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ask_util.go
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/
ask_util.go
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package cmd
import (
"fmt"
"gopkg.in/readline.v1"
"strings"
)
type AskOptions struct {
Candidates []string
Validate func(string) error
Default string
}
func AskForRequiredInput(prompt string, opts ...AskOptions) string {
pcItems := []readline.PrefixCompleterInterface{}
validate := func(item string) error { return nil }
defaultValue := ""
if len(opts) > 0 {
o := opts[0]
for _, c := range o.Candidates {
pcItems = append(pcItems, readline.PcItem(c))
}
if o.Validate != nil {
validate = o.Validate
}
if o.Default != "" {
defaultValue = o.Default
}
}
var completer = readline.NewPrefixCompleter(
pcItems...,
)
fullPrompt := ""
if defaultValue != "" {
fullPrompt = fmt.Sprintf("%s(Default: %s)> ", prompt, defaultValue)
} else {
fullPrompt = fmt.Sprintf("%s> ", prompt)
}
rl, err := readline.NewEx(&readline.Config{
Prompt: fullPrompt,
AutoComplete: completer,
})
if err != nil {
panic(err)
}
defer rl.Close()
for {
input, err := rl.Readline()
if err == readline.ErrInterrupt {
panic(err)
}
input = strings.TrimSpace(input)
if err == nil { // or io.EOF
if input == "" {
input = defaultValue
}
r := validate(input)
if r == nil {
return input
} else {
fmt.Printf("%s is not valid: %v\n", input, r)
}
}
}
}