add missing.py

Author: rustykitty

missing.py

@@ -0,0 +1,44 @@
+"""
+script that determines which problems I have solved but only in a different language than the given language
+"""
+
+import sys
+import os
+import re
+from collections import defaultdict
+
+if len(sys.argv) == 1:
+    sys.stderr.write('You must specify the language extension\n')
+    sys.exit(1)
+else:
+    lang = sys.argv[1]
+
+pattern = re.compile(r'^(\d{4}-[a-z0-9\-]+)(\.[a-z]{2,4})$')
+
+ignored_extensions = (
+    'js', # because of JS-only problems
+    'sh',
+    'sql',
+    'md' # not a programming language
+)
+
+files = [
+    file for file in os.listdir(os.getcwd())
+    if re.fullmatch(pattern, file) and 
+    not any(file.endswith(x) for x in ignored_extensions)
+]
+
+langs = defaultdict(set)
+
+for file in files:
+    match = re.fullmatch(pattern, file)
+    if not match: 
+        sys.stderr.write(f'{file} did not match pattern\n')
+        continue
+    langs[match.group(2)[1:]].add(file[:match.end(1)])
+
+from functools import reduce
+
+sol = reduce(lambda x, y: x | y, (x for x in langs.values() if x != lang))
+
+print(sol - langs[lang])