TraceLog

Kotlin compiler plugin to automate println debugging, because debuggers are for people smarter than me.

Installation

Apply the Gradle plugin to your Kotlin project

plugins {
  id("dev.msfjarvis.tracelog") version "0.1.3"
}

Optionally configure the annotation class and logger method (defaults shown below)

traceLog {
  loggerFunction.set("kotlin.io.println")
  annotationClass.set("dev/msfjarvis/tracelog/runtime/annotations/DebugLog")
}

The loggerFunction parameter must be a fully qualified to a static method with a single parameter of the type Any?.

fun recordMessage() {} // Bad, no parameter
fun recordMessage(p0: String, p1: Int) {} // Bad, multiple parameters and incorrect types
fun recordMessage(p0: Any?) {} // Good, single parameter with correct type

Note

Due to a limitation in how TraceLog resolves the logger function, you might need to add @JvmStatic on the method for TraceLog to be able to find it. This will be fixed in a future release.

Usage

Currently, this prints out a basic textual representation of the method's inputs and execution time. That is, given this code:

@DebugLog
fun debuggableFunction(p0: String): String {
  return "Debugging is cool!"
}

fun main() {
  debuggableFunction("First parameter")
}

The compiler plugin will generate code that writes the following messages

⇢ debuggableFunction(p0=First parameter)
⇠ debuggableFunction [214.209us] = Debugging is cool!

Compatibility

Kotlin Version	TraceLog Version
1.9.0	0.1.x