Im going insane

tools/UpdatePaths/Update Paths.bat

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+@echo off
+call "%~dp0\..\bootstrap\python" -m UpdatePaths %*
+pause

tools/UpdatePaths/__main__.py

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+# A script and syntax for applying path updates to maps.
+import re
+import os
+import sys
+import argparse
+from mapmerge2 import frontend
+from mapmerge2.dmm import *
+
+desc = """
+Update dmm files given update file/string.
+Replacement syntax example:
+    /turf/open/floor/iron/warningline : /obj/effect/turf_decal {dir = @OLD ;tag = @SKIP;icon_state = @SKIP}
+    /turf/open/floor/iron/warningline : /obj/effect/turf_decal {@OLD} , /obj/thing {icon_state = @OLD:name; name = "meme"}
+    /turf/open/floor/iron/warningline{dir=2} : /obj/thing
+    /obj/effect/landmark/start/virologist : @DELETE
+    /mob/living{resize = @ANY} : /mob/living{@OLD; resize = @SKIP}
+Syntax for subtypes also exist, to update a path's type but maintain subtypes:
+    /obj/structure/closet/crate/@SUBTYPES : /obj/structure/new_box/@SUBTYPES {@OLD}
+New paths properties:
+    @DELETE - if used as new path name the old path will be deleted
+    @OLD - if used as property name copies all modified properties from original path to this one
+    property = @SKIP - will not copy this property through when global @OLD is used.
+    property = @OLD - will copy this modified property from original object even if global @OLD is not used
+    property = @OLD:name - will copy [name] property from original object even if global @OLD is not used
+    Anything else is copied as written.
+Old paths properties:
+    Will be used as a filter.
+    property = @UNSET - will apply the rule only if the property is not mapedited
+    property = @ANY - will apply the rule when the property is mapedited, regardless of its value.
+"""
+
+default_map_directory = "../../_maps"
+replacement_re = re.compile(r'\s*(?P<path>[^{]*)\s*(\{(?P<props>.*)\})?')
+
+#urgent todo: replace with actual parser, this is slow as janitor in crit
+split_re = re.compile(r'((?:[A-Za-z0-9_\-$]+)\s*=\s*(?:"(?:.+?)"|[^";][^;]*)|@OLD);?')
+
+
+def props_to_string(props):
+    return "{{{}}}".format(";".join([f"{k} = {v}" for k, v in props.items()]))
+
+
+def string_to_props(propstring, verbose = False):
+    props = dict()
+    for raw_prop in re.split(split_re, propstring):
+        if not raw_prop or raw_prop.strip() == ';':
+            continue
+        prop = raw_prop.split('=', maxsplit=1)
+        props[prop[0].strip()] = prop[1].strip() if len(prop) > 1 else None
+    if verbose:
+        print("{0} to {1}".format(propstring, props))
+    return props
+
+
+def parse_rep_string(replacement_string, verbose = False):
+    # translates /blah/blah {meme = "test",} into path,prop dictionary tuple
+    match = re.match(replacement_re, replacement_string)
+    path = match['path']
+    props = match['props']
+    if props:
+        prop_dict = string_to_props(props, verbose)
+    else:
+        prop_dict = dict()
+    return path.strip(), prop_dict
+
+
+def update_path(dmm_data, replacement_string, verbose=False):
+    old_path_part, new_path_part = replacement_string.split(':', maxsplit=1)
+    old_path, old_path_props = parse_rep_string(old_path_part, verbose)
+    new_paths = list()
+    for replacement_def in new_path_part.split(','):
+        new_path, new_path_props = parse_rep_string(replacement_def, verbose)
+        new_paths.append((new_path, new_path_props))
+
+    subtypes = ""
+    if old_path.endswith("/@SUBTYPES"):
+        old_path = old_path[:-len("/@SUBTYPES")]
+        if verbose:
+            print("Looking for subtypes of", old_path)
+        subtypes = r"(?:/\w+)*"
+
+    replacement_pattern = re.compile(rf"(?P<path>{re.escape(old_path)}(?P<subtype>{subtypes}))\s*(:?{{(?P<props>.*)}})?$")
+
+    def replace_def(match):
+        if match['props']:
+            old_props = string_to_props(match['props'], verbose)
+        else:
+            old_props = dict()
+        for filter_prop in old_path_props:
+            if filter_prop not in old_props:
+                if old_path_props[filter_prop] == "@UNSET":
+                    continue
+                else:
+                    return [match.group(0)]
+            else:
+                if old_path_props[filter_prop] == "@ANY":
+                   continue
+                elif old_props[filter_prop] != old_path_props[filter_prop] or old_path_props[filter_prop] == "@UNSET":
+                    return [match.group(0)] #does not match current filter, skip the change.
+        if verbose:
+            print("Found match : {0}".format(match.group(0)))
+        out_paths = []
+        for new_path, new_props in new_paths:
+            if new_path == "@OLD":
+                out = match.group('path')
+            elif new_path == "@DELETE":
+                if verbose:
+                    print("Deleting match : {0}".format(match.group(0)))
+                return [None]
+            elif new_path.endswith("/@SUBTYPES"):
+                path_start = new_path[:-len("/@SUBTYPES")]
+                out = path_start + match.group('subtype')
+            else:
+                out = new_path
+
+            out_props = dict()
+            for prop_name, prop_text in new_props.items():
+                prop_value = str(prop_text)
+                if prop_name == "@OLD":
+                    out_props = dict(old_props)
+                    continue
+                if prop_value == "@SKIP":
+                    out_props.pop(prop_name, None)
+                    continue
+                if prop_value.startswith("@OLD"):
+                    params = prop_value.split(":")
+                    out_props[prop_name] = old_props[params[1]] if len(params) > 1 else old_props[prop_name]
+                    continue
+                out_props[prop_name] = prop_value
+            if out_props:
+                out += props_to_string(out_props)
+            out_paths.append(out)
+        if verbose:
+            print("Replacing with: {0}".format(out_paths))
+        return out_paths
+
+    def get_result(element):
+        match = replacement_pattern.match(element)
+        if match:
+            return replace_def(match)
+        else:
+            return [element]
+
+    bad_keys = {}
+    modified_keys = []
+    keys = list(dmm_data.dictionary.keys())
+    for definition_key in keys:
+        def_value = dmm_data.dictionary[definition_key]
+        new_value = tuple(y for x in def_value for y in get_result(x) if y != None)
+        if new_value != def_value:
+            dmm_data.overwrite_key(definition_key, new_value, bad_keys)
+            modified_keys.append(definition_key)
+    dmm_data.reassign_bad_keys(bad_keys)
+    return modified_keys
+
+
+def update_map(map_filepath, updates, verbose=False):
+    print("Updating: {0}".format(map_filepath))
+    dmm_data = DMM.from_file(map_filepath)
+    modified_keys = []
+    for update_string in updates:
+        modified_keys.extend(update_path(dmm_data, update_string, verbose))
+    dmm_data.remove_unused_keys(modified_keys)
+    dmm_data.to_file(map_filepath)
+
+
+def update_all_maps(map_directory, updates, verbose=False):
+    for root, _, files in os.walk(map_directory):
+        for filepath in files:
+            if filepath.endswith(".dmm"):
+                path = os.path.join(root, filepath)
+                update_map(path, updates, verbose)
+
+
+def main(args):
+    if args.inline:
+        print("Using replacement:", args.update_source)
+        updates = [args.update_source]
+    else:
+        with open(args.update_source) as f:
+            updates = [line for line in f if line and not line.startswith("#") and not line.isspace()]
+        print(f"Using {len(updates)} replacements from file:", args.update_source)
+
+    if args.map:
+        update_map(args.map, updates, verbose=args.verbose)
+    else:
+        map_directory = args.directory or frontend.read_settings().map_folder
+        update_all_maps(map_directory, updates, verbose=args.verbose)
+
+
+if __name__ == "__main__":
+    prog = __spec__.name.replace('.__main__', '')
+    if os.name == 'nt' and len(sys.argv) <= 1:
+        print("usage: drag-and-drop a path script .txt onto `Update Paths.bat`\n  or")
+
+    parser = argparse.ArgumentParser(prog=prog, description=desc, formatter_class=argparse.RawTextHelpFormatter)
+    parser.add_argument("update_source", help="update file path / line of update notation")
+    parser.add_argument("--map", "-m", help="path to update, defaults to all maps in maps directory")
+    parser.add_argument("--directory", "-d", help="path to maps directory, defaults to _maps/")
+    parser.add_argument("--inline", "-i", help="treat update source as update string instead of path", action="store_true")
+    parser.add_argument("--verbose", "-v", help="toggle detailed update information", action="store_true")
+    main(parser.parse_args())