customize git commit message

prepare-commit-msg

#!/bin/sh
#
# 
# Customize the commit message:
# * Remove the list of untracked files
# * Add lines from diff of lines added and deleted
#
# Put this file in
# .git/hooks/prepare-commit-msg
#



case "$2,$3" in
  merge,)
    /usr/bin/perl -i.bak -ne 's/^/# /, s/^# #/#/ if /^Conflicts/ .. /#/; print' "$1" ;;

  *) ;;
esac


# customize message format
if [ "$2" == "" ] ; then
	#echo "" >> "$1"
	# Remove untracked files section
	sed -i -e '/^# Untracked files:/,$ d' "$1"
	# Print diff stat
	#git diff --staged --stat 2>/dev/null | sed -e 's/^/#/' >> "$1" 2>/dev/null
	echo "#" >> "$1"
	echo "# Added Lines:" >> "$1"
	git diff --staged -p -U0 --no-prefix -b 2> /dev/null | \
	sed -n -e 's/^+++ \(.*\)/#    \1:/p; s/^[+]/#&/p; s/^@@.*/#@@/p' >> "$1"  2>/dev/null

	echo "#" >> "$1"
	echo "# Deleted Lines:" >> "$1"
	git diff --staged -p -U0 --no-prefix -b 2> /dev/null | \
	sed -n -e 's/^--- \(.*\)/#    \1:/p; s/^[-]/#&/p; s/^@@.*/#@@/p' >> "$1"  2>/dev/null
fi

Z example commit message

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch master
# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#       modified:   src/taikonome/Taikonome.as
#       modified:   taikonome.as3proj
#
#
# Added Lines:
#    src/taikonome/Taikonome.as:
#@@
#+      import flash.net.URLVariables;
#@@
#+              protected var _tempoSlider:HUISlider
#+              protected var _volumeSlider:HUISlider
#@@
#+              protected var _hashChangeTimer:uint = 0;
#+              protected var _varChangeTimer:uint = 0;
#
# Deleted Lines:
#    src/taikonome/Taikonome.as:
#@@
#@@
#-              protected var _slider:HUISlider
#-              protected var _volume:HUISlider
#@@
#-              protected var _hashChangeTime:uint = 0;