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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.analysis.ConfiguredRuleClassProvider;
import com.google.devtools.common.options.OptionsParser;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collections;
/**
* 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 void printUsage(OptionsParser parser) {
System.err.println(
"Usage: docgen_bin -n product_name -p rule_class_provider (-i input_dir)+\n"
+ " [-o outputdir] [-b blacklist] [-1] [-h]\n\n"
+ "Generates the Build Encyclopedia from embedded native rule documentation.\n"
+ "The product name (-n), rule class provider (-p) and at least one input_dir\n"
+ "(-i) must be specified.\n");
System.err.println(
parser.describeOptionsWithDeprecatedCategories(
Collections.<String, String>emptyMap(), OptionsParser.HelpVerbosity.LONG));
}
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(String classProvider)
throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException,
IllegalAccessException {
Class<?> providerClass = Class.forName(classProvider);
Method createMethod = providerClass.getMethod("create");
return (ConfiguredRuleClassProvider) createMethod.invoke(null);
}
public static void main(String[] args) {
OptionsParser parser = OptionsParser.newOptionsParser(BuildEncyclopediaOptions.class);
parser.setAllowResidue(false);
parser.parseAndExitUponError(args);
BuildEncyclopediaOptions options = parser.getOptions(BuildEncyclopediaOptions.class);
if (options.help) {
printUsage(parser);
Runtime.getRuntime().exit(0);
}
if (options.productName.isEmpty()
|| options.inputDirs.isEmpty()
|| options.provider.isEmpty()) {
printUsage(parser);
Runtime.getRuntime().exit(1);
}
try {
BuildEncyclopediaProcessor processor = null;
if (options.singlePage) {
processor =
new SinglePageBuildEncyclopediaProcessor(
options.productName, createRuleClassProvider(options.provider));
} else {
processor =
new MultiPageBuildEncyclopediaProcessor(
options.productName, createRuleClassProvider(options.provider));
}
processor.generateDocumentation(
options.inputDirs, options.outputDir, options.blacklist);
} catch (BuildEncyclopediaDocException e) {
fail(e, false);
} catch (Throwable e) {
fail(e, true);
}
}
}
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