[PATCH] Nice ftplugin for vim, that shows the commited diff in a split'ed buffer.

[Pierre Habouzit <madcoder@debian.org>]

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
---
 contrib/vim/README                 |   10 +++++
 contrib/vim/ftplugin/gitcommit.vim |   75 ++++++++++++++++++++++++++++++++++++
 2 files changed, 85 insertions(+), 0 deletions(-)

diff --git a/contrib/vim/README b/contrib/vim/README
index 9e7881f..e5ca9ae 100644
--- a/contrib/vim/README
+++ b/contrib/vim/README
@@ -6,3 +6,13 @@ To syntax highlight git's commit message
      $ cat >>$HOME/.vimrc <<'EOF'
      autocmd BufNewFile,BufRead COMMIT_EDITMSG set filetype=gitcommit
      EOF
+
+To use the fancy split-view with the currently commited diff, you need to:
+  1. Copy ftplugin/gitcommit.vim to vim's ftplugin directory:
+     $ mkdir -p $HOME/.vim/ftplugin
+     $ cp ftplugin/gitcommit.vim $HOME/.vim/ftplugin
+  2. Auto-detect the editing of git commit files (see above).
+  3. You can configure the diff to spawn automatically by setting:
+     let git_diff_spawn_mode = 1 (or 2) for an horiz (resp. vert) split.
+     else you have the bindings ,gd or ,ghd to spawn an horiz split with
+     the diff, and ,gvd for the same with a vertical diff.
diff --git a/contrib/vim/ftplugin/gitcommit.vim b/contrib/vim/ftplugin/gitcommit.vim
new file mode 100644
index 0000000..a9cb946
--- /dev/null
+++ b/contrib/vim/ftplugin/gitcommit.vim
@@ -0,0 +1,75 @@
+if exists("b:did_ftplugin")
+  finish
+endif
+
+let b:did_ftplugin = 1
+
+setlocal tw=74
+setlocal nowarn nowb
+
+"{{{ function Git_diff_windows
+
+function! Git_diff_windows(vertsplit, auto)
+    let i = 0
+    let list_of_files = ''
+
+    " drop everything until '#  (will commit)' and the next empty line
+    while i <= line('$')
+        let line = getline(i)
+        if line =~ '^#\s*(will commit)$'
+            let i = i + 2
+            break
+        endif
+
+        let i = i + 1
+    endwhile
+
+    " read file names until we have EOF or an empty line
+    while i <= line('$')
+        let line = getline(i)
+        if line =~ '^#\s*[a-z ]*:.*->.*$'
+            let file = substitute(line, '\v^#[^:]*:.*->\s*(.*)\s*$', '\1', '')
+            let list_of_files = list_of_files . ' '.file
+            let file = substitute(line, '\v^#[^:]*:\s*(.*)\s*->.*$', '\1', '')
+            let list_of_files = list_of_files . ' '.file
+        elseif line =~ '^#\s*[a-z ]*:'
+            let file = substitute(line, '\v^#[^:]*:\s*(.*)\s*$', '\1', '')
+            let list_of_files = list_of_files . ' '.file
+        elseif line =~ '^#\s*$'
+            break
+        endif
+
+        let i = i + 1
+    endwhile
+
+    if list_of_files == ""
+        return
+    endif
+
+    if a:vertsplit
+        rightbelow vnew
+    else
+        rightbelow new
+    endif
+    silent! setlocal ft=diff previewwindow bufhidden=delete nobackup noswf nobuflisted nowrap buftype=nofile
+    exe 'normal :r!LANG=C cd ..; git diff HEAD -- ' . list_of_files . "\n1Gdd"
+    exe 'normal :r!LANG=C cd ..; git diff HEAD -- ' . list_of_files . " \| git apply --stat\no\<esc>1GddO\<esc>"
+    setlocal nomodifiable
+    if a:auto
+        redraw!
+        wincmd p
+        redraw!
+    endif
+endfunction
+
+"}}}
+
+noremap <buffer> ,gd :call Git_diff_windows(0, 0)<cr>
+noremap <buffer> ,ghd :call Git_diff_windows(0, 0)<cr>
+noremap <buffer> ,gvd :call Git_diff_windows(1, 0)<cr>
+
+if g:git_diff_spawn_mode == 1
+    call Git_diff_windows(0, 1)
+elseif g:git_diff_spawn_mode == 2
+    call Git_diff_windows(1, 1)
+endif
-- 
1.4.2.3