Let the WireCompiler handle multiple targets in the same command

.github/workflows/build.yml

@@ -63,7 +63,7 @@ jobs:
       - name: Setup Xcode
         uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: latest-stable
+          xcode-version: 15.4.0
 
       # We set `SDKROOT` as a workaround for https://github.com/gradle/gradle/pull/29227
       - name: Check test files
@@ -129,7 +129,7 @@ jobs:
       - name: Setup Xcode
         uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: latest-stable
+          xcode-version: 15.4.0
 
       # We set `SDKROOT` as a workaround for https://github.com/gradle/gradle/pull/29227
       - name: Test Swift Runtime
@@ -206,7 +206,7 @@ jobs:
       - name: Setup Xcode
         uses: maxim-lobanov/setup-xcode@v1
         with:
-          xcode-version: latest-stable
+          xcode-version: 15.4.0
 
       # We set `SDKROOT` as a workaround for https://github.com/gradle/gradle/pull/29227
       - name: Upload Artifacts

wire-compiler/src/main/java/com/squareup/wire/WireCompiler.kt

@@ -150,7 +150,8 @@ class WireCompiler internal constructor(
         emitDeclaredOptions = emitDeclaredOptions,
         emitAppliedOptions = emitAppliedOptions,
       )
-    } else if (kotlinOut != null) {
+    }
+    if (kotlinOut != null) {
       targets += KotlinTarget(
         exclusive = kotlinExclusive,
         outDirectory = kotlinOut,
@@ -167,11 +168,13 @@ class WireCompiler internal constructor(
         escapeKotlinKeywords = kotlinEscapeKeywords,
         emitProtoReader32 = emitProtoReader32,
       )
-    } else if (swiftOut != null) {
+    }
+    if (swiftOut != null) {
       targets += SwiftTarget(
         outDirectory = swiftOut,
       )
-    } else if (customOut != null || schemaHandlerFactoryClass != null) {
+    }
+    if (customOut != null || schemaHandlerFactoryClass != null) {
       if (customOut == null || schemaHandlerFactoryClass == null) {
         throw IllegalArgumentException("Both custom_out and schema_handler_factory_class need to be set")
       }

wire-compiler/src/test/java/com/squareup/wire/WireCompilerTest.kt

@@ -115,6 +115,45 @@ class WireCompilerTest {
     assertThat(logs).containsExactly("artifactHandled(com.squareup.wire.protos.person.Person, Java)")
   }
 
+  @Test
+  fun runMultipleTargets() {
+    val sources = arrayOf("person.proto")
+
+    val args = ArrayList<String>()
+    args.add(TargetLanguage.JAVA.protoPathArg())
+    args.add(TargetLanguage.JAVA.outArg("/".toPath() / testDir))
+    args.add(TargetLanguage.KOTLIN.protoPathArg())
+    args.add(TargetLanguage.KOTLIN.outArg("/".toPath() / testDir))
+    args.add("--no_kotlin_exclusive")
+    args.add("--dry_run")
+    args.addAll(sources)
+
+    val logs = mutableListOf<String>()
+    val logger = object : WireLogger {
+      override fun artifactHandled(outputPath: Path, qualifiedName: String, targetName: String) {
+        logs.add("artifactHandled($qualifiedName, $targetName)")
+      }
+      override fun artifactSkipped(type: ProtoType, targetName: String) = Unit
+      override fun unusedRoots(unusedRoots: Set<String>) = Unit
+      override fun unusedPrunes(unusedPrunes: Set<String>) = Unit
+      override fun unusedIncludesInTarget(unusedIncludes: Set<String>) = Unit
+      override fun unusedExcludesInTarget(unusedExcludes: Set<String>) = Unit
+    }
+    val fs = fileSystem
+    val compiler = WireCompiler.forArgs(fs, logger, *args.toTypedArray<String>())
+    compiler.compile()
+
+    // We assert nothing has been generated.
+    assertJavaOutputs(arrayOf())
+    assertKotlinOutputs(arrayOf())
+    assertSwiftOutputs(arrayOf())
+    // But we logged things because we're dry-running.
+    assertThat(logs).containsExactly(
+      "artifactHandled(com.squareup.wire.protos.person.Person, Kotlin)",
+      "artifactHandled(com.squareup.wire.protos.person.Person, Java)",
+    )
+  }
+
   @Test
   fun testPersonAndroid() {
     val sources = arrayOf("person.proto")
@@ -726,6 +765,9 @@ class WireCompilerTest {
   private fun assertKotlinOutputs(outputs: Array<String>, suffix: String = "") =
     assertOutputs(TargetLanguage.KOTLIN, outputs, suffix)
 
+  private fun assertSwiftOutputs(outputs: Array<String>, suffix: String = "") =
+    assertOutputs(TargetLanguage.SWIFT, outputs, suffix)
+
   private fun assertOutputs(target: TargetLanguage, outputs: Array<String>, suffix: String = "") {
     val filesAfter = paths
     assertThat(filesAfter.size)
@@ -770,6 +812,11 @@ class WireCompilerTest {
       override fun outArg(testDirPath: Path) = "--kotlin_out=$testDirPath"
       override fun protoFolderSuffix() = "kotlin"
     },
+    SWIFT {
+      override fun protoPathArg() = "--proto_path=../wire-tests/src/commonTest/proto/kotlin"
+      override fun outArg(testDirPath: Path) = "--swift_out=$testDirPath"
+      override fun protoFolderSuffix() = "swift"
+    },
     ;
 
     abstract fun protoPathArg(): String