Convert git-log to changlog day by day

changlog

#!/bin/bash
# Generates changelog day by day
#
# Defaults
#
VERSION="0.1"
AUTHOR="icyleaf <[email protected]>"

#
# Variables
#
GIT_AUTHOR=""
GIT_ONLY_TODAY=0

#
# Functions
#
usage() {
	echo "Usage: changlog [<options>]"
	echo "See 'changlog --help'."
	exit 0
}

usage_long() {
less << EOF
USAGE
	changlog [<options>]

DESCRIPTION
	Convert git log to changlog.

OPTIONS
	If no options is specified, the changlog will render all changlog from day by day.

OPTIONS
	-h, --help	Show this help
	-a, --author	Limit the commits output to ones with author/committer header lines that match the specified pattern 
	-t, --today 	Only render today changlog
	--version	Print current changlog version

EXAMPLES
	. changloa -a lcyleaf
	. kohana -a icyleaf -t

VERSION
	$VERSION

AUTHOR
	$AUTHOR
EOF
exit 0
}

changlog() {
	if [ ! -z $GIT_AUTHOR]; then
		$GIT_AUTHOR=" --author=$GIT_AUTHOR";
	fi
	
	if test -d ".git"; then
	
		NEXT=$(date +%F)
		echo "CHANGELOG"
		echo ----------------------
		git log --no-merges --format="%cd" --date=short | sort -u -r | while read DATE ; do
	    	echo
	    	echo [$DATE]
	    	GIT_PAGER=cat git log --no-merges --format=" * %s" $GIT_AUTHOR --since=$DATE --until=$NEXT
	    	NEXT=$DATE
		done
	else
		echo "No git repository present."
	fi
}

# Parse parameters
while test $# != 0; do
	case "$1" in
		-h|--help)
			usage_long
			;;
		-a|--author*)
			INSTALL_SKELETON=1
			;;
		-t|--today)
			INSTALL_SKELETON=0
			;;
		--version)
			echo "changlog version $VERSION"
			exit 0
			;;
		*)
			usage
	esac
	shift
done
changlog