Refactor code and add option -ab=c

.gitignore

@@ -138,3 +138,4 @@ dmypy.json
 # Cython debug symbols
 cython_debug/
 
+.vscode

pargv.py

@@ -18,30 +18,29 @@ def parse_args(argv=None):
         args.append(arg.replace('-', '_'))
 
     kwargs = {}
-    values = []
+    value = None
     for arg in argv[len(args):]:
-        if not arg.startswith('-'):
-            values.append(arg)
-            continue
-        if len(values):
-            kwargs[key] = values
-            values = []
-        key = arg[:2].lstrip('-') + arg[2:].replace('-', '_')
-        if arg.startswith('--'):
-            if '=' in arg:
-                key, value = key.split('=')
-                values.append(value)
-                kwargs[key] = values
-            else:
-                kwargs[key] = True
-        elif arg.startswith('-'):
-            for k in key:
-                kwargs[k] = True
-            key = arg[-1]
-    if len(values):
-        kwargs[key] = values
 
-    for k, v in kwargs.items():
-        if isinstance(v, list) and len(v) == 1:
-            kwargs[k] = v[0]
+        if not arg.startswith('-'):
+            if isinstance(kwargs[key], bool):
+                kwargs[key] = arg
+            elif isinstance(kwargs[key], str):
+                kwargs[key] = [kwargs[key]] + [arg]
+            elif isinstance(kwargs[key], list):
+                kwargs[key].append(arg)
+            continue
+
+        key = arg[:2].lstrip('-') + arg[2:].replace('-', '_')
+
+        if '=' in key:
+            key, value = key.split('=')
+
+        if not arg.startswith('--'):
+            for k in key[:-1]:
+                kwargs[k] = True
+            key = key[-1]
+
+        kwargs[key] = value if value else True
+        value = None
+
     return (args, kwargs)