fix: prevent double indent on enter for non-empty todos

lua/todoer/init.lua

@@ -19,7 +19,8 @@ local function get_line_details(lnum)
   -- Returns: indent, marker, space_after_marker
   local marker_pattern = "^(%s*)([%-%*%+])(%s+)"
   -- Pattern captures marker, checkbox '[ ]' or '[x]', and optional space after checkbox
-  local todo_pattern = "^%s*[%-%*%+]%s+%[([ x])%]%s*"
+  -- Matches lines like: "- [ ] task", "* [x] task", "+ [ ] task"
+  local todo_pattern = "^(%s*[%-%*%+]%s+)%[([ x])%]%s*" -- Capture prefix before checkbox
 
   local _, marker_match, _ = string.match(line, marker_pattern)
   local is_todo = (string.match(line, todo_pattern) ~= nil)
@@ -110,21 +111,50 @@ end
 
 -- Internal function to set up buffer-local keymaps
 local function setup_buffer_keymaps()
-	-- add new todo line when previous is already a todo (Will be refactored in Step 3)
+	-- Handles Enter key press in Insert mode
 	local function press_enter()
-		local current_line = vim.api.nvim_get_current_line()
+        local details, lnum = get_current_line_details()
-		-- Check if the current line matches the pattern (Only checks '-' marker currently)
+        if not details then
-		local pattern = "^%s*%- %[[ x]%]%s*$" -- Simplified pattern to check if it's an empty-ish TODO line
+            -- Fallback if getting details fails for some reason
-        local content_pattern = "^%s*%- %[[ x]%]%s+(.+)" -- Pattern to check if there's content
+            return vim.api.nvim_replace_termcodes("<CR>", true, false, true)
+        end
+
+        -- Check if the line is a TODO item and if it has content after the marker
+        local has_content = details.content and not vim.trim(details.content):empty()
+
+        if details.is_todo and has_content then
+            -- Case 1: Non-empty TODO line
+            -- Create a new TODO line below with same indent/marker
+            local new_marker = details.marker or "-" -- Should always have marker if is_todo, but safety check
+            local new_line_content = details.indent .. new_marker .. " [ ] "
+
+            -- Insert the new line below the current one
+            vim.api.nvim_buf_set_lines(0, lnum, lnum, false, { new_line_content })
 
-		if string.match(current_line, content_pattern) then -- If it's a TODO with content
+            -- Move cursor to the new line, after the "] "
-            local indent = string.match(current_line, "^%s*") or ""
+            local cursor_col_bytes = #new_line_content
-			vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes("<CR>"..indent.."- [ ] ", true, false, true), "n", false)
+            vim.api.nvim_win_set_cursor(0, { lnum + 1, cursor_col_bytes })
-		elseif string.match(current_line, pattern) then -- If it's an empty TODO line
+
-			-- Current behavior: clear line and insert newline (will change in Step 3)
+            -- Action handled, return empty string because mapping is expr=true
-			vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes("<Esc>S<CR>", true, false, true), "n", false)
+            return ""
-		else -- Not a TODO line
+
-			vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes("<CR>", true, false, true), "n", false)
+        elseif details.is_todo and not has_content then
+            -- Case 2: Empty TODO line (e.g., "- [ ]")
+            -- TODO: Implement Step 3 logic (outdenting) here later.
+            -- For now, keep the old (potentially problematic) feedkeys behavior
+            -- or simply clear the line and let Neovim handle Enter.
+            -- Let's try clearing the line and returning <CR> for now.
+            vim.api.nvim_buf_set_lines(0, lnum - 1, lnum, false, { details.indent }) -- Replace with just indent
+            return vim.api.nvim_replace_termcodes("<CR>", true, false, true) -- Let Neovim handle newline
+
+            -- Old feedkeys behavior (kept for reference, but commented out):
+            -- vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes("<Esc>S<CR>", true, false, true), "n", false)
+            -- return "" -- Feedkeys handles it
+
+        else
+            -- Case 3: Not a TODO line
+            -- Let Neovim handle the Enter key press normally
+            return vim.api.nvim_replace_termcodes("<CR>", true, false, true)
         end
 	end
 
@@ -132,12 +162,14 @@ local function setup_buffer_keymaps()
 	local function press_tab()
 		local current_line = vim.api.nvim_get_current_line()
 		-- Check if current line matches the patterns (Only checks '-' marker currently)
+        -- TODO: Update pattern to match *, + as well
 		local pattern = "^%s*%- %[[ x]%]"
 		if string.match(current_line, pattern) then
 			-- print("tab pressed, allegedly") -- Removed print
 			vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes("<C-t>", true, false, true), "i", false)
+            return "" -- Action handled by feedkeys
 		else
-            -- Return <Tab> to allow default behavior if expr=true is set on mapping
+            -- Return <Tab> to allow default behavior
             return vim.api.nvim_replace_termcodes("<Tab>", true, false, true)
         end
 	end
@@ -146,12 +178,14 @@ local function setup_buffer_keymaps()
 	local function press_shift_tab()
 		local current_line = vim.api.nvim_get_current_line()
 		-- Check if current line matches the patterns (Only checks '-' marker currently)
+        -- TODO: Update pattern to match *, + as well
 		local pattern = "^%s*%- %[[ x]%]"
 		if string.match(current_line, pattern) then
 			-- print("shift tab pressed, allegedly") -- Removed print
 			vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes("<C-d>", true, false, true), "i", false)
+            return "" -- Action handled by feedkeys
 		else
-            -- Return <S-Tab> to allow default behavior if expr=true is set on mapping
+            -- Return <S-Tab> to allow default behavior
             return vim.api.nvim_replace_termcodes("<S-Tab>", true, false, true)
         end
 	end