#!/usr/bin/env bash

# Usage: ./changelog.sh [options]
# Options:
# --bump: (default) bump version based on conventional commits since last tag
# -t <tag>: specify a tag to bump the version to
#
# e.g.
# ./changelog.sh
# ./changelog.sh -t 0.5.9

FROM_VERSION=0.5.0
CHANGELOG_FILE=CHANGELOG.md

changelog() {
    local opts=$@

    if ! type -t git-cliff &>/dev/null
    then
        echo "git-cliff is required to generate the changelog" >&2
        return 1
    fi

    if [ -z "$opts" ]
    then
        echo "Using default opt --bump"
        opts="--bump"
    fi

    local changelog_details
    changelog_details=$(git-cliff $opts -- "$FROM_VERSION..")

    if [ -z "$changelog_details" ]
    then
        echo "Changelog generation failed" >&2
        return 2
    fi

    echo "$changelog_details" | uniq > "$CHANGELOG_FILE"

    echo "Changelog written to $CHANGELOG_FILE"
}

changelog "$@"