flags.go

     1  //  Copyright 2018 Google Inc. All Rights Reserved.
     2  //
     3  //  Licensed under the Apache License, Version 2.0 (the "License");
     4  //  you may not use this file except in compliance with the License.
     5  //  You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  //  Unless required by applicable law or agreed to in writing, software
    10  //  distributed under the License is distributed on an "AS IS" BASIS,
    11  //  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  //  See the License for the specific language governing permissions and
    13  //  limitations under the License.
    14  
    15  package driver
    16  
    17  import (
    18  	"flag"
    19  	"strings"
    20  )
    21  
    22  // GoFlags implements the plugin.FlagSet interface.
    23  type GoFlags struct {
    24  	UsageMsgs []string
    25  }
    26  
    27  // Bool implements the plugin.FlagSet interface.
    28  func (*GoFlags) Bool(o string, d bool, c string) *bool {
    29  	return flag.Bool(o, d, c)
    30  }
    31  
    32  // Int implements the plugin.FlagSet interface.
    33  func (*GoFlags) Int(o string, d int, c string) *int {
    34  	return flag.Int(o, d, c)
    35  }
    36  
    37  // Float64 implements the plugin.FlagSet interface.
    38  func (*GoFlags) Float64(o string, d float64, c string) *float64 {
    39  	return flag.Float64(o, d, c)
    40  }
    41  
    42  // String implements the plugin.FlagSet interface.
    43  func (*GoFlags) String(o, d, c string) *string {
    44  	return flag.String(o, d, c)
    45  }
    46  
    47  // StringList implements the plugin.FlagSet interface.
    48  func (*GoFlags) StringList(o, d, c string) *[]*string {
    49  	return &[]*string{flag.String(o, d, c)}
    50  }
    51  
    52  // ExtraUsage implements the plugin.FlagSet interface.
    53  func (f *GoFlags) ExtraUsage() string {
    54  	return strings.Join(f.UsageMsgs, "\n")
    55  }
    56  
    57  // AddExtraUsage implements the plugin.FlagSet interface.
    58  func (f *GoFlags) AddExtraUsage(eu string) {
    59  	f.UsageMsgs = append(f.UsageMsgs, eu)
    60  }
    61  
    62  // Parse implements the plugin.FlagSet interface.
    63  func (*GoFlags) Parse(usage func()) []string {
    64  	flag.Usage = usage
    65  	flag.Parse()
    66  	args := flag.Args()
    67  	if len(args) == 0 {
    68  		usage()
    69  	}
    70  	return args
    71  }
    72
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