feat(01-03): add deterministic rich CLI output

- Inject bonfire.Output from stdin/stdout/stderr with stdlib widgets and x/term
- Degrade spinner, progress, table and prompts without a TTY or color
- Reject plugin command names that are not namespace:verb

bonfire/prompts_test.go

@@ -0,0 +1,92 @@
+package bonfire
+
+import (
+	"bytes"
+	"io"
+	"strings"
+	"testing"
+)
+
+func TestConfirmUsesDefaultWhenNonTTY(t *testing.T) {
+	var buf bytes.Buffer
+	out := NewOutput(strings.NewReader("n\n"), &buf, &buf)
+	got, err := out.Confirm("continue?", true)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !got {
+		t.Fatal("non-tty confirm should use default true without reading stdin")
+	}
+	if buf.Len() != 0 {
+		t.Fatalf("confirm wrote %q", buf.String())
+	}
+}
+
+func TestAskReadsStdinLine(t *testing.T) {
+	var buf bytes.Buffer
+	out := NewOutput(strings.NewReader("alice\n"), &buf, &buf)
+	got, err := out.Ask("name", "bob")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got != "alice" {
+		t.Fatalf("ask = %q", got)
+	}
+}
+
+func TestAskEOFUsesDefault(t *testing.T) {
+	var buf bytes.Buffer
+	out := NewOutput(strings.NewReader(""), &buf, &buf)
+	got, err := out.Ask("name", "bob")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got != "bob" {
+		t.Fatalf("ask eof = %q", got)
+	}
+}
+
+func TestChoiceReadsStdinLine(t *testing.T) {
+	var buf bytes.Buffer
+	out := NewOutput(strings.NewReader("2\n"), &buf, &buf)
+	got, err := out.Choice("pick", []string{"a", "b", "c"}, 0)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got != "b" {
+		t.Fatalf("choice = %q", got)
+	}
+}
+
+func TestSecretReadsPlainStdinLine(t *testing.T) {
+	var buf bytes.Buffer
+	out := NewOutput(strings.NewReader("s3cret\n"), &buf, &buf)
+	got, err := out.Secret("token")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got != "s3cret" {
+		t.Fatalf("secret = %q", got)
+	}
+	if strings.Contains(buf.String(), "s3cret") {
+		t.Fatal("secret value was written to output")
+	}
+}
+
+func TestClosedStdinDoesNotHang(t *testing.T) {
+	var buf bytes.Buffer
+	out := NewOutput(io.NopCloser(strings.NewReader("")), &buf, &buf)
+	if _, err := out.Ask("name", "def"); err != nil {
+		t.Fatal(err)
+	}
+	ok, err := out.Confirm("ok?", false)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if ok {
+		t.Fatal("confirm default false")
+	}
+	if _, err := out.Secret("pw"); err != nil {
+		t.Fatal(err)
+	}
+}