Can I run the compiler directly from Kotlin in the same JVM?

# compiler

[Marc Knaup]

Can I run the compiler directly from Kotlin in the same JVM?

[kevinmost]

I think the embeddable compiler artifact is what you want?

[Marc Knaup]

Ah, the embedded compiler, didn't think of that one! I'll check it out tomorrow and see if I can get it running in-process including annotation processing 👍
Thanks 🙏

[tschuchort]

If you want to compile Kotlin code and run annotation processors you can use my AP library. It includes a compile-testing module with a pre-release on jitpack

[Marc Knaup]

Thank, I'll check it out 🙂

[Marc Knaup]

Doesn't that one spawn another process, so it's not in-process?

[tschuchort]

I think the kotlin compiler is in process and the java one isn't (usually). But what do you care what process it runs in?

[Marc Knaup]

I want to pass an instance of my AP directly to the compiler

[Marc Knaup]

and then just get list of messages & exit code

[Marc Knaup]

just like in compile-testing

[Marc Knaup]

and I'm almost there I think 🙂

[Marc Knaup]

I got it ❤️

val result = KotlinCompiler()
	.jvmTarget(KotlinJvmTarget.v1_8)
	.processors(AnnotationProcessor())
	.sourceFiles(File("tests/samples/Sample1.kt"), File("tests/samples/Test.java"))
	.withSystemClasspaths()
	.compile()

println(result.messages.joinToString("\n"))
println(result.generatedFiles.joinToString("\n") { "Generated: ${it.path}" })
println(result.exitCode)

logging: Using Kotlin home directory <no_path>
logging: Configuring the compilation environment
warning: Unable to find kotlin-stdlib.jar in the Kotlin home directory. Pass either '-no-stdlib' to prevent adding it to the classpath, or the correct '-kotlin-home'
warning: Unable to find kotlin-script-runtime.jar in the Kotlin home directory. Pass either '-no-stdlib' to prevent adding it to the classpath, or the correct '-kotlin-home'
warning: Unable to find kotlin-reflect.jar in the Kotlin home directory. Pass either '-no-reflect' or '-no-stdlib' to prevent adding it to the classpath, or the correct '-kotlin-home'
Generated: hey/Sample1JSONCodec.kt
OK

[tschuchort]

How do you compile java files? I don't see any call to javac

[Marc Knaup]

Kotlin compiler does that heavy lifting

[tschuchort]

Are you sure? I don't think so

[tschuchort]

try calling your K2JvmCompiler with only java files. It won't even work

[Marc Knaup]

I've used it with a Java file too and it worked just fine.
Alos saw some core in the compiler which runs javac

[Marc Knaup]

I didn't try only Java, there was at least one KT. Maybe that's a different code path 😮

[tschuchort]

as far as I know javac is only called to run apt, not to compile Java files. That has to be done by the build system

[tschuchort]

and if only java files are given, K2JvmCompiler won't run at all

[Marc Knaup]

hmm let me double check

[Marc Knaup]

You're right, that doesn't work.
Let's see what can be done here 🤔

[tschuchort]

Let me just say the whole thing isn't as straight-forward as you think

[Marc Knaup]

I still think it is

[Marc Knaup]

So compiling java works just fine.
But I need to find a way around the limitation that there must be at least one KT file

[Marc Knaup]

Fixed, thanks for the nudge 🙂

https://github.com/fluidsonic/fluid-compiler/commit/b39793e8f60549f84105d7f4a93ad492333bede9