refactor: generalize toggle_todo pattern for multiple markers

lua/todoer/init.lua

@@ -191,29 +191,24 @@ local function setup_buffer_keymaps()
         end
 	end
 
-	-- function that checks if the current line starts with the string "- [ ]" or "- [x]" and toggles the x
-    -- (Will be updated in Step 2 to handle *, +)
+	-- Toggles the checkbox [ ] <-> [x] for lines starting with -, *, +, or #
 	local function toggle_todo()
-		local openpattern = "%- %[[ ]%]"
-		local closedpattern = "%- %[[x]%]"
-		local titleopenpattern = "# %[[ ]%]" -- Keep title toggle for now? Or remove? Let's keep it.
-		local titleclosedpattern = "# %[[x]%]"
-
 		local line = vim.api.nvim_get_current_line()
-
-		if string.match(line, openpattern) then
-			line = string.gsub(line, openpattern, "- [x]", 1) -- Replace only first instance
-			vim.api.nvim_set_current_line(line)
-		elseif string.match(line, closedpattern) then
-			line = string.gsub(line, closedpattern, "- [ ]", 1) -- Replace only first instance
-			vim.api.nvim_set_current_line(line)
-		elseif string.match(line, titleopenpattern) then
-			line = string.gsub(line, titleopenpattern, "# [x]", 1)
-			vim.api.nvim_set_current_line(line)
-		elseif string.match(line, titleclosedpattern) then
-			line = string.gsub(line, titleclosedpattern, "# [ ]", 1)
-			vim.api.nvim_set_current_line(line)
+        -- Pattern captures:
+        -- 1: Prefix (indentation, marker '-', '*', '+', or '#', and whitespace)
+        -- 2: State (' ' or 'x')
+        -- 3: Rest of the line (after ']')
+		local prefix, state, rest = string.match(line, "^([%s]*[%-#%*%+]%s*)%[([ x])%](.*)")
+
+		if prefix then -- Check if the pattern matched (i.e., it's a toggleable line)
+			-- Determine the new state
+			local new_state = (state == ' ') and 'x' or ' '
+			-- Reconstruct the line with the new state
+			local new_line = prefix .. "[" .. new_state .. "]" .. rest
+			-- Update the current line
+			vim.api.nvim_set_current_line(new_line)
 		end
+        -- If the pattern didn't match, do nothing.
 	end
 
 	-- Set up buffer-local keymaps