1 files changed, 57 insertions, 0 deletions
diff --git a/runtime/ftplugin/gitcommit.vim b/runtime/ftplugin/gitcommit.vim
new file mode 100644
index 0000000..9342799
--- /dev/null
+++ b/runtime/ftplugin/gitcommit.vim
@@ -0,0 +1,57 @@
+" Vim filetype plugin
+" Language:	git commit file
+" Maintainer:	Tim Pope <vimNOSPAM@tpope.org>
+" Last Change:	2022 Jan 05
+
+" Only do this when not done yet for this buffer
+if (exists("b:did_ftplugin"))
+  finish
+endif
+
+let b:did_ftplugin = 1
+
+setlocal nomodeline tabstop=8 formatoptions+=tl textwidth=72
+setlocal formatoptions-=c formatoptions-=r formatoptions-=o formatoptions-=q formatoptions+=n
+setlocal formatlistpat+=\\\|^\\s*[-*+]\\s\\+
+setlocal include=^+++
+setlocal includeexpr=substitute(v:fname,'^[bi]/','','')
+
+let b:undo_ftplugin = 'setl modeline< tabstop< formatoptions< tw< com< cms< formatlistpat< inc< inex<'
+
+let s:l = search('\C\m^[#;@!$%^&|:] -\{24,\} >8 -\{24,\}$', 'cnW', '', 100)
+let &l:comments = ':' . (matchstr(getline(s:l ? s:l : '$'), '^[#;@!$%^&|:]\S\@!') . '#')[0]
+let &l:commentstring = &l:comments[1] . ' %s'
+unlet s:l
+
+if exists("g:no_gitcommit_commands")
+  finish
+endif
+
+command! -bang -bar -buffer -complete=custom,s:diffcomplete -nargs=* DiffGitCached :call s:gitdiffcached(<bang>0, <f-args>)
+
+let b:undo_ftplugin = b:undo_ftplugin . "|delc DiffGitCached"
+
+function! s:diffcomplete(A, L, P) abort
+  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 a:A !~ '^-' && !empty(getftype('.git'))
+    let args = args."\n".system("git diff --cached --name-only")
+  endif
+  return args
+endfunction
+
+function! s:gitdiffcached(bang, ...) abort
+  let name = tempname()
+  if a:0
+    let extra = join(map(copy(a:000), 'shellescape(v:val)'))
+  else
+    let extra = "-p --stat=".&columns
+  endif
+  call system("git diff --cached --no-color --no-ext-diff ".extra." > ".shellescape(name))
+  exe "pedit " . fnameescape(name)
+  wincmd P
+  command! -bang -bar -buffer -complete=custom,s:diffcomplete -nargs=* DiffGitCached :call s:gitdiffcached(<bang>0, <f-args>)
+  setlocal buftype=nowrite nobuflisted noswapfile nomodifiable filetype=git
+endfunction