Add build-time MT_DEBUG_DEFAULT support for Constants.DEBUG

build.gradle

@@ -9,6 +9,28 @@ plugins {
 
 def envCI = System.getenv("CI")
 def isCI = envCI != null && envCI != ""
+def envMTDebugDefault = System.getenv("MT_DEBUG_DEFAULT")
+def mtDebugDefault = envMTDebugDefault != null ? envMTDebugDefault.toBoolean() : false
+def generatedBuildConfigDir = layout.buildDirectory.dir("generated/sources/mt/buildConfig")
+
+tasks.register("generateBuildConfig") {
+    outputs.dir(generatedBuildConfigDir)
+    doLast {
+        def outputFile = generatedBuildConfigDir.get().file("org/mtransit/commons/BuildConfig.kt").asFile
+        outputFile.parentFile.mkdirs()
+        outputFile.text = """package org.mtransit.commons
+
+internal object BuildConfig {
+    const val DEBUG_DEFAULT = ${mtDebugDefault}
+}
+"""
+    }
+}
+
+tasks.named("compileKotlin") {
+    dependsOn(tasks.named("generateBuildConfig"))
+    source(generatedBuildConfigDir)
+}
 
 java {
     sourceCompatibility = rootProject.javaVersion

src/main/java/org/mtransit/commons/Constants.kt

@@ -5,7 +5,7 @@ object Constants {
 
     @JvmStatic
     // val DEBUG = true // DEBUG
-    val DEBUG = false
+    val DEBUG = BuildConfig.DEBUG_DEFAULT
 
     const val NEW_LINE = '\n'
     const val SPACE = ' '

src/test/java/org/mtransit/commons/ConstantsTests.kt

@@ -0,0 +1,12 @@
+package org.mtransit.commons
+
+import kotlin.test.Test
+
+class ConstantsTests {
+
+    @Test
+    fun test_DEBUG() {
+        val expectedDebug = (System.getenv("MT_DEBUG_DEFAULT") ?: "false").toBoolean()
+        assert(Constants.DEBUG == expectedDebug)
+    }
+}