proper color scheme preview to avoid watcher creation spam

cli/src/zshell/subcommands/scheme.py

@@ -116,10 +116,15 @@ def list_presets(
 @app.command()
 def generate(
 	image_path: Path | None = typer.Option(
-		None, help="Path to source image. Required for image mode."
+		None,
+		"--image-path",
+		"-i",
+		help="Path to source image. Required for image mode.",
 	),
 	scheme: str | None = typer.Option(
 		None,
+		"--scheme",
+		"-s",
 		help="Color scheme algorithm to use for image mode. Ignored in preset mode.",
 		autocompletion=_complete_scheme_name,
 	),
@@ -130,16 +135,26 @@ def generate(
 	),
 	mode: str | None = typer.Option(
 		None,
+		"--mode",
+		"-m",
 		help="Mode of the preset scheme (dark or light).",
 		autocompletion=_complete_mode,
 	),
 	accent: str | None = typer.Option(
 		None,
+		"--accent",
+		"-a",
 		help="Accent for schemes that support it (e.g. mauve).",
 		autocompletion=_complete_accent,
 	),
+	preview: bool = typer.Option(
+		False,
+		"--preview",
+		"-p",
+		help="Preview scheme - internal use",
+	),
 ):
-	if not any([image_path, scheme, preset, mode, accent]):
+	if not any([image_path, scheme, preset, mode, accent, preview]):
 		print(
 			"Hint: use --preset <scheme>:<variant> or --image-path <path>",
 			file=sys.stderr,
@@ -685,10 +700,6 @@ def generate(
 
 		variant_val = scheme if not preset else p_variant
 
-		if smart and not preset:
-			apply_gtk_mode(effective_mode)
-			apply_qt_mode(effective_mode, HOME)
-
 		output_dict = {
 			"name": name,
 			"flavor": flavor,
@@ -698,6 +709,14 @@ def generate(
 			"seed": seed.to_int(),
 		}
 
+		if preview:
+			print(json.dumps(output_dict))
+			return
+
+		if smart and not preset:
+			apply_gtk_mode(effective_mode)
+			apply_qt_mode(effective_mode, HOME)
+
 		if TEMPLATE_DIR is not None:
 			wp = str(WALL_PATH)
 			ctx = build_template_context(