fix: indent docstring body in help paste output

Command name stays flush-left, docstring lines indented 4 spaces.
Plugin descriptions in the full reference also indented under headers.
Adds test_help_paste_body_indented to verify formatting.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

plugins/core.py

@@ -9,14 +9,18 @@ from derp.plugin import command
 
 
 def _build_cmd_detail(handler, prefix: str) -> str:
-    """Extract and format a command's docstring into a detail block."""
+    """Extract and format a command's docstring into a detail block.
+
+    Command name anchors the left edge; docstring body is indented 4 spaces.
+    """
     doc = textwrap.dedent(handler.callback.__doc__ or "").strip()
     if not doc:
         return ""
     header = f"{prefix}{handler.name}"
     if handler.help:
         header += f" -- {handler.help}"
-    return f"{header}\n{doc}"
+    indented = textwrap.indent(doc, "    ")
+    return f"{header}\n{indented}"
 
 
 async def _paste(bot, text: str) -> str | None:
@@ -108,7 +112,7 @@ async def cmd_help(bot, message):
         desc = (getattr(mod, "__doc__", "") or "").split("\n")[0].strip() if mod else ""
         header = f"[{plugin_name}]"
         if desc:
-            header += f"  {desc}"
+            header += f"\n    {desc}"
         cmd_lines = []
         for cmd_name in plugins[plugin_name]:
             h = bot.registry.commands[cmd_name]
@@ -120,7 +124,7 @@ async def cmd_help(bot, message):
                 if h.help:
                     line += f" -- {h.help}"
                 cmd_lines.append(line)
-        blocks.append(header + "\n" + "\n\n".join(cmd_lines))
+        blocks.append(header + "\n\n" + "\n\n".join(cmd_lines))
     if blocks:
         url = await _paste(bot, "\n\n".join(blocks))
         if url:

tests/test_core.py

@@ -130,10 +130,19 @@ def _cmd_no_doc():
     pass
 
 
-def _make_fp_module(url="https://paste.example.com/abc/raw"):
+def _make_fp_module(url="https://paste.example.com/abc/raw", capture=None):
-    """Create a fake flaskpaste module that returns a fixed URL."""
+    """Create a fake flaskpaste module that returns a fixed URL.
+
+    If capture is a list, appended paste content is stored there.
+    """
     mod = types.ModuleType("flaskpaste")
-    mod.create_paste = lambda bot, text: url
+
+    def _create(bot, text):
+        if capture is not None:
+            capture.append(text)
+        return url
+
+    mod.create_paste = _create
     return mod
 
 
@@ -227,3 +236,23 @@ class TestHelpCommand:
         assert len(bot.replied) == 1
         assert "!widget -- Manage widgets" in bot.replied[0]
         assert "https://" not in bot.replied[0]
+
+    def test_help_paste_body_indented(self):
+        """Paste body has command name flush-left, docstring indented."""
+        bot = _FakeBot()
+        pastes: list[str] = []
+        bot.registry._modules["flaskpaste"] = _make_fp_module(capture=pastes)
+        bot.registry.commands["widget"] = _FakeHandler(
+            name="widget", callback=_cmd_with_doc,
+            help="Manage widgets", plugin="widgets",
+        )
+        msg = _Msg(text="!help widget")
+        asyncio.run(_mod.cmd_help(bot, msg))
+        assert len(pastes) == 1
+        lines = pastes[0].split("\n")
+        # First line: command header, no indent
+        assert lines[0] == "!widget -- Manage widgets"
+        # Docstring lines are indented 4 spaces
+        for line in lines[1:]:
+            if line.strip():
+                assert line.startswith("    "), f"not indented: {line!r}"