Support for Gradle composite builds

[zharinov]

What would you like Renovate to be able to do?

https://docs.gradle.org/current/userguide/composite_builds.html#composite_build_intro

Did you already have any implementation ideas?

• Recognition pattern may look like this: [a-zA-Z][a-zA-Z0-9]([vV]ersions|[dD]eps|...)\.kt
• Files should be processed after gradle.properties, but before build.gradle.kts
• Currently we use globally scoped variables, now we have to support multi-level scoping, e.g. Versions.Plugins.NODEJS
• Variables should be available for immediate string interpolation
• Dependency strings ("foo:bar:1.2.3") should be extracted as well, though evaluation should occur in the build.gradle.kts context
  • In future, this should help to deal with complex scoped user-defined repository rules
    (i.e. determine a valid registryUrl sequence)
  • When done for Versions.kt files, this mechanism should be applied for deps defined in gradle.properties as well

Example files:

• https://github.com/donbeave/graphql-java-datetime
  • buildSrc/src/main/java/Versions.kt
  • build.gradle.kts
  • Ref: (chore) Updating kotlin, graphql-java, springboot and reactor dependencies tailrocks/graphql-java-datetime#39

More examples:

• radikushch/GAlertButton:dependencies/src/main/java/com/example/dependencies/GlobalVersions.kt
• square/okhttp:buildSrc/src/main/kotlin/deps.kt
• PokerAlpaka/kunde:buildSrc/src/main/kotlin/Versions.kt
• thewca/tnoodle:buildSrc/src/main/kotlin/dependencies/Versions.kt

[rarkins]

Do we need to discover these files using fileMatch or will the build.gradle reference them?

[rarkins]

Also, is this the same as #8692 ?

[zharinov]

Oh, I forgot about it. Yes, it is.

[rarkins]

Maybe close this as a duplicate and copy over the links from here

[zharinov]

Desired functionality turned to be a part of another feature

[zharinov]

Probably should be done before #8692

[Churro]

PR #21892 introduces parsing support for Kotlin source files with object declarations like object X { ... } and single variable assignments, such as val dep = "..."

As of now, renovate doesn't recognize composite plugins explicitly and if you place e.g. a Deps.kt into a composite plugin outside of buildSrc, renovate wouldn't capture it. However, with the parsing support added with #21892, .kt files of composite plugins can be parsed in an opt-in fashion.

E.g., the following renovate config would match a file like includedBuild/dependencies/src/main/kotlin/com/badoo/reaktive/dependencies/Deps.kt (ex. here):

{
  "gradle": {
    "fileMatch": ["^includedBuild/.+\\.kt$"]
  }
}