Question

We have several independent builds (each independent build is a multi-project build). The main build scripts have become quite big as we have a set of common tasks reused by subprojects. There is also a lot of repetition between independent builds. What we are looking for is:

A way to split the main build file into smaller files
A way to reuse some parts of the build in other independent builds

What is the best way to achieve this in Gradle?

Answer 1

Gradle 0.9 allows you to import a build script from another build script. Have a look at: Configuring the project using an external build script. Basically it s apply from: other.gradle .

One thing the user guide doesn t mention is that the from parameter can be a URL, so you can make your shared scripts available via HTTP somewhere (eg your subversion repository), and import them from multiple builds.

Answer 2

The solution I found implies mapping the things you have in your other.gradle file.

def getVersionName = { testParam ->
    println "${testParam}"

    def stdout = new ByteArrayOutputStream()
    exec {
        commandLine  git ,  describe ,  --tags 
        standardOutput = stdout
    }
    return stdout.toString().trim()
}
ext{
    VERConsts = [:]
    VERConsts[ NAME ] = getVersionName("test param")
    VERConsts[ NAME_CALL ] = getVersionName
}

Then, in your build.gradle file:

apply from:  other.gradle 
// ...
android {
    defaultConfig {
        versionName VERConsts[ NAME_CALL ]("test param")
        // or
        versionName VERConsts[ NAME ]
    }
}

Then, the versionName will have the call result.

Notes:

VERConsts[ NAME ] = getVersionName() will call getVersionName() and store its result. Using it in your script e.g. versionName VERConsts[ NAME ] will then assign the stored value.
VERConsts[ NAME_CALL ] will instead store a reference to the function. Using VERConsts[ NAME_CALL ]() in your script will actually call the function and assign the result to your variable

The former will result in the same value being assigned across the script while the latter may result in different values (e.g. if someone pushes another version while your script is running).

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