feat: Adding a new function and shortcut for toggling a TODO checkbox

when using a markdown file for a TODO list.

nvim/lua/plugins/telekasten.lua

@@ -1,3 +1,30 @@
+function string.insert(str1, str2, pos)
+    return str1:sub(1, pos)..str2..str1:sub(pos+1)
+end
+
+function toggleTODO(current_line)
+    local todo_str = '%- %[ %] '
+    local todo_checked_str = '%- %[x%] '
+
+    if current_line:find(todo_str, 1) then
+        return string.gsub(current_line, todo_str, '', 1)
+    elseif current_line:find(todo_checked_str, 1) then
+        return string.gsub(current_line, todo_checked_str, '', 1)
+    else
+        local first_idx = current_line:find('[%-%w]', 1) - 1
+        return string.insert(current_line, '- [ ] ', first_idx)
+    end
+end
+
+vim.api.nvim_create_user_command('ToggleTODO', function()
+    local current_line = vim.api.nvim_get_current_line()
+    local row, col = unpack(vim.api.nvim_win_get_cursor(0))
+
+    local new_line = toggleTODO(current_line)
+
+    vim.api.nvim_buf_set_lines(0, row-1, row, true, {new_line})
+end, {})
+
 return {
     'renerocksai/telekasten.nvim',
     config = function()
@@ -25,6 +52,7 @@ return {
         { '<leader>zp', ':Telekasten panel<CR>' },
         { '<leader>zn', ':Telekasten find_notes<CR>' },
         { '<leader>zt', ':Telekasten show_tags<CR>' },
+        { '<leader>tt', ':ToggleTODO<CR>' },
     },
     -- lazy = false
 }