Add changelog make target helper

Signed-off-by: Wayne Witzel III <wayne@riotousliving.com>

hack/changelog.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+# Copyright 2018 the Heptio Ark contributors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+
+CHANGELOG_PATH='changelogs/unreleased'
+UNRELEASED=$(ls -t ${CHANGELOG_PATH})
+echo -e "Generating CHANGELOG markdown from ${CHANGELOG_PATH}\n"
+for entry in $UNRELEASED
+do
+    IFS=$'-' read -ra pruser <<<"$entry"
+    contents=$(cat ${CHANGELOG_PATH}/${entry})
+    echo "  * ${contents} (#${pruser[0]}, @${pruser[1]})"
+done
+echo -e "\nCopy and paste the list above in to the appropriate CHANGELOG file."
+echo "Be sure to run: git rm ${CHANGELOG_PATH}/*"