mc-pack-validate/action.yml

name: Validate Minecraft Packs
description: Validate and build datapack/resourcepack

inputs:
  pack_zip:
    description: Datapack zip output path
    required: true

  pack_type:
    description: Pack type - auto, datapack, resourcepack, or both
    required: false
    default: "auto"

  run_build:
    description: Run build.sh before validation
    required: false
    default: "true"

  run_mecha:
    description: Run Mecha datapack validation
    required: false
    default: "true"

  minecraft_version:
    description: Minecraft version for mecha
    required: false
    default: "26.1"

  mecha_stats:
    description: Output mecha stat
    required: false
    default: "false"

  mecha_log:
    description: Mecha log level
    required: false
    default: ""

runs:
  using: composite
  steps:
    - name: Build packs
      if: ${{ inputs.run_build == 'true' }}
      shell: bash
      run: |
        sh build.sh

    - name: Check JSON files
      shell: bash
      run: |
        python - <<'PY'
        import json
        from pathlib import Path

        failed = False

        for path in Path(".").rglob("*.json"):
            if ".git" in path.parts:
                continue
            if ".pack-check" in path.parts:
                continue
            if "node_modules" in path.parts:
                continue

            try:
                json.loads(path.read_text(encoding="utf-8"))
            except Exception as e:
                print(f"Invalid JSON: {path}")
                print(e)
                failed = True

        if failed:
            raise SystemExit(1)

        print("All JSON files are valid")
        PY

    - name: Check pack.mcmeta files
      shell: bash
      run: |
        python - <<'PY'
        import json
        from pathlib import Path

        failed = False
        found = False

        for path in Path(".").rglob("pack.mcmeta"):
            if ".git" in path.parts:
                continue
            if ".pack-check" in path.parts:
                continue

            found = True

            try:
                data = json.loads(path.read_text(encoding="utf-8"))
                pack = data.get("pack", {})

                if "pack_format" not in pack:
                    raise ValueError("Missing pack.pack_format")

                if "description" not in pack:
                    raise ValueError("Missing pack.description")

                if not isinstance(pack["pack_format"], int):
                    raise ValueError("pack.pack_format must be an integer")

                print(f"OK: {path}")

            except Exception as e:
                print(f"Invalid pack.mcmeta: {path}")
                print(e)
                failed = True

        if not found:
            print("No pack.mcmeta files found")
            failed = True

        if failed:
            raise SystemExit(1)
        PY

    - name: Validate zip files
      shell: bash
      run: |
        test -f "${{ inputs.pack_zip }}"
        unzip -t "${{ inputs.pack_zip }}"

    - name: Validate pack structure
      shell: bash
      env:
        PACK_TYPE: ${{ inputs.pack_type }}
      run: |
        set -euo pipefail

        rm -rf .pack-check
        mkdir -p .pack-check

        unzip -q "${{ inputs.pack_zip }}" -d .pack-check

        test -f .pack-check/pack.mcmeta

        has_data="false"
        has_assets="false"

        if [ -d .pack-check/data ]; then
            has_data="true"
        fi

        if [ -d .pack-check/assets ]; then
            has_assets="true"
        fi

        detected_type=""

        if [ "$has_data" = "true" ] && [ "$has_assets" = "true" ]; then
            detected_type="both"
        elif [ "$has_data" = "true" ]; then
            detected_type="datapack"
        elif [ "$has_assets" = "true" ]; then
            detected_type="resourcepack"
        else
            echo "Pack must contain data/ or assets/"
            exit 1
        fi

        if [ "$PACK_TYPE" = "auto" ]; then
            PACK_TYPE="$detected_type"
        fi

        case "$PACK_TYPE" in
        datapack)
            test "$has_data" = "true"
            ;;
        resourcepack)
            test "$has_assets" = "true"
            ;;
        both)
            test "$has_data" = "true"
            test "$has_assets" = "true"
            ;;
        *)
            echo "Unknown pack_type: $PACK_TYPE"
            echo "Expected: auto, datapack, resourcepack, or both"
            exit 1
            ;;
        esac

        echo "Detected pack type: $detected_type"
        echo "Validated pack type: $PACK_TYPE"

        echo "$PACK_TYPE" > .pack-check/type
        if [ -n "${GITHUB_ENV:-}" ]; then
          echo "PACK_TYPE=$PACK_TYPE" >> "$GITHUB_ENV"
          echo "DETECTED_PACK_TYPE=$detected_type" >> "$GITHUB_ENV"
        fi

        if [ -n "${GITEA_ENV:-}" ]; then
          echo "PACK_TYPE=$PACK_TYPE" >> "$GITEA_ENV"
          echo "DETECTED_PACK_TYPE=$detected_type" >> "$GITEA_ENV"
        fi

    - name: Install Mecha
      if: ${{ inputs.run_mecha == 'true' }}
      shell: bash
      run: |
        set -euo pipefail
        if [ "${PACK_TYPE:-}" = "resourcepack" ]; then
            echo "Resourcepack detected, skipping Mecha install"
            exit 0
        fi
        uv tool install mecha || uv tool upgrade mecha
        mecha --version

    - name: Run Mecha on built datapack
      if: ${{ inputs.run_mecha == 'true' }}
      shell: bash
      env:
        MINECRAFT_VERSION: ${{ inputs.minecraft_version }}
        MECHA_STATS: ${{ inputs.mecha_stats }}
        MECHA_LOG: ${{ inputs.mecha_log }}
      run: |
        set -euo pipefail


        if [ "${PACK_TYPE:-}" = "resourcepack" ]; then
        echo "Resourcepack detected, skipping Mecha"
        exit 0
        fi

        if [ ! -d .pack-check/data ]; then
            echo "No data/ directory found, skipping Mecha"
            exit 0
        fi

        mecha_args=()

        if [ -n "${MECHA_LOG:-}" ]; then
            mecha_args+=("-l" "$MECHA_LOG")
        fi

        if [ -n "${MINECRAFT_VERSION:-}" ]; then
            mecha_args+=("-m" "$MINECRAFT_VERSION")
        fi

        if [ "${MECHA_STATS:-false}" = "true" ]; then
            mecha_args+=("-s")
        fi

        mecha "${mecha_args[@]}" .pack-check