add --context (per-directory encoding config)

aux.py

@@ -3,6 +3,8 @@
 
 import os
 import pathlib
+import over
+prefix = over.core.text.prefix
 
 # --------------------------------------------------
 
@@ -27,3 +29,74 @@ def to_Path(raw_path):
 		raw_path = os.path.expanduser(raw_path)
 	
 	return pathlib.Path(raw_path)
+
+# --------------------------------------------------
+
+def _serialize(d):
+	"""
+	Transforms d into a string compatible with over config files.
+	"""
+	
+	if type(d) is str:
+		return '"' + d.replace('"', '\\"') + '"'
+	else:
+		return str(d)
+
+def update_cfg_context(main):
+	"""
+	All main.options that are sourced from either the cfg file or defaults get overridden by those in .over-video.
+	Those that are from command line get saved into .over-video.
+	
+	File format:
+	name=value
+	"""
+	
+	options = {o.name: o for o in main.options}
+	overrides = {}
+	
+	try:
+		with open(".over-video") as f:
+			for i, line in enumerate(f):
+				line = line.strip()
+				
+				if not line:
+					continue
+				
+				try:
+					name, value = line.split("=")
+				except ValueError:
+					main.print(".over-video §rsyntax error§/ on line §B{:d}§/: §y{:s}§/".format(i, line), prefix.fail)
+					main.print("fix the error or set §B--no-§gcontext§/")
+					main.exit(1)
+				
+				try:
+					option = options[name]
+					
+					try:
+						overrides[name] = over.core.app._parse(value, option.dtype)
+					except:
+						main.print(".over-video §rdata syntax error§/ on line §B{:d}§/: §y{:s}§/".format(i, line), prefix.fail)
+						main.print("fix the error or set §B--no-§gcontext§/")
+						main.exit(1)
+				except KeyError:
+					main.print(".over-video option §y{:s}§/ §rdoes not exist§/".format(name), prefix.warn)
+	except FileNotFoundError:
+		pass
+	
+	main.print("syncing context (from .over-video)", prefix.start)
+	
+	for option in options.values():
+		if option.name in overrides and option.source is not "cmdline":
+			override = overrides[option.name]
+			main.print("using §B--§g{:s}§/ = §m{:s}§/".format(option.name, str(override)))
+			option.value = override
+		elif option.source is "cmdline":
+			overrides[option.name] = option.value
+			main.print("storing §B--§g{:s}§/ = §m{:s}§/".format(option.name, str(option.value)))
+	
+	with open(".over-video", "w") as f:
+		for name, value in overrides.items():
+			line = "{:s}={:s}\n".format(name, _serialize(value))
+			f.write(line)
+	
+	main.print("syncing context", prefix.done)