Build PlantUML files from Gradle

build.gradle

apply plugin:'groovy'
repositories {
mavenCentral()
}

dependencies{
    implementation 'org.codehaus.groovy:groovy:3.0.4'
    implementation 'net.sourceforge.plantuml:plantuml:8059'
}

sourceSets {
    main{
        groovy {
            srcDirs=['.']
        }
    }
}

task generateSequences {
    List<String> fileArgs = new ArrayList<>();

    plantumlFiles().each { File file ->
        logger.debug("registering file input: {}", file);
        inputs.file file;

        File outputFile = getOutputFile(file);
        logger.debug("registering file output: {}", outputFile);
        outputs.file outputFile
        logger.quiet("${file.name} -> ${outputFile.name}")

        fileArgs.add(file.canonicalPath);
        fileArgs.add(outputFile.canonicalPath)
    }

    task buildSequences (dependsOn:classes, type:JavaExec) {
        main='build-sequence'
        classpath = sourceSets.main.runtimeClasspath
        args=fileArgs
    }

    generateSequences.dependsOn(buildSequences)
}


File[] plantumlFiles() {
    ConfigurableFileTree tree = fileTree(dir: './')
    tree.include '**/*.puml'
    tree.getFiles()
}

File getOutputFile(File file) {
  File path = file.getParentFile();
  String inputFileName = file.name;
  String inputFileNameWithoutExtension = file.name.substring(0, file.name.lastIndexOf(".puml"));
  String outputfileName = inputFileNameWithoutExtension + ".svg";
  return new File(path, outputfileName);
}