setup workflow

.github/workflows/release.yml

@@ -0,0 +1,80 @@
+name: Release
+
+# Builds the nine platform jars and publishes them as a GitHub release.
+#
+# Two ways in:
+#   - push a tag matching v* (e.g. v1.0.0) -- the release is created at that
+#     tag, and the tag is checked against mod_version in gradle.properties so
+#     the jars and the release cannot disagree about what version they are;
+#   - run it by hand (workflow_dispatch) -- the release is created at the
+#     dispatched commit under the tag derived from mod_version, creating the
+#     tag if it does not exist yet.
+on:
+  push:
+    tags: ['v*']
+  workflow_dispatch:
+
+permissions:
+  contents: write
+
+concurrency:
+  group: release-${{ github.ref }}
+  cancel-in-progress: false
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      # Buckets 1-8 compile with a JDK 21 toolchain; 26.2 needs JDK 25, which
+      # Gradle provisions on its own through the foojay resolver in
+      # settings.gradle -- the same mechanism a local build uses.
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '21'
+
+      - name: Set up Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: Build all platforms
+        run: ./gradlew test buildAllPlatforms
+
+      - name: Resolve version
+        id: version
+        run: |
+          VERSION="$(sed -n 's/^mod_version=//p' gradle.properties)"
+          echo "mod_version=$VERSION" >> "$GITHUB_OUTPUT"
+          echo "tag=v$VERSION" >> "$GITHUB_OUTPUT"
+          if [[ "${{ github.event_name }}" == "push" && "v$VERSION" != "${{ github.ref_name }}" ]]; then
+            echo "::error::Tag ${{ github.ref_name }} does not match mod_version=$VERSION in gradle.properties (expected v$VERSION)"
+            exit 1
+          fi
+
+      - name: Collect jars
+        run: |
+          mkdir -p dist
+          for jar in platform/*/build/libs/*.jar; do
+            case "$jar" in
+              *-sources.jar) ;;
+              *) cp "$jar" dist/ ;;
+            esac
+          done
+          # platform/common is a source root, not a bucket -- count the real ones.
+          buckets="$(ls -d platform/*/ | grep -vc 'platform/common/')"
+          jars="$(ls dist | wc -l)"
+          test "$jars" -eq "$buckets"
+          ls -la dist
+
+      - name: Publish release
+        uses: softprops/action-gh-release@v2
+        with:
+          # On a tag push the pushed tag is used as-is; on a manual run the
+          # tag comes from mod_version and is created at the built commit.
+          tag_name: ${{ github.event_name == 'workflow_dispatch' && steps.version.outputs.tag || '' }}
+          target_commitish: ${{ github.event_name == 'workflow_dispatch' && github.sha || '' }}
+          files: dist/*
+          generate_release_notes: true
+          fail_on_unmatched_files: true

README.md

@@ -29,15 +29,15 @@ Supports **Minecraft 1.20 through 26.2**, client side only. Requires
 
    | Your Minecraft version | Jar |
    | --- | --- |
-   | 1.20 – 1.20.1 | `photosync-1.20.1-1.0.0.jar` |
-   | 1.20.2 – 1.20.4 | `photosync-1.20.4-1.0.0.jar` |
-   | 1.20.5 – 1.20.6 | `photosync-1.20.6-1.0.0.jar` |
-   | 1.21 – 1.21.1 | `photosync-1.21.1-1.0.0.jar` |
-   | 1.21.2 – 1.21.4 | `photosync-1.21.4-1.0.0.jar` |
-   | 1.21.5 | `photosync-1.21.5-1.0.0.jar` |
-   | 1.21.6 – 1.21.10 | `photosync-1.21.8-1.0.0.jar` |
-   | 1.21.11 – 1.21.x | `photosync-1.21.11-1.0.0.jar` |
-   | 26.1 – 26.2 | `photosync-26.2-1.0.0.jar` |
+   | 1.20 – 1.20.1 | `photosync-1.20.1-x.y.z.jar` |
+   | 1.20.2 – 1.20.4 | `photosync-1.20.4-x.y.z.jar` |
+   | 1.20.5 – 1.20.6 | `photosync-1.20.6-x.y.z.jar` |
+   | 1.21 – 1.21.1 | `photosync-1.21.1-x.y.z.jar` |
+   | 1.21.2 – 1.21.4 | `photosync-1.21.4-x.y.z.jar` |
+   | 1.21.5 | `photosync-1.21.5-x.y.z.jar` |
+   | 1.21.6 – 1.21.10 | `photosync-1.21.8-x.y.z.jar` |
+   | 1.21.11 – 1.21.x | `photosync-1.21.11-x.y.z.jar` |
+   | 26.1 – 26.2 | `photosync-26.2-x.y.z.jar` |
 
    Each jar declares its own supported range, so Fabric will refuse to load the
    wrong one rather than crashing later.
@@ -215,6 +215,11 @@ version in a dev client:
 ./gradlew :platform:1.21.11:runClient
 ```
 
+Releases are built and published by `.github/workflows/release.yml`: push a
+`v<version>` tag (which must match `mod_version` in `gradle.properties`), or run
+the workflow by hand and it builds the current commit and releases it under the
+`mod_version` tag.
+
 The source tree is one shared implementation plus nine thin per-version
 adapters. If you are adding a Minecraft version or wondering why the layout is
 the way it is, [`docs/PORTING.md`](docs/PORTING.md) is the document for that: it