Add packet-based GUI backend

.github/workflows/verify.yml

@@ -0,0 +1,50 @@
+name: Verify
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: verify-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  verify:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          submodules: recursive
+          fetch-depth: 0
+
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 25
+
+      - uses: gradle/actions/setup-gradle@v4
+
+      # gitpatcher commits every patch into the generated target repository, which git refuses to do
+      # without an identity.
+      - name: Configure git identity
+        run: |
+          git config --global user.name "github-actions[bot]"
+          git config --global user.email "github-actions[bot]@users.noreply.github.com"
+
+      - name: Apply patches
+        run: ./gradlew applyPatches --stacktrace
+
+      - name: Test
+        run: ./gradlew testPatched --stacktrace
+
+      # A patch that no longer round-trips is the fork's easiest mistake: hand-editing patches/, or editing
+      # the target repository without regenerating. Both produce a tree that builds locally and cannot be
+      # reproduced from the committed patches.
+      - name: Check that the patches are up to date
+        run: |
+          ./gradlew makePatches --stacktrace
+          if ! git diff --quiet -- patches; then
+            echo "::error::patches/ is out of sync with the target repository. Run './gradlew makePatches' and commit the result."
+            git diff --stat -- patches
+            exit 1
+          fi

build.gradle.kts

@@ -30,16 +30,32 @@ val isWindows = System.getProperty("os.name")
     .lowercase()
     .contains("windows")
 
-val gradlew = if (isWindows) "gradlew.bat" else "./gradlew"
+// The wrapper is addressed by absolute path: `cmd /c gradlew.bat` resolves against PATH rather than the
+// task's workingDir and fails with "gradlew.bat is either misspelled or could not be found".
+val targetDir = layout.projectDirectory.dir("inventory-framework")
+val gradlew = targetDir.file(if (isWindows) "gradlew.bat" else "gradlew").asFile.absolutePath
 
-listOf("shadowJar", "publish").forEach { taskName ->
+// `test` is already taken by the `java` plugin on this project, so the delegating task carries a distinct
+// name. It is what CI runs to verify a pull request.
+val delegatedTasks = mapOf(
+    "shadowJar" to "shadowJar",
+    "publish" to "publish",
+    "publishToMavenLocal" to "publishToMavenLocal",
+    "testPatched" to "test",
+)
+
+delegatedTasks.forEach { (taskName, delegate) ->
     tasks.register<Exec>(taskName) {
-        group = if (taskName == "shadowJar") "build" else "publishing"
-        description = "Runs './gradlew $taskName' inside inventory-framework."
+        group = when (taskName) {
+            "shadowJar" -> "build"
+            "testPatched" -> "verification"
+            else -> "publishing"
+        }
+        description = "Runs './gradlew $delegate' inside inventory-framework."
 
         dependsOn("applyPatches")
-        workingDir = layout.projectDirectory.dir("inventory-framework").asFile
-        val args = listOf(taskName)
+        workingDir = targetDir.asFile
+        val args = listOf(delegate)
 
         if (isWindows) {
             commandLine("cmd", "/c", gradlew, *args.toTypedArray())