fix: hide positional arguments with no help

Keep the parsing so they show in the command syntax.

Signed-off-by: Sergio Schvezov <sergio.schvezov@canonical.com>

craft_cli/helptexts.py

@@ -68,9 +68,11 @@ def _build_item_plain(title: str, text: str, title_space: int) -> list[str]:
     text_space = TERMINAL_WIDTH - title_space - not_title_space
     wrapped_lines = textwrap.wrap(text, text_space)
 
+    result: list[str] = []
     # first line goes with the title at column 4
-    first = f"    {title:>{title_space}s}:  {wrapped_lines[0]}"
-    result = [first]
+    if wrapped_lines:
+        first = f"    {title:>{title_space}s}:  {wrapped_lines[0]}"
+        result.append(first)
 
     # the rest (if any) still aligned but without title
     for line in wrapped_lines[1:]:
@@ -339,7 +341,9 @@ def _build_plain_command_help(
             positional_args_lines = ["Positional arguments:"]
             for title, text in parameters:
                 positional_args_lines.extend(_build_item_plain(title, text, max_title_len))
-            textblocks.append("\n".join(positional_args_lines))
+            # Only populate if we have collected parameters.
+            if len(positional_args_lines) > 1:
+                textblocks.append("\n".join(positional_args_lines))
 
         # command options
         option_lines = ["Options:"]
@@ -401,10 +405,14 @@ def _build_markdown_command_help(
                 "| | |",
                 "|-|-|",
             ]
-            for title, text in parameters:
+            # Only keep items that have text
+            for title, text in ((title, text) for title, text in parameters if text):
                 parameters_lines.append(f"| `{title}` | {text} |")
 
-            textblocks.append("\n".join(parameters_lines))
+            # Only populate if we have collected parameters
+            # The header is 3 lines
+            if len(parameters_lines) > 3:
+                textblocks.append("\n".join(parameters_lines))
 
         option_lines = [
             "## Options:",

tests/unit/test_help.py

@@ -591,6 +591,82 @@ def test_command_help_text_with_parameters(docs_url, output_format):
     assert text == (expected_plain if output_format == OutputFormat.plain else expected_markdown)
 
 
+@pytest.mark.parametrize("output_format", list(OutputFormat))
+def test_command_help_text_with_parameters_with_no_help(docs_url, output_format):
+    """Test help text for a command with parameters but no help."""
+    overview = textwrap.dedent(
+        """
+        Quite some long text.
+    """
+    )
+    cmd1 = create_command("somecommand", "Command one line help.", overview=overview)
+    cmd2 = create_command("other-cmd-2", "Some help.")
+    command_groups = [
+        CommandGroup("group1", [cmd1, cmd2]),
+    ]
+
+    options = [
+        ("-h, --help", "Show this help message and exit."),
+        ("name", ""),
+        ("--revision", "The revision to release (defaults to latest)."),
+        ("extraparam", ""),
+        ("--other-option", "Other option."),
+        ("--experimental-1", HIDDEN),
+        ("--experimental-2", argparse.SUPPRESS),
+    ]
+
+    help_builder = HelpBuilder("testapp", "general summary", command_groups, docs_url)
+    text = help_builder.get_command_help(cmd1(None), options, output_format)
+
+    expected_plain = textwrap.dedent(
+        """\
+        Usage:
+            testapp somecommand [options] <name> <extraparam>
+
+        Summary:
+            Quite some long text.
+
+        Options:
+                -h, --help:  Show this help message and exit.
+                --revision:  The revision to release (defaults to latest).
+            --other-option:  Other option.
+
+        See also:
+            other-cmd-2
+
+        For a summary of all commands, run 'testapp help --all'.
+    """
+    )
+    if docs_url:
+        expected_plain += (
+            "For more information, check out: "
+            "www.craft-app.com/docs/3.14159/reference/commands/somecommand\n"
+        )
+    expected_markdown = textwrap.dedent(
+        """\
+        ## Usage:
+        ```text
+        testapp somecommand [options] <name> <extraparam>
+        ```
+
+        ## Summary:
+
+        Quite some long text.
+
+        ## Options:
+        | | |
+        |-|-|
+        | `-h, --help` | Show this help message and exit. |
+        | `--revision` | The revision to release (defaults to latest). |
+        | `--other-option` | Other option. |
+
+        ## See also:
+        - `other-cmd-2`
+    """
+    )
+    assert text == (expected_plain if output_format == OutputFormat.plain else expected_markdown)
+
+
 @pytest.mark.parametrize("output_format", list(OutputFormat))
 def test_command_help_text_complex_overview(docs_url, output_format):
     """The overviews are processed in different ways."""