#!/usr/bin/env bash
# Converts a repository's committed .werkator.yml into Forgejo Actions workflows
# (RFC 0006, step 1), one workflow per build definition that triggers on its own,
# its follow-ups as jobs with `needs`. What has no workflow counterpart is
# written as a comment in the workflow and listed on stderr.
#
# Usage:
#   tools/werkator-to-forgejo [REPO] [--stdout] [--strict] [--output-dir DIR] [--runs-on LABEL]
#
#   REPO          the target repository, or any directory inside it (default: .);
#                 the .werkator.yml in its root is converted, and the workflows are
#                 written into it, below .forgejo/workflows/
#   --output-dir  where to write them instead, relative to the repository root,
#                 e.g. .gitea/workflows for a Gitea forge
#   --stdout      print the workflows instead of writing them
#   --strict      write nothing and exit 1 when anything cannot be converted
#   --runs-on     the runner label of every job (default: docker)
#
# Only the committed file is read: the .git layers, the applied fragment and
# ~/.werkator.yml are runner and instance configuration in Forgejo terms, and
# they hold the secrets.
#
# The conversion is Werkator's `export:forgejo` command, so it binds the file
# exactly as Werkator does. It runs the `werkator` named by WERKATOR_BIN, else
# the one on PATH, else the jar of this checkout (built when missing).
set -euo pipefail

if [ -n "${WERKATOR_BIN:-}" ]; then
    werkator=("$WERKATOR_BIN")
elif command -v werkator >/dev/null 2>&1; then
    werkator=(werkator)
else
    here="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
    jar="$here/build/libs/werkator.jar"
    if [ ! -f "$jar" ]; then
        echo "==> Building $jar" >&2
        (cd "$here" && ./gradlew -q bootJar) >&2
    fi
    werkator=(java -jar "$jar")
fi

exec "${werkator[@]}" export:forgejo "$@"