--- a/hglib.lua	Thu Sep 08 13:03:21 2016 +0800
+++ b/hglib.lua	Thu Sep 08 13:05:13 2016 +0800
@@ -83,6 +83,20 @@
 	end
 end
 
+function Client:getencoding()
+	if not self.capabilities.getencoding then
+		return nil, 'getencoding is not supported by this command server'
+	end
+	self.wh:write('getencoding\n')
+	self.wh:flush()
+	local channel, message = read_channel(self.rh)
+	if channel == 'r' then
+		return message
+	elseif channel == 'e' then
+		return nil, message
+	end
+end
+
 return {
 	read_u4 = read_u4,
 	read_c = read_c,

--- a/spec/hglib_spec.lua	Thu Sep 08 13:03:21 2016 +0800
+++ b/spec/hglib_spec.lua	Thu Sep 08 13:05:13 2016 +0800
@@ -21,4 +21,12 @@
 		assert.are_equal('number', type(client.lpcpid))
 		client:close()
 	end)
+
+	it('can send getencoding command', function()
+		local client = hglib.Client.open()
+		local encoding, err = client:getencoding()
+		client:close()
+		assert.is_nil(err)
+		assert.are_equal('string', type(encoding))
+	end)
 end)