Gradle Custom buildScriptRepository methods - gradle

Question

I would like to make a custom buildScript repository method so I can easily reference our internal maven repo. Right now I'm required to declare a maven block everywhere we use our plugin.
Here is the current setup
buildscript {
repositories {
jcenter()
maven { url 'http://myNexus:8081/nexus/content/repositories/My-Release' }
}
dependencies {
classpath 'com.example.plugin:my-plugin:1+'
}
}
What I would like to do is something like this
buildscript {
repositories {
jcenter()
myReleaseRepo()
}
dependencies {
classpath 'com.example.plugin:my-plugin:1+'
}
}
How can I make a method available to create a repository anywhere we may use the plugin in the future?

Answer 1

Another solution is to add custom methods on RepositoryHandler using some Groovy goodness. Just chuck this in ~/.gradle/init.gradle
RepositoryHandler.metaClass.myReleaseRepo = {
delegate.maven {
name 'myReleaseRepo'
url 'http://myNexus:8081/nexus/content/repositories/My-Release'
}
}
After that, you can use it just as you described:
buildscript {
repositories {
myReleaseRepo()
}
}
Metaclasses in Groovy are just great. The delegate in this case is pretty much like the javascript this. This code is essentially using the RepositoryHandler instance (delegate keyword) and just calling repositoryHandlerInstance.maven(name, url).

Answer 2

It is possible to add a repo to an init script which would then apply to all gradle invocations that use the init script - without having to individually declare your maven repo in each build.gradle.
Solution 1:
Partial solution, does not do exactly what you're asking for. In init.gradle:
allprojects{
buildscript{
repositories{
maven{ url 'http://myNexus:8081/nexus/content/repositories/My-Release' }
}
}
}
Then your build.gradle can skip buildscript repo declaration entirely:
buildscript {
dependencies {
classpath 'com.example.plugin:my-plugin:1+'
}
}
Solution 2:
In fact, you can even move your buildscript classpath declaration to init and have the plugin apply to all projects that use the init script:
beefier init.gradle
allprojects{
buildscript{
repositories{
maven{ url 'http://myNexus:8081/nexus/content/repositories/My-Release' }
}
dependencies {
classpath 'com.example.plugin:my-plugin:1+'
}
}
}
gives you a lighter build.gradle
apply plugin: 'my-plugin'
I tried to, but apparently you cannot move the apply line to init.gradle as well. see this defect.
Solution 3:
I retract what I said in the comment above, I figured out how to do exactly what you're asking for. Apparently you can create extensions for the buildscript block using the initscript. However I still prefer solution2, because it gives you a cleaner build.gradle.
To create a buildscript extension, in your init.gradle:
class customRepos {
def buildscript
customRepos(buildscript) {
this.buildscript = buildscript
}
void addMyRepo() {
buildscript.repositories {
maven{ url 'http://myNexus:8081/nexus/content/repositories/My-Release' }
}
}
}
allprojects {
extensions.create('myRepo', customRepos, buildscript)
}
which then allows you to do this in your build.gradle
buildscript{
myRepo.addMyRepo()
dependencies {
classpath 'com.example.plugin:my-plugin:1+'
}
}
apply plugin: 'my-plugin'