tools: Added script to generate changelog

tools/gen-changelog.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+#
+# Generates a changelog for a release
+
+set -euo pipefail
+
+if [ $# -ne 2 ]; then
+    echo "You must provide the repo directory and the previous tag."
+    echo "Example: ./tools/gen-changelog.sh . 0.0.0"
+    exit 1
+fi
+
+REPODIR=$1
+LASTTAG=$2
+NEWCHANGELOG=`mktemp`
+
+pushd $REPODIR
+VERSION=`python setup.py --version`
+echo "# `basename $PWD` v$VERSION" >> $NEWCHANGELOG
+echo '```' >> $NEWCHANGELOG
+git log $LASTTAG..HEAD --pretty="* %h: %s" >> $NEWCHANGELOG
+echo '```' >> $NEWCHANGELOG
+if [ -e CHANGELOG.md ]; then
+    echo "" >> $NEWCHANGELOG
+    cat CHANGELOG.md >> $NEWCHANGELOG
+fi
+mv $NEWCHANGELOG CHANGELOG.md
+rm -f $NEWCHANGELOG
+popd