Check description in Phalanx CLI

Check that the description starts with a capital letter and is not
excessively long inside the Phalanx CLI so that it won't create new
applications that immediately fail the application docs test.

src/phalanx/cli.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 import json
+import re
 import sys
 from pathlib import Path
 
@@ -121,7 +122,10 @@ def application() -> None:
     "-d",
     "--description",
     prompt="Short description",
-    help="Short description of the new application.",
+    help=(
+        "Short description of the new application. Must start with capital"
+        " letter and, with the application name, be less than 80 characters."
+    ),
 )
 @click.option(
     "-s",
@@ -142,6 +146,10 @@ def application_create(
     """
     if not config:
         config = _find_config()
+    if len(name) + 3 + len(description) > 80:
+        raise click.UsageError("Name plus description is too long")
+    if not re.match("[A-Z0-9]", description):
+        raise click.UsageError("Description must start with capital letter")
     factory = Factory(config)
     application_service = factory.create_application_service()
     application_service.create_application(

tests/cli/application_test.py

@@ -117,6 +117,35 @@ def test_create(tmp_path: Path) -> None:
     assert environment.applications["hips"].chart["sources"][0] == expected
 
 
+def test_create_errors(tmp_path: Path) -> None:
+    config_path = tmp_path / "phalanx"
+    shutil.copytree(str(phalanx_test_path()), str(config_path))
+    result = run_cli(
+        "application",
+        "create",
+        "some-really-long-app-name-please-do-not-do-this",
+        "--description",
+        "Some really long description on top of the app name",
+        "--config",
+        str(config_path),
+        needs_config=False,
+    )
+    assert "Name plus description is too long" in result.output
+    assert result.exit_code == 2
+    result = run_cli(
+        "application",
+        "create",
+        "app",
+        "--description",
+        "lowercase description",
+        "--config",
+        str(config_path),
+        needs_config=False,
+    )
+    assert "Description must start with capital letter" in result.output
+    assert result.exit_code == 2
+
+
 def test_create_prompt(tmp_path: Path) -> None:
     config_path = tmp_path / "phalanx"
     shutil.copytree(str(phalanx_test_path()), str(config_path))