On 9/16/16 5:07 PM, Patrick Pelletier wrote:
I'm not quite sure how it's supposed to know that the Frege-generated Java files are in src/frege, so I tried adding:


    sourceSets {
        main {
            java.srcDirs.add 'src/frege'
        }
    }

but that didn't seem to do anything.

Well, this was me not understanding Gradle/Groovy. It turns out the correct incantation was:

    sourceSets {
        main {
            java.srcDirs += 'src/frege'
        }
    }

With this change, it worked! I now have a successful example of an Android app that calls Frege code. It is available at this point in my repository:

https://github.com/ppelleti/frege-on-android/tree/3e4685f078cdce3f8b704b779d0b05e72d6cffe6

However, I didn't want to leave it there. I wanted my Frege code to be able to call the Android API. So, I took a look at the FregeAndroid repository:

https://github.com/trilogysci/FregeAndroid
http://permalink.gmane.org/gmane.comp.lang.frege.general/177

It doesn't have any build instructions, so I just added it as a submodule of my repository, and added code to my build.gradle to build FregeAndroid along with my own Frege code:

project.afterEvaluate {
    extensions.compileFrege = {
        mkdir 'src/frege'
        description = 'Compile Frege to Java'
        def tree = fileTree(dir: 'FregeAndroid/src', include: '**/*.fr')
        tree += fileTree(dir: 'src/main/frege', include: '**/*.fr')
        tree.each { file ->
            javaexec {
                configurations.compile.resolve().each {
                    //println it.toString()
                    classpath += files(it.toString())
                }
                main = 'frege.compiler.Main'
args '-inline', '-d', 'src/frege', '-make', '-sp', 'src/main/frege', "$file.path"
            }
        }
//        delete fileTree('src/frege') {
//            include '**/*.java'
//        }
    }

Although I'm still sketchy on Groovy, I think this is doing what I want, in terms of trying to build the FregeAndroid files. However, the files don't actually build. I get:

:compileDebugJavaWithJavac
E /Users/ppelleti/programming/android/example/FregeAndroid/src/frege/android/animation/TimeInterpolator.fr:4: `android.animation.TimeInterpolator` is not a known java class Android.animation.TimeInterpolator: build failed because of compilation errors.
Build failed.
runtime 2.801 wallclock seconds.
:compileDebugJavaWithJavac FAILED

FAILURE: Build failed with an exception.

So, I think the problem is that the Frege compiler isn't seeing the Android API classes. I guess I need to somehow put the Android API on the Frege compiler's classpath? I'll look into this, but I wanted to post what I have so far, in case anyone has any ideas:

https://github.com/ppelleti/frege-on-android/tree/f92becc38c23129ea0e424909e96354fb8ceea2e

Thanks,

--Patrick


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