Konfig

A gradle tool that helps inject values during build configurations and that can be retrieve at runtime.

In other words, it brings buildTypes with structured basic data to kotlin-multiplatform applications

Introduction

Ever wanted to have different build types in your multiplatform application? You feel like most of the time your configurations during development time won't match those during deployment? konfig has you covered

Samples

In your build logic (gradle), you can inject values like this

konfig {
    debug(
        "change" to 1,
        "link" to "http://debug.com"
    )

    staging(
        "link" to "https://staging.com"
    )

    release(
        "link" to "https://release.com"
    )
}

and you can retrieve those values in your application as simple as

val kfg = konfig()
val link: String by kfg // onDebug:(debug.com), onStaging(staging.com), onRelease(release.com)

Setup:Gradle

Konfig comes with a gradle plugin as a well as a runtime library. Just do the following

Kotlin Multiplatform

plugins {
    // . . . .
    id("tz.co.asoft.konfig") version "0.0.2"
}

// . . .

dependencies {
    implementation("tz.co.asoft:konfig:+") // please use the latest version possible
}

Konfig Plugin

Setting up the konfig plugin makes it easy to help configure your buildTypes.

DRY - Don't Repeat Yourself

Consider the following konfiguration

konfig{
    debug(
        "app_name" to "My Killer App",
        "api_link" to "https://debug.com"
    )
    . . .
    release(
        "app_name" to "My Killer App",
        "api_link" to "https://release.com"
    )
}

This repetition can be solved by the common konfiguration. Like so

konfig{
    common(
        "app_name" to "My Killer App"
    )
    debug(
        "api_link" to "https://debug.com"
    )
    . . .
    release(
        "api_link" to "https://release.com"
    )
}

Just remember, common is a reserved builder. Don't think it creates a buildType with the name "common"

Nested Structures

konfig supports nested structures, and since it uses kotlinx-serialization-mapper extracting your nested structure is easy

konfig {
    debug(
        "license" to "MIT",
        "devs" to listOf(
            mapOf(
                "name" to "John Doe",
                "email" to "john@doe.com"
            ),
            mapOf(
                "name" to "Jane Doe",
                "email" to "jane@doe.com"
            )
        )
    )
}

You can even go crazy and do something like

data class Dev(val name: String, val email: String)
konfig {
    debug(
        "license" to "MIT",
        "devs" to listOf(
            Dev(name = "John Doe", email = "john@doe.com") // or just Dev("John Doe","john@doe.com")
            Dev(name = "Jane Doe", email = "jave@doe.com"),
        )
    )
}

And you can retrieve your data as easy as

val kfg = konfig()
val license: String by kfg
val devs: List<Map<String,String>> by kfg

val name by devs[0]
val email by devs[1]

println(name) // John Doe
println(email) // jane@doe.com

Naming your konfigs

You can name your konfigs if you wan't to, by default the names of the konfigs are as their buildType i.e debug -> debug, staging->stagin, release->release If you need to have a debug buildType named free, you can go just do as follows

konfig {
    debug("free_debug",
        "license" to "MIT"
    )

    debug("paid_debug"
        "licence" to "aSoft Ltd"
    )
}

Application Plugin

Very often, you need to automate how you collect your configurations. This should be as easy as setting up your configurations and run the build type you want. The application plugin gives you exactly that. But since every platform has it's own way of doing things we will tackle each of it seprately

Android Application

Setup

To setup the android application, you must declare the gradle plugins as follows (the order is important)

plugins {
    id("com.android.application")
    kotlin("android")
    id("tz.co.asoft.application")
}
// . . .
konfig{
    debug()
    staging()
    release()
}

Gradle Tasks

For each of the konfigurations above, the following gradle tasks are set

1. generate[Konfig]KonfigFile -> generates a json file with the set configuration
2. installRun[Konfig] -> a gradle task that installs and runs the specific version on a device or emulator

JVM Application

This gradle plugin, applies the native java application plugin and ads a few tasks more

Setup

plugins {
    kotlin("jvm")
    id("tz.co.asoft.application")
}

application {
    mainClassName = "path.to.class.NameKt" // required by the `application` plugin
}
// . . .
konfig{
    debug()
    staging()
    release()
}

Gradle Tasks

1. generate[Konfig]KonfigFile -> generate a json file for the konfigurations set
2. fatJar[Konfig] -> generates a fat jar in the build/libs of the specific konfiguration
3. installDist[Konfig] -> generates a distributable in build/binaries which is package together with it dependencies
4. run[Konfig] -> runs the application depending on the buildType

Browser Application

This shouldn't be confused with Javascript Applications. As we currently do not support nodejs applications

Setup

plugins {
    kotlin("js")
    id("tz.co.asoft.application")
}

// . . .
konfig{
    debug()
    staging()
    release()
}

Gradle Tasks

1. generate[Konfig]KonfigFile -> generates a json konfig file for that konfiguration
2. webpack[Konfig] -> creates a minified webpack bundle that can be deployed to any server
3. run[Konfig] -> opens the browser and runs the konfiguration. You should note that all debug types are not minified for obvious reasons, the rest are minified

Multiplatform Application

This plugin helps you write multiplatform application in one code base

Setup

plugins {
    id("com.android.application") version "4.1.0"
    kotlin("multiplatform") version "1.4.10"
    id("tz.co.asoft.application")
}

// . . .
konfig{
    debug()
    staging()
    release()
}

Gradle Tasks

If you have an android target with the name "android", you will get the following tasks

1. generateAndroid[Konfig]KonfigFile -> generate the json config file for the android target
2. installRunAndroid[Konfig] -> install and runs the application on a phone or emulator

N.B: If your target has a different name, feel free to swap the name with the word androd on the tasks

If you have a jvm target with the name "jvm", you will get the following tasks

1. generateJVM[Konfig]KonfigFile -> generate the json config file for the android target
2. fatJarJvm[Konfig] -> generates a fat jar of the java app in the build/libs of the specific konfiguration
3. runJvm[Konfig] -> runs the jvm application

N.B: To run the JVM application from kotlin("multiplatform") gradle plugin, you must declare an attribute "Main-Class" in your Konfig

If you have a browser target with the name "js", you will get the following tasks

1. generateJs[Konfig]KonfigFile -> generates a json konfig file for that konfiguration
2. webpackJs[Konfig] -> creates a minified webpack bundle that can be deployed to any server
3. runJs[Konfig] -> opens the browser and runs the js app with the provided konfiguration. You should note that all debug types are not minified for obvious reasons, the rest are minified