Add changelog make target helper

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

CONTRIBUTING.md

@@ -4,7 +4,7 @@
 
 Authors are expected to include a changelog file with their pull requests. The changelog file
 should be a new file created in the `changelogs/unreleased` folder. The file should follow the
-naming convention of `issue-username` and the contents of the file should be your text for the
+naming convention of `pr-username` and the contents of the file should be your text for the
 changelog.
 
     ark/changelogs/unreleased   <- folder

Makefile

@@ -233,6 +233,7 @@ clean:
 	docker rmi $(BUILDER_IMAGE)
 
 ci: all verify test
-
+changelog:
+	hack/changelog.sh
 goreleaser:
 	hack/goreleaser.sh

changelogs/unreleased/000-username

@@ -1 +0,0 @@
-Example changelog entry.

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}/*"