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Signed-off-by: Gabriel Mougard <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,231 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "fmt" | ||
| "log" | ||
| "os" | ||
| "strconv" | ||
| "strings" | ||
|
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| "golang.org/x/term" | ||
| ) | ||
|
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||
| func ValueInSlice[T comparable](key T, list []T) bool { | ||
| for _, entry := range list { | ||
| if entry == key { | ||
| return true | ||
| } | ||
| } | ||
|
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| return false | ||
| } | ||
|
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| // Asker holds a reader for reading input into CLI questions. | ||
| type Asker struct { | ||
| reader *bufio.Reader | ||
| logger *log.Logger | ||
| } | ||
|
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| // NewAsker creates a new Asker instance that reads from the given reader. | ||
| // It can also be configured with a logger to help during the debug process. | ||
| func NewAsker(reader *bufio.Reader, logger *log.Logger) Asker { | ||
| return Asker{reader: reader, logger: logger} | ||
| } | ||
|
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| // AskBool asks a question and expect a yes/no answer. | ||
| func (a *Asker) AskBool(question string, defaultAnswer string) (bool, error) { | ||
| for { | ||
| answer, err := a.askQuestion(question, defaultAnswer) | ||
| if err != nil { | ||
| if a.logger != nil { | ||
| a.logger.Printf("Failed to read answer (%v) for question (%v). err : %v", answer, question, err) | ||
| } | ||
|
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| return false, err | ||
| } | ||
|
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| if ValueInSlice(strings.ToLower(answer), []string{"yes", "y"}) { | ||
| return true, nil | ||
| } else if ValueInSlice(strings.ToLower(answer), []string{"no", "n"}) { | ||
| return false, nil | ||
| } | ||
|
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| a.invalidInput(question, answer) | ||
| } | ||
| } | ||
|
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| // AskChoice asks the user to select one of multiple options. | ||
| func (a *Asker) AskChoice(question string, choices []string, defaultAnswer string) (string, error) { | ||
| for { | ||
| answer, err := a.askQuestion(question, defaultAnswer) | ||
| if err != nil { | ||
| if a.logger != nil { | ||
| a.logger.Printf("Failed to read answer (%v) for question (%v). err : %v", answer, question, err) | ||
| } | ||
|
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| return "", err | ||
| } | ||
|
|
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| if ValueInSlice(answer, choices) { | ||
| return answer, nil | ||
| } else if a.logger != nil { | ||
| a.logger.Printf("Answer (%v) not among available choices (%v))", answer, choices) | ||
| } | ||
|
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| a.invalidInput(question, answer) | ||
| } | ||
| } | ||
|
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| // AskInt asks the user to enter an integer between a min and max value. | ||
| func (a *Asker) AskInt(question string, min int64, max int64, defaultAnswer string, validate func(int64) error) (int64, error) { | ||
| for { | ||
| answer, err := a.askQuestion(question, defaultAnswer) | ||
| if err != nil { | ||
| if a.logger != nil { | ||
| a.logger.Printf("Failed to read answer (%v) for question (%v). err : %v", answer, question, err) | ||
| } | ||
|
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| return -1, err | ||
| } | ||
|
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| result, err := strconv.ParseInt(answer, 10, 64) | ||
| if err != nil { | ||
| if a.logger != nil { | ||
| a.logger.Printf("Invalid answer (%v) for question (%v). err : %v", answer, question, err) | ||
| } | ||
|
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| fmt.Fprintf(os.Stderr, "Invalid input: %v\n\n", err) | ||
| continue | ||
| } | ||
|
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| if !((min == -1 || result >= min) && (max == -1 || result <= max)) { | ||
| if a.logger != nil { | ||
| a.logger.Printf("Answer (%v) out of range for question (%v)", answer, question) | ||
| } | ||
|
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| fmt.Fprintf(os.Stderr, "Invalid input: out of range\n\n") | ||
| continue | ||
| } | ||
|
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| if validate != nil { | ||
| err = validate(result) | ||
| if err != nil { | ||
| if a.logger != nil { | ||
| a.logger.Printf("Invalid answer (%v) for question (%v). err : %v", answer, question, err) | ||
| } | ||
|
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| fmt.Fprintf(os.Stderr, "Invalid input: %v\n\n", err) | ||
| continue | ||
| } | ||
| } | ||
|
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| return result, err | ||
| } | ||
| } | ||
|
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||
| // AskString asks the user to enter a string, which optionally | ||
| // conforms to a validation function. | ||
| func (a *Asker) AskString(question string, defaultAnswer string, validate func(string) error) (string, error) { | ||
| for { | ||
| answer, err := a.askQuestion(question, defaultAnswer) | ||
| if err != nil { | ||
| if a.logger != nil { | ||
| a.logger.Printf("Failed to read answer (%v) for question (%v). err : %v", answer, question, err) | ||
| } | ||
|
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| return "", err | ||
| } | ||
|
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| if validate != nil { | ||
| err = validate(answer) | ||
| if err != nil { | ||
| if a.logger != nil { | ||
| a.logger.Printf("Invalid answer (%v) for question (%v). err : %v", answer, question, err) | ||
| } | ||
|
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| fmt.Fprintf(os.Stderr, "Invalid input: %v\n\n", err) | ||
| continue | ||
| } | ||
|
|
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| return answer, err | ||
| } | ||
|
|
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| if len(answer) != 0 { | ||
| return answer, err | ||
| } | ||
|
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| a.invalidInput(question, answer) | ||
| } | ||
| } | ||
|
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| // AskPassword asks the user to enter a password. | ||
| func (a *Asker) AskPassword(question string) string { | ||
| for { | ||
| fmt.Print(question) | ||
|
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| pwd, _ := term.ReadPassword(0) | ||
| fmt.Println("") | ||
| inFirst := string(pwd) | ||
| inFirst = strings.TrimSuffix(inFirst, "\n") | ||
|
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| fmt.Print("Again: ") | ||
| pwd, _ = term.ReadPassword(0) | ||
| fmt.Println("") | ||
| inSecond := string(pwd) | ||
| inSecond = strings.TrimSuffix(inSecond, "\n") | ||
|
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| // refuse empty password or if password inputs do not match | ||
| if len(inFirst) > 0 && inFirst == inSecond { | ||
| return inFirst | ||
| } | ||
|
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| a.invalidInput(question, "*****") | ||
| } | ||
| } | ||
|
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| // AskPasswordOnce asks the user to enter a password. | ||
| // | ||
| // It's the same as AskPassword, but it won't ask to enter it again. | ||
| func (a *Asker) AskPasswordOnce(question string) string { | ||
| for { | ||
| fmt.Print(question) | ||
| pwd, _ := term.ReadPassword(0) | ||
| fmt.Println("") | ||
|
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| // refuse empty password | ||
| spwd := string(pwd) | ||
| if len(spwd) > 0 { | ||
| return spwd | ||
| } | ||
|
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| a.invalidInput(question, "*****") | ||
| } | ||
| } | ||
|
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| // Ask a question on the output stream and read the answer from the input stream. | ||
| func (a *Asker) askQuestion(question, defaultAnswer string) (string, error) { | ||
| fmt.Print(question) | ||
|
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| return a.readAnswer(defaultAnswer) | ||
| } | ||
|
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| // Read the user's answer from the input stream, trimming newline and providing a default. | ||
| func (a *Asker) readAnswer(defaultAnswer string) (string, error) { | ||
| answer, err := a.reader.ReadString('\n') | ||
| answer = strings.TrimSpace(strings.TrimSuffix(answer, "\n")) | ||
| if answer == "" { | ||
| answer = defaultAnswer | ||
| } | ||
|
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| return answer, err | ||
| } | ||
|
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| // Print an invalid input message on the error stream. | ||
| func (a *Asker) invalidInput(question string, answer string) { | ||
| if a.logger != nil { | ||
| a.logger.Printf("Invalid answer (%v) for question (%v)", answer, question) | ||
| } | ||
|
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| fmt.Fprintf(os.Stderr, "Invalid input, try again.\n\n") | ||
| } |
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