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@toby55kij
Created September 5, 2022 11:13
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JBangを利用したサンプルプログラム(フォルダ内にある全てのファイルについてバイト数を表示)
///usr/bin/env jbang "$0" "$@" ; exit $?
//DEPS info.picocli:picocli:4.6.3
//JAVA 11+
import picocli.CommandLine;
import picocli.CommandLine.Command;
import picocli.CommandLine.Parameters;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.concurrent.Callable;
import java.util.stream.Stream;
@Command(name = "PrintSize", mixinStandardHelpOptions = true, version = "PrintSize 0.1",
description = "Print file size")
class PrintSize implements Callable<Integer> {
@Parameters(index = "0", description = "file path", defaultValue = ".")
private Path path;
@CommandLine.Option(names = {"-d", "--delimiter"}, defaultValue = "\t",
description = "delimiter (default: \\t)")
private String delimiter;
public static void main(String... args) {
int exitCode = new CommandLine(new PrintSize()).execute(args);
System.exit(exitCode);
}
@Override
public Integer call() {
printFileSize(path.normalize().toAbsolutePath());
return 0;
}
private void printFileSize(final Path path) {
try {
if (Files.isDirectory(path)) {
printFolders(path);
} else {
System.out.printf("%s%s%d%n", path, delimiter, Files.size(path));
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private void printFolders(final Path path) throws IOException {
try (Stream<Path> children = Files.list(path)) {
children.forEachOrdered(this::printFileSize);
}
}
}
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