Add KSP plugin support for kotlin_library targets

Extend KSP support to pure Kotlin (JVM) library modules by wiring up
the plugin extraction in KotlinProjectDataExtractor and passing plugins
through to the generated kotlin_library targets.

Changes:
- Add plugins field to KotlinProjectData
- Extract KSP plugins via collectKspPluginDeps() in extractor
- Pass plugins to KotlinLibraryTarget in builder

Also add KSP/Moshi testing to sample modules:
- sample-kotlin-library: Add KotlinConfig data class with @JsonClass
- sample-android-library: Add @JsonClass to User (alongside @parcelize)

Author: minkuan88

grazel-gradle-plugin/src/main/kotlin/com/grab/grazel/migrate/kotlin/KotlinProjectData.kt

@@ -25,5 +25,6 @@ data class KotlinProjectData(
     val res: List<String>,
     val deps: List<BazelDependency>,
     val tags: List<String>,
-    val lintConfigData: LintConfigData
+    val lintConfigData: LintConfigData,
+    val plugins: List<BazelDependency> = emptyList()
 )

grazel-gradle-plugin/src/main/kotlin/com/grab/grazel/migrate/kotlin/KotlinProjectDataExtractor.kt

@@ -92,13 +92,16 @@ internal class DefaultKotlinProjectDataExtractor
             calculateDirectDependencyTags(self = name, deps = deps + transitiveMavenDeps)
         } else emptyList()
 
+        val plugins = dependenciesDataSource.collectKspPluginDeps(project, variantKey)
+
         return KotlinProjectData(
             name = name,
             srcs = srcs,
             res = resources,
             deps = deps.replaceAutoService(),
             tags = tags,
             lintConfigData = lintConfigs(project),
+            plugins = plugins
         )
     }
 

grazel-gradle-plugin/src/main/kotlin/com/grab/grazel/migrate/target/KotlinLibraryTargetBuilder.kt

@@ -76,7 +76,8 @@ constructor(
         res = res,
         deps = deps,
         tags = tags,
-        lintConfigData = lintConfigData
+        lintConfigData = lintConfigData,
+        plugins = plugins
     )
 }
 

keystore/BUILD.bazel

@@ -1,10 +1,9 @@
 filegroup(
-  name = "debug-keystore",
-  srcs = [
-    "debug.keystore",
-  ],
-  visibility = [
-    "//visibility:public",
-  ]
+    name = "debug-keystore",
+    srcs = [
+        "debug.keystore",
+    ],
+    visibility = [
+        "//visibility:public",
+    ],
 )
-

sample-android-library/BUILD.bazel

@@ -13,6 +13,9 @@ android_library(
         "config": "//:lint.xml",
     },
     manifest = "src/debug/AndroidManifest.xml",
+    plugins = [
+        "//:moshi-kotlin-codegen-ksp",
+    ],
     resource_sets = {
         "debug": {
             "manifest": "src/debug/AndroidManifest.xml",
@@ -26,6 +29,7 @@ android_library(
     ],
     deps = [
         "//:parcelize",
+        "@maven//:com_squareup_moshi_moshi",
     ],
 )
 
@@ -42,6 +46,9 @@ android_library(
         "config": "//:lint.xml",
     },
     manifest = "src/debug/AndroidManifest.xml",
+    plugins = [
+        "//:moshi-kotlin-codegen-ksp",
+    ],
     resource_sets = {
         "debug": {
             "manifest": "src/debug/AndroidManifest.xml",
@@ -55,6 +62,7 @@ android_library(
     ],
     deps = [
         "//:parcelize",
+        "@maven//:com_squareup_moshi_moshi",
     ],
 )
 
@@ -71,6 +79,9 @@ android_library(
         "config": "//:lint.xml",
     },
     manifest = "src/debug/AndroidManifest.xml",
+    plugins = [
+        "//:moshi-kotlin-codegen-ksp",
+    ],
     resource_sets = {
         "debug": {
             "manifest": "src/debug/AndroidManifest.xml",
@@ -84,6 +95,7 @@ android_library(
     ],
     deps = [
         "//:parcelize",
+        "@maven//:com_squareup_moshi_moshi",
     ],
 )
 
@@ -100,6 +112,9 @@ android_library(
         "config": "//:lint.xml",
     },
     manifest = "src/debug/AndroidManifest.xml",
+    plugins = [
+        "//:moshi-kotlin-codegen-ksp",
+    ],
     resource_sets = {
         "debug": {
             "manifest": "src/debug/AndroidManifest.xml",
@@ -113,6 +128,7 @@ android_library(
     ],
     deps = [
         "//:parcelize",
+        "@maven//:com_squareup_moshi_moshi",
     ],
 )
 
@@ -135,6 +151,7 @@ android_unit_test(
     deps = [
         "//:parcelize",
         "//sample-android-library:sample-android-library-demo-free-debug",
+        "@maven//:com_squareup_moshi_moshi",
         "@maven//:junit_junit",
     ],
 )
@@ -158,6 +175,7 @@ android_unit_test(
     deps = [
         "//:parcelize",
         "//sample-android-library:sample-android-library-demo-paid-debug",
+        "@maven//:com_squareup_moshi_moshi",
         "@maven//:junit_junit",
     ],
 )
@@ -181,6 +199,7 @@ android_unit_test(
     deps = [
         "//:parcelize",
         "//sample-android-library:sample-android-library-full-free-debug",
+        "@maven//:com_squareup_moshi_moshi",
         "@maven//:junit_junit",
     ],
 )
@@ -204,6 +223,7 @@ android_unit_test(
     deps = [
         "//:parcelize",
         "//sample-android-library:sample-android-library-full-paid-debug",
+        "@maven//:com_squareup_moshi_moshi",
         "@maven//:junit_junit",
     ],
 )

sample-android-library/build.gradle

@@ -18,6 +18,7 @@ plugins {
     alias(libs.plugins.android.library)
     alias(libs.plugins.kotlin.android)
     alias(libs.plugins.kotlin.parcelize)
+    alias(libs.plugins.ksp)
 }
 
 android {
@@ -29,5 +30,7 @@ android {
 }
 
 dependencies {
+    implementation libs.moshi
+    ksp libs.moshi.codegen
     testImplementation libs.junit
 }

sample-android-library/src/main/java/com/grab/grazel/android/sample/SampleViewModel.kt

@@ -18,11 +18,27 @@ package com.grab.grazel.android.sample
 
 import android.os.Parcelable
 import android.util.Log
+import com.squareup.moshi.JsonClass
+import com.squareup.moshi.Moshi
 import kotlinx.parcelize.Parcelize
 
+/**
+ * Data class to test both Parcelize and KSP code generation with Moshi.
+ */
 @Parcelize
-class User(val firstName: String, val lastName: String) : Parcelable
+@JsonClass(generateAdapter = true)
+data class User(val firstName: String, val lastName: String) : Parcelable
 
 class SampleViewModel {
     val user = User(firstName = "tom", lastName = "hanks")
+
+    /**
+     * Verify KSP code generation by using the generated Moshi adapter.
+     * This will fail to compile if KSP doesn't generate UserJsonAdapter.
+     */
+    fun verifyKspCodeGeneration(): String {
+        val moshi = Moshi.Builder().build()
+        val adapter = moshi.adapter(User::class.java)
+        return adapter.toJson(user)
+    }
 }

sample-android/src/main/java/com/grab/grazel/android/sample/MainActivity.kt

@@ -93,6 +93,5 @@ class MainActivity : ComponentActivity() {
         val moshi = Moshi.Builder().build()
         val adapter = moshi.adapter(User::class.java)
         val json = adapter.toJson(User("Test", 25))
-        Log.d("KSP", "Moshi KSP generated: $json")
     }
-}
+}

sample-kotlin-library/BUILD.bazel

@@ -10,9 +10,15 @@ kotlin_library(
         "baseline": "lint-baseline-kotlin.xml",
         "lint_checks": ["@lint_maven//:com_slack_lint_slack_lint_checks"],
     },
+    plugins = [
+        "//:moshi-kotlin-codegen-ksp",
+    ],
     visibility = [
         "//visibility:public",
     ],
+    deps = [
+        "@maven//:com_squareup_moshi_moshi",
+    ],
 )
 
 kotlin_test(
@@ -28,6 +34,7 @@ kotlin_test(
         "//visibility:public",
     ],
     deps = [
+        "@maven//:com_squareup_moshi_moshi",
         "@maven//:junit_junit",
     ],
 )

sample-kotlin-library/build.gradle

@@ -16,6 +16,7 @@
 plugins {
     id("kotlin")
     id("com.android.lint")
+    alias(libs.plugins.ksp)
 }
 
 lint {
@@ -24,6 +25,8 @@ lint {
 
 dependencies {
     implementation fileTree(dir: "libs", include: ["*.jar"])
+    implementation libs.moshi
+    ksp libs.moshi.codegen
     lintChecks libs.slack.lint.checks
     testImplementation libs.junit
 }