Is it possible to create a custom buildsrc in Gradle 4.9 using the Kotlin DSL?

# gradle

[napperley]

Is it possible to create a custom buildsrc in Gradle 4.9 using the Kotlin DSL?

[alex2069]

Yes

[alex2069]

https://github.com/NextFaze/dev-fun/blob/master/buildSrc/build.gradle.kts

[alex2069]

That's using 4.9-RC-1

[alex2069]

And various code stuffs: https://github.com/NextFaze/dev-fun/tree/master/buildSrc/src/main/kotlin

[alex2069]

There are still some weird issues/limitations with cross-project (as in "gradle project") class loaders though

[napperley]

Seems that buildSrc in the root project isn't accessible in sub projects 🙁.

[alex2069]

It is and isn't - I declare a lot of functions in my buildSrc that are used in the subprojects

[alex2069]

But there are some limitions with plugins and classloaders (it's a known issue that's being addressed)

[alex2069]

So function calls at https://github.com/NextFaze/dev-fun/blob/master/devfun-menu/build.gradle.kts#L13
https://github.com/NextFaze/dev-fun/blob/master/devfun-menu/build.gradle.kts#L35
https://github.com/NextFaze/dev-fun/blob/master/devfun-menu/build.gradle.kts#L36
are all defined in the buildSrc

[alex2069]

I had to make configureAndroidLib an inline function though due to classloader issues

[napperley]

Trying to make the following accessible from the buildSrc in all projects:

object Version {
    val kotlin = "1.2.51"
    val dokka = "0.9.14"
}

[alex2069]

Yea that should be fine.
My dependency declarations:
https://github.com/NextFaze/dev-fun/blob/master/buildSrc/src/main/kotlin/dependencies.kt

Usage is as expected in subproject `api(Dependency.supportAppCompat)`:
https://github.com/NextFaze/dev-fun/blob/master/devfun-menu/build.gradle.kts#L26

[alex2069]

Oh, one thing I would suggest is to not use a package in your buildSrc project

[alex2069]

There were some weird issues when trying to reference things in the root project

[napperley]

The buildSrc still isn't accessible in the sub projects, only accessible in the root project.

[gildor]

@napperley No, everything should work. Try to build your project. IDE has some problems with buildSrc on dependencies change

[napperley]

So buildSrc dependency issues get resolved by executing the build task?

[gildor]

it’s IDE only problem

[gildor]

Give me a minute, I will find this issue

[gildor]

But we use buildSrc and it works properly for us, just not so smooth as could be

[gildor]

https://github.com/gradle/kotlin-dsl/issues/962

[gildor]

So build is not enough, you should somehow trigger build dependencies reloading

[gildor]

Will be fixed in 0.19

[gildor]

This is issue that I reported about this problem on Kotlin issue tracker
https://youtrack.jetbrains.com/issue/KT-25354

[napperley]

Using the terminal to run Gradle tasks as a temporary workaround to the issue ☝️.

[gildor]

@napperley Just follow workaround from the issue:

One workaround is to make a change in the plugins or buildscript block of the edited script.

[gildor]

After that IDE will cache correct version of classpath with your buildSrc depenedencies

[napperley]

Made the changes but only some of the errors are resolved. Still end up with the yellow banner appearing.

[alex2069]

Are you using Android Studio or IDEA?

[alex2069]

FTR I'm using Android Studio 3.3 Canary 3 and it's generally quite reliable

[alex2069]

If I change things in the buildSrc project sometimes I need to rebuild and restart the IDE for the warnings/errors to resolve (or using aforementioned workaround)

[napperley]

Using IntelliJ (v2018.2).