(feat): allow help input as a valid answer

examples/inputfilesuggestion.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"errors"
 	"fmt"
 	"path/filepath"
 
@@ -21,7 +22,16 @@ var q = []*survey.Question{
 			Suggest: suggestFiles,
 			Help:    "Any file; do not need to exist yet",
 		},
-		Validate: survey.Required,
+		Validate: survey.ComposeValidators(
+			survey.Required,
+			func(file interface{}) error {
+				if file == "?" {
+					return errors.New("? is not a valid file name")
+				}
+
+				return nil
+			},
+		),
 	},
 }
 

input.go

@@ -185,7 +185,7 @@ func (i *Input) Prompt(config *PromptConfig) (interface{}, error) {
 	cursor.Up(1)
 
 	// if we ran into the help string
-	if i.answer == config.HelpInput && i.Help != "" {
+	if i.answer == config.HelpInput && i.Help != "" && !i.showingHelp {
 		// show the help and prompt again
 		i.showingHelp = true
 		return i.Prompt(config)

input_test.go

@@ -184,6 +184,21 @@ func TestInputPrompt(t *testing.T) {
 			},
 			"Satoshi Nakamoto",
 		},
+		{
+			"Test Input prompt interaction and using help input as answer",
+			&Input{
+				Message: "Are you confused?",
+				Help:    "You can use ? as answer when in doubt",
+			},
+			func(c *expect.Console) {
+				c.ExpectString("Are you confused?")
+				c.SendLine("?")
+				c.ExpectString("You can use ? as answer when in doubt")
+				c.SendLine("?")
+				c.ExpectEOF()
+			},
+			"?",
+		},
 		{
 			// https://en.wikipedia.org/wiki/ANSI_escape_code
 			// Device Status Report - Reports the cursor position (CPR) to the