chore: ksp processor support

Author: sureshg

README.md

@@ -126,11 +126,14 @@ graph LR
     bom
     catalog
   end
+  subgraph ksp
+    processor
+  end
   web --> common
   web --> common
   desktop --> common
   backend --> common
   web --> common
   benchmarks --> common
 
-```
+```

gradle/build-logic/common-plugins/src/main/kotlin/settings/repos.settings.gradle.kts

@@ -21,7 +21,9 @@ pluginManagement {
   }
 
   plugins {
-    // id("org.jetbrains.compose").version(extra["compose.version"] as String)
+    // val kspVersion: String by settings
+    // id("com.google.devtools.ksp") version kspVersion apply false
+    // kotlin("multiplatform") version(extra["kotlin.version"] as String) apply false
   }
 
   repositories {

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 java                           = "22"
 kotlin                         = "1.9.0"
-kotlin-ksp                     = "1.9.0-1.0.11"
+kotlin-ksp                     = "1.9.0-1.0.12"
 kotlin-jvmtarget               = "20"
 kotlin-dsl-jvmtarget           = "17"
 kotlin-api-version             = "1.9"
@@ -176,6 +176,7 @@ kotlinx-reflect-lite                 = { module = "org.jetbrains.kotlinx:kotlinx
 kotlinx-collections-immutable        = { module = "org.jetbrains.kotlinx:kotlinx-collections-immutable"      , version.ref = "kotlinx-collections-immutable"}
 kotlinx-html                         = { module = "org.jetbrains.kotlinx:kotlinx-html"                       , version.ref = "kotlinx-html"}
 kotlinx-bench-runtime                = { module = "org.jetbrains.kotlinx:kotlinx-benchmark-runtime"          , version.ref = "kotlinx-benchmark"}
+kotlin-ksp-api                       = { module = "com.google.devtools.ksp:symbol-processing-api"            , version.ref = "kotlin-ksp"}
 
 ktor-bom                             = { module = "io.ktor:ktor-bom"                                  , version.ref = "ktor"}
 ktor-serialization                   = { module = "io.ktor:ktor-serialization"                        , version.ref = "ktor"}

ksp/processor/build.gradle.kts

@@ -0,0 +1,11 @@
+plugins { plugins.kotlin.mpp }
+
+kotlin.sourceSets.jvmMain {
+  dependencies {
+    implementation(libs.kotlin.ksp.api)
+    // implementation("com.squareup:kotlinpoet-ksp")
+  }
+
+  kotlin.srcDir("src/main/kotlin")
+  resources.srcDir("src/main/resources")
+}

ksp/processor/src/main/kotlin/TestProcessor.kt

@@ -0,0 +1,57 @@
+import com.google.auto.service.AutoService
+import com.google.devtools.ksp.processing.*
+import com.google.devtools.ksp.symbol.KSAnnotated
+import com.google.devtools.ksp.symbol.KSClassDeclaration
+import com.google.devtools.ksp.symbol.KSNode
+import com.google.devtools.ksp.visitor.KSTopDownVisitor
+import java.io.OutputStreamWriter
+
+@AutoService(SymbolProcessorProvider::class)
+class TestProcessorProvider : SymbolProcessorProvider {
+  override fun create(environment: SymbolProcessorEnvironment) =
+      TestProcessor(environment.codeGenerator, environment.logger)
+}
+
+class TestProcessor(val codeGenerator: CodeGenerator, val logger: KSPLogger) : SymbolProcessor {
+  private var invoked = false
+
+  override fun process(resolver: Resolver): List<KSAnnotated> {
+    val allFiles = resolver.getAllFiles().map { it.fileName }
+    logger.warn(allFiles.toList().toString())
+    if (invoked) {
+      return emptyList()
+    }
+    invoked = true
+
+    codeGenerator
+        .createNewFile(
+            dependencies = Dependencies.ALL_FILES,
+            packageName = "",
+            fileName = "Foo",
+            extensionName = "kt")
+        .use { output ->
+          OutputStreamWriter(output).use { writer ->
+            writer.write("package com.example\n\n")
+            writer.write("class Foo {\n")
+
+            val visitor = ClassVisitor()
+            resolver.getAllFiles().forEach { it.accept(visitor, writer) }
+            writer.write("}\n")
+          }
+        }
+    return emptyList()
+  }
+}
+
+class ClassVisitor : KSTopDownVisitor<OutputStreamWriter, Unit>() {
+  override fun defaultHandler(node: KSNode, data: OutputStreamWriter) {}
+
+  override fun visitClassDeclaration(
+      classDeclaration: KSClassDeclaration,
+      data: OutputStreamWriter
+  ) {
+    super.visitClassDeclaration(classDeclaration, data)
+    val symbolName = classDeclaration.simpleName.asString().lowercase()
+    data.write("    val $symbolName = true\n")
+  }
+}

settings.gradle.kts

@@ -21,3 +21,5 @@ include(":compose:desktop")
 include(":dep-mgmt:bom")
 
 include(":dep-mgmt:catalog")
+
+include(":ksp:processor")