1 files changed, 44 insertions, 0 deletions
diff --git a/input/prompt.go b/input/prompt.go
new file mode 100644
index 00000000..6036c062
--- /dev/null
+++ b/input/prompt.go
@@ -0,0 +1,44 @@
+package input
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func PromptValue(name string, preValue string) (string, error) {
+	return promptValue(name, preValue, false)
+}
+
+func PromptValueRequired(name string, preValue string) (string, error) {
+	return promptValue(name, preValue, true)
+}
+
+func promptValue(name string, preValue string, required bool) (string, error) {
+	for {
+		if preValue != "" {
+			_, _ = fmt.Fprintf(os.Stderr, "%s [%s]: ", name, preValue)
+		} else {
+			_, _ = fmt.Fprintf(os.Stderr, "%s: ", name)
+		}
+
+		line, err := bufio.NewReader(os.Stdin).ReadString('\n')
+		if err != nil {
+			return "", err
+		}
+
+		line = strings.TrimSpace(line)
+
+		if preValue != "" && line == "" {
+			return preValue, nil
+		}
+
+		if required && line == "" {
+			_, _ = fmt.Fprintf(os.Stderr, "%s is empty\n", name)
+			continue
+		}
+
+		return line, nil
+	}
+}