chore(lib): re-organizing the module

This PR refactors a lot of the code in order to have a better organized codebase. If will that I needed to create a second level of submodules, to better distinguish the different parts of this project.

manim_slides/cli/wizard/commands.py

@@ -0,0 +1,84 @@
+import sys
+from pathlib import Path
+
+import click
+
+from ...core.config import Config
+from ...core.logger import logger
+from ..commons import config_options, verbosity_option
+
+
+@click.command()
+@config_options
+@click.help_option("-h", "--help")
+@verbosity_option
+def wizard(config_path: Path, force: bool, merge: bool) -> None:
+    """Launch configuration wizard."""
+    return _init(config_path, force, merge, skip_interactive=False)
+
+
+@click.command()
+@config_options
+@click.help_option("-h", "--help")
+@verbosity_option
+def init(
+    config_path: Path, force: bool, merge: bool, skip_interactive: bool = False
+) -> None:
+    """Initialize a new default configuration file."""
+    return _init(config_path, force, merge, skip_interactive=True)
+
+
+def _init(
+    config_path: Path, force: bool, merge: bool, skip_interactive: bool = False
+) -> None:
+    """
+    Actual initialization code for configuration file, with optional interactive
+    mode.
+    """
+    if config_path.exists():
+        logger.debug(f"The `{config_path}` configuration file exists")
+
+        if not force and not merge:
+            choice = click.prompt(
+                "Do you want to continue and (o)verwrite / (m)erge it, or (q)uit?",
+                type=click.Choice(["o", "m", "q"], case_sensitive=False),
+            )
+
+            force = choice == "o"
+            merge = choice == "m"
+
+        if not force and not merge:
+            logger.debug("Exiting without doing anything")
+            sys.exit(0)
+
+    config = Config()
+
+    if force:
+        logger.debug(f"Overwriting `{config_path}` if exists")
+    elif merge:
+        logger.debug(f"Merging new config into `{config_path}`")
+
+    if not skip_interactive:
+        if config_path.exists():
+            config = Config.from_file(config_path)
+
+        from ..qt_utils import qapp
+        from .wizard import Wizard
+
+        app = qapp()
+        app.setApplicationName("Manim Slides Wizard")
+        window = Wizard(config)
+        window.show()
+        app.exec()
+
+        if window.closed_without_saving:
+            sys.exit(0)
+
+        config = window.config
+
+    if merge:
+        config = Config.from_file(config_path).merge_with(config)
+
+    config.to_file(config_path)
+
+    logger.debug(f"Configuration file successfully saved to `{config_path}`")