fix: Only run imports for actually used command

Noticeably speeds up app startup (e.g. when just printing the version),
because e.g. `server` module code isn't run unnecessarily.

ancv/__main__.py

@@ -4,24 +4,10 @@
 locally.
 """
 
-import logging
-import os
 from pathlib import Path
 from typing import Optional
 
-import structlog
 import typer
-from pydantic import ValidationError
-from rich import print as rprint
-from rich.tree import Tree
-from structlog.processors import JSONRenderer, TimeStamper, add_log_level
-
-from ancv.exceptions import ResumeConfigError
-from ancv.reflection import METADATA
-from ancv.visualization.templates import Template
-from ancv.visualization.themes import THEMES
-from ancv.visualization.translations import TRANSLATIONS
-from ancv.web.server import APIHandler, FileHandler, ServerContext
 
 app = typer.Typer(no_args_is_help=True, help=__doc__)
 server_app = typer.Typer(no_args_is_help=True, help="Interacts with the web server.")
@@ -39,6 +25,11 @@ def api(
 ) -> None:
     """Starts the web server and serves the API."""
 
+    import os
+
+    from ancv.reflection import METADATA
+    from ancv.web.server import APIHandler, ServerContext
+
     context = ServerContext(host=host, port=port, path=path)
     api = APIHandler(
         # https://docs.github.com/en/rest/overview/resources-in-the-rest-api#user-agent-required :
@@ -69,6 +60,8 @@ def file(
 ) -> None:
     """Starts the web server and serves a single, rendered resume file."""
 
+    from ancv.web.server import FileHandler, ServerContext
+
     context = ServerContext(host=host, port=port, path=path)
     FileHandler(file).run(context)
 
@@ -82,6 +75,8 @@ def render(
 ) -> None:
     """Locally renders the JSON resume at the given file path."""
 
+    from ancv.visualization.templates import Template
+
     template = Template.from_file(path)
     output = template.render()
     print(output)
@@ -97,6 +92,11 @@ def validate(
 ) -> None:
     """Checks the validity of the given JSON resume without rendering."""
 
+    from pydantic import ValidationError
+
+    from ancv.exceptions import ResumeConfigError
+    from ancv.visualization.templates import Template
+
     try:
         Template.from_file(path)
     except (ValidationError, ResumeConfigError) as e:
@@ -110,6 +110,8 @@ def validate(
 def version() -> None:
     """Prints the application version."""
 
+    from ancv.reflection import METADATA
+
     print(f"ancv {METADATA.version}")
 
 
@@ -118,6 +120,12 @@ def list() -> None:
     """Lists all available components (templates, themes and translations)."""
 
     # This is pretty raw, but it works. Could make it prettier using more of `rich`.
+    from rich import print
+    from rich.tree import Tree
+
+    from ancv.visualization.templates import Template
+    from ancv.visualization.themes import THEMES
+    from ancv.visualization.translations import TRANSLATIONS
 
     tree = Tree("Components")
 
@@ -136,7 +144,7 @@ def list() -> None:
         translation_tree.add(translation)
     tree.add(translation_tree)
 
-    rprint(tree)
+    print(tree)
 
 
 @app.callback()
@@ -150,6 +158,12 @@ def main(
     https://typer.tiangolo.com/tutorial/commands/callback/
     """
 
+    import logging
+    import os
+
+    import structlog
+    from structlog.processors import JSONRenderer, TimeStamper, add_log_level
+
     structlog.configure(  # This is global state
         processors=[  # https://www.structlog.org/en/stable/api.html#procs
             TimeStamper(fmt="iso", utc=True, key="ts"),