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prompter.go
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prompter.go
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// Copyright 2015 Keybase, Inc. All rights reserved. Use of
// this source code is governed by the included BSD license.
package client
import (
"strings"
"github.com/keybase/client/go/libkb"
)
type Field struct {
Name string
Prompt string
FirstPrompt string
Defval string
Hint string
Checker *libkb.Checker
Thrower func(key, value string) error
Disabled bool
Value *string
PromptDescriptor libkb.PromptDescriptor
}
func (f Field) GetValue() string {
if f.Value == nil {
return ""
}
return *f.Value
}
type Prompter struct {
Fields []*Field
tui libkb.TerminalUI
}
func NewPrompter(f []*Field, tui libkb.TerminalUI) *Prompter {
return &Prompter{Fields: f, tui: tui}
}
func (p *Prompter) Run() error {
for _, f := range p.Fields {
if f.Disabled {
continue
}
if err := p.ReadField(f); err != nil {
return err
}
}
return nil
}
func (f *Field) Clear() string {
old := f.GetValue()
f.Value = nil
return old
}
func (p *Prompter) ReadField(f *Field) (err error) {
done := false
first := true
var val string
if p.tui == nil {
return NoTerminalError{}
}
for !done && err == nil {
prompt := f.Prompt
if first {
if len(f.FirstPrompt) > 0 {
prompt += f.FirstPrompt
}
first = false
} else {
hint := f.Hint
if len(hint) == 0 {
hint = f.Checker.Hint
}
prompt += " (" + hint + ")"
}
var def string
if len(f.Defval) > 0 {
def = f.Defval
} else if f.Value != nil {
def = *f.Value
}
if len(def) > 0 {
prompt += " [" + def + "]"
}
prompt += ": "
if val, err = p.tui.Prompt(f.PromptDescriptor, prompt); err != nil {
break
}
if len(val) == 0 && len(def) > 0 {
val = def
}
if f.Checker == nil || !f.Checker.PreserveSpace {
val = strings.TrimSpace(val)
}
if f.Thrower != nil {
if err = f.Thrower(f.Name, val); err != nil {
break
}
}
if f.Checker != nil {
if f.Checker.Transform != nil {
val = f.Checker.Transform(val)
}
done = f.Checker.F(val)
} else {
done = true
}
if done {
f.Value = &val
}
}
if err == nil {
f.Value = &val
}
return
}