1 && s:IsInStringOrComment(a:lnum, col)
+    let offset = match(line, '\C'.a:regex, offset + 1)
+    let col = offset + 1
+  endwhile
+
+  if offset > -1
+    return col
+  else
+    return 0
+  endif
+endfunction
+
+" Locates the containing class/module's definition line, ignoring nested classes
+" along the way.
+"
+function! s:FindContainingClass()
+  let saved_position = getpos('.')
+
+  while searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
+        \ s:end_skip_expr) > 0
+    if expand('<cword>') =~# '\<class\|module\>'
+      let found_lnum = line('.')
+      call setpos('.', saved_position)
+      return found_lnum
+    endif
+  endwhile
+
+  call setpos('.', saved_position)
+  return 0
+endfunction
+
+" 3. GetCrystalIndent Function {{{1
+" =========================
+
+function GetCrystalIndent(...)
+  " 3.1. Setup {{{2
+  " ----------
+
+  " The value of a single shift-width
+  if exists('*shiftwidth')
+    let sw = shiftwidth()
+  else
+    let sw = &sw
+  endif
+
+  " For the current line, use the first argument if given, else v:lnum
+  let clnum = a:0 ? a:1 : v:lnum
+
+  " Set up variables for restoring position in file.  Could use clnum here.
+  let vcol = col('.')
+
+  " 3.2. Work on the current line {{{2
+  " -----------------------------
+
+  " Get the current line.
+  let line = getline(clnum)
+  let ind = -1
+
+  " If this line is an access modifier keyword, align according to the closest
+  " class declaration.
+  if g:crystal_indent_access_modifier_style ==? 'indent'
+    if s:Match(clnum, s:access_modifier_regex)
+      let class_line = s:FindContainingClass()
+      if class_line > 0
+        return indent(class_line) + sw
+      endif
+    endif
+  elseif g:crystal_indent_access_modifier_style ==? 'outdent'
+    if s:Match(clnum, s:access_modifier_regex)
+      let class_line = s:FindContainingClass()
+      if class_line > 0
+        return indent(class_line)
+      endif
+    endif
+  endif
+
+  " If we got a closing bracket on an empty line, find its match and indent
+  " according to it.  For parentheses we indent to its column - 1, for the
+  " others we indent to the containing line's MSL's level.  Return -1 if fail.
+  let col = matchend(line, '^\s*[]})]')
+  if col > 0 && !s:IsInStringOrComment(clnum, col)
+    call cursor(clnum, col)
+    let bs = strpart('(){}[]', stridx(')}]', line[col - 1]) * 2, 2)
+    if searchpair(escape(bs[0], '\['), '', bs[1], 'bW', s:skip_expr) > 0
+      if line[col-1] ==# ')' && col('.') != col('$') - 1
+        let ind = virtcol('.') - 1
+      else
+        let ind = indent(s:GetMSL(line('.')))
+      endif
+    endif
+    return ind
+  endif
+
+  " If we have a =begin or =end set indent to first column.
+  if match(line, '^\s*\%(=begin\|=end\)$') != -1
+    return 0
+  endif
+
+  " If we have a deindenting keyword, find its match and indent to its level.
+  " TODO: this is messy
+  if s:Match(clnum, s:crystal_deindent_keywords)
+    call cursor(clnum, 1)
+    if searchpair(s:end_start_regex, s:end_middle_regex, s:end_end_regex, 'bW',
+          \ s:end_skip_expr) > 0
+      let msl  = s:GetMSL(line('.'))
+      let line = getline(line('.'))
+
+      if strpart(line, 0, col('.') - 1) =~# '=\s*$' &&
+            \ strpart(line, col('.') - 1, 2) !~# 'do'
+        " assignment to case/begin/etc, on the same line, hanging indent
+        let ind = virtcol('.') - 1
+      elseif getline(msl) =~# '=\s*\(#.*\)\=$'
+        " in the case of assignment to the msl, align to the starting line,
+        " not to the msl
+        let ind = indent(line('.'))
+      else
+        " align to the msl
+        let ind = indent(msl)
+      endif
+    endif
+    return ind
+  endif
+
+  " If we are in a multi-line string or line-comment, don't do anything to it.
+  if s:IsInStringOrDocumentation(clnum, matchend(line, '^\s*') + 1)
+    return indent('.')
+  endif
+
+  " If we are at the closing delimiter of a "<<" heredoc-style string, set the
+  " indent to 0.
+  if line =~# '^\k\+\s*$'
+        \ && s:IsInStringDelimiter(clnum, 1)
+        \ && search('\V<<'.line, 'nbW') > 0
+    return 0
+  endif
+
+  " If the current line starts with a leading operator, add a level of indent.
+  if s:Match(clnum, s:leading_operator_regex)
+    return indent(s:GetMSL(clnum)) + sw
+  endif
+
+  " 3.3. Work on the previous line. {{{2
+  " -------------------------------
+
+  " Find a non-blank, non-multi-line string line above the current line.
+  let lnum = s:PrevNonBlankNonString(clnum - 1)
+
+  " If the line is empty and inside a string, use the previous line.
+  if line =~# '^\s*$' && lnum != prevnonblank(clnum - 1)
+    return indent(prevnonblank(clnum))
+  endif
+
+  " At the start of the file use zero indent.
+  if lnum == 0
+    return 0
+  endif
+
+  " Set up variables for the previous line.
+  let line = getline(lnum)
+  let ind = indent(lnum)
+
+  if s:Match(lnum, s:continuable_regex) && s:Match(lnum, s:continuation_regex)
+    return indent(s:GetMSL(lnum)) + sw + sw
+  endif
+
+  " If the previous line ended with a block opening, add a level of indent.
+  if s:Match(lnum, s:block_regex)
+    let msl = s:GetMSL(lnum)
+
+    if getline(msl) =~# '=\s*\(#.*\)\=$'
+      " in the case of assignment to the msl, align to the starting line,
+      " not to the msl
+      let ind = indent(lnum) + sw
+    else
+      let ind = indent(msl) + sw
+    endif
+    return ind
+  endif
+
+  " If the previous line started with a leading operator, use its MSL's level
+  " of indent
+  if s:Match(lnum, s:leading_operator_regex)
+    return indent(s:GetMSL(lnum))
+  endif
+
+  " If the previous line ended with the "*" of a splat, add a level of indent
+  if line =~ s:splat_regex
+    return indent(lnum) + sw
+  endif
+
+  " If the previous line contained unclosed opening brackets and we are still
+  " in them, find the rightmost one and add indent depending on the bracket
+  " type.
+  "
+  " If it contained hanging closing brackets, find the rightmost one, find its
+  " match and indent according to that.
+  if line =~# '[[({]' || line =~# '[])}]\s*\%(#.*\)\=$'
+    let [opening, closing] = s:ExtraBrackets(lnum)
+
+    if opening.pos != -1
+      if opening.type ==# '(' && searchpair('(', '', ')', 'bW', s:skip_expr) > 0
+        if col('.') + 1 == col('$')
+          return ind + sw
+        else
+          return virtcol('.')
+        endif
+      else
+        let nonspace = matchend(line, '\S', opening.pos + 1) - 1
+        return nonspace > 0 ? nonspace : ind + sw
+      endif
+    elseif closing.pos != -1
+      call cursor(lnum, closing.pos + 1)
+      normal! %
+
+      if s:Match(line('.'), s:crystal_indent_keywords)
+        return indent('.') + sw
+      else
+        return indent('.')
+      endif
+    else
+      call cursor(clnum, vcol)
+    end
+  endif
+
+  " If the previous line ended with an "end", match that "end"s beginning's
+  " indent.
+  let col = s:Match(lnum, '\%(^\|[^.:@$]\)\<end\>\s*\%(#.*\)\=$')
+  if col > 0
+    call cursor(lnum, col)
+    if searchpair(s:end_start_regex, '', s:end_end_regex, 'bW',
+          \ s:end_skip_expr) > 0
+      let n = line('.')
+      let ind = indent('.')
+      let msl = s:GetMSL(n)
+      if msl != n
+        let ind = indent(msl)
+      end
+      return ind
+    endif
+  end
+
+  let col = s:Match(lnum, s:crystal_indent_keywords)
+  if col > 0
+    call cursor(lnum, col)
+    let ind = virtcol('.') - 1 + sw
+    " TODO: make this better (we need to count them) (or, if a searchpair
+    " fails, we know that something is lacking an end and thus we indent a
+    " level
+    if s:Match(lnum, s:end_end_regex)
+      let ind = indent('.')
+    endif
+    return ind
+  endif
+
+  " 3.4. Work on the MSL line. {{{2
+  " --------------------------
+
+  " Set up variables to use and search for MSL to the previous line.
+  let p_lnum = lnum
+  let lnum = s:GetMSL(lnum)
+
+  " If the previous line wasn't a MSL.
+  if p_lnum != lnum
+    " If previous line ends bracket and begins non-bracket continuation decrease indent by 1.
+    if s:Match(p_lnum, s:bracket_switch_continuation_regex)
+      return ind - 1
+    " If previous line is a continuation return its indent.
+    " TODO: the || s:IsInString() thing worries me a bit.
+    elseif s:Match(p_lnum, s:non_bracket_continuation_regex) || s:IsInString(p_lnum,strlen(line))
+      return ind
+    endif
+  endif
+
+  " Set up more variables, now that we know we wasn't continuation bound.
+  let line = getline(lnum)
+  let msl_ind = indent(lnum)
+
+  " If the MSL line had an indenting keyword in it, add a level of indent.
+  " TODO: this does not take into account contrived things such as
+  " module Foo; class Bar; end
+  if s:Match(lnum, s:crystal_indent_keywords)
+    let ind = msl_ind + sw
+    if s:Match(lnum, s:end_end_regex)
+      let ind = ind - sw
+    endif
+    return ind
+  endif
+
+  " If the previous line ended with [*+/.,-=], but wasn't a block ending or a
+  " closing bracket, indent one extra level.
+  if s:Match(lnum, s:non_bracket_continuation_regex) && !s:Match(lnum, '^\s*\([\])}]\|end\)')
+    if lnum == p_lnum
+      let ind = msl_ind + sw
+    else
+      let ind = msl_ind
+    endif
+    return ind
+  endif
+
+  " }}}2
+
+  return ind
+endfunction
+
+" }}}1
+
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
+" vim:set sw=2 sts=2 ts=8 et:
+
+endif

syntax/crystal.vim

@@ -0,0 +1,393 @@
+if !exists('g:polyglot_disabled') || index(g:polyglot_disabled, 'crystal') == -1
+  
+" Language: Crystal
+" Based on Ruby syntax highlight
+" which is made by Mirko Nasato and Doug Kearns
+" ---------------------------------------------
+
+if exists('b:current_syntax')
+  finish
+endif
+
+syn cluster crystalNotTop contains=@crystalExtendedStringSpecial,@crystalRegexpSpecial,@crystalDeclaration,crystalConditional,crystalExceptional,crystalMethodExceptional,crystalTodo,crystalLinkAttr
+
+if exists('crystal_space_errors')
+  if !exists('crystal_no_trail_space_error')
+    syn match crystalSpaceError display excludenl "\s\+$"
+  endif
+  if !exists('crystal_no_tab_space_error')
+    syn match crystalSpaceError display " \+\t"me=e-1
+  endif
+endif
+
+" Operators
+if exists('crystal_operators')
+  syn match  crystalOperator "[~!^&|*/%+-]\|\%(class\s*\)\@<!<<\|<=>\|<=\|\%(<\|\<class\s\+\u\w*\s*\)\@<!<[^<]\@=\|===\|==\|=\~\|>>\|>=\|=\@<!>\|\*\*\|\.\.\.\|\.\.\|::"
+  syn match  crystalOperator "->\|-=\|/=\|\*\*=\|\*=\|&&=\|&=\|&&\|||=\||=\|||\|%=\|+=\|!\~\|!="
+  syn region crystalBracketOperator matchgroup=crystalOperator start="\%(\w[?!]\=\|[]})]\)\@<=\[\s*" end="\s*]" contains=ALLBUT,@crystalNotTop
+endif
+
+" Expression Substitution and Backslash Notation
+syn match crystalStringEscape "\\\\\|\\[abefnrstv]\|\\\o\{1,3}\|\\x\x\{1,2}"						    contained display
+syn match crystalStringEscape "\%(\\M-\\C-\|\\C-\\M-\|\\M-\\c\|\\c\\M-\|\\c\|\\C-\|\\M-\)\%(\\\o\{1,3}\|\\x\x\{1,2}\|\\\=\S\)" contained display
+
+syn region crystalInterpolation	      matchgroup=crystalInterpolationDelimiter start="#{" end="}" contained contains=ALLBUT,@crystalNotTop
+syn match  crystalInterpolation	      "#\%(\$\|@@\=\)\w\+"    display contained contains=crystalInterpolationDelimiter,crystalInstanceVariable,crystalClassVariable,crystalGlobalVariable,crystalPredefinedVariable
+syn match  crystalInterpolationDelimiter "#\ze\%(\$\|@@\=\)\w\+" display contained
+syn match  crystalInterpolation	      "#\$\%(-\w\|\W\)"       display contained contains=crystalInterpolationDelimiter,crystalPredefinedVariable,crystalInvalidVariable
+syn match  crystalInterpolationDelimiter "#\ze\$\%(-\w\|\W\)"    display contained
+syn region crystalNoInterpolation	      start="\\#{" end="}"            contained
+syn match  crystalNoInterpolation	      "\\#{"		      display contained
+syn match  crystalNoInterpolation	      "\\#\%(\$\|@@\=\)\w\+"  display contained
+syn match  crystalNoInterpolation	      "\\#\$\W"		      display contained
+
+syn match crystalDelimEscape	"\\[(<{\[)>}\]]" transparent display contained contains=NONE
+
+syn region crystalNestedParentheses    start="("  skip="\\\\\|\\)"  matchgroup=crystalString end=")"	transparent contained
+syn region crystalNestedCurlyBraces    start="{"  skip="\\\\\|\\}"  matchgroup=crystalString end="}"	transparent contained
+syn region crystalNestedAngleBrackets  start="<"  skip="\\\\\|\\>"  matchgroup=crystalString end=">"	transparent contained
+syn region crystalNestedSquareBrackets start="\[" skip="\\\\\|\\\]" matchgroup=crystalString end="\]"	transparent contained
+
+" These are mostly Oniguruma ready
+syn region crystalRegexpComment	matchgroup=crystalRegexpSpecial   start="(?#"								  skip="\\)"  end=")"  contained
+syn region crystalRegexpParens	matchgroup=crystalRegexpSpecial   start="(\(?:\|?<\=[=!]\|?>\|?<[a-z_]\w*>\|?[imx]*-[imx]*:\=\|\%(?#\)\@!\)" skip="\\)"  end=")"  contained transparent contains=@crystalRegexpSpecial
+syn region crystalRegexpBrackets	matchgroup=crystalRegexpCharClass start="\[\^\="								  skip="\\\]" end="\]" contained transparent contains=crystalStringEscape,crystalRegexpEscape,crystalRegexpCharClass oneline
+syn match  crystalRegexpCharClass	"\\[DdHhSsWw]"	       contained display
+syn match  crystalRegexpCharClass	"\[:\^\=\%(alnum\|alpha\|ascii\|blank\|cntrl\|digit\|graph\|lower\|print\|punct\|space\|upper\|xdigit\):\]" contained
+syn match  crystalRegexpEscape	"\\[].*?+^$|\\/(){}[]" contained
+syn match  crystalRegexpQuantifier	"[*?+][?+]\="	       contained display
+syn match  crystalRegexpQuantifier	"{\d\+\%(,\d*\)\=}?\=" contained display
+syn match  crystalRegexpAnchor	"[$^]\|\\[ABbGZz]"     contained display
+syn match  crystalRegexpDot	"\."		       contained display
+syn match  crystalRegexpSpecial	"|"		       contained display
+syn match  crystalRegexpSpecial	"\\[1-9]\d\=\d\@!"     contained display
+syn match  crystalRegexpSpecial	"\\k<\%([a-z_]\w*\|-\=\d\+\)\%([+-]\d\+\)\=>" contained display
+syn match  crystalRegexpSpecial	"\\k'\%([a-z_]\w*\|-\=\d\+\)\%([+-]\d\+\)\='" contained display
+syn match  crystalRegexpSpecial	"\\g<\%([a-z_]\w*\|-\=\d\+\)>" contained display
+syn match  crystalRegexpSpecial	"\\g'\%([a-z_]\w*\|-\=\d\+\)'" contained display
+
+syn cluster crystalStringSpecial	      contains=crystalInterpolation,crystalNoInterpolation,crystalStringEscape
+syn cluster crystalExtendedStringSpecial contains=@crystalStringSpecial,crystalNestedParentheses,crystalNestedCurlyBraces,crystalNestedAngleBrackets,crystalNestedSquareBrackets
+syn cluster crystalRegexpSpecial	      contains=crystalInterpolation,crystalNoInterpolation,crystalStringEscape,crystalRegexpSpecial,crystalRegexpEscape,crystalRegexpBrackets,crystalRegexpCharClass,crystalRegexpDot,crystalRegexpQuantifier,crystalRegexpAnchor,crystalRegexpParens,crystalRegexpComment
+
+" Numbers and ASCII Codes
+syn match crystalASCIICode	"\%(\w\|[]})\"'/]\)\@<!\%(?\%(\\M-\\C-\|\\C-\\M-\|\\M-\\c\|\\c\\M-\|\\c\|\\C-\|\\M-\)\=\%(\\\o\{1,3}\|\\x\x\{1,2}\|\\\=\S\)\)"
+syn match crystalInteger	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<0[xX]\x\+\%(_\x\+\)*\%(_*[ufi]\%(32\|64\)\)\=\>"								display
+syn match crystalInteger	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<\%(0[dD]\)\=\%(0\|[1-9]\d*\%(_\d\+\)*\)\%(_\x\+\)*\%(_*[ufi]\%(32\|64\)\)\=\>"						display
+syn match crystalInteger	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<0[oO]\=\o\+\%(_\o\+\)*\%(_\x\+\)*\%(_*[ufi]\%(32\|64\)\)\=\>"								display
+syn match crystalInteger	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<0[bB][01]\+\%(_[01]\+\)*\%(_\x\+\)*\%(_*[ufi]\%(32\|64\)\)\=\>"								display
+syn match crystalFloat	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<\%(0\|[1-9]\d*\%(_\d\+\)*\)\.\d\+\%(_\d\+\)*\%(_*f\%(32\|64\)\)\=\>"					display
+syn match crystalFloat	"\%(\%(\w\|[]})\"']\s*\)\@<!-\)\=\<\%(0\|[1-9]\d*\%(_\d\+\)*\)\%(\.\d\+\%(_\d\+\)*\)\=\%([eE][-+]\=\d\+\%(_\d\+\)*\)\%(_*f\%(32\|64\)\)\=\>"	display
+
+" Identifiers
+syn match crystalLocalVariableOrMethod "\<[_[:lower:]][_[:alnum:]]*[?!=]\=" contains=NONE display transparent
+syn match crystalBlockArgument	    "&[_[:lower:]][_[:alnum:]]"		 contains=NONE display transparent
+
+syn match  crystalConstant		"\%(\%([.@$]\@<!\.\)\@<!\<\|::\)\_s*\zs\u\w*\%(\>\|::\)\@="
+syn match  crystalClassVariable	"@@\%(\h\|%\|[^\x00-\x7F]\)\%(\w\|%\|[^\x00-\x7F]\)*" display
+syn match  crystalInstanceVariable "@\%(\h\|%\|[^\x00-\x7F]\)\%(\w\|%\|[^\x00-\x7F]\)*"  display
+syn match  crystalGlobalVariable	"$\%(\%(\h\|%\|[^\x00-\x7F]\)\%(\w\|%\|[^\x00-\x7F]\)*\|-.\)"
+syn match  crystalFreshVariable		"\%(\h\|[^\x00-\x7F]\)\@<!%\%(\h\|[^\x00-\x7F]\)\%(\w\|%\|[^\x00-\x7F]\)*" display
+syn match  crystalSymbol		"[]})\"':]\@<!:\%(\^\|\~\|<<\|<=>\|<=\|<\|===\|[=!]=\|[=!]\~\|!\|>>\|>=\|>\||\|-@\|-\|/\|\[][=?]\|\[]\|\*\*\|\*\|&\|%\|+@\|+\|`\)"
+syn match  crystalSymbol		"[]})\"':]\@<!:\$\%(-.\|[`~<=>_,;:!?/.'"@$*\&+0]\)"
+syn match  crystalSymbol		"[]})\"':]\@<!:\%(\$\|@@\=\)\=\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*"
+syn match  crystalSymbol		"[]})\"':]\@<!:\%(\h\|%\|[^\x00-\x7F]\)\%(\w\|%\|[^\x00-\x7F]\)*\%([?!=]>\@!\)\="
+syn match  crystalSymbol		"\%([{(,]\_s*\)\@<=\l\w*[!?]\=::\@!"he=e-1
+syn match  crystalSymbol		"[]})\"':]\@<!\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*[!?]\=:\s\@="he=e-1
+syn match  crystalSymbol		"\%([{(,]\_s*\)\@<=[[:space:],{]\l\w*[!?]\=::\@!"hs=s+1,he=e-1
+syn match  crystalSymbol		"[[:space:],{]\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*[!?]\=:\s\@="hs=s+1,he=e-1
+syn region crystalSymbol		start="[]})\"':]\@<!:\"" end="\"" skip="\\\\\|\\\"" contains=@crystalStringSpecial fold
+
+syn match  crystalBlockParameter	  "\%(\h\|%\|[^\x00-\x7F]\)\%(\w\|%\|[^\x00-\x7F]\)*" contained
+syn region crystalBlockParameterList start="\%(\%(\<do\>\|{\)\s*\)\@<=|" end="|" oneline display contains=crystalBlockParameter
+
+syn match crystalInvalidVariable	 "$[^ %A-Za-z_-]"
+syn match crystalPredefinedVariable #$[!$&"'*+,./0:;<=>?@\`~]#
+syn match crystalPredefinedVariable "$\d\+"										   display
+syn match crystalPredefinedVariable "$_\>"											   display
+syn match crystalPredefinedVariable "$-[0FIKadilpvw]\>"									   display
+syn match crystalPredefinedVariable "$\%(deferr\|defout\|stderr\|stdin\|stdout\)\>"					   display
+syn match crystalPredefinedVariable "$\%(DEBUG\|FILENAME\|KCODE\|LOADED_FEATURES\|LOAD_PATH\|PROGRAM_NAME\|SAFE\|VERBOSE\)\>" display
+syn match crystalPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(MatchingData\|ARGF\|ARGV\|ENV\)\>\%(\s*(\)\@!"
+syn match crystalPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(DATA\|FALSE\|NIL\)\>\%(\s*(\)\@!"
+syn match crystalPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(STDERR\|STDIN\|STDOUT\|TOPLEVEL_BINDING\|TRUE\)\>\%(\s*(\)\@!"
+syn match crystalPredefinedConstant "\%(\%(\.\@<!\.\)\@<!\|::\)\_s*\zs\%(crystal_\%(VERSION\|RELEASE_DATE\|PLATFORM\|PATCHLEVEL\|REVISION\|DESCRIPTION\|COPYRIGHT\|ENGINE\)\)\>\%(\s*(\)\@!"
+
+" Normal Regular Expression
+syn region crystalRegexp matchgroup=crystalRegexpDelimiter start="\%(\%(^\|\<\%(and\|or\|while\|until\|unless\|if\|elsif\|ifdef\|when\|not\|then\|else\)\|[;\~=!|&(,[<>?:*+-]\)\s*\)\@<=/" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@crystalRegexpSpecial fold
+syn region crystalRegexp matchgroup=crystalRegexpDelimiter start="\%(\h\k*\s\+\)\@<=/[ \t=]\@!" end="/[iomxneus]*" skip="\\\\\|\\/" contains=@crystalRegexpSpecial fold
+
+" Generalized Regular Expression
+syn region crystalRegexp matchgroup=crystalRegexpDelimiter start="%r\z([~`!@#$%^&*_\-+=|\:;"',.? /]\)" end="\z1[iomxneus]*" skip="\\\\\|\\\z1" contains=@crystalRegexpSpecial fold
+syn region crystalRegexp matchgroup=crystalRegexpDelimiter start="%r{"				 end="}[iomxneus]*"   skip="\\\\\|\\}"	 contains=@crystalRegexpSpecial fold
+syn region crystalRegexp matchgroup=crystalRegexpDelimiter start="%r<"				 end=">[iomxneus]*"   skip="\\\\\|\\>"	 contains=@crystalRegexpSpecial,crystalNestedAngleBrackets,crystalDelimEscape fold
+syn region crystalRegexp matchgroup=crystalRegexpDelimiter start="%r\["				 end="\][iomxneus]*"  skip="\\\\\|\\\]"	 contains=@crystalRegexpSpecial fold
+syn region crystalRegexp matchgroup=crystalRegexpDelimiter start="%r("				 end=")[iomxneus]*"   skip="\\\\\|\\)"	 contains=@crystalRegexpSpecial fold
+
+" Normal String and Shell Command Output
+syn region crystalString matchgroup=crystalStringDelimiter start="\"" end="\"" skip="\\\\\|\\\"" contains=@crystalStringSpecial,@Spell fold
+syn region crystalString matchgroup=crystalStringDelimiter start="`"	end="`"  skip="\\\\\|\\`"  contains=@crystalStringSpecial fold
+
+" Character
+syn match crystalCharLiteral "'\%([^\\]\|\\[abefnrstv'\\]\|\\\o\{1,3}\|\\x\x\{1,2}\|\\u\x\{4}\)'" contained display
+
+" Generalized Single Quoted String, Symbol and Array of Strings
+syn region crystalString matchgroup=crystalStringDelimiter start="%[qwi]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1" fold
+syn region crystalString matchgroup=crystalStringDelimiter start="%[qwi]{"				   end="}"   skip="\\\\\|\\}"	fold contains=crystalNestedCurlyBraces,crystalDelimEscape
+syn region crystalString matchgroup=crystalStringDelimiter start="%[qwi]<"				   end=">"   skip="\\\\\|\\>"	fold contains=crystalNestedAngleBrackets,crystalDelimEscape
+syn region crystalString matchgroup=crystalStringDelimiter start="%[qwi]\["				   end="\]"  skip="\\\\\|\\\]"	fold contains=crystalNestedSquareBrackets,crystalDelimEscape
+syn region crystalString matchgroup=crystalStringDelimiter start="%[qwi]("				   end=")"   skip="\\\\\|\\)"	fold contains=crystalNestedParentheses,crystalDelimEscape
+syn region crystalString matchgroup=crystalStringDelimiter start="%q "				   end=" "   skip="\\\\\|\\)"	fold
+syn region crystalSymbol matchgroup=crystalSymbolDelimiter start="%s\z([~`!@#$%^&*_\-+=|\:;"',.? /]\)"   end="\z1" skip="\\\\\|\\\z1" fold
+syn region crystalSymbol matchgroup=crystalSymbolDelimiter start="%s{"				   end="}"   skip="\\\\\|\\}"	fold contains=crystalNestedCurlyBraces,crystalDelimEscape
+syn region crystalSymbol matchgroup=crystalSymbolDelimiter start="%s<"				   end=">"   skip="\\\\\|\\>"	fold contains=crystalNestedAngleBrackets,crystalDelimEscape
+syn region crystalSymbol matchgroup=crystalSymbolDelimiter start="%s\["				   end="\]"  skip="\\\\\|\\\]"	fold contains=crystalNestedSquareBrackets,crystalDelimEscape
+syn region crystalSymbol matchgroup=crystalSymbolDelimiter start="%s("				   end=")"   skip="\\\\\|\\)"	fold contains=crystalNestedParentheses,crystalDelimEscape
+
+" Generalized Double Quoted String and Array of Strings and Shell Command Output
+" Note: %= is not matched here as the beginning of a double quoted string
+syn region crystalString matchgroup=crystalStringDelimiter start="%\z([~`!@#$%^&*_\-+|\:;"',.?/]\)"	    end="\z1" skip="\\\\\|\\\z1" contains=@crystalStringSpecial fold
+syn region crystalString matchgroup=crystalStringDelimiter start="%[QWIx]\z([~`!@#$%^&*_\-+=|\:;"',.?/]\)" end="\z1" skip="\\\\\|\\\z1" contains=@crystalStringSpecial fold
+syn region crystalString matchgroup=crystalStringDelimiter start="%[QWIx]\={"				    end="}"   skip="\\\\\|\\}"	 contains=@crystalStringSpecial,crystalNestedCurlyBraces,crystalDelimEscape    fold
+syn region crystalString matchgroup=crystalStringDelimiter start="%[QWIx]\=<"				    end=">"   skip="\\\\\|\\>"	 contains=@crystalStringSpecial,crystalNestedAngleBrackets,crystalDelimEscape  fold
+syn region crystalString matchgroup=crystalStringDelimiter start="%[QWIx]\=\["				    end="\]"  skip="\\\\\|\\\]"	 contains=@crystalStringSpecial,crystalNestedSquareBrackets,crystalDelimEscape fold
+syn region crystalString matchgroup=crystalStringDelimiter start="%[QWIx]\=("				    end=")"   skip="\\\\\|\\)"	 contains=@crystalStringSpecial,crystalNestedParentheses,crystalDelimEscape    fold
+syn region crystalString matchgroup=crystalStringDelimiter start="%[Qx] "				    end=" "   skip="\\\\\|\\)"   contains=@crystalStringSpecial fold
+
+" Here Document
+syn region crystalHeredocStart matchgroup=crystalStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs\%(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)+	 end=+$+ oneline contains=ALLBUT,@crystalNotTop
+syn region crystalHeredocStart matchgroup=crystalStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs"\%([^"]*\)"+ end=+$+ oneline contains=ALLBUT,@crystalNotTop
+syn region crystalHeredocStart matchgroup=crystalStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs'\%([^']*\)'+ end=+$+ oneline contains=ALLBUT,@crystalNotTop
+syn region crystalHeredocStart matchgroup=crystalStringDelimiter start=+\%(\%(class\s*\|\%([]})"'.]\|::\)\)\_s*\|\w\)\@<!<<-\=\zs`\%([^`]*\)`+ end=+$+ oneline contains=ALLBUT,@crystalNotTop
+
+syn region crystalString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+2	matchgroup=crystalStringDelimiter end=+^\z1$+ contains=crystalHeredocStart,crystalHeredoc,@crystalStringSpecial fold keepend
+syn region crystalString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<"\z([^"]*\)"\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+2	matchgroup=crystalStringDelimiter end=+^\z1$+ contains=crystalHeredocStart,crystalHeredoc,@crystalStringSpecial fold keepend
+syn region crystalString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<'\z([^']*\)'\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+2	matchgroup=crystalStringDelimiter end=+^\z1$+ contains=crystalHeredocStart,crystalHeredoc			fold keepend
+syn region crystalString start=+\%(\%(class\|::\)\_s*\|\%([]})"'.]\)\s\|\w\)\@<!<<`\z([^`]*\)`\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+2	matchgroup=crystalStringDelimiter end=+^\z1$+ contains=crystalHeredocStart,crystalHeredoc,@crystalStringSpecial fold keepend
+
+syn region crystalString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<-\z(\%(\h\|[^\x00-\x7F]\)\%(\w\|[^\x00-\x7F]\)*\)\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+3    matchgroup=crystalStringDelimiter end=+^\s*\zs\z1$+ contains=crystalHeredocStart,@crystalStringSpecial fold keepend
+syn region crystalString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<-"\z([^"]*\)"\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+3  matchgroup=crystalStringDelimiter end=+^\s*\zs\z1$+ contains=crystalHeredocStart,@crystalStringSpecial fold keepend
+syn region crystalString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<-'\z([^']*\)'\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+3  matchgroup=crystalStringDelimiter end=+^\s*\zs\z1$+ contains=crystalHeredocStart		     fold keepend
+syn region crystalString start=+\%(\%(class\|::\)\_s*\|\%([]}).]\)\s\|\w\)\@<!<<-`\z([^`]*\)`\ze\%(.*<<-\=['`"]\=\h\)\@!+hs=s+3  matchgroup=crystalStringDelimiter end=+^\s*\zs\z1$+ contains=crystalHeredocStart,@crystalStringSpecial fold keepend
+
+if exists('main_syntax') && g:main_syntax ==# 'ecrystal'
+  let b:crystal_no_expensive = 1
+end
+
+syn match  crystalAliasDeclaration    "[^[:space:];#.()]\+" contained contains=crystalSymbol,crystalGlobalVariable,crystalPredefinedVariable nextgroup=crystalAliasDeclaration2 skipwhite
+syn match  crystalAliasDeclaration2   "[^[:space:];#.()]\+" contained contains=crystalSymbol,crystalGlobalVariable,crystalPredefinedVariable
+syn match  crystalMethodDeclaration   "[^[:space:];#(]\+"	 contained contains=crystalConstant,crystalBoolean,crystalPseudoVariable,crystalInstanceVariable,crystalClassVariable,crystalGlobalVariable
+syn match  crystalFunctionDeclaration "[^[:space:];#=]\+"	 contained contains=crystalConstant
+syn match  crystalTypeDeclaration     "[^[:space:];#=]\+"	 contained contains=crystalConstant
+syn match  crystalClassDeclaration    "[^[:space:];#<]\+"	 contained contains=crystalConstant,crystalOperator
+syn match  crystalModuleDeclaration   "[^[:space:];#<]\+"	 contained contains=crystalConstant,crystalOperator
+syn match  crystalStructDeclaration   "[^[:space:];#<]\+"	 contained contains=crystalConstant,crystalOperator
+syn match  crystalLibDeclaration      "[^[:space:];#<]\+"	 contained contains=crystalConstant,crystalOperator
+syn match  crystalMacroDeclaration    "[^[:space:];#<\"]\+"	 contained contains=crystalConstant,crystalOperator
+syn match  crystalEnumDeclaration     "[^[:space:];#<\"]\+"	 contained contains=crystalConstant
+syn match  crystalFunction "\<[_[:alpha:]][_[:alnum:]]*[?!=]\=[[:alnum:]_.:?!=]\@!" contained containedin=crystalMethodDeclaration,crystalFunctionDeclaration
+syn match  crystalFunction "\%(\s\|^\)\@<=[_[:alpha:]][_[:alnum:]]*[?!=]\=\%(\s\|$\)\@=" contained containedin=crystalAliasDeclaration,crystalAliasDeclaration2
+syn match  crystalFunction "\%([[:space:].]\|^\)\@<=\%(\[\][=?]\=\|\*\*\|[+-]@\=\|[*/%|&^~]\|<<\|>>\|[<>]=\=\|<=>\|===\|[=!]=\|[=!]\~\|!\|`\)\%([[:space:];#(]\|$\)\@=" contained containedin=crystalAliasDeclaration,crystalAliasDeclaration2,crystalMethodDeclaration,crystalFunctionDeclaration
+
+syn cluster crystalDeclaration contains=crystalAliasDeclaration,crystalAliasDeclaration2,crystalMethodDeclaration,crystalFunctionDeclaration,crystalModuleDeclaration,crystalClassDeclaration,crystalStructDeclaration,crystalLibDeclaration,crystalMacroDeclaration,crystalFunction,crystalBlockParameter,crystalTypeDeclaration,crystalEnumDeclaration
+
+" Keywords
+" Note: the following keywords have already been defined:
+" begin case class def do end for if module unless until while
+syn match   crystalControl	       "\<\%(break\|in\|next\|rescue\|return\)\>[?!]\@!"
+syn match   crystalOperator       "\<defined?" display
+syn match   crystalKeyword	       "\<\%(super\|previous_def\|yield\|as\|of\|with\)\>[?!]\@!"
+syn match   crystalBoolean	       "\<\%(true\|false\)\>[?!]\@!"
+syn match   crystalPseudoVariable "\<\%(nil\|self\|__DIR__\|__FILE__\|__LINE__\)\>[?!]\@!" " TODO: reorganise
+
+" Expensive Mode - match 'end' with the appropriate opening keyword for syntax
+" based folding and special highlighting of module/class/method definitions
+if !exists('b:crystal_no_expensive') && !exists('crystal_no_expensive')
+  syn match crystalDefine "\<alias\>"  nextgroup=crystalAliasDeclaration  skipwhite skipnl
+  syn match crystalDefine "\<def\>"    nextgroup=crystalMethodDeclaration skipwhite skipnl
+  syn match crystalDefine "\<fun\>"    nextgroup=crystalFunctionDeclaration skipwhite skipnl
+  syn match crystalDefine "\<undef\>"  nextgroup=crystalFunction	     skipwhite skipnl
+  syn match crystalDefine "\<\%(type\|alias\)\>\%(\s*\h\w*\s*=\)\@=" nextgroup=crystalTypeDeclaration skipwhite skipnl
+  syn match crystalClass  "\<class\>"  nextgroup=crystalClassDeclaration  skipwhite skipnl
+  syn match crystalModule "\<module\>" nextgroup=crystalModuleDeclaration skipwhite skipnl
+  syn match crystalStruct "\<struct\>" nextgroup=crystalStructDeclaration skipwhite skipnl
+  syn match crystalLib	  "\<lib\>" nextgroup=crystalLibDeclaration skipwhite skipnl
+  syn match crystalMacro  "\<macro\>" nextgroup=crystalMacroDeclaration skipwhite skipnl
+  syn match crystalEnum	  "\<enum\>" nextgroup=crystalEnumDeclaration skipwhite skipnl
+
+  syn region crystalMethodBlock start="\<\%(def\|macro\)\>"	matchgroup=crystalDefine end="\%(\<\%(def\|macro\)\_s\+\)\@<!\<end\>" contains=ALLBUT,@crystalNotTop fold
+  syn region crystalBlock	     start="\<class\>"	matchgroup=crystalClass  end="\<end\>"		       contains=ALLBUT,@crystalNotTop fold
+  syn region crystalBlock	     start="\<module\>" matchgroup=crystalModule end="\<end\>"		       contains=ALLBUT,@crystalNotTop fold
+  syn region crystalBlock	     start="\<struct\>" matchgroup=crystalStruct end="\<end\>"		       contains=ALLBUT,@crystalNotTop fold
+  syn region crystalBlock	     start="\<lib\>" matchgroup=crystalLib    end="\<end\>"		       contains=ALLBUT,@crystalNotTop fold
+  syn region crystalBlock	     start="\<enum\>" matchgroup=crystalEnum    end="\<end\>"		       contains=ALLBUT,@crystalNotTop fold
+
+  " modifiers
+  syn match crystalConditionalModifier "\<\%(if\|unless\|ifdef\)\>"    display
+  syn match crystalRepeatModifier	     "\<\%(while\|until\)\>" display
+
+  syn region crystalDoBlock      matchgroup=crystalControl start="\<do\>" end="\<end\>"                 contains=ALLBUT,@crystalNotTop fold
+  " curly bracket block or hash literal
+  syn region crystalCurlyBlock	matchgroup=crystalCurlyBlockDelimiter  start="{" end="}"				contains=ALLBUT,@crystalNotTop fold
+  syn region crystalArrayLiteral	matchgroup=crystalArrayDelimiter	    start="\%(\w\|[\]})]\)\@<!\[" end="]"	contains=ALLBUT,@crystalNotTop fold
+
+  " statements without 'do'
+  syn region crystalBlockExpression       matchgroup=crystalControl	  start="\<begin\>" end="\<end\>" contains=ALLBUT,@crystalNotTop fold
+  syn region crystalCaseExpression	       matchgroup=crystalConditional start="\<case\>"  end="\<end\>" contains=ALLBUT,@crystalNotTop fold
+  syn region crystalConditionalExpression matchgroup=crystalConditional start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+=-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![?!]\)\s*\)\@<=\%(if\|ifdef\|unless\)\>" end="\%(\%(\%(\.\@<!\.\)\|::\)\s*\)\@<!\<end\>" contains=ALLBUT,@crystalNotTop fold
+
+  syn match crystalConditional "\<\%(then\|else\|when\)\>[?!]\@!"	contained containedin=crystalCaseExpression
+  syn match crystalConditional "\<\%(then\|else\|elsif\)\>[?!]\@!" contained containedin=crystalConditionalExpression
+
+  syn match crystalExceptional	  "\<\%(\%(\%(;\|^\)\s*\)\@<=rescue\|else\|ensure\)\>[?!]\@!" contained containedin=crystalBlockExpression
+  syn match crystalMethodExceptional "\<\%(\%(\%(;\|^\)\s*\)\@<=rescue\|else\|ensure\)\>[?!]\@!" contained containedin=crystalMethodBlock
+
+  " statements with optional 'do'
+  syn region crystalOptionalDoLine   matchgroup=crystalRepeat start="\<for\>[?!]\@!" start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![!=?]\)\s*\)\@<=\<\%(until\|while\)\>" matchgroup=crystalOptionalDo end="\%(\<do\>\)" end="\ze\%(;\|$\)" oneline contains=ALLBUT,@crystalNotTop
+  syn region crystalRepeatExpression start="\<for\>[?!]\@!" start="\%(\%(^\|\.\.\.\=\|[{:,;([<>~\*/%&^|+-]\|\%(\<[_[:lower:]][_[:alnum:]]*\)\@<![!=?]\)\s*\)\@<=\<\%(until\|while\)\>" matchgroup=crystalRepeat end="\<end\>" contains=ALLBUT,@crystalNotTop nextgroup=crystalOptionalDoLine fold
+
+  if !exists('crystal_minlines')
+    let crystal_minlines = 500
+  endif
+  exec 'syn sync minlines=' . crystal_minlines
+
+else
+  syn match crystalControl "\<def\>[?!]\@!"    nextgroup=crystalMethodDeclaration skipwhite skipnl
+  syn match crystalControl "\<fun\>[?!]\@!"    nextgroup=crystalFunctionDeclaration skipwhite skipnl
+  syn match crystalControl "\<class\>[?!]\@!"  nextgroup=crystalClassDeclaration  skipwhite skipnl
+  syn match crystalControl "\<module\>[?!]\@!" nextgroup=crystalModuleDeclaration skipwhite skipnl
+  syn match crystalControl "\<struct\>[?!]\@!" nextgroup=crystalStructDeclaration skipwhite skipnl
+  syn match crystalControl "\<lib\>[?!]\@!"    nextgroup=crystalLibDeclaration skipwhite skipnl
+  syn match crystalControl "\<macro\>[?!]\@!"    nextgroup=crystalMacroDeclaration skipwhite skipnl
+  syn match crystalControl "\<enum\>[?!]\@!"    nextgroup=crystalEnumDeclaration skipwhite skipnl
+  syn match crystalControl "\<\%(case\|begin\|do\|for\|if\|ifdef\|unless\|while\|until\|else\|elsif\|ensure\|then\|when\|end\)\>[?!]\@!"
+  syn match crystalKeyword "\<\%(alias\|undef\)\>[?!]\@!"
+endif
+
+" Link attribute
+syn region crystalLinkAttrRegion start="@\[" nextgroup=crystalLinkAttrRegionInner end="]" contains=crystalLinkAttr,crystalLinkAttrRegionInner transparent display oneline
+syn region crystalLinkAttrRegionInner start="\%(@\[\)\@<=" end="]\@=" contained contains=ALLBUT,@crystalNotTop transparent display oneline
+syn match crystalLinkAttr "@\[" contained containedin=crystalLinkAttrRegion display
+syn match crystalLinkAttr "]" contained containedin=crystalLinkAttrRegion display
+
+" Special Methods
+if !exists('crystal_no_special_methods')
+  syn keyword crystalAccess    protected private
+  " attr is a common variable name
+  syn keyword crystalAttribute getter setter property abstract
+  syn match   crystalControl   "\<\%(abort\|at_exit\|exit\|fork\|loop\)\>[?!]\@!" display
+  syn keyword crystalException raise
+  " false positive with 'include?'
+  syn match   crystalInclude   "\<include\>[?!]\@!" display
+  syn keyword crystalInclude   extend require
+  syn keyword crystalKeyword   caller typeof pointerof sizeof instance_sizeof
+  syn match   crystalRecord    "\<record\>[?!]\@!" display
+endif
+
+" Macro
+syn region crystalMacroRegion start="{%" end="%}" contains=ALLBUT,@crystalNotTop transparent display oneline
+syn region crystalMacroRegion start="{{" end="}}" contains=ALLBUT,@crystalNotTop transparent display oneline
+syn match crystalMacro "\%({%\|%}\|{{\|}}\)" nextgroup=crystalMacroRegion skipwhite display
+
+" Comments and Documentation
+syn match   crystalSharpBang "\%^#!.*" display
+syn keyword crystalTodo	  FIXME NOTE TODO OPTIMIZE XXX todo contained
+syn match   crystalComment   "#.*" contains=crystalSharpBang,crystalSpaceError,crystalTodo,@Spell
+if !exists('crystal_no_comment_fold')
+  syn region crystalMultilineComment start="\%(\%(^\s*#.*\n\)\@<!\%(^\s*#.*\n\)\)\%(\(^\s*#.*\n\)\{1,}\)\@=" end="\%(^\s*#.*\n\)\@<=\%(^\s*#.*\n\)\%(^\s*#\)\@!" contains=crystalComment transparent fold keepend
+endif
+
+" Note: this is a hack to prevent 'keywords' being highlighted as such when called as methods with an explicit receiver
+syn match crystalKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(alias\|begin\|break\|case\|class\|def\|defined\|do\|else\)\>"		  transparent contains=NONE
+syn match crystalKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(elsif\|end\|ensure\|false\|for\|if\|ifdef\|in\|module\|next\|nil\)\>"		  transparent contains=NONE
+syn match crystalKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(rescue\|return\|self\|super\|previous_def\|then\|true\)\>"		  transparent contains=NONE
+syn match crystalKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(undef\|unless\|until\|when\|while\|yield\|with\|__FILE__\|__LINE__\)\>" transparent contains=NONE
+
+syn match crystalKeywordAsMethod "\<\%(alias\|begin\|case\|class\|def\|do\|end\)[?!]" transparent contains=NONE
+syn match crystalKeywordAsMethod "\<\%(if\|ifdef\|module\|undef\|unless\|until\|while\)[?!]" transparent contains=NONE
+
+syn match crystalKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(abort\|at_exit\|caller\|exit\)\>"		transparent contains=NONE
+syn match crystalKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(extend\|fork\|include\)\>"			transparent contains=NONE
+syn match crystalKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(loop\|private\|protected\)\>"		transparent contains=NONE
+syn match crystalKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(require\|raise\)\>"	transparent contains=NONE
+syn match crystalKeywordAsMethod "\%(\%(\.\@<!\.\)\|::\)\_s*\%(typeof\|pointerof\|sizeof\|instance_sizeof\|\)\>"	transparent contains=NONE
+
+hi def link crystalClass			crystalDefine
+hi def link crystalModule			crystalDefine
+hi def link crystalStruct			crystalDefine
+hi def link crystalLib			crystalDefine
+hi def link crystalMacro			crystalDefine
+hi def link crystalEnum			crystalDefine
+hi def link crystalMethodExceptional	crystalDefine
+hi def link crystalDefine			Define
+hi def link crystalFunction		Function
+hi def link crystalConditional		Conditional
+hi def link crystalConditionalModifier	crystalConditional
+hi def link crystalExceptional		crystalConditional
+hi def link crystalRepeat			Repeat
+hi def link crystalRepeatModifier		crystalRepeat
+hi def link crystalOptionalDo		crystalRepeat
+hi def link crystalControl			Statement
+hi def link crystalInclude			Include
+hi def link crystalRecord			Statement
+hi def link crystalInteger			Number
+hi def link crystalASCIICode		Character
+hi def link crystalFloat			Float
+hi def link crystalBoolean			Boolean
+hi def link crystalException		Exception
+if !exists('crystal_no_identifiers')
+  hi def link crystalIdentifier		Identifier
+else
+  hi def link crystalIdentifier		NONE
+endif
+hi def link crystalClassVariable		crystalIdentifier
+hi def link crystalConstant		Type
+hi def link crystalGlobalVariable		crystalIdentifier
+hi def link crystalBlockParameter		crystalIdentifier
+hi def link crystalInstanceVariable	crystalIdentifier
+hi def link crystalFreshVariable	crystalIdentifier
+hi def link crystalPredefinedIdentifier	crystalIdentifier
+hi def link crystalPredefinedConstant	crystalPredefinedIdentifier
+hi def link crystalPredefinedVariable	crystalPredefinedIdentifier
+hi def link crystalSymbol			Constant
+hi def link crystalKeyword			Keyword
+hi def link crystalOperator		Operator
+hi def link crystalAccess			Statement
+hi def link crystalAttribute		Statement
+hi def link crystalPseudoVariable		Constant
+hi def link crystalCharLiteral		Character
+
+hi def link crystalComment			Comment
+hi def link crystalTodo			Todo
+
+hi def link crystalStringEscape		Special
+hi def link crystalInterpolationDelimiter	Delimiter
+hi def link crystalNoInterpolation		crystalString
+hi def link crystalSharpBang		PreProc
+hi def link crystalRegexpDelimiter		crystalStringDelimiter
+hi def link crystalSymbolDelimiter		crystalStringDelimiter
+hi def link crystalStringDelimiter		Delimiter
+hi def link crystalHeredoc			crystalString
+hi def link crystalString			String
+hi def link crystalRegexpEscape		crystalRegexpSpecial
+hi def link crystalRegexpQuantifier	crystalRegexpSpecial
+hi def link crystalRegexpAnchor		crystalRegexpSpecial
+hi def link crystalRegexpDot		crystalRegexpCharClass
+hi def link crystalRegexpCharClass		crystalRegexpSpecial
+hi def link crystalRegexpSpecial		Special
+hi def link crystalRegexpComment		Comment
+hi def link crystalRegexp			crystalString
+
+hi def link crystalLinkAttr		PreProc
+
+hi def link crystalMacro		PreProc
+
+hi def link crystalInvalidVariable		Error
+hi def link crystalError			Error
+hi def link crystalSpaceError		crystalError
+
+let b:current_syntax = 'crystal'
+
+" vim: nowrap sw=2 sts=2 ts=8 noet:
+
+endif