Add files mode

torrent-tiny

@@ -1,6 +1,8 @@
 #!/usr/bin/env python3
 import enum
+import functools
 import hashlib
+import operator
 import sys
 
 
@@ -85,6 +87,9 @@ def bdecode(fp, display = False, infoWrite = None):
 	if c != b'd':
 		raise ValueError
 	stateStack = [ParserState.NONE, ParserState.DICTIONARY]
+	idxStack = [None, None]
+	out = {}
+	get_o = lambda: functools.reduce(operator.getitem, idxStack[2:], out)
 	inInfo = False
 	print_ = print if display else (lambda *args, **kwargs: None)
 	print_(f'(global): {dictEntry}')
@@ -95,6 +100,7 @@ def bdecode(fp, display = False, infoWrite = None):
 			c = fp.read(1)
 			if c == b'e': # End of dict
 				stateStack.pop(-1)
+				idxStack.pop(-1)
 				if len(stateStack) == 2 and inInfo and infoWrite:
 					inInfo = False
 					fp = fp.fp
@@ -106,19 +112,31 @@ def bdecode(fp, display = False, infoWrite = None):
 					fp = CopyingFileReader(fp, infoWrite)
 				v = read_or_stack_value(fp, stateStack)
 				print_(f'{indent}{key!r}: {v!r}')
+				if v is dictEntry or v is listEntry:
+					get_o()[key] = {} if v is dictEntry else []
+					idxStack.append(key)
+				else:
+					get_o()[key] = v
 			else:
 				raise ValueError
 		elif state == ParserState.LIST:
 			c = fp.read(1)
 			if c == b'e':
 				stateStack.pop(-1)
+				idxStack.pop(-1)
 				continue
 			else:
 				v = read_or_stack_value(fp, stateStack, c)
 				print_(f'{indent}- {v!r}')
+				o = get_o()
+				if v is dictEntry or v is listEntry:
+					o.append({} if v is dictEntry else [])
+					idxStack.append(len(o) - 1)
+				else:
+					o.append(v)
 		elif state == ParserState.NONE:
 			assert len(stateStack) == 1
-			return
+			return out
 
 
 def print_torrent(fp):
@@ -131,10 +149,16 @@ def get_info_hash(fp):
 	return hasher.hexdigest()
 
 
+def print_files(fp):
+	o = bdecode(fp)
+	for f in o['info']['files']:
+		print('/'.join(f['path']))
+
+
 def main():
-	if len(sys.argv) < 3 or sys.argv[1] not in ('print', 'infohash'):
+	if len(sys.argv) < 3 or sys.argv[1] not in ('print', 'infohash', 'files'):
 		print('Usage: torrent-tiny MODE FILE [FILE...]', file = sys.stderr)
-		print('MODEs: print, infohash', file = sys.stderr)
+		print('MODEs: print, infohash, files', file = sys.stderr)
 		sys.exit(1)
 
 	mode = sys.argv[1]
@@ -144,6 +168,8 @@ def main():
 				print_torrent(fp)
 			elif mode == 'infohash':
 				print(get_info_hash(fp))
+			elif mode == 'files':
+				print_files(fp)
 
 
 if __name__ == '__main__':