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49 lines
931 B

package prompt
import (
"bufio"
"fmt"
"os"
"strings"
)
type Prompter interface {
Prompt(string)
}
func Read[T any]() (out T, err error) {
nilv := out
b := bufio.NewReader(os.Stdin)
s, err := b.ReadString('\n')
if err != nil {
return nilv, err
}
switch o := any(&out).(type) {
case *string:
*o = s[:len(s)-1]
case *Prompter:
(*o).Prompt(s)
// If a number, remove all spaces before scanning
case *int, *int8, *int16, *int32, *int64, *uint, *uint8, *uint16, *uint32, *uint64, *float32, *float64, *complex64, *complex128:
s = strings.Replace(s, " ", "", -1)
_, err = fmt.Sscan(s, o)
if err != nil {
return nilv, err
}
default:
// Scan any other type, return error if it fails
_, err = fmt.Sscan(s, o)
if err != nil {
return nilv, err
}
}
return out, nil
}
func MustRead[T any]() T {
out, err := Read[T]()
if err != nil {
panic("Error during read: " + err.Error())
}
return out
}