golang.org/toolchain@v0.0.1-go1.9rc2.windows-amd64/src/cmd/vendor/github.com/google/pprof/internal/driver/options.go (about)

     1  // Copyright 2014 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  	"bufio"
    19  	"flag"
    20  	"fmt"
    21  	"io"
    22  	"os"
    23  	"strings"
    24  
    25  	"github.com/google/pprof/internal/binutils"
    26  	"github.com/google/pprof/internal/plugin"
    27  	"github.com/google/pprof/internal/symbolizer"
    28  )
    29  
    30  // setDefaults returns a new plugin.Options with zero fields sets to
    31  // sensible defaults.
    32  func setDefaults(o *plugin.Options) *plugin.Options {
    33  	d := &plugin.Options{}
    34  	if o != nil {
    35  		*d = *o
    36  	}
    37  	if d.Writer == nil {
    38  		d.Writer = oswriter{}
    39  	}
    40  	if d.Flagset == nil {
    41  		d.Flagset = goFlags{}
    42  	}
    43  	if d.Obj == nil {
    44  		d.Obj = &binutils.Binutils{}
    45  	}
    46  	if d.UI == nil {
    47  		d.UI = &stdUI{r: bufio.NewReader(os.Stdin)}
    48  	}
    49  	if d.Sym == nil {
    50  		d.Sym = &symbolizer.Symbolizer{Obj: d.Obj, UI: d.UI}
    51  	}
    52  	return d
    53  }
    54  
    55  // goFlags returns a flagset implementation based on the standard flag
    56  // package from the Go distribution. It implements the plugin.FlagSet
    57  // interface.
    58  type goFlags struct{}
    59  
    60  func (goFlags) Bool(o string, d bool, c string) *bool {
    61  	return flag.Bool(o, d, c)
    62  }
    63  
    64  func (goFlags) Int(o string, d int, c string) *int {
    65  	return flag.Int(o, d, c)
    66  }
    67  
    68  func (goFlags) Float64(o string, d float64, c string) *float64 {
    69  	return flag.Float64(o, d, c)
    70  }
    71  
    72  func (goFlags) String(o, d, c string) *string {
    73  	return flag.String(o, d, c)
    74  }
    75  
    76  func (goFlags) BoolVar(b *bool, o string, d bool, c string) {
    77  	flag.BoolVar(b, o, d, c)
    78  }
    79  
    80  func (goFlags) IntVar(i *int, o string, d int, c string) {
    81  	flag.IntVar(i, o, d, c)
    82  }
    83  
    84  func (goFlags) Float64Var(f *float64, o string, d float64, c string) {
    85  	flag.Float64Var(f, o, d, c)
    86  }
    87  
    88  func (goFlags) StringVar(s *string, o, d, c string) {
    89  	flag.StringVar(s, o, d, c)
    90  }
    91  
    92  func (goFlags) StringList(o, d, c string) *[]*string {
    93  	return &[]*string{flag.String(o, d, c)}
    94  }
    95  
    96  func (goFlags) ExtraUsage() string {
    97  	return ""
    98  }
    99  
   100  func (goFlags) Parse(usage func()) []string {
   101  	flag.Usage = usage
   102  	flag.Parse()
   103  	args := flag.Args()
   104  	if len(args) == 0 {
   105  		usage()
   106  	}
   107  	return args
   108  }
   109  
   110  type stdUI struct {
   111  	r *bufio.Reader
   112  }
   113  
   114  func (ui *stdUI) ReadLine(prompt string) (string, error) {
   115  	os.Stdout.WriteString(prompt)
   116  	return ui.r.ReadString('\n')
   117  }
   118  
   119  func (ui *stdUI) Print(args ...interface{}) {
   120  	ui.fprint(os.Stderr, args)
   121  }
   122  
   123  func (ui *stdUI) PrintErr(args ...interface{}) {
   124  	ui.fprint(os.Stderr, args)
   125  }
   126  
   127  func (ui *stdUI) IsTerminal() bool {
   128  	return false
   129  }
   130  
   131  func (ui *stdUI) SetAutoComplete(func(string) string) {
   132  }
   133  
   134  func (ui *stdUI) fprint(f *os.File, args []interface{}) {
   135  	text := fmt.Sprint(args...)
   136  	if !strings.HasSuffix(text, "\n") {
   137  		text += "\n"
   138  	}
   139  	f.WriteString(text)
   140  }
   141  
   142  // oswriter implements the Writer interface using a regular file.
   143  type oswriter struct{}
   144  
   145  func (oswriter) Open(name string) (io.WriteCloser, error) {
   146  	f, err := os.Create(name)
   147  	return f, err
   148  }