name: IRC Notify

on:
  push:
  pull_request:
    types: [opened, closed, reopened]
  create:
  release:
    types: [published]
  workflow_dispatch:

env:
  IRC_SERVER: irc.undernet.org
  IRC_PORT: 6667
  IRC_CHANNEL: "#pisg"
  IRC_NICK: github-pisg

jobs:
  notify:
    runs-on: ubuntu-latest
    # Don't run on forks
    if: github.repository == 'PISG/pisg'
    steps:
      - name: build message
        id: msg
        env:
          EVENT: ${{ github.event_name }}
          REPO: ${{ github.event.repository.name }}
          ACTOR: ${{ github.actor }}
          REF_NAME: ${{ github.ref_name }}
          COMMITS: ${{ toJSON(github.event.commits) }}
          HEAD_MSG: ${{ github.event.head_commit.message }}
          COMPARE: ${{ github.event.compare }}
          PR_ACTION: ${{ github.event.pull_request.merged && 'merged' || github.event.action }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          PR_TITLE: ${{ github.event.pull_request.title }}
          PR_URL: ${{ github.event.pull_request.html_url }}
          REF_TYPE: ${{ github.event.ref_type }}
          RELEASE_TAG: ${{ github.event.release.tag_name }}
          RELEASE_URL: ${{ github.event.release.html_url }}
        run: |
          case "$EVENT" in
            push)
              count=$(echo "$COMMITS" | jq length)
              [ "$count" -gt 0 ] || exit 0
              # First line of the last commit only, to avoid flooding the channel
              title=$(printf '%s\n' "$HEAD_MSG" | head -n1 | cut -c1-200)
              msg="[$REPO] $ACTOR pushed $count commit(s) to $REF_NAME: $title $COMPARE" ;;
            pull_request)
              msg="[$REPO] $ACTOR $PR_ACTION PR #$PR_NUMBER: $PR_TITLE $PR_URL" ;;
            create)
              [ "$REF_TYPE" = tag ] || exit 0
              msg="[$REPO] $ACTOR tagged $REF_NAME" ;;
            release)
              msg="[$REPO] New release $RELEASE_TAG: $RELEASE_URL" ;;
            workflow_dispatch)
              msg="[$REPO] test notification triggered by $ACTOR" ;;
          esac
          echo "text=$msg" >> "$GITHUB_OUTPUT"

      # PRIVMSG straight to the channel without joining: needs #pisg to be -n and -r
      - name: send to IRC
        if: steps.msg.outputs.text != ''
        env:
          MESSAGE: ${{ steps.msg.outputs.text }}
        shell: python
        run: |
          import os, socket, sys
          chan, msg = os.environ["IRC_CHANNEL"], os.environ["MESSAGE"]
          s = socket.create_connection((os.environ["IRC_SERVER"], int(os.environ["IRC_PORT"])), timeout=60)
          f = s.makefile("r", encoding="utf-8", errors="replace")
          def send(line):
              s.sendall((line + "\r\n").encode())
          send("NICK " + os.environ["IRC_NICK"])
          send("USER %s 0 * :pisg GitHub notifier" % os.environ["IRC_NICK"])
          ok = False
          for line in f:
              line = line.rstrip()
              p = line.split()
              if p[0] == "PING":
                  send("PONG " + line[5:])
              elif len(p) < 2:
                  continue
              elif p[1] == "001":
                  send("PRIVMSG %s :%s" % (chan, msg))
                  # VERSION reply (351) proves the PRIVMSG was processed before we quit
                  send("VERSION")
              elif p[1] in ("404", "403", "433", "432"):
                  print(line)
                  break
              elif p[1] == "351":
                  ok = True
                  send("QUIT")
                  break
          s.close()
          sys.exit(0 if ok else 1)