How do I get a custom property defined in 'gradle.properties in kotlin code?

Question

I added a custom property in gradle.properties :

libraryVersion=0.1.0-beta

How do I read this in the code I'm publishing? I would like to use this value in my Kotlin library without hardcoding it.

Answer 1

I found the answer I was looking for after digging for a while

Here's the solution:

build.gradle.kts:

import java.io.FileOutputStream
import java.util.Properties

version = "1.0.0"

val generatedVersionDir = "$buildDir/generated-version"

sourceSets {
  main {
    kotlin {
      output.dir(generatedVersionDir)
    }
  }
}

tasks.register("generateVersionProperties") {
  doLast {
    val propertiesFile = file("$generatedVersionDir/version.properties")
    propertiesFile.parentFile.mkdirs()
    val properties = Properties()
    properties.setProperty("version", "$version")
    val out = FileOutputStream(propertiesFile)
    properties.store(out, null)
  }
}

tasks.named("processResources") {
  dependsOn("generateVersionProperties")
}

Library.kts:

private val versionProperties = Properties()

val version: String
  get() {
    return versionProperties.getProperty("version") ?: "unknown"
  }

init {
  val versionPropertiesFile = this.javaClass.getResourceAsStream("/version.properties")
  versionProperties.load(versionPropertiesFile)
}