1 files changed, 56 insertions, 0 deletions
diff --git a/trunk/infrastructure/net.appjet.common.cli/cli.scala b/trunk/infrastructure/net.appjet.common.cli/cli.scala
new file mode 100644
index 0000000..ef9223f
--- /dev/null
+++ b/trunk/infrastructure/net.appjet.common.cli/cli.scala
@@ -0,0 +1,56 @@
+/**
+ * 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();
+  }
+}