// Copyright 2015 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.lib.bazel.rules.python;

import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration.Fragment;
import com.google.devtools.build.lib.analysis.config.BuildOptions;
import com.google.devtools.build.lib.analysis.config.ConfigurationEnvironment;
import com.google.devtools.build.lib.analysis.config.ConfigurationFragmentFactory;
import com.google.devtools.build.lib.analysis.config.FragmentOptions;
import com.google.devtools.build.lib.analysis.config.InvalidConfigurationException;
import com.google.devtools.build.lib.concurrent.ThreadSafety.Immutable;
import com.google.devtools.common.options.Option;

import javax.annotation.Nullable;

/**
 * Bazel-specific Python configuration.
 */
@Immutable
public class BazelPythonConfiguration extends BuildConfiguration.Fragment {

  /**
   * Bazel-specific Python configuration options.
   */
  public static final class Options extends FragmentOptions {
    @Option(name = "python2_path",
      defaultValue = "python",
      category = "version",
      help = "Local path to the Python2 executable.")
    public String python2Path;

    @Option(name = "python3_path",
      defaultValue = "python3",
      category = "version",
      help = "Local path to the Python3 executable.")
    public String python3Path;

    @Option(name = "experimental_python_import_all_repositories",
      defaultValue = "true",
      category = "undocumented",
      help = "Do not use.")
    public boolean experimentalPythonImportAllRepositories;
  }

  /**
   * Loader for the Bazel-specific Python configuration.
   */
  public static final class Loader implements ConfigurationFragmentFactory {
    @Nullable
    @Override
    public Fragment create(ConfigurationEnvironment env, BuildOptions buildOptions)
        throws InvalidConfigurationException {
      return new BazelPythonConfiguration(buildOptions.get(Options.class));
    }

    @Override
    public Class<? extends Fragment> creates() {
      return BazelPythonConfiguration.class;
    }

    @Override
    public ImmutableSet<Class<? extends FragmentOptions>> requiredOptions() {
      return ImmutableSet.<Class<? extends FragmentOptions>>of(Options.class);
    }
  }

  private final Options options;

  private BazelPythonConfiguration(Options options) {
    this.options = options;
  }

  public String getPython2Path() {
    return options.python2Path;
  }

  public String getPython3Path() {
    return options.python3Path;
  }

  public boolean getImportAllRepositories() {
    return options.experimentalPythonImportAllRepositories;
  }
}

@@ -1325,16 +1325,115 @@
 utable;%0A
+import com.google.devtools.build.lib.util.OS;%0Aimport com.google.devtools.common.options.Converter;%0A
 import c
@@ -1470,25 +1470,24 @@
 ons.Option;%0A
-%0A
 import javax
@@ -1645,16 +1645,442 @@
 ment %7B%0A%0A
+  /**%0A  * A path converter for python3 path%0A  */%0A  public static class Python3PathConverter implements Converter%3CString%3E %7B%0A    @Override%0A    public String convert(String input) %7B%0A      if (input.equals(%22auto%22)) %7B%0A        return OS.getCurrent() == OS.WINDOWS ? %22python%22 : %22python3%22;%0A      %7D%0A      return input;%0A    %7D%0A%0A    @Override%0A    public String getTypeDescription() %7B%0A      return %22An option for python3 path%22;%0A    %7D%0A  %7D%0A%0A
   /**%0A  
@@ -2379,32 +2379,39 @@
 h;%0A%0A    @Option(
+%0A      
 name = %22python3_
@@ -2409,32 +2409,78 @@
 %22python3_path%22,%0A
+      converter = Python3PathConverter.class,%0A
       defaultVal
@@ -2485,23 +2485,20 @@
 alue = %22
-python3
+auto
 %22,%0A     
@@ -2564,32 +2564,37 @@
 on3 executable.%22
+%0A    
 )%0A    public Str

Set default python3_path to python.exe on Windows