Added script for automating release process

Author: Vishal Shingala

package.json

@@ -6,7 +6,8 @@
   "scripts": {
     "test": "scripts/test.sh",
     "test-lint": "scripts/test-lint.sh",
-    "test-unit": "scripts/test-unit.sh"
+    "test-unit": "scripts/test-unit.sh",
+    "release": "scripts/release.sh"
   },
   "dependencies": {
     "js-yaml": "3.13.1",

scripts/release.sh

@@ -0,0 +1,69 @@
+#!/bin/bash
+# ----------------------------------------------------------------------------------------------------------------------
+# This script is intended to automate release process.
+# Explanation: This script will pull all latest changes from master and develop and checkout release branch from develop
+#   with specified version and then bump up package version and add CHANGELOGS (input required) and commit them. After
+#   that merge release branch into master and develop with appropriate tags.
+#
+# Example: "npm run release 1.2.3" 
+# ----------------------------------------------------------------------------------------------------------------------
+
+# Stop on first error
+set -e;
+
+# Ensure that the provided version is in valid semver format
+if [[ ! $1 =~ ^v?[0-9]+(\.[0-9]+){2}(-[a-z]+\.\d+)?$ ]]; then
+  echo "A valid version must be provided as the first argument.";
+  exit 1;
+fi
+
+ver=${1/v/}; # Strip the leading v from the version (if it exists)
+msg=$2;
+
+[[ -z $msg ]] && msg="Released v${ver}";
+
+# Update the master branch to the latest
+git checkout master;
+git pull origin master;
+
+# Update develop to the latest, and create a release brach off of it.
+git checkout develop;
+git pull origin develop;
+git checkout -b release/$ver;
+
+# Bump version in package.json, but do not create a git tag
+npm version $ver --no-git-tag-version;
+
+# Inject the current release version and date into the CHANGELOG file
+sed -i "" "3i\\
+#### v${ver} (`date '+%B %d, %Y'`)\\
+\\
+" CHANGELOG.md;
+
+# Find all commits between the HEAD on develop and the latest tag on master, and pipe their messages into the clipboard
+git log $(git describe --tags master --abbrev=0)..HEAD --merges --pretty=format:'* %s' | pbcopy;
+
+# Provision manual intervention for CHANGELOG.md
+vi CHANGELOG.md
+
+# Create the release
+git add CHANGELOG.md package.json;
+[[ -f package-lock.json ]] && git add package-lock.json;
+git commit -am "$msg";
+
+# Merge the release branch into develop and push
+git checkout develop;
+git merge --no-ff release/$ver;
+git push origin develop;
+
+# Merge the release branch into master, create a tag and push
+git checkout master;
+git merge --no-ff release/$ver;
+git tag -a "$ver" -m "$msg";
+git push origin master --follow-tags;
+
+# Move back to develop
+git checkout develop;
+git branch -d release/$ver;
+
+unset msg ver;