go flags 源码
golang flags 代码
文件路径：/src/cmd/vendor/github.com/google/pprof/internal/driver/flags.go
// Copyright 2018 Google Inc. 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 driver
import (
"flag"
"strings"
)
// GoFlags implements the plugin.FlagSet interface.
type GoFlags struct {
UsageMsgs []string
}
// Bool implements the plugin.FlagSet interface.
func (*GoFlags) Bool(o string, d bool, c string) *bool {
return flag.Bool(o, d, c)
}
// Int implements the plugin.FlagSet interface.
func (*GoFlags) Int(o string, d int, c string) *int {
return flag.Int(o, d, c)
}
// Float64 implements the plugin.FlagSet interface.
func (*GoFlags) Float64(o string, d float64, c string) *float64 {
return flag.Float64(o, d, c)
}
// String implements the plugin.FlagSet interface.
func (*GoFlags) String(o, d, c string) *string {
return flag.String(o, d, c)
}
// StringList implements the plugin.FlagSet interface.
func (*GoFlags) StringList(o, d, c string) *[]*string {
return &[]*string{flag.String(o, d, c)}
}
// ExtraUsage implements the plugin.FlagSet interface.
func (f *GoFlags) ExtraUsage() string {
return strings.Join(f.UsageMsgs, "\n")
}
// AddExtraUsage implements the plugin.FlagSet interface.
func (f *GoFlags) AddExtraUsage(eu string) {
f.UsageMsgs = append(f.UsageMsgs, eu)
}
// Parse implements the plugin.FlagSet interface.
func (*GoFlags) Parse(usage func()) []string {
flag.Usage = usage
flag.Parse()
args := flag.Args()
if len(args) == 0 {
usage()
}
return args
}
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