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Edit File: gitcommit.vim

" Vim filetype plugin
" Language:	git config file
" Maintainer:	Tim Pope <vimNOSPAM@tpope.info>
" Last Change:	2008 Jun 04

" Only do this when not done yet for this buffer
if (exists("b:did_ftplugin"))
  finish
endif

runtime! ftplugin/git.vim
let b:did_ftplugin = 1

if &textwidth == 0
  " make sure that log messages play nice with git-log on standard terminals
  setlocal textwidth=72
  if !exists("b:undo_ftplugin")
      let b:undo_ftplugin = ""
  endif
  let b:undo_ftplugin = b:undo_ftplugin . "|setl tw<"
endif

if exists("g:no_gitcommit_commands") || v:version < 700
  finish
endif

if !exists("b:git_dir")
    let b:git_dir = expand("%:p:h")
endif

" Automatically diffing can be done with:
"   autocmd FileType gitcommit DiffGitCached | wincmd p
command! -bang -bar -buffer -complete=custom,s:diffcomplete -nargs=* DiffGitCached :call s:gitdiffcached(<bang>0,b:git_dir,<f-args>)

function! s:diffcomplete(A,L,P)
    let args = ""
    if a:P <= match(a:L." -- "," -- ")+3
        let args = args . "-p\n--stat\n--shortstat\n--summary\n--patch-with-stat\n--no-renames\n-B\n-M\n-C\n"
    end
    if exists("b:git_dir") && a:A !~ '^-'
        let tree = fnamemodify(b:git_dir,':h')
        if strpart(getcwd(),0,strlen(tree)) == tree
            let args = args."\n".system("git diff --cached --name-only")
        endif
    endif
    return args
endfunction

function! s:gitdiffcached(bang,gitdir,...)
    let tree = fnamemodify(a:gitdir,':h')
    let name = tempname()
    let git = "git"
    if strpart(getcwd(),0,strlen(tree)) != tree
        let git .= " --git-dir=".(exists("*shellescape") ? shellescape(a:gitdir) : '"'.a:gitdir.'"')
    endif
    if a:0
        let extra = join(map(copy(a:000),exists("*shellescape") ? 'shellescape(v:val)' : "'\"'.v:val.'\"'"))
    else
        let extra = "-p --stat=".&columns
    endif
    call system(git." diff --cached --no-color ".extra." > ".(exists("*shellescape") ? shellescape(name) : name))
    exe "pedit ".(exists("*fnameescape") ? fnameescape(name) : name)
    wincmd P
    let b:git_dir = a:gitdir
    command! -bang -bar -buffer -complete=custom,s:diffcomplete -nargs=* DiffGitCached :call s:gitdiffcached(<bang>0,b:git_dir,<f-args>)
    nnoremap <silent> q :q<CR>
    setlocal buftype=nowrite nobuflisted noswapfile nomodifiable filetype=git
endfunction

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