feat(cli): add basic logging facilities (#50)

* feat(cli): add basic logging facilities

This PR adds basic logging support, to be extended in the future.

* fix: typo in decorator name

manim_slides/commons.py

@@ -1,11 +1,13 @@
 from typing import Callable
 
 import click
+from click import Context, Parameter
 
 from .defaults import CONFIG_PATH
+from .manim import logger
 
 
-def config_path_option(function) -> Callable:
+def config_path_option(function: Callable) -> Callable:
     """Wraps a function to add configuration path option."""
     return click.option(
         "-c",
@@ -18,7 +20,7 @@ def config_path_option(function) -> Callable:
     )(function)
 
 
-def config_options(function) -> Callable:
+def config_options(function: Callable) -> Callable:
     """Wraps a function to add configuration options."""
     function = config_path_option(function)
     function = click.option(
@@ -31,3 +33,27 @@ def config_options(function) -> Callable:
         help="Merge any existing configuration file with the new configuration.",
     )(function)
     return function
+
+
+def verbosity_option(function: Callable) -> Callable:
+    """Wraps a function to add verbosity option."""
+
+    def callback(ctx: Context, param: Parameter, value: bool) -> None:
+
+        if not value or ctx.resilient_parsing:
+            return
+
+        logger.setLevel(value)
+
+    return click.option(
+        "-v",
+        "--verbosity",
+        type=click.Choice(
+            ["DEBUG", "INFO", "WARNING", "ERROR", "CRITICAL"],
+            case_sensitive=False,
+        ),
+        help="Verbosity of CLI output",
+        default=None,
+        expose_value=False,
+        callback=callback,
+    )(function)

manim_slides/config.py

@@ -5,6 +5,7 @@ from typing import List, Optional, Set
 from pydantic import BaseModel, root_validator, validator
 
 from .defaults import LEFT_ARROW_KEY_CODE, RIGHT_ARROW_KEY_CODE
+from .manim import logger
 
 
 class Key(BaseModel):
@@ -20,7 +21,12 @@ class Key(BaseModel):
         return v
 
     def match(self, key_id: int):
-        return key_id in self.ids
+        m = key_id in self.ids
+
+        if m:
+            logger.debug(f"Pressed key: {self.name}")
+
+        return m
 
 
 class Config(BaseModel):

manim_slides/present.py

@@ -11,9 +11,10 @@ import numpy as np
 from pydantic import ValidationError
 from tqdm import tqdm
 
-from .commons import config_path_option
+from .commons import config_path_option, verbosity_option
 from .config import Config, PresentationConfig, SlideConfig, SlideType
 from .defaults import FOLDER_PATH, FONT_ARGS
+from .manim import logger
 
 INTERPOLATION_FLAGS = {
     "nearest": cv2.INTER_NEAREST,
@@ -450,6 +451,9 @@ class Display:
         cv2.destroyAllWindows()
 
         if self.record_to is not None and len(self.recordings) > 0:
+            logger.debug(
+                f"A total of {len(self.recordings)} frames will be saved to {self.record_to}"
+            )
             file, frame_number, fps = self.recordings[0]
 
             cap = cv2.VideoCapture(file)
@@ -489,6 +493,7 @@ class Display:
     show_default=True,
 )
 @click.help_option("-h", "--help")
+@verbosity_option
 def list_scenes(folder) -> None:
     """List available scenes."""
 
@@ -502,13 +507,18 @@ def _list_scenes(folder) -> List[str]:
 
     for file in os.listdir(folder):
         if file.endswith(".json"):
+            filepath = os.path.join(folder, file)
             try:
-                filepath = os.path.join(folder, file)
                 _ = PresentationConfig.parse_file(filepath)
                 scenes.append(os.path.basename(file)[:-5])
-            except Exception:  # Could not parse this file as a proper presentation config
+            except Exception as e:  # Could not parse this file as a proper presentation config
+                logger.warn(
+                    f"Something went wrong with parsing presentation config `{filepath}`: {e}"
+                )
                 pass
 
+    logger.info(f"Found {len(scenes)} valid scene configuration files in `{folder}`.")
+
     return scenes
 
 
@@ -552,6 +562,7 @@ def _list_scenes(folder) -> List[str]:
     help="If set, the presentation will be recorded into a AVI video file with given name.",
 )
 @click.help_option("-h", "--help")
+@verbosity_option
 def present(
     scenes,
     config_path,
@@ -616,8 +627,8 @@ def present(
                 f"File {config_file} does not exist, check the scene name and make sure to use Slide as your scene base class"
             )
         try:
-            config = PresentationConfig.parse_file(config_file)
-            presentations.append(Presentation(config))
+            pres_config = PresentationConfig.parse_file(config_file)
+            presentations.append(Presentation(pres_config))
         except ValidationError as e:
             raise click.UsageError(str(e))
 
@@ -627,6 +638,7 @@ def present(
         except ValidationError as e:
             raise click.UsageError(str(e))
     else:
+        logger.info("No configuration file found, using default configuration.")
         config = Config()
 
     if record_to is not None:

manim_slides/wizard.py

@@ -5,7 +5,7 @@ import click
 import cv2
 import numpy as np
 
-from .commons import config_options
+from .commons import config_options, verbosity_option
 from .config import Config
 from .defaults import CONFIG_PATH, FONT_ARGS
 
@@ -39,6 +39,7 @@ def prompt(question: str) -> int:
 @click.command()
 @config_options
 @click.help_option("-h", "--help")
+@verbosity_option
 def wizard(config_path, force, merge):
     """Launch configuration wizard."""
     return _init(config_path, force, merge, skip_interactive=False)
@@ -47,6 +48,7 @@ def wizard(config_path, force, merge):
 @click.command()
 @config_options
 @click.help_option("-h", "--help")
+@verbosity_option
 def init(config_path, force, merge, skip_interactive=False):
     """Initialize a new default configuration file."""
     return _init(config_path, force, merge, skip_interactive=True)