if exists('b:autoloaded_sy_repo')
  finish
endif
let b:autoloaded_sy_repo = 1

" Init: values {{{1
if !empty(get(g:, 'signify_difftool'))
  let s:difftool = g:signify_difftool
else
  if has('win32')
    if $VIMRUNTIME =~ ' '
      let s:difftool = (&sh =~ '\<cmd')
            \ ? ('"'. $VIMRUNTIME .'\diff"')
            \ : (substitute($VIMRUNTIME, ' ', '" ', '') .'\diff"')
    else
      let s:difftool = $VIMRUNTIME .'\diff'
    endif
  else
    if !executable('diff')
      echomsg 'signify: No diff tool found!'
      finish
    endif
    let s:difftool = 'diff'
  endif
endif

let s:diffoptions = get(g:, 'signify_diffoptions', {})

" Function: #detect {{{1
function! sy#repo#detect(path) abort
  for type in get(g:, 'signify_vcs_list', [ 'git', 'hg', 'svn', 'darcs', 'bzr', 'fossil', 'cvs', 'rcs', 'accurev', 'perforce' ])
    let diff = sy#repo#get_diff_{type}(a:path)
    if !empty(diff)
      return [ diff, type ]
    endif
  endfor

  return [ '', '' ]
endfunction

" Function: #get_diff_git {{{1
function! sy#repo#get_diff_git(path) abort
  let diffoptions = has_key(s:diffoptions, 'git') ? s:diffoptions.git : ''
  let diff = system('cd '. sy#util#escape(fnamemodify(a:path, ':h')) .' && git diff --no-ext-diff -U0 '. diffoptions .' -- '. sy#util#escape(a:path))
  return v:shell_error ? '' : diff
endfunction

" Function: #get_stat_git {{{1
function! sy#repo#get_stat_git() abort
  let s:stats = []
  let root  = finddir('.git', fnamemodify(g:sy_path, ':h') .';')
  if empty(root)
    echohl ErrorMsg | echomsg 'Cannot find the git root directory: '. g:sy_path | echohl None
    return
  endif
  let root   = fnamemodify(root, ':h')
  let output = system('cd '. sy#util#escape(root) .' && git diff --numstat')
  if v:shell_error
    echohl ErrorMsg | echomsg "'git diff --numstat' failed" | echohl None
    return
  endif
  for stat in split(output, '\n')
    let tokens = matchlist(stat, '\v([0-9-]+)\t([0-9-]+)\t(.*)')
    if empty(tokens)
      echohl ErrorMsg | echomsg 'Cannot parse this line: '. stat | echohl None
    elseif tokens[1] == '-'
      continue
    else
      let path = root . sy#util#separator() . tokens[3]
      if !bufexists(path)
        execute 'argadd '. path
      endif
      call add(s:stats, { 'bufnr': bufnr(path), 'text': tokens[1] .' additions, '. tokens[2] .' deletions', 'lnum': 1, 'col': 1 })
    endif
  endfor
  "call setqflist(stats)
endfunction

" Function: #get_diff_hg {{{1
function! sy#repo#get_diff_hg(path) abort
  let diffoptions = has_key(s:diffoptions, 'hg') ? s:diffoptions.hg : ''
  let diff = system('hg diff --nodates -U0 '. diffoptions .' -- '. sy#util#escape(a:path))
  return v:shell_error ? '' : diff
endfunction

" Function: #get_diff_svn {{{1
function! sy#repo#get_diff_svn(path) abort
  let diffoptions = has_key(s:diffoptions, 'svn') ? s:diffoptions.svn : ''
  let diff = system('svn diff --diff-cmd '. s:difftool .' -x -U0 '. diffoptions .' -- '. sy#util#escape(a:path))
  return v:shell_error ? '' : diff
endfunction

" Function: #get_diff_bzr {{{1
function! sy#repo#get_diff_bzr(path) abort
  let diffoptions = has_key(s:diffoptions, 'bzr') ? s:diffoptions.bzr : ''
  let diff = system('bzr diff --using '. s:difftool .' --diff-options=-U0 '. diffoptions .' -- '. sy#util#escape(a:path))
  return ((v:shell_error == 0) || (v:shell_error == 1) || (v:shell_error == 2)) ? diff : ''
endfunction

" Function: #get_diff_darcs {{{1
function! sy#repo#get_diff_darcs(path) abort
  let diffoptions = has_key(s:diffoptions, 'darcs') ? s:diffoptions.darcs : ''
  let diff = system('cd '. sy#util#escape(fnamemodify(a:path, ':h')) .' && darcs diff --no-pause-for-gui --diff-command="'. s:difftool .' -U0 %1 %2 '. diffoptions .'" -- '. sy#util#escape(a:path))
  return v:shell_error ? '' : diff
endfunction

" Function: #get_diff_fossil {{{1
function! sy#repo#get_diff_fossil(path) abort
  let diffoptions = has_key(s:diffoptions, 'fossil') ? s:diffoptions.fossil : ''
  let diff = system('cd '. sy#util#escape(fnamemodify(a:path, ':h')) .' && fossil set diff-command "'. s:difftool .' -U 0" && fossil diff --unified -c 0 '. diffoptions .' -- '. sy#util#escape(a:path))
  return v:shell_error ? '' : diff
endfunction

" Function: #get_diff_cvs {{{1
function! sy#repo#get_diff_cvs(path) abort
  let diffoptions = has_key(s:diffoptions, 'cvs') ? s:diffoptions.cvs : ''
  let diff = system('cd '. sy#util#escape(fnamemodify(a:path, ':h')) .' && cvs diff -U0 '. diffoptions .' -- '. sy#util#escape(fnamemodify(a:path, ':t')))
  return v:shell_error ? '' : diff
endfunction

" Function: #get_diff_rcs {{{1
function! sy#repo#get_diff_rcs(path) abort
  let diffoptions = has_key(s:diffoptions, 'rcs') ? s:diffoptions.rcs : ''
  let diff = system('rcsdiff -U0 '. diffoptions .' '. sy#util#escape(a:path) .' 2>/dev/null')
  return v:shell_error ? '' : diff
endfunction

" Function: #get_diff_accurev {{{1
function! sy#repo#get_diff_accurev(path) abort
  let diffoptions = has_key(s:diffoptions, 'accurev') ? s:diffoptions.accurev : ''
  let diff = system('cd '. sy#util#escape(fnamemodify(a:path, ':h')) .' && accurev diff '. sy#util#escape(fnamemodify(a:path, ':t')) . ' -- -U0 '. diffoptions)
  return (v:shell_error != 1) ? '' : diff
endfunction

" Function: #get_diff_perforce {{{1
function! sy#repo#get_diff_perforce(path) abort
  let diffoptions = has_key(s:diffoptions, 'perforce') ? s:diffoptions.perforce : ''
  let diff = system('env P4DIFF=diff p4 diff -dU0 '. diffoptions .' -- '. sy#util#escape(a:path))
  return v:shell_error ? '' : diff
endfunction

" Function: #process_diff {{{1
function! sy#repo#process_diff(path, diff) abort
  " Determine where we have to put our signs.
  for line in filter(split(a:diff, '\n'), 'v:val =~ "^@@ "')
    let tokens = matchlist(line, '^@@ -\v(\d+),?(\d*) \+(\d+),?(\d*)')

    let [ old_line, old_count, new_line, new_count ] = [ str2nr(tokens[1]), empty(tokens[2]) ? 1 : str2nr(tokens[2]), str2nr(tokens[3]), empty(tokens[4]) ? 1 : str2nr(tokens[4]) ]

    let signs = []

    " 2 lines added:

    " @@ -5,0 +6,2 @@ this is line 5
    " +this is line 5
    " +this is line 5

    if (old_count == 0) && (new_count >= 1)
      let offset = 0
      while offset < new_count
        call add(signs, { 'type': 'SignifyAdd', 'lnum': new_line + offset, 'path': a:path })
        let offset += 1
      endwhile

      " 2 lines removed:

      " @@ -6,2 +5,0 @@ this is line 5
      " -this is line 6
      " -this is line 7

    elseif (old_count >= 1) && (new_count == 0)
      if new_line == 0
        call add(signs, { 'type': 'SignifyDeleteFirstLine', 'lnum': 1, 'path': a:path })
      else
        call add(signs, { 'type': (old_count > 9) ? 'SignifyDeleteMore' : 'SignifyDelete'. old_count, 'lnum': new_line, 'path': a:path })
      endif

      " 2 lines changed:

      " @@ -5,2 +5,2 @@ this is line 4
      " -this is line 5
      " -this is line 6
      " +this os line 5
      " +this os line 6

    elseif old_count == new_count
      let offset = 0
      while offset < new_count
        call add(signs, { 'type': 'SignifyChange', 'lnum': new_line + offset, 'path': a:path })
        let offset += 1
      endwhile
    else

      " 2 lines changed; 2 lines deleted:

      " @@ -5,4 +5,2 @@ this is line 4
      " -this is line 5
      " -this is line 6
      " -this is line 7
      " -this is line 8
      " +this os line 5
      " +this os line 6

      if old_count > new_count
        let offset = 0
        while offset < (new_count - 1)
          call add(signs, { 'type': 'SignifyChange', 'lnum': new_line + offset, 'path': a:path })
          let offset += 1
        endwhile
        let deleted = old_count - new_count
        call add(signs, { 'type': (deleted > 9) ? 'SignifyChangeDeleteMore' : 'SignifyChangeDelete'. deleted, 'lnum': new_line, 'path': a:path })

        " lines changed and added:

        " @@ -5 +5,3 @@ this is line 4
        " -this is line 5
        " +this os line 5
        " +this is line 42
        " +this is line 666

      else
        let offset = 0
        while offset < old_count
          call add(signs, { 'type': 'SignifyChange', 'lnum': new_line + offset, 'path': a:path })
          let offset += 1
        endwhile
        while offset < new_count
          call add(signs, { 'type': 'SignifyAdd', 'lnum': new_line + offset, 'path': a:path })
          let offset += 1
        endwhile
      endif
    endif
    call sy#sign#set(signs)
  endfor
endfunction

" vim: et sw=2 sts=2