tools/product_config/src/com/android/build/config/Main.java

/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * 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.android.build.config;

import java.util.List;
import java.util.Map;
import java.util.TreeSet;

public class Main {
    private final Errors mErrors;
    private final Options mOptions;

    public Main(Errors errors, Options options) {
        mErrors = errors;
        mOptions = options;
    }

    void run() {
        System.out.println("Hello World");

        // TODO: Check the build environment to make sure we're running in a real
        // build environment, e.g. actually inside a source tree, with TARGET_PRODUCT
        // and TARGET_BUILD_VARIANT defined, etc.
        Kati kati = new KatiImpl(mErrors, mOptions);
        MakeConfig makeConfig = kati.loadProductConfig();
        if (makeConfig == null || mErrors.hadError()) {
            return;
        }

        System.out.println();
        System.out.println("====================");
        System.out.println("PRODUCT CONFIG FILES");
        System.out.println("====================");
        makeConfig.printToStream(System.out);

        ConvertMakeToGenericConfig m2g = new ConvertMakeToGenericConfig(mErrors);
        GenericConfig generic = m2g.convert(makeConfig);

        System.out.println("======================");
        System.out.println("REGENERATED MAKE FILES");
        System.out.println("======================");
        MakeWriter.write(System.out, generic, 0);

        // TODO: Run kati and extract the variables and convert all that into starlark files.

        // TODO: Run starlark with all the generated ones and the hand written ones.

        // TODO: Get the variables that were defined in starlark and use that to write
        // out the make, soong and bazel input files.
    }

    public static void main(String[] args) {
        Errors errors = new Errors();
        int exitCode = 0;

        try {
            Options options = Options.parse(errors, args, System.getenv());
            if (errors.hadError()) {
                Options.printHelp(System.err);
                System.err.println();
                throw new CommandException();
            }

            switch (options.getAction()) {
                case DEFAULT:
                    (new Main(errors, options)).run();
                    return;
                case HELP:
                    Options.printHelp(System.out);
                    return;
            }
        } catch (CommandException | Errors.FatalException ex) {
            // These are user errors, so don't show a stack trace
            exitCode = 1;
        } catch (Throwable ex) {
            // These are programming errors in the code of this tool, so print the exception.
            // We'll try to print this.  If it's something unrecoverable, then we'll hope
            // for the best. We will still print the errors below, because they can be useful
            // for debugging.
            ex.printStackTrace(System.err);
            System.err.println();
            exitCode = 1;
        } finally {
            // Print errors and warnings
            errors.printErrors(System.err);
        }
        System.exit(exitCode);
    }
}