Pass current Kotlin version to benchmark script

Allows using different current Kotlin versions in benchmark.
For example, SNAPSHOT version when current branch is master and
dev version on CI build.

^KT-49921 In Progress

libraries/tools/gradle/regression-benchmarks/Readme.md

@@ -2,7 +2,8 @@
 
 Contains build regression benchmark scripts for different user projects. 
 
-Such benchmarks comparing different build scenarios between last stable Kotlin release and current-in-progress release helping to identify build speed regressions.
+Such benchmarks comparing different build scenarios between last stable Kotlin release and current-in-progress release helping 
+to identify build speed regressions with minimal user-project modifications.
 
 All scripts should run via related Gradle task which could be found in "Gradle Regression Benchmark tasks" task group.
 
@@ -15,5 +16,6 @@ All scripts are using infrastructure provided by [template](../regression-benchm
 - Add required `@file:BenchmarkProject` annotation and few steps that will download profiler plus project itself
 - Inspect user-project and create required git patches to change Kotlin version in the project - add changes, test it 
 and use `git diff --no-color > name.patch` command. Put created patches into `benchmarkScripts/files` directory.
+- Update current Kotlin version patch to use Kotlin version passed as argument to script and available as `currentKotlinVersion`
 - Write benchmark scenarios and run benchmark with `dryRun = true` flag
 - Add final changes to script, probably convert it to use `runAllBenchmarks()` function

libraries/tools/gradle/regression-benchmarks/benchmarkScripts/duckduckgo.benchmark.kts

@@ -1,13 +1,25 @@
 // Android application written in Kotlin:
 // - kind of big codebase
 // - uses Kotlin compiler plugins and kapt
-
 @file:BenchmarkProject(
     name = "duckduckgo",
     gitUrl = "https://github.com/duckduckgo/Android.git",
     gitCommitSha = "659bd5aaac1fba922a6df9053daa2b7bcd610375"
 )
 
+import java.io.File
+
+val stableReleasePatch = {
+    "duckduckgo-kotlin-1.6.10.patch" to File("benchmarkScripts/files/duckduckgo-kotlin-1.6.10.patch").inputStream()
+}
+
+val currentReleasePatch = {
+    "duckduckgo-kotlin-current.patch" to File("benchmarkScripts/files/duckduckgo-kotlin-current.patch")
+        .readText()
+        .run { replace("<kotlin_version>", currentKotlinVersion) }
+        .byteInputStream()
+}
+
 runAllBenchmarks(
     suite {
         scenario {
@@ -31,7 +43,7 @@ runAllBenchmarks(
         }
     },
     mapOf(
-        "1.6.10" to "benchmarkScripts/files/duckduckgo-kotlin-1.6.10.patch",
-        "1.6.20" to "benchmarkScripts/files/duckduckgo-kotlin-current.patch"
+        "1.6.10" to stableReleasePatch,
+        "1.6.20" to currentReleasePatch
     )
 )

libraries/tools/gradle/regression-benchmarks/benchmarkScripts/files/duckduckgo-kotlin-current.patch

@@ -27,7 +27,7 @@ index 4497fd12..730df20a 100644
  
      ext {
 -        kotlin_version = '1.5.10'
-+        kotlin_version = '1.6.255-SNAPSHOT'
++        kotlin_version = '<kotlin_version>'
      }
      ext.spotless = "5.14.0"
 -    ext.anvil_version = "2.3.3"
@@ -67,7 +67,7 @@ index fae6ae6e..81cb692c 100644
  version.io.reactivex.rxjava2..rxjava=2.2.9
  
 -version.kotlin=1.5.31
-+version.kotlin=1.6.255-SNAPSHOT
++version.kotlin=<kotlin_version>
  
  version.kotlinx.coroutines=1.5.2
  

libraries/tools/gradle/regression-benchmarks/build.gradle.kts

@@ -23,7 +23,8 @@ dependencies {
 val service = project.extensions.getByType<JavaToolchainService>()
 
 abstract class ScriptArgumentProvider @Inject constructor(
-    layout: ProjectLayout
+    layout: ProjectLayout,
+    private val releaseKotlinVersion: String
 ) : CommandLineArgumentProvider {
     @get:Classpath
     abstract val scriptClasspath: ConfigurableFileCollection
@@ -40,7 +41,8 @@ abstract class ScriptArgumentProvider @Inject constructor(
             "-no-stdlib",
             "-classpath", scriptClasspath.asFileTree.files.joinToString(separator = File.pathSeparator),
             "-script", "benchmarkScripts/${script.get()}",
-            scriptOutputDirectories.get().asFile.absolutePath
+            scriptOutputDirectories.get().asFile.absolutePath,
+            releaseKotlinVersion
         )
     }
 }
@@ -62,7 +64,7 @@ fun addBenchmarkTask(
         classpath = compilerClasspath
         mainClass.set("org.jetbrains.kotlin.cli.jvm.K2JVMCompiler")
 
-        val scriptArgs = objects.newInstance<ScriptArgumentProvider>()
+        val scriptArgs = objects.newInstance<ScriptArgumentProvider>(version)
         scriptArgs.script.set(script)
         scriptArgs.scriptClasspath.from(scriptsClasspath)
         argumentProviders.add(scriptArgs)