name: port-to-omp

# Regenerate the omp port of pygenium from this repo and push it to
# Mike/omp-pygienium.
#
# Prerequisites on git.freno.me:
#   - an access token with write:repository scope, stored as the repo/org
#     secret PORTING_TOKEN (the workflow authenticates as `oauth2:<token>` over
#     https)
#   - a registered Actions runner (act_runner) for this repo
#
# Safe by construction: the port commit lands in the omp repo, never here, so
# this workflow cannot re-trigger itself.

on:
  push:
    branches: [master]

jobs:
  port:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Install bun
        uses: oven-sh/setup-bun@v2

      - name: Port to omp
        env:
          PORTING_TOKEN: ${{ secrets.PORTING_TOKEN }}
          OMP_REPO: omp-pygienium
        run: |
          set -euo pipefail
          # Trim the secret: a stray newline from pasting silently breaks
          # oauth2 basic-auth. Fail loudly when it is missing entirely.
          PORTING_TOKEN="$(printf '%s' "${PORTING_TOKEN}" | tr -d '[:space:]')"
          : "${PORTING_TOKEN:?PORTING_TOKEN secret is not set}"
          URL="https://oauth2:${PORTING_TOKEN}@git.freno.me/Mike/${OMP_REPO}.git"
          # The omp checkout lives in $RUNNER_TEMP, outside the pi checkout:
          # the port script refuses to write into a subdirectory of its own
          # source (cpSync would recurse into itself).
          PORT_DIR="${RUNNER_TEMP:-/tmp}/omp-port"

          if git ls-remote "$URL" HEAD >/dev/null 2>&1; then
            git clone --depth 1 "$URL" "$PORT_DIR"
            git -C "$PORT_DIR" config user.name  "omp-port"
            git -C "$PORT_DIR" config user.email "omp-port@freno.me"
          else
            git init -b main "$PORT_DIR"
            git -C "$PORT_DIR" remote add origin "$URL"
            git -C "$PORT_DIR" config user.name  "omp-port"
            git -C "$PORT_DIR" config user.email "omp-port@freno.me"
          fi

          # Regenerate the port directly into the omp checkout. The script
          # preserves .git, asserts every patch rule, and runs `bun install`
          # (refreshing bun.lock + node_modules).
          bun "$GITHUB_WORKSPACE/port-to-omp.mjs" --out "$PORT_DIR"

          cd "$PORT_DIR"
          # The port must compile against the pinned @oh-my-pi SDK before it
          # ships to users.
          bun run typecheck

          if git diff --quiet HEAD; then
            echo "port unchanged; nothing to push"
            exit 0
          fi
          git add -A
          git commit -m "port: sync from ${GITHUB_REPOSITORY}@${GITHUB_SHA::8}"
          git push origin HEAD:main