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-rw-r--r--infrastructure/net.appjet.common.cli/cli.scala56
1 files changed, 56 insertions, 0 deletions
diff --git a/infrastructure/net.appjet.common.cli/cli.scala b/infrastructure/net.appjet.common.cli/cli.scala
new file mode 100644
index 0000000..ef9223f
--- /dev/null
+++ b/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();
+ }
+}