How to share a global variable in a splitted gradle script

Help/Discuss
1

Given this minimal example:

File build.gradle

apply from: 'foo.gradle'    
def tmp = [ 1, 2, 3 ]

File foo.gradle

task myTask {
            tmp.each { item ->
                    println(item)
            }
}

When I run gradle myTask the variable tmp can not be accessed. I tried to put it in and read from project.ext. I also tried to put the variable within buildscript { } because I read that this part is executed first because it sets the classpath for the execution or something like this.

I learnt that apply from: ‘foo.bar’ is not like including the text in there. Each seems to exist in its own variable scope.

My questions:

  1. What is the reason that I cannot access the variable within the task defined in foo.gradle?
  2. Is there a way to achive what I try here? To split a build.gradle in several files that exist in the same variable scope.
2

Hey,

each script plugin has it’s variable scope and even its own
classloader. What you can do is to assign that variable as a project
extension:

File build.gradle

apply from: 'scriptplugin.gradle'

ext.tmp = [ 1, 2, 3 ]

File foo.gradle

task myTask {
    doLast {
    tmp.each { item ->
        println(item)
}
}

the ordering plays a role here. if you want to use the tmp field in the
script plugin during configuration phase, you need to ensure the
extension is already added.

3

Thanks a lot for that hint! I tried to put it in ext, but was not aware to work with the variable in doLast do make sure it has been assigned.

Is there a more detailed documentation about the build and execution phases? In special what task parts are run in what phase?

I found:
https://gradle.org/docs/current/userguide/build_lifecycle.html

But this is a very short explaination, and if possible I don’t want to extract this infos from gradle source codes.

Edit: Found this link http://stackoverflow.com/questions/24638691/when-gradles-hooks-are-added-in-build-lifecycle. Are any other resources known?

4

You might want to have a look at the free available book “building & testing with gradle”. It is available here https://gradle.org/books/ and it is really a good and comprehensive introduction to gradle.