chore(cli): change metavar for some options (#61)

This changes some metavars such that `--help` output is closer to the Sphinx documentation.

Author: jeertmans

manim_slides/commons.py

@@ -13,6 +13,7 @@ def config_path_option(function: Callable) -> Callable:
         "-c",
         "--config",
         "config_path",
+        metavar="FILE",
         default=CONFIG_PATH,
         type=click.Path(dir_okay=False),
         help="Set path to configuration file.",

manim_slides/present.py

@@ -634,6 +634,7 @@ def convert_cv_qt(self, cv_img):
 @click.command()
 @click.option(
     "--folder",
+    metavar="DIRECTORY",
     default=FOLDER_PATH,
     type=click.Path(exists=True, file_okay=False),
     help="Set slides folder.",
@@ -674,6 +675,7 @@ def _list_scenes(folder) -> List[str]:
 @config_path_option
 @click.option(
     "--folder",
+    metavar="DIRECTORY",
     default=FOLDER_PATH,
     type=click.Path(exists=True, file_okay=False),
     help="Set slides folder.",
@@ -690,6 +692,7 @@ def _list_scenes(folder) -> List[str]:
 @click.option(
     "-r",
     "--resolution",
+    metavar="<WIDTH HEIGHT>",
     type=(int, int),
     default=(1920, 1080),
     help="Window resolution WIDTH HEIGHT used if fullscreen is not set. You may manually resize the window afterward.",
@@ -699,6 +702,7 @@ def _list_scenes(folder) -> List[str]:
     "--to",
     "--record-to",
     "record_to",
+    metavar="FILE",
     type=click.Path(dir_okay=False),
     default=None,
     help="If set, the presentation will be recorded into a AVI video file with given name.",