Add filter to only autosave specified file types

README.md

@@ -244,6 +244,7 @@ These are the conditions that every file must meet so that it can be saved. If e
 + `modifiable`: (Boolean) if true, enables this condition. If the file isn't modifiable, then this condition isn't met.
 + `filename_is_not`: (Table, Strings) if there is one or more filenames (should be strings) in the table, it enables this condition. Use this to exclude filenames that you don't want to automatically save.
 + `filetype_is_not`: (Table, Strings) if there is one or more filetypes (should be strings) in the table, it enables this condition. Use this to exclude filetypes that you don't want to automatically save.
++ `filetype_is`: (Table, Strings) if there is one or more filetypes (should be strings) in the table, it enables this condition. Use this to restrict the filetypes that are autosaved to only those specified.
 
 ## Hooks
 Use them to execute code at certain events [described by their names]. These are the ones available:

lua/autosave/config.lua

@@ -8,6 +8,7 @@ config.options = {
 		exists = true,
 		filename_is_not = {},
 		filetype_is_not = {},
+		filetype_is = {},
 		modifiable = true,
 	},
     write_all_buffers = false,

lua/autosave/modules/autocmds.lua

@@ -53,7 +53,7 @@ local function actual_save()
 end
 
 local function assert_user_conditions()
-	local sc_exists, sc_filename, sc_filetype, sc_modifiable = true, true, true, true
+	local sc_exists, sc_filename, sc_filetype_is_not, sc_filetype_is, sc_modifiable = true, true, true, true, true
 
 	for condition, value in pairs(opts["conditions"]) do
 		if condition == "exists" then
@@ -80,14 +80,21 @@ local function assert_user_conditions()
 		elseif condition == "filetype_is_not" then
 			if not (next(opts["conditions"]["filetype_is_not"]) == nil) then
 				if table_has_value(opts["conditions"]["filetype_is_not"], api.nvim_eval([[&filetype]])) == true then
-					sc_filetype = false
+					sc_filetype_is_not = false
+					break
+				end
+			end
+		elseif condition == "filetype_is" then
+			if not (next(opts["conditions"]["filetype_is"]) == nil) then
+				if table_has_value(opts["conditions"]["filetype_is"], api.nvim_eval([[&filetype]])) == false then
+					sc_filetype_is = false
 					break
 				end
 			end
 		end
 	end
 
-	return { sc_exists, sc_filename, sc_filetype, sc_modifiable }
+	return { sc_exists, sc_filename, sc_filetype_is_not, sc_filetype_is, sc_modifiable }
 end
 
 local function assert_return(values, expected)