ruff: load all the error codes at once

vcs-diff-lint-csdiff-ruff

@@ -9,6 +9,7 @@ The script accepts the same parameters as `ruff check` itself.
 """
 
 import os
+from functools import cache
 import sys
 import json
 from subprocess import Popen, PIPE
@@ -24,16 +25,19 @@ def ruff_check():
     return json.loads(out)
 
 
-def ruff_code_to_name(code):
+@cache
+def ruff_code_to_name():
     """
-    Convert noqa code e.g. F401 to its human-readable name, e.g. unused-import
+    Introspect ruff and map all possible noqa codes to a human-readable names.
     """
-    # This implementation will likely kill all ruff performance benefits
-    cmd = ["ruff", "rule", code, "--output-format=json"]
+    cmd = ["ruff", "rule", "--all", "--output-format=json"]
     with Popen(cmd, stdout=PIPE) as proc:
         out, _err = proc.communicate(timeout=60)
-    data = json.loads(out)
-    return data["name"]
+    the_map = {}
+    array = json.loads(out)
+    for rule in array:
+        the_map[rule["code"]] = rule['name']
+    return the_map
 
 
 def main():
@@ -46,7 +50,7 @@ def main():
         column = defect["location"]["column"] or ""
         colsep = ":" if column else ""
         event = "{0}[{1}]".format(
-            defect["code"], ruff_code_to_name(defect["code"]))
+            defect["code"], ruff_code_to_name()[defect["code"]])
 
         print("Error: RUFF_WARNING:")
         print("{file}:{line}{colsep}{column}: {event}: {msg}".format(