#!/usr/bin/env bash

set -e

cd "$(dirname "$0")" && cd ..

PROG=`basename "$0"`

NAT='0|[1-9][0-9]*'

ALPHANUM='[0-9]*[A-Za-z-][0-9A-Za-z-]*'

IDENT="$NAT|$ALPHANUM"

FIELD='[0-9A-Za-z-]'

SEMVER_REGEX="\

^\

($NAT)\\.($NAT)\\.($NAT)\

(\\-(${IDENT})(\\.(${IDENT}))*)?\

(\\+${FIELD}(\\.${FIELD})*)?$"

USAGE="\

Usage:

$PROG -v <version>

Arguments:

-v A version must match the following regular expression:

\"${SEMVER_REGEX}\"

In English:

-- The version must match X.Y.Z[-PRERELEASE][+BUILD]

where X, Y and Z are non-negative integers.

-- PRERELEASE is a dot separated sequence of non-negative integers and/or

identifiers composed of alphanumeric characters and hyphens (with

at least one non-digit). Numeric identifiers must not have leading

zeros. A hyphen (\"-\") introduces this optional part.

-- BUILD is a dot separated sequence of identifiers composed of alphanumeric

Options:

-h, --help Print this help message.

See also:

https://semver.org"

function help {

echo -e "$USAGE" >&2

}

function error {

echo -e "Error: $1" >&2

}

# Parse arguments

OPTIND=1 # Reset in case getopts has been used previously in the shell.

while getopts "h?v:" opt; do

case "$opt" in

h|\?)

help

exit 0

;;

v)

VERSION=$OPTARG

;;

\? )

error "invalid Option: -$OPTARG" >&2

exit 1

;;

esac

done

shift $((OPTIND-1))

[ "${1:-}" = "--" ] && shift

if [ ! -n "$VERSION" ]; then

error "missing version, use the -v flag"

help

exit 1

fi

if [[ ! "$VERSION" =~ $SEMVER_REGEX ]]; then

error "version $VERSION does not match the semver scheme 'X.Y.Z(-PRERELEASE)(+BUILD)'. See help for more information."

exit 2

fi

# Check if you don't have uncommited changes.

if [ -n "$(git status --porcelain)" ]; then

error "you've got uncommitted changes in tracked files. Please make sure you're on a clean commit.";

exit 2

fi

# Check if you're not ahead of the origin.

git remote update 2>&1 > /dev/null

if git status -uno | grep -q "Your branch is ahead of"; then

error "your branch is ahead of the origin. Please make sure the commit you want to release is already on the origin.";

exit 2

fi

# Ready to release!

git tag "v$VERSION" -m "v$VERSION"

git push origin "v$VERSION"