@@ -6,10 +6,12 @@
 	['html:gen-styles'] = true;
 }
 
 local function
-main(input, output, log, mode, suggestions, vars)
-	local doc = ct.parse(input.stream, input.src, mode)
+main(input, output, log, mode, suggestions, vars, extrule)
+	local doc = ct.parse(input.stream, input.src, mode, function(c)
+		                     c.doc.ext = extrule
+	                     end)
 	input.stream:close()
 	if mode['parse:show-tree'] then
 		log:write(ss.dump(doc))
 	end
@@ -73,8 +75,13 @@
 
 			['mode-set-weak'] = 1;
 			['mode-clear-weak'] = 1;
 			['mode-weak'] = 2;
+			['use'] = 1;
+			['inhibit'] = 1;
+			['need'] = 1;
+			['load'] = 1;
+			['enc'] = 1;
 		}
 		return param_opts[o] or 0
 	end
 
@@ -86,9 +93,14 @@
 		h = 'help';
 		y = 'mode-set',   Y = 'mode-set-weak';
 		n = 'mode-clear', N = 'mode-clear-weak';
 		m = 'mode',       M = 'mode-weak';
+		L = 'load',
+		u = 'use', i = 'inhibit', r = 'require';
+		e = 'enc';
 	}
+
+	local extrule = {use={},inhibit={},need={}}
 
 	local checkmodekey = function(key)
 		if not key:match '[^:]+:.+' then
 			ct.exns.cli('invalid mode key %s', key):throw()
@@ -120,9 +132,13 @@
 
 		['mode-weak'] = function(key,value) suggestions[checkmodekey(key)] = value end;
 		['mode-set-weak'] = function(key) suggestions[checkmodekey(key)] = true end;
 		['mode-clear-weak'] = function(key) suggestions[checkmodekey(key)] = false end;
-
+		['use'    ] = function(ext) extrule.use    [ext] = true end;
+		['inhibit'] = function(ext) extrule.inhibit[ext] = true end;
+		['require'] = function(ext) extrule.need   [ext] = true end;
+		['load'] = function(extpath) end;
+		['enc'] = function(enc) end;
 		['version'] = function()
 			outp:write(ct.info:about())
 			if next(ct.ext.loaded) then
 				outp:write('\nactive extensions:\n')
@@ -178,9 +194,9 @@
 			if keepParsing and longopt then
 				execLongOpt(longopt)
 			else
 				if keepParsing and v:sub(1,1) == '-' then
-					for c,p in ss.str.enc.utf8.each(v:sub(2)) do
+					for c,p in ss.str.each(ss.str.enc.utf8, v:sub(2)) do
 						if optmap[c] then
 							execLongOpt(optmap[c])
 						else
 							ct.exns.cli('switch -%s unrecognized', c):throw()
@@ -200,13 +216,13 @@
 		input.stream = file
 		input.src.file = args[1]
 	end
 
-	return main(input, outp, log, mode, suggestions, vars)
+	return main(input, outp, log, mode, suggestions, vars, extrule)
 end
 
-local ok, e = pcall(entry_cli)
--- local ok, e = true, entry_cli()
+-- local ok, e = pcall(entry_cli)
+local ok, e = true, entry_cli()
 if not ok then
 	local str = 'translation failure'
 	if ss.exn.is(e) then
 		str = e.kind.desc