Update path docs

docs/src/parameter_types/path/tutorial001.py

@@ -3,7 +3,10 @@
 import typer
 
 
-def main(config: Path = typer.Option(...)):
+def main(config: Path = typer.Option(None)):
+    if config is None:
+        typer.echo("No config file")
+        raise typer.Abort()
     if config.is_file():
         text = config.read_text()
         typer.echo(f"Config file contents: {text}")

docs/tutorial/parameter-types/path.md

@@ -13,6 +13,13 @@ Check it:
 <div class="termy">
 
 ```console
+// No config
+$ python main.py
+
+No config file
+Aborted!
+
+// Pass a config that doesn't exist
 $ python main.py --config config.txt
 
 The config doesn't exist
@@ -42,7 +49,10 @@ You can perform several validations for `Path` *CLI parameters*:
 * `dir_okay`: controls if a directory is a possible value.
 * `writable`: if true, a writable check is performed.
 * `readable`: if true, a readable check is performed.
-* `resolve_path`: if this is true, then the path is fully resolved before the value is passed onwards. This means that it’s absolute and symlinks are resolved. It will not expand a tilde-prefix, as this is supposed to be done by the shell only.
+* `resolve_path`: if this is true, then the path is fully resolved before the value is passed onwards. This means that it’s absolute and <abbr title="symbolic links, also known as shortcuts. Links in a file system that point to other location. For example, some applications when installed create symlinks in the desktop to launch them.">symlinks</abbr> are resolved.
+
+!!! note "Technical Details"
+    It will not expand a tilde-prefix (something with `~`, like `~/Documents/`), as this is supposed to be done by the shell only.
 
 !!! tip
     All these parameters come directly from <a href="https://click.palletsprojects.com/en/7.x/parameters/#parameter-types" target="_blank">Click</a>.

tests/test_tutorial/test_parameter_types/test_path/test_tutorial001.py

@@ -14,6 +14,13 @@
 config_file = Path("./config.txt")
 
 
+def test_no_path():
+    result = runner.invoke(app)
+    assert result.exit_code == 1
+    assert "No config file" in result.output
+    assert "Aborted!" in result.output
+
+
 def test_not_exists():
     if config_file.exists():  # pragma no cover
         config_file.unlink()