Adds CI to remove duplicate definitions (#25218)

* the purge

* yes

* incorrect comment

* send it

.github/workflows/ci.yml

@@ -50,6 +50,7 @@ jobs:
           python tools/ci/define_sanity.py
           python tools/ci/restrict_file_types.py
           python tools/ci/verify_sql_version.py
+          python tools/ci/no_duplicate_definitions.py
           python -m tools.ci.check_icon_conflicts
           python -m tools.ci.check_icon_dupenames
           python -m tools.maplint.source --github

code/game/area/areas/ruins/lavaland_areas.dm

@@ -18,7 +18,7 @@
 	icon_state = "yellow"
 
 /area/ruin/powered/golem_ship
-	name = "Free Golem Landing"
+	name = "Free Golem Ship"
 	icon_state = "yellow"
 
 /area/ruin/powered/greed

code/modules/client/preference/preferences_toggles.dm

@@ -301,7 +301,7 @@
 	disable_message = "You will no longer see runechat."
 	blackbox_message = "Toggle Runechat"
 
-/datum/preference_toggle/toggle_runechat
+/datum/preference_toggle/toggle_ghost_death_notifs
 	name = "Toggle Ghost Death Notifications"
 	description = "Toggle a notification when a player dies"
 	preftoggle_bitflag = PREFTOGGLE_2_DEATHMESSAGE

tools/ci/no_duplicate_definitions.py

@@ -0,0 +1,59 @@
+import glob
+import os
+import re
+import sys
+import time
+from collections import namedtuple, defaultdict
+
+Failure = namedtuple("Failure", ["filename", "lineno", "message"])
+Location = namedtuple("Location", ["filename", "lineno"])
+
+RED = "\033[0;31m"
+GREEN = "\033[0;32m"
+BLUE = "\033[0;34m"
+NC = "\033[0m"  # No Color
+
+def print_error(message: str, filename: str, line_number: int):
+    if os.getenv("GITHUB_ACTIONS") == "true": # We're on github, output in a special format.
+        print(f"::error file={filename},line={line_number},title=Restricted Type in File::{filename}:{line_number}: {RED}{message}{NC}")
+    else:
+        print(f"{filename}:{line_number}: {RED}{message}{NC}")
+
+if __name__ == "__main__":
+    print("no_duplicate_definitions started")
+
+    exit_code = 0
+    start = time.time()
+
+    dm_files = glob.glob("**/*.dm", recursive=True)
+
+    if len(sys.argv) > 1:
+        dm_files = sys.argv[1:]
+
+    all_failures = []
+
+    all_types = defaultdict(list)
+
+    for code_filepath in dm_files:
+        with open(code_filepath, encoding="UTF-8") as code:
+            filename = code_filepath.split(os.path.sep)[-1]
+
+            definition_matcher = re.compile(r'^(\/[\w][\w/]*?)(?: *\/[/*].*)?$')
+            for idx, line in enumerate(code):
+                if(rematch_result := re.search(definition_matcher, line)):
+                    typepath = rematch_result.group(1)
+                    if(not typepath):
+                        print_error("Failed to find a type, despite matching regex. If this happens, this CI is probably broken.", code_filepath, idx + 1)
+                        continue
+                    all_types[typepath].append(Location(code_filepath, idx + 1))
+
+    for key, value_list in all_types.items():
+        if len(value_list) > 1:
+            for location in value_list:
+                print_error(f"Found a duplicate definition of {key}.", location.filename, location.lineno)
+                exit_code = 1
+
+    end = time.time()
+    print(f"no_duplicate_definitions tests completed in {end - start:.2f}s\n")
+
+    sys.exit(exit_code)