Print build directory structure

directorystructure.build.gradle

tasks.withType(Jar).configureEach { task ->
    doFirst {
        buildScan.value("Jar doFirst ${task.name}", printDirectoryTree(buildDir.path))
    }
}

/**
* Pretty print the directory tree and its file names.
*
* @param path
* @return
*/
static String printDirectoryTree(String path) {
    File folder = new File(path);
    if (!folder.isDirectory()) {
        throw new IllegalArgumentException("folder is not a Directory");
    }
    int indent = 0;
    StringBuilder sb = new StringBuilder();
    printDirectoryTreeRecurse(folder, indent, sb);
    return sb.toString();
}

private static void printDirectoryTreeRecurse(File folder, int indent, StringBuilder sb) {

    if (folder != null && folder.isDirectory() && folder.listFiles() != null) {
        sb.append(getIndentString(indent));
        sb.append("+--");
        sb.append(folder.getName());
        sb.append("/");
        sb.append("\n");

        for (File file : folder.listFiles()) {
            if (file.isDirectory()) {
                printDirectoryTreeRecurse(file, indent + 1, sb);
            } else {
                printFile(file, indent + 1, sb);
            }
        }
    }
}

private static void printFile(File file, int indent, StringBuilder sb) {
    sb.append(getIndentString(indent));
    sb.append("+--");
    if (file != null) {
        sb.append(file.getName());
    } else {
        sb.append("null file name");
    }
    sb.append("\n");
}

private static String getIndentString(int indent) {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < indent; i++) {
        sb.append("|  ");
    }
    return sb.toString();
}