added changelog release script

dist/make_changelog.sh

@@ -0,0 +1,96 @@
+#!/usr/bin/env bash
+
+old_tag=
+new_tag=
+regen=0
+
+usage() {
+cat << EOF
+Usage: $0 [opts]
+
+OPTS:
+  -h This help text
+  -F Regenerate the entire ChangeLog
+  -o Old git tag (default action is to automagically find your last tag)
+  -n New git tag (default action is to use git-flow release to find your new tag name)
+EOF
+}
+
+while getopts "hFo:n:" OPTION
+do
+	case $OPTION in
+		h)
+			usage
+			exit 0
+			;;
+		F)
+			regen=1
+			;;
+		o)
+			old_tag=$OPTARG
+			;;
+		n)
+			new_tag=$OPTARG
+			;;
+		?)
+			echo "No such option $OPTARG"
+			usage
+			exit -1
+			;;
+	esac
+done
+
+function generate_changelog() {
+	old=$1
+	new=$2
+
+	git --no-pager log --no-merges --reverse --pretty='format: o %s (%h %an)' $old..$new
+	echo ""
+	echo ""
+}
+
+use_head=0
+
+if [ -z $old_tag ]
+then
+	l_sha=`git rev-list --tags --max-count=1..HEAD`
+	old_tag=`git describe --tags $l_sha`
+fi
+
+if [ -z $new_tag ]
+then
+	new_tag=`git flow release | awk '{print $2}'`
+	use_head=1
+fi
+
+echo v$new_tag
+
+if [ $use_head -eq 1 ]
+then
+	generate_changelog $old_tag HEAD
+fi
+
+if [ $regen -eq 1 ]
+then
+	tags=()
+
+	for tag in `git for-each-ref --sort='*authordate' --format='%(refname)' refs/tags | awk -F/ '{print $3}'` ; do
+		tags+=("$tag")
+	done
+
+	last_tag=
+
+	for ((i=${#tags[@]-1}; i>=0; i--)); do
+		if [ -z $last_tag ]
+		then
+			last_tag=${tags[$i]}
+			continue
+		fi
+
+		echo v${tags[$i]}
+
+		generate_changelog ${tags[$i]} $last_tag
+
+		last_tag=${tags[$i]}
+	done
+fi