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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package com.android.dialer.commandline.impl;
     18 
     19 import android.content.Context;
     20 import android.support.annotation.NonNull;
     21 import com.android.dialer.commandline.Arguments;
     22 import com.android.dialer.commandline.Command;
     23 import com.android.dialer.commandline.CommandLineComponent;
     24 import com.android.dialer.inject.ApplicationContext;
     25 import com.google.common.collect.ImmutableMap;
     26 import com.google.common.util.concurrent.Futures;
     27 import com.google.common.util.concurrent.ListenableFuture;
     28 import java.util.Locale;
     29 import java.util.Map.Entry;
     30 import java.util.concurrent.ExecutionException;
     31 import javax.inject.Inject;
     32 
     33 /** List available commands */
     34 public class Help implements Command {
     35 
     36   @NonNull
     37   @Override
     38   public String getShortDescription() {
     39     return "Print this message";
     40   }
     41 
     42   @NonNull
     43   @Override
     44   public String getUsage() {
     45     return "help";
     46   }
     47 
     48   private final Context context;
     49 
     50   @Inject
     51   Help(@ApplicationContext Context context) {
     52     this.context = context;
     53   }
     54 
     55   @Override
     56   public ListenableFuture<String> run(Arguments args) throws IllegalCommandLineArgumentException {
     57     boolean showHidden = args.getFlags().containsKey("showHidden");
     58 
     59     StringBuilder stringBuilder = new StringBuilder();
     60     ImmutableMap<String, Command> commands =
     61         CommandLineComponent.get(context).commandSupplier().get();
     62     stringBuilder
     63         .append(runOrThrow(commands.get("version")))
     64         .append("\n")
     65         .append("\n")
     66         .append("usage: <command> [args...]\n")
     67         .append("\n")
     68         .append("<command>\n");
     69 
     70     for (Entry<String, Command> entry : commands.entrySet()) {
     71       String description = entry.getValue().getShortDescription();
     72       if (!showHidden && description.startsWith("@hide ")) {
     73         continue;
     74       }
     75       stringBuilder.append(String.format(Locale.US, "  %20s  %s\n", entry.getKey(), description));
     76     }
     77 
     78     return Futures.immediateFuture(stringBuilder.toString());
     79   }
     80 
     81   private static String runOrThrow(Command command) throws IllegalCommandLineArgumentException {
     82     try {
     83       return command.run(Arguments.EMPTY).get();
     84     } catch (InterruptedException e) {
     85       Thread.interrupted();
     86       throw new RuntimeException(e);
     87     } catch (ExecutionException e) {
     88       throw new RuntimeException(e);
     89     }
     90   }
     91 }
     92