From 1e337bc9052be40e7ad0da62761b3256542f15d0 Mon Sep 17 00:00:00 2001
From: Lex Neva <lexelby@users.noreply.github.com>
Date: Thu, 1 Mar 2018 20:06:45 -0500
Subject: [PATCH] don't commit messages.po if only POT-Creation-Date changed
 (#114)

---
 git-hooks/pre-commit | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/git-hooks/pre-commit b/git-hooks/pre-commit
index f01b516ea..99f59729e 100755
--- a/git-hooks/pre-commit
+++ b/git-hooks/pre-commit
@@ -1,4 +1,14 @@
 #!/bin/bash
 
-make messages.po | grep -v 'is up to date\.$'
-git add messages.po
+make messages.po > /dev/null 2>&1
+
+# This monstrosity asks how many lines changed, but it ignores changes to the
+# "POT-Creation-Date" line.  In other words, if all that's changed is the
+# "POT-Creation-Date", don't bother adding messages.po
+lines_changed=$(git -c difftool.ignorepot.cmd='diff -u -I "POT-Creation-Date" "$LOCAL" "$REMOTE"' difftool -t ignorepot -y messages.po | wc -l)
+
+if [ "$lines_changed" = 0 ]; then
+    git checkout messages.po
+else
+    git add messages.po
+fi