" vim: et sw=2 sts=2

scriptencoding utf-8

" Init: values {{{1
let s:has_doau_modeline = v:version > 703 || v:version == 703 && has('patch442')

" Function: #start {{{1
function! sy#start() abort
  if g:signify_locked
    call sy#verbose('Locked.')
    return
  endif

  let sy_path = resolve(expand('%:p'))

  if s:skip(sy_path)
    call sy#verbose('Skip file.')
    if exists('b:sy')
      call sy#sign#remove_all_signs(bufnr(''))
      unlet! b:sy b:sy_info
    endif
    return
  endif

  " sy_info is used in autoload/sy/repo
  let b:sy_info = {
        \ 'dir':   fnamemodify(sy_path, ':p:h'),
        \ 'path':  sy#util#escape(sy_path),
        \ 'file':  sy#util#escape(fnamemodify(sy_path, ':t')),
        \ }

  if !exists('b:sy') || b:sy.path != sy_path
    call sy#verbose('Register new file.')
    let b:sy = {
          \ 'path':       sy_path,
          \ 'buffer':     bufnr(''),
          \ 'active':     0,
          \ 'detecting':  0,
          \ 'vcs':        [],
          \ 'hunks':      [],
          \ 'signid':     0x100,
          \ 'updated_by': '',
          \ 'stats':      [-1, -1, -1] }
    if get(g:, 'signify_disable_by_default')
      call sy#verbose('Disabled by default.')
      return
    endif
    let b:sy.active = 1
    call sy#repo#detect()
  elseif has('vim_starting')
    call sy#verbose("Don't run Sy more than once during startup.")
    return
  elseif !b:sy.active
    call sy#verbose('Inactive buffer.')
    return
  elseif empty(b:sy.vcs)
    if get(b:sy, 'retry')
      let b:sy.retry = 0
      call sy#verbose('Redetecting VCS.')
      call sy#repo#detect()
    else
      if get(b:sy, 'detecting')
        call sy#verbose('Detection is already in progress.')
      else
        call sy#verbose('No VCS found. Disabling.')
        call sy#disable()
      endif
    endif
  else
    let b:sy.updated_by = ''
    for vcs in b:sy.vcs
      let job_id = get(b:, 'sy_job_id_'. vcs)
      if type(job_id) != type(0) || job_id > 0
        call sy#verbose('Update is already in progress.', vcs)
      else
        call sy#verbose('Updating signs.', vcs)
        call sy#repo#get_diff_start(vcs)
      endif
    endfor
  endif
endfunction

" Function: #set_signs {{{1
function! sy#set_signs(sy, vcs, diff) abort
  call sy#verbose('set_signs()', a:vcs)

  if a:sy.stats == [-1, -1, -1]
    let a:sy.stats = [0, 0, 0]
  endif

  if empty(a:diff)
    call sy#verbose('No changes found.', a:vcs)
    call sy#sign#remove_all_signs(a:sy.buffer)
    return
  endif

  if get(g:, 'signify_line_highlight')
    call sy#highlight#line_enable()
  else
    call sy#highlight#line_disable()
  endif

  call sy#sign#process_diff(a:sy, a:vcs, a:diff)

  if exists('#User#Signify')
    execute 'doautocmd' (s:has_doau_modeline ? '<nomodeline>' : '') 'User Signify'
  endif
endfunction

" Function: #stop {{{1
function! sy#stop(bufnr) abort
  let sy = getbufvar(a:bufnr, 'sy')
  if empty(sy)
    return
  endif

  call sy#sign#remove_all_signs(a:bufnr)
endfunction

" Function: #enable {{{1
function! sy#enable() abort
  if !exists('b:sy')
    call sy#start()
    return
  endif

  if !b:sy.active
    let b:sy.active = 1
    let b:sy.retry  = 1
    call sy#start()
  endif
endfunction

" Function: #disable {{{1
function! sy#disable() abort
  if exists('b:sy') && b:sy.active
    call sy#stop(b:sy.buffer)
    let b:sy.active = 0
    let b:sy.stats = [-1, -1, -1]
  endif
endfunction

" Function: #toggle {{{1
function! sy#toggle() abort
  if !exists('b:sy') || !b:sy.active
    call sy#enable()
  else
    call sy#disable()
  endif
endfunction

" Function: #buffer_is_active {{{1
function! sy#buffer_is_active()
  return exists('b:sy') && b:sy.active
endfunction

" Function: #verbose {{{1
function! sy#verbose(msg, ...) abort
  if &verbose
    echomsg printf('[sy%s] %s', (a:0 ? ':'.a:1 : ''), a:msg)
  endif
endfunction

" Function: s:skip {{{1
function! s:skip(path)
  if &diff || !filereadable(a:path)
    return 1
  endif

  if exists('g:signify_skip_filetype')
    if has_key(g:signify_skip_filetype, &filetype)
      return 1
    elseif has_key(g:signify_skip_filetype, 'help') && (&buftype == 'help')
      return 1
    endif
  endif

  if exists('g:signify_skip_filename') && has_key(g:signify_skip_filename, a:path)
    return 1
  endif

  if exists('g:signify_skip_filename_pattern')
    for pattern in g:signify_skip_filename_pattern
      if a:path =~ pattern
        return 1
      endif
    endfor
  endif

  return 0
endfunction