[feat]. Add @codex -h help summary command

src/gitea_codex_bot/services/commands.py

@@ -5,12 +5,14 @@ from collections.abc import Iterable
 
 from gitea_codex_bot.types import ParsedCommand
 
-COMMAND_RE = re.compile(r"^@([^\s]+)\s+(review|explain|fix|ignore|rerun)\b(.*)$", re.IGNORECASE | re.DOTALL)
+PREFIX_RE = re.compile(r"^@([^\s]+)\s+(.+)$", re.IGNORECASE | re.DOTALL)
+HELP_ALIASES = {"-h", "--help", "help"}
+SUPPORTED_COMMANDS = {"review", "explain", "fix", "ignore", "rerun"}
 
 
 def parse_command(body: str, aliases: Iterable[str] | None = None) -> ParsedCommand | None:
     stripped = body.strip()
-    match = COMMAND_RE.match(stripped)
+    match = PREFIX_RE.match(stripped)
     if not match:
         return None
     command_alias = match.group(1).lstrip("@").lower()
@@ -18,8 +20,17 @@ def parse_command(body: str, aliases: Iterable[str] | None = None) -> ParsedComm
     if command_alias not in allowed_aliases:
         return None
 
-    name = match.group(2).lower()
-    rest = match.group(3).strip()
+    remainder = match.group(2).strip()
+    if not remainder:
+        return None
+    parts = remainder.split(maxsplit=1)
+    raw_name = parts[0].lower()
+    rest = parts[1].strip() if len(parts) > 1 else ""
+    if raw_name in HELP_ALIASES:
+        return ParsedCommand(name="help", raw=stripped, arguments=[token for token in rest.split() if token])
+    if raw_name not in SUPPORTED_COMMANDS:
+        return None
+    name = raw_name
     tokens = [token for token in rest.split() if token]
 
     parsed = ParsedCommand(name=name, raw=stripped, arguments=tokens)