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/**
* Copyright 2009 Google Inc.
*
* Licensed 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 net.appjet.common.cli;
import org.apache.commons.lang.WordUtils;
class CliOption(val name: String, val description: String, val argName: Option[String]);
class ParseException(message: String) extends RuntimeException(message);
class CliParser(predef: Array[CliOption]) {
val displayWidth = 80;
val options = Map((for (opt <- predef) yield ((opt.name, opt))): _*);
def parseOptions(args0: Array[String]): (Map[String, String], Array[String]) = {
val (opts, args) = args0.partition(_.startsWith("-"));
(Map((for (arg <- opts) yield {
val parts = arg.split("=", 2);
val name = "-+".r.replaceFirstIn(parts(0), "");
if (parts.length == 1 && options.get(name).map(_.argName.isDefined).exists(x => x))
throw new ParseException("Missing argument for flag: "+name);
(name, parts.orElse(Map(1 -> "true"))(1));
}): _*),
args.toArray);
}
def dprint(prefix: String, value: String) = {
// println(prefix+": "+value+"\n");
value;
}
def usage = {
val sb = new StringBuilder();
var maxLength = predef.map(opt => 2 + opt.name.length + opt.argName.map(_.length + 1).getOrElse(0) ).reduceRight(Math.max)+2;
for ((n, opt) <- options) {
sb.append(" --"+n+opt.argName.map("=<"+_+">").getOrElse("")+"\n");
sb.append(" "+WordUtils.wrap(opt.description, displayWidth-5).split("\n").mkString("\n "));
sb.append("\n\n");
}
sb.toString();
}
}
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