feat(cli): add prompt system for interactive init

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: acmore

internal/cli/prompt.go

@@ -0,0 +1,92 @@
+package cli
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+
+	"github.com/acmore/okdev/internal/config"
+)
+
+// InitOverrides holds flag-provided values that skip prompting.
+type InitOverrides struct {
+	Name      string
+	Namespace string
+}
+
+// applyOverrides applies non-empty flag values to template vars.
+func applyOverrides(vars *config.TemplateVars, o InitOverrides) {
+	if o.Name != "" {
+		vars.Name = o.Name
+	}
+	if o.Namespace != "" {
+		vars.Namespace = o.Namespace
+	}
+}
+
+// detectDefaultName returns a sensible default for the environment name
+// based on the current directory (git repo basename).
+func detectDefaultName() string {
+	wd, err := os.Getwd()
+	if err != nil {
+		return "my-project"
+	}
+	return filepath.Base(wd)
+}
+
+// promptInteractive runs interactive prompts to fill in template vars.
+// Only prompts for values not already set by flags.
+// When nonInteractive is true, uses defaults without prompting.
+func promptInteractive(vars *config.TemplateVars, nonInteractive bool) error {
+	if vars.Name == "" {
+		vars.Name = detectDefaultName()
+	}
+	if nonInteractive {
+		return nil
+	}
+
+	// Interactive prompts using basic fmt.Scanln.
+	// Each prompt shows the current default and allows the user to accept or override.
+	var input string
+
+	input = promptString("Environment name", vars.Name)
+	if input != "" {
+		vars.Name = input
+	}
+
+	input = promptString("Namespace", vars.Namespace)
+	if input != "" {
+		vars.Namespace = input
+	}
+
+	input = promptString("Sidecar image", vars.SidecarImage)
+	if input != "" {
+		vars.SidecarImage = input
+	}
+
+	input = promptString("Sync local path", vars.SyncLocal)
+	if input != "" {
+		vars.SyncLocal = input
+	}
+
+	input = promptString("Sync remote path", vars.SyncRemote)
+	if input != "" {
+		vars.SyncRemote = input
+	}
+
+	input = promptString("SSH user", vars.SSHUser)
+	if input != "" {
+		vars.SSHUser = input
+	}
+
+	return nil
+}
+
+// promptString prints a prompt with a default and reads user input.
+// Returns empty string if user accepts default (just presses Enter).
+func promptString(label, defaultVal string) string {
+	fmt.Printf("? %s: (%s) ", label, defaultVal)
+	var input string
+	fmt.Scanln(&input)
+	return input
+}

internal/cli/prompt_test.go

@@ -0,0 +1,34 @@
+package cli
+
+import (
+	"testing"
+
+	"github.com/acmore/okdev/internal/config"
+)
+
+func TestApplyFlagOverrides(t *testing.T) {
+	vars := config.NewTemplateVars()
+	overrides := InitOverrides{
+		Name:      "my-env",
+		Namespace: "staging",
+	}
+	applyOverrides(vars, overrides)
+
+	if vars.Name != "my-env" {
+		t.Fatalf("expected name my-env, got %q", vars.Name)
+	}
+	if vars.Namespace != "staging" {
+		t.Fatalf("expected namespace staging, got %q", vars.Namespace)
+	}
+}
+
+func TestApplyFlagOverridesEmptyNoChange(t *testing.T) {
+	vars := config.NewTemplateVars()
+	vars.Name = "original"
+	overrides := InitOverrides{}
+	applyOverrides(vars, overrides)
+
+	if vars.Name != "original" {
+		t.Fatalf("expected name to remain original, got %q", vars.Name)
+	}
+}