release

#!/usr/bin/env bash

set -e

# current Git branch
branch=$(git symbolic-ref HEAD | sed -e 's,.*/\(.*\),\1,')

version=$1
# v1.0.0, v1.5.2, etc.
versionLabel=v$version

# establish branch and tag name variables
devBranch=develop
masterBranch=master
releaseBranch=release-$versionLabel

# create the release branch from the -develop branch
git checkout -b $releaseBranch $devBranch

# file in which to update version number
versionFile="build.gradle"

# find version number assignment ("= v1.5.5" for example)
# and replace it with newly specified version number
sed -i.backup -E "s/version = '[0-9.]+'/version = '$version'/"  $versionFile $versionFile

# remove backup file created by sed command
rm $versionFile.backup

# commit version number increment
git commit -am "Bump version to $versionLabel"

# merge release branch with the new version number into master
git checkout $masterBranch
git merge --no-ff $releaseBranch --no-edit

# create tag for new version from -master
git tag $versionLabel

# merge release branch with the new version number back into develop
git checkout $devBranch
git merge --no-ff $releaseBranch --no-edit

# remove release branch
git branch -d $releaseBranch