refactor(prompts): fold Asker into Prompter and share delete confirmations

FormPrompter is the only production prompter and implements the rich
prompt API, so Ask, AskText and ConfirmDefault become the Prompter
interface and the plain Input/Confirm fallbacks go away.

Confirmations that default to no derive their non-terminal wording
from the prompt, and single deletes share deleteConfirmed for the
prompt, the request and the done line.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/helpers_test.go

@@ -5,6 +5,7 @@ package app
 
 import (
 	"bytes"
+	"cmp"
 	"context"
 	"encoding/json"
 	"errors"
@@ -153,17 +154,34 @@ type scriptedPrompter struct {
 	asked         []string
 	secrets       []string
 	confirmations []string
+	texts         []string
+	defaults      []bool
 }
 
-func (p *scriptedPrompter) Input(_ context.Context, field string) (string, error) {
+func (p *scriptedPrompter) Ask(_ context.Context, field string, validate func(string) error) (string, error) {
 	p.asked = append(p.asked, field)
-	if value, ok := p.inputs[field]; ok {
+	value, ok := p.inputs[field]
+	if !ok {
+		if p.input == "" {
+			return "", errors.New("unexpected input prompt " + field)
+		}
+		value = p.input
+	}
+	// A form re-prompts until the answer is valid; the script has no other answer, so it gives up.
+	if validate != nil && validate(value) != nil {
+		return "", terminal.ErrCanceled
+	}
+	return value, nil
+}
+
+// AskText records the title and initial text, and answers like Ask, else with "typed body".
+func (p *scriptedPrompter) AskText(_ context.Context, title, initial string) (string, error) {
+	p.asked = append(p.asked, title)
+	p.texts = append(p.texts, title+" "+initial)
+	if value, ok := p.inputs[title]; ok {
 		return value, nil
 	}
-	if p.input == "" {
-		return "", errors.New("unexpected input prompt " + field)
-	}
-	return p.input, nil
+	return cmp.Or(p.input, "typed body"), nil
 }
 
 func (p *scriptedPrompter) SecretInput(_ context.Context, title string) (string, error) {
@@ -174,8 +192,9 @@ func (p *scriptedPrompter) SecretInput(_ context.Context, title string) (string,
 	return p.secret, nil
 }
 
-func (p *scriptedPrompter) Confirm(_ context.Context, description string) (bool, error) {
+func (p *scriptedPrompter) ConfirmDefault(_ context.Context, description string, defaultYes bool) (bool, error) {
 	p.confirmations = append(p.confirmations, description)
+	p.defaults = append(p.defaults, defaultYes)
 	return p.accept, nil
 }