Source file src/cmd/vendor/github.com/google/pprof/internal/driver/options.go

     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		"fmt"
    20		"io"
    21		"os"
    22		"strings"
    23	
    24		"github.com/google/pprof/internal/binutils"
    25		"github.com/google/pprof/internal/plugin"
    26		"github.com/google/pprof/internal/symbolizer"
    27		"github.com/google/pprof/internal/transport"
    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.HTTPTransport == nil {
    50			d.HTTPTransport = transport.New(d.Flagset)
    51		}
    52		if d.Sym == nil {
    53			d.Sym = &symbolizer.Symbolizer{Obj: d.Obj, UI: d.UI, Transport: d.HTTPTransport}
    54		}
    55		return d
    56	}
    57	
    58	type stdUI struct {
    59		r *bufio.Reader
    60	}
    61	
    62	func (ui *stdUI) ReadLine(prompt string) (string, error) {
    63		os.Stdout.WriteString(prompt)
    64		return ui.r.ReadString('\n')
    65	}
    66	
    67	func (ui *stdUI) Print(args ...interface{}) {
    68		ui.fprint(os.Stderr, args)
    69	}
    70	
    71	func (ui *stdUI) PrintErr(args ...interface{}) {
    72		ui.fprint(os.Stderr, args)
    73	}
    74	
    75	func (ui *stdUI) IsTerminal() bool {
    76		return false
    77	}
    78	
    79	func (ui *stdUI) WantBrowser() bool {
    80		return true
    81	}
    82	
    83	func (ui *stdUI) SetAutoComplete(func(string) string) {
    84	}
    85	
    86	func (ui *stdUI) fprint(f *os.File, args []interface{}) {
    87		text := fmt.Sprint(args...)
    88		if !strings.HasSuffix(text, "\n") {
    89			text += "\n"
    90		}
    91		f.WriteString(text)
    92	}
    93	
    94	// oswriter implements the Writer interface using a regular file.
    95	type oswriter struct{}
    96	
    97	func (oswriter) Open(name string) (io.WriteCloser, error) {
    98		f, err := os.Create(name)
    99		return f, err
   100	}
   101	

View as plain text