Add --show-all flag to cymbol to list all custom structure names (#3157)

* Add --show-all flag to cymbol to list all custom structure names

* Fix: Apply ruff formatting to cymbol.py

* Fix: Regenerate cymbol docs for --show-all flag

---------

Co-authored-by: parrot <parrot@localhost.localdomain>

docs/commands/misc/cymbol.md

@@ -4,7 +4,7 @@
 
 ```text
 usage: cymbol [-h] [-a name] [-f filepath] [-r name] [-e name] [-l name]
-              [-s name]
+              [-s name] [--show-all]
 
 ```
 
@@ -20,6 +20,7 @@ Add, show, load, edit, or delete custom structures in plain C.
 |-e|--edit|Edit an existing custom structure|
 |-l|--load|Load an existing custom structure|
 |-s|--show|Show the source code of an existing custom structure|
+||--show-all|Show names of all available custom structures|
 
 <!-- END OF AUTOGENERATED PART. Do not modify this line or the line below, they mark the end of the auto-generated part of the file. If you want to extend the documentation in a way which cannot easily be done by adding to the command help description, write below the following line. -->
 <!-- ------------\>8---- ----\>8---- ----\>8------------ -->

pwndbg/commands/cymbol.py

@@ -301,10 +301,17 @@ parser.add_argument(
     default=None,
     type=str,
 )
+parser.add_argument(
+    "--show-all",
+    help="Show names of all available custom structures",
+    action="store_true",
+)
 
 
 @pwndbg.commands.Command(parser, category=CommandCategory.MISC)
-def cymbol(add: str, file: str, remove: str, edit: str, load: str, show: str) -> None:
+def cymbol(
+    add: str, file: str, remove: str, edit: str, load: str, show: str, show_all: bool
+) -> None:
     if add:
         add_custom_structure(add)
     elif file:
@@ -317,5 +324,11 @@ def cymbol(add: str, file: str, remove: str, edit: str, load: str, show: str) ->
         load_custom_structure(load)
     elif show:
         show_custom_structure(show)
+    elif show_all:
+        print(message.notice("Available custom structure names:\n"))
+        for file in os.listdir(pwndbg_cachedir):
+            if file.endswith(".c"):
+                name = os.path.splitext(file)[0]
+                print(f"  - {name}")
     else:
         parser.print_help()