apply plugin: 'c'

task idl(type: DummyIdlCompiler) {
    idlFiles = project.fileTree("src/main/idl")
    headerDir = project.file("${buildDir}/src/generated/headers")
    sourceDir = project.file("${buildDir}/src/generated/c")
}


model {
    components {
        main(NativeExecutableSpec) {
            sources {
                idlOutput(CSourceSet) {
                    generatedBy tasks.idl
                }
                c.lib sources.idlOutput
            }
        }
    }
}


class DummyIdlCompiler extends DefaultTask {
    @InputFiles FileCollection idlFiles
    @OutputDirectory File headerDir
    @OutputDirectory File sourceDir

    @TaskAction
    void processIdlFiles() {
        idlFiles.each { File idlFile ->
            def baseName = idlFile.name - '.idl'
            File headerFile = new File(headerDir, "${baseName}.h")
            File sourceFile = new File(sourceDir, "${baseName}.c")
            processIdlFile(idlFile, headerFile, sourceFile)
        }
    }

    def processIdlFile(File idlFile, File headerFile, File sourceFile) {
        def pattern = ~/(?s).*HEADER <<<(.*)>>>.*SOURCE <<<(.*)>>>.*/
        def matcher = pattern.matcher(idlFile.text)
        assert matcher.matches()
        headerFile.text = matcher.group(1)
        sourceFile.text = matcher.group(2)
    }
}