// copied from apache-solr-4.7.0
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.solr.crunch;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.UnsupportedEncodingException;
import net.sourceforge.argparse4j.ArgumentParsers;
import net.sourceforge.argparse4j.helper.ASCIITextWidthCounter;
import net.sourceforge.argparse4j.helper.TextHelper;
import org.apache.hadoop.util.ToolRunner;
/**
* Nicely formats the output of
* {@link ToolRunner#printGenericCommandUsage(java.io.PrintStream) with the same look and feel that argparse4j uses for help text.
*/
final class ToolRunnerHelpFormatter {
public static String getGenericCommandUsage() {
ByteArrayOutputStream bout = new ByteArrayOutputStream();
String msg;
try {
ToolRunner.printGenericCommandUsage(new PrintStream(bout, true, "UTF-8"));
msg = new String(bout.toByteArray(), "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e); // unreachable
}
BufferedReader reader = new BufferedReader(new StringReader(msg));
StringBuilder result = new StringBuilder();
while (true) {
String line;
try {
line = reader.readLine();
} catch (IOException e) {
throw new RuntimeException(e); // unreachable
}
if (line == null) {
return result.toString(); // EOS
}
if (!line.startsWith("-")) {
result.append(line + "\n");
} else {
line = line.trim();
int i = line.indexOf(" ");
if (i < 0) {
i = line.indexOf('\t');
}
if (i < 0) {
result.append(line + "\n");
} else {
String title = line.substring(0, i).trim();
if (title.length() >= 3 && Character.isLetterOrDigit(title.charAt(1)) && Character.isLetterOrDigit(title.charAt(2))) {
title = "-" + title; // prefer "--libjars" long arg style over "-libjars" style but retain "-D foo" short arg style
}
String help = line.substring(i, line.length()).trim();
StringWriter strWriter = new StringWriter();
PrintWriter writer = new PrintWriter(strWriter, true);
TextHelper.printHelp(writer, title, help, new ASCIITextWidthCounter(), ArgumentParsers.getFormatWidth());
result.append(strWriter.toString());
}
}
}
}
}