From f2a41c54b1a2d64cf09c537308976392e8a403b7 Mon Sep 17 00:00:00 2001
From: Sasha Khamkov <sanusart@gmail.com>
Date: Sun, 6 Apr 2014 00:10:08 +0300
Subject: [PATCH] Add check for no changes in the tree (no sub-modules)

---
 bin/git-changelog | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/bin/git-changelog b/bin/git-changelog
index f109dcc..2d00cc8 100755
--- a/bin/git-changelog
+++ b/bin/git-changelog
@@ -5,6 +5,11 @@ LIST=false
 TAG="n.n.n"
 GIT_LOG_OPTS=""
 
+if git diff-index --quiet --ignore-submodules HEAD --; then
+    echo 'No changes to log.';
+    exit 1;
+fi
+
 while [ "$1" != "" ]; do
   case $1 in
     -l | --list )