ftplugin/gitcommit.vim: Make completion work for commit SHAs

Get the list of SHAs from `git rev-list` and use this for
completion. Not too different from the original structure.

Renamed `res` to `matches` because that seemed clearer to me.

1 files changed, 11 insertions, 8 deletions

diff --git a/ftplugin/gitcommit.vim b/ftplugin/gitcommit.vim
index 592e67e..daed923 100644
--- a/ftplugin/gitcommit.vim
+++ b/ftplugin/gitcommit.vim
@@ -9,13 +9,16 @@ function! GitSHAComplete(findstart, base)
 		return start
 	endif
 
-	    " find months matching with "a:base"
-	    let res = []
-	    for m in split("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec")
-	      if m =~ '^' . a:base
-		call add(res, m)
-	      endif
-	    endfor
-	    return res
+	" Match Git SHAs in the current repository
+	let matches = []
+	let revs = system('git rev-list --all')
+	for m in split(revs)
+		if m =~ '^' . a:base
+			call add(matches, m)
+		endif
+	endfor
+
+	return matches
 endfunction
+
 set completefunc=GitSHAComplete