Count the line count of source files

CountLines.groovy

/*
 *  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.
 */

if (!args) {
	println "Usage: groovy CountLines.groovy <dir> [extension1] [extensionN]"
	return
}

def extSet = (args.size() > 1 ? args[1..-1] : []).collect { it.toLowerCase() } as HashSet

def fileInfoList = []
new File(args[0]).eachFileRecurse {
	if (it.isDirectory()) return

	def ext = it.name.substring(it.name.lastIndexOf('.') + 1)
	
	if (extSet && !extSet.contains(ext.toLowerCase())) return
	
	fileInfoList << new Tuple2(ext, it.readLines().size())
}

fileInfoList.groupBy {
	it.v1
}.each { k, v ->
	println "${k}\t\t${ v.size() }\t\t${ v.sum(tuple -> tuple.v2)}"
}