From 586fb4aa1743f69e6e388f5625d5f9dd9a297a25 Mon Sep 17 00:00:00 2001
From: Teddy Wing
Date: Thu, 27 Apr 2017 23:38:42 +0200
Subject: Sample completion function

Copy the completion function included in `:h complete-functions` to
give us a base custom completion function to work from. We'll be using
this to provide completion for Git SHAs.
---
 ftplugin/gitcommit.vim | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 ftplugin/gitcommit.vim

diff --git a/ftplugin/gitcommit.vim b/ftplugin/gitcommit.vim
new file mode 100644
index 0000000..592e67e
--- /dev/null
+++ b/ftplugin/gitcommit.vim
@@ -0,0 +1,21 @@
+function! GitSHAComplete(findstart, base)
+	if a:findstart
+		" locate the start of the word
+		let line = getline('.')
+		let start = col('.') - 1
+		while start > 0 && line[start - 1] =~ '\a'
+			let start -= 1
+		endwhile
+		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
+endfunction
+set completefunc=GitSHAComplete
-- 
cgit v1.2.3