PwmTraverse using Files.walk()

PwmTraverse.java

///usr/bin/env jbang "$0" "$@" ; exit $?

import java.nio.file.*;
import java.io.IOException;

public class PwmTraverse {
    public static void main(String[] args) throws IOException {
        Path root = Paths.get("/sys/class/pwm");
        if (!Files.exists(root)) {
            System.err.println("Path does not exist: " + root);
            System.exit(1);
        }

        Files.walk(root).forEach(p -> {
            try {
                boolean isSymlink = Files.isSymbolicLink(p);
                boolean isDirNoFollow = Files.isDirectory(p, LinkOption.NOFOLLOW_LINKS);

                if (isSymlink) {
                    Path linkTarget = Files.readSymbolicLink(p);
                    Path resolved = (p.getParent() == null ? linkTarget : p.getParent().resolve(linkTarget)).normalize();

                    String resolvedKind = kindOf(resolved); // follows to see what it points at
                    String selfKind = isDirNoFollow ? "dir-symlink" : "file-symlink";

                    System.out.println(formatDir(p, isDirNoFollow) + " (" + selfKind + ") -> " +
                            linkTarget + " (resolves to " + resolved + (resolvedKind.isEmpty() ? "" : ", " + resolvedKind) + ")");
                } else if (isDirNoFollow) {
                    System.out.println(formatDir(p, true));
                } else {
                    System.out.println(p.toString());
                }
            } catch (IOException e) {
                System.out.println(p + " [unreadable]");
            }
        });
    }

    private static String kindOf(Path path) {
        try {
            if (Files.isDirectory(path)) return "dir";
            if (Files.isRegularFile(path)) return "file";
            if (Files.exists(path)) return "other";
            return "dangling";
        } catch (Exception e) {
            return "";
        }
    }

    private static String formatDir(Path p, boolean isDir) {
        return isDir ? p.toString() + "/" : p.toString();
    }
}