if exists('g:loaded_gitgutter') || !executable('git') || !has('signs') || &cp
  finish
endif
let g:loaded_gitgutter = 1

" Initialisation {{{

" Realtime sign updates require Vim 7.3.105+.
if v:version < 703 || (v:version == 703 && !has("patch105"))
  let g:gitgutter_realtime = 0
endif

" Eager updates require gettabvar()/settabvar().
if !exists("*gettabvar")
  let g:gitgutter_eager = 0
endif

function! s:set(var, default)
  if !exists(a:var)
    if type(a:default)
      execute 'let' a:var '=' string(a:default)
    else
      execute 'let' a:var '=' a:default
    endif
  endif
endfunction

call s:set('g:gitgutter_enabled',               1)
call s:set('g:gitgutter_signs',                 1)
call s:set('g:gitgutter_highlight_lines',       0)
call s:set('g:gitgutter_sign_column_always',    0)
call s:set('g:gitgutter_realtime',              1)
call s:set('g:gitgutter_eager',                 1)
call s:set('g:gitgutter_sign_added',            '+')
call s:set('g:gitgutter_sign_modified',         '~')
call s:set('g:gitgutter_sign_removed',          '_')
call s:set('g:gitgutter_sign_modified_removed', '~_')
call s:set('g:gitgutter_diff_args',             '')
call s:set('g:gitgutter_escape_grep',           0)
call s:set('g:gitgutter_map_keys',              1)

call highlight#define_sign_column_highlight()
call highlight#define_highlights()
call highlight#define_signs()

" }}}

" Primary functions {{{

command GitGutterAll call gitgutter#all()
command GitGutter    call gitgutter#process_buffer(utility#current_file(), 0)

command GitGutterDisable call gitgutter#disable()
command GitGutterEnable  call gitgutter#enable()
command GitGutterToggle  call gitgutter#toggle()

" }}}

" Line highlights {{{

command GitGutterLineHighlightsDisable call gitgutter#line_highlights_disable()
command GitGutterLineHighlightsEnable  call gitgutter#line_highlights_enable()
command GitGutterLineHighlightsToggle  call gitgutter#line_highlights_toggle()

" }}}

" Signs {{{

command GitGutterSignsEnable  call gitgutter#signs_enable()
command GitGutterSignsDisable call gitgutter#signs_disable()
command GitGutterSignsToggle  call gitgutter#signs_toggle()

" }}}

" Hunks {{{

command -count=1 GitGutterNextHunk call hunk#next_hunk(<count>)
command -count=1 GitGutterPrevHunk call hunk#prev_hunk(<count>)

command GitGutterStageHunk   call gitgutter#stage_hunk()
command GitGutterRevertHunk  call gitgutter#revert_hunk()
command GitGutterPreviewHunk call gitgutter#preview_hunk()

" Returns the git-diff hunks for the file or an empty list if there
" aren't any hunks.
"
" The return value is a list of lists.  There is one inner list per hunk.
"
"   [
"     [from_line, from_count, to_line, to_count],
"     [from_line, from_count, to_line, to_count],
"     ...
"   ]
"
" where:
"
" `from`  - refers to the staged file
" `to`    - refers to the working tree's file
" `line`  - refers to the line number where the change starts
" `count` - refers to the number of lines the change covers
function! GitGutterGetHunks()
  return utility#is_active() ? hunk#hunks() : []
endfunction

" Returns an array that contains a summary of the current hunk status.
" The format is [ added, modified, removed ], where each value represents
" the number of lines added/modified/removed respectively.
function! GitGutterGetHunkSummary()
  return hunk#summary()
endfunction

" }}}

command GitGutterDebug call debug#debug()

" Maps {{{

nnoremap <silent> <expr> <Plug>GitGutterNextHunk &diff ? ']c' : ":\<C-U>execute v:count1 . 'GitGutterNextHunk'\<CR>"
nnoremap <silent> <expr> <Plug>GitGutterPrevHunk &diff ? '[c' : ":\<C-U>execute v:count1 . 'GitGutterPrevHunk'\<CR>"

if g:gitgutter_map_keys
  if !hasmapto('<Plug>GitGutterPrevHunk') && maparg('[c', 'n') ==# ''
    nmap [c <Plug>GitGutterPrevHunk
  endif
  if !hasmapto('<Plug>GitGutterNextHunk') && maparg(']c', 'n') ==# ''
    nmap ]c <Plug>GitGutterNextHunk
  endif
endif


nnoremap <silent> <Plug>GitGutterStageHunk   :GitGutterStageHunk<CR>
nnoremap <silent> <Plug>GitGutterRevertHunk  :GitGutterRevertHunk<CR>
nnoremap <silent> <Plug>GitGutterPreviewHunk :GitGutterPreviewHunk<CR>

if g:gitgutter_map_keys
  if !hasmapto('<Plug>GitGutterStageHunk') && maparg('<Leader>hs', 'n') ==# ''
    nmap <Leader>hs <Plug>GitGutterStageHunk
  endif
  if !hasmapto('<Plug>GitGutterRevertHunk') && maparg('<Leader>hr', 'n') ==# ''
    nmap <Leader>hr <Plug>GitGutterRevertHunk
  endif
  if !hasmapto('<Plug>GitGutterPreviewHunk') && maparg('<Leader>hp', 'n') ==# ''
    nmap <Leader>hp <Plug>GitGutterPreviewHunk
  endif
endif

" }}}

" Autocommands {{{

augroup gitgutter
  autocmd!

  if g:gitgutter_realtime
    autocmd CursorHold,CursorHoldI * call gitgutter#process_buffer(utility#current_file(), 1)
  endif

  if g:gitgutter_eager
    autocmd BufEnter,BufWritePost,FileChangedShellPost *
          \  if gettabvar(tabpagenr(), 'gitgutter_didtabenter')
          \|   call settabvar(tabpagenr(), 'gitgutter_didtabenter', 0)
          \| else
          \|   call gitgutter#process_buffer(utility#current_file(), 0)
          \| endif
    autocmd TabEnter *
          \  call settabvar(tabpagenr(), 'gitgutter_didtabenter', 1)
          \| call gitgutter#all()
    if !has('gui_win32')
      autocmd FocusGained * call gitgutter#all()
    endif
  else
    autocmd BufRead,BufWritePost,FileChangedShellPost * call gitgutter#process_buffer(utility#current_file(), 0)
  endif

  autocmd ColorScheme * call highlight#define_sign_column_highlight() | call highlight#define_highlights()

  " Disable during :vimgrep
  autocmd QuickFixCmdPre  *vimgrep* let g:gitgutter_enabled = 0
  autocmd QuickFixCmdPost *vimgrep* let g:gitgutter_enabled = 1
augroup END

" }}}

" vim:set et sw=2 fdm=marker: