go options 源码
golang options 代码
文件路径：/src/cmd/vendor/github.com/google/pprof/internal/driver/options.go
// Copyright 2014 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 (
"bufio"
"fmt"
"io"
"os"
"strings"
"github.com/google/pprof/internal/binutils"
"github.com/google/pprof/internal/plugin"
"github.com/google/pprof/internal/symbolizer"
"github.com/google/pprof/internal/transport"
)
// setDefaults returns a new plugin.Options with zero fields sets to
// sensible defaults.
func setDefaults(o *plugin.Options) *plugin.Options {
d := &plugin.Options{}
if o != nil {
*d = *o
}
if d.Writer == nil {
d.Writer = oswriter{}
}
if d.Flagset == nil {
d.Flagset = &GoFlags{}
}
if d.Obj == nil {
d.Obj = &binutils.Binutils{}
}
if d.UI == nil {
d.UI = &stdUI{r: bufio.NewReader(os.Stdin)}
}
if d.HTTPTransport == nil {
d.HTTPTransport = transport.New(d.Flagset)
}
if d.Sym == nil {
d.Sym = &symbolizer.Symbolizer{Obj: d.Obj, UI: d.UI, Transport: d.HTTPTransport}
}
return d
}
type stdUI struct {
r *bufio.Reader
}
func (ui *stdUI) ReadLine(prompt string) (string, error) {
os.Stdout.WriteString(prompt)
return ui.r.ReadString('\n')
}
func (ui *stdUI) Print(args ...interface{}) {
ui.fprint(os.Stderr, args)
}
func (ui *stdUI) PrintErr(args ...interface{}) {
ui.fprint(os.Stderr, args)
}
func (ui *stdUI) IsTerminal() bool {
return false
}
func (ui *stdUI) WantBrowser() bool {
return true
}
func (ui *stdUI) SetAutoComplete(func(string) string) {
}
func (ui *stdUI) fprint(f *os.File, args []interface{}) {
text := fmt.Sprint(args...)
if !strings.HasSuffix(text, "\n") {
text += "\n"
}
f.WriteString(text)
}
// oswriter implements the Writer interface using a regular file.
type oswriter struct{}
func (oswriter) Open(name string) (io.WriteCloser, error) {
f, err := os.Create(name)
return f, err
}
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