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// Copyright 2014 The Bazel Authors. All rights reserved.
//
// 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 com.google.devtools.build.docgen;
import com.google.devtools.build.lib.Constants;
import com.google.devtools.build.lib.analysis.ConfiguredRuleClassProvider;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
/**
* The main class for the docgen project. The class checks the input arguments
* and uses the BuildEncyclopediaProcessor for the actual documentation generation.
*/
public class BuildEncyclopediaGenerator {
private static boolean checkArgs(String[] args) {
if (args.length < 1) {
System.err.println("There has to be one or two input parameters\n"
+ " - a comma separated list for input directories\n"
+ " - an output directory (optional).");
return false;
}
return true;
}
private static void fail(Throwable e, boolean printStackTrace) {
System.err.println("ERROR: " + e.getMessage());
if (printStackTrace) {
e.printStackTrace();
}
Runtime.getRuntime().exit(1);
}
private static ConfiguredRuleClassProvider createRuleClassProvider()
throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException,
IllegalAccessException {
Class<?> providerClass = Class.forName(Constants.MAIN_RULE_CLASS_PROVIDER);
Method createMethod = providerClass.getMethod("create");
return (ConfiguredRuleClassProvider) createMethod.invoke(null);
}
public static void main(String[] args) {
if (checkArgs(args)) {
// TODO(bazel-team): use flags
try {
BuildEncyclopediaProcessor processor = new BuildEncyclopediaProcessor(
createRuleClassProvider());
processor.generateDocumentation(
args[0].split(","), getArgsOrNull(args, 1), getArgsOrNull(args, 2));
} catch (BuildEncyclopediaDocException e) {
fail(e, false);
} catch (Throwable e) {
fail(e, true);
}
}
}
private static String getArgsOrNull(String[] args, int idx) {
return args.length > idx ? args[idx] : null;
}
}
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