Prepend issue number (from branch name) to commit message

prepare-commit-msg

#!/bin/sh
#
# Automatically add branch name and branch description to every commit message
# except merge commit.
#

COMMIT_EDITMSG=$1

addBranchName() {
  BRANCH_NAME=$(git symbolic-ref --short HEAD)
  STORY_NUMBER=$(echo $BRANCH_NAME | sed -n 's/^\([0-9]*\)-.*/\1/p')
  if [ $STORY_NUMBER ] ; then
    echo "[#$STORY_NUMBER] $(cat $COMMIT_EDITMSG)" > $COMMIT_EDITMSG
  fi
}

MERGE=$(cat $COMMIT_EDITMSG|grep -i 'merge'|wc -l)

if [ $MERGE -eq 0 ] ; then
  addBranchName
fi