Create and auto-increment Release versions on GitHub

git-release

#!/bin/bash

Green='\033[1;32m'
Red='\033[0;31m'
NC='\033[0m' # No Color
Yellow='\033[0;33m'

should_bump=true

bump_major()
{
	ver=$version

	major=`echo $ver | cut -d. -f1`
	minor=`echo $ver | cut -d. -f2`
	revision=`echo $ver | cut -d. -f3`
	major=`expr $major + 1`

	version="$major.$minor.$revision"
}

bump_minor()
{
	ver=$version

	major=`echo $ver | cut -d. -f1`
	minor=`echo $ver | cut -d. -f2`
	revision=`echo $ver | cut -d. -f3`
	minor=`expr $minor + 1`

	version="$major.$minor.$revision"
}

bump_revision()
{
	ver=$version
	echo $version
	major=`echo $ver | cut -d. -f1`
	minor=`echo $ver | cut -d. -f2`
	revision=`echo $ver | cut -d. -f3`
	revision=`expr $revision + 1`

	version="$major.$minor.$revision"
}

update_tags_list()
{
	echo "Updatng tags list..."

	{
		git tag -l | xargs git tag -d 
		git fetch --tags --all
	} &> /dev/null
}

create_release()
{
	branch=$(git rev-parse --abbrev-ref HEAD)

	repo_full_name=$(git config --get remote.origin.url | sed 's/.*:\/\/github.com\///;s/.git$//')

	token=$(git config --global github.token)

	echo "Create release $version for repo: $repo_full_name branch: $branch"

	response=$(curl --silent l --data "$(generate_post_data)" "https://api.github.com/repos/$repo_full_name/releases?access_token=$token") 

	if [[ $response =~ created_at ]];
	then
		echo -e "${Green}Release created successfully!${NC}"
	else
		echo -e "${Red}Error: Failed to create release. Try again.${NC}"
	fi
	update_tags_list

}

handle_initial_version_number()
{
	case $version in
		'fatal: No names found, cannot describe anything.' | '' )
			version="v0.0.1"
			echo "There are no releases, setting inital release version."
			;;
	esac

}

generate_post_data()
{
  cat <<EOF
{
  "tag_name": "$version",
  "target_commitish": "$branch",
  "name": "$version",
  "body": "$message",
  "draft": false,
  "prerelease": false
}
EOF
}

auto_bump_version()
{

	version="$(git tag --sort=v:refname | tail -1)"

}

show_usage()
{
	echo -e "${Green}Usage: git release -v[1.0.1 | v1.0.1] -m\"Message\"${NC}"
	echo "Examples:"
	echo "git release -vv1.0.1 -m\"Fixed a typo\""
	echo "git release -m\"Fixed a typo\""
}

if [[ $# -eq 0 ]] ; then
    show_usage
    exit 0
fi

current_release="$(git tag --sort=v:refname | tail -1)"

if [[ -z "${current_release// }" ]];
then
	version="v0.0.1"
	should_bump=false
else
	version=$current_release
fi

while getopts ":v:m:" opt; do
  case $opt in
    v) 
		version="$OPTARG"
		should_bump=false
    ;;
    m) message="$OPTARG"
    ;;
    \?) echo -e "${Green}Usage: git release -v1.0.1${NC}";exit >&2
    ;;
  esac
done

if [[ $version != v* ]] ;
then
 	version="v$version"
fi

if [[ $version =~ ^v[0-9]+(\.[0-9]+){2,3}$ ]]; 
then
  	update_tags_list
	if [[ "$should_bump" = true ]]; 
	then
		bump_revision
		echo -e "${Yellow}Next relase version will be $version${NC}"
	fi
	create_release
else
	echo -e "${Red}Error: Please make sure version follows semver${NC}"
fi