toggle todo lines!!! first try!

README.md

@@ -211,6 +211,7 @@ The plugin defines the following functions.
 - `yank_notelink()` : yank a link to the current note, ready to paste
 - `show_calendar()` : opens up the calendar in a properly-sized vertical split at the very right
 - `paste_img_and_link()` : pastes an image from the clipboard into a file under `image_subdir` and inserts a link to it at the current cursor position
+- `toggle_todo()` : turn a line into a `- [ ] ` line, or toggle between `- [ ]`, `- [x]`, and `- `.
 - `setup(opts)`: used for configuring paths, file extension, etc.
 
 To use one of the functions above, just run them with the `:lua ...` command.
@@ -317,12 +318,13 @@ nnoremap <leader>zN :lua require('telekasten').new_templated_note()<CR>
 nnoremap <leader>zy :lua require('telekasten').yank_notelink()<CR>
 nnoremap <leader>zc :lua require('telekasten').show_calendar()<CR>
 nnoremap <leader>zi :lua require('telekasten').paste_img_and_link()<CR>
+nnoremap <leader>zt :lua require('telekasten').toggle_todo()<CR>
 
 " we could define [[ in **insert mode** to call insert link
 " inoremap [[ <ESC>:lua require('telekasten').insert_link()<CR>
 " alternatively: leader [
 inoremap <leader>[ <ESC>:lua require('telekasten').insert_link()<CR>
-
+inoremap <leader>zt :lua require('telekasten').toggle_todo()<CR>
 
 " ----- the following are for syntax-coloring [[links]] and ==highlighted text==
 " ----- (see the section about coloring in README.md)

doc/telekasten.txt

@@ -404,6 +404,11 @@ telekasten.show_calendar()~
   See also:~
       - |telekasten.calendar|
 
+                                                   *telekasten.toggle_todo()*
+telekasten.toggle_todo()~
+  Turns a line into a `- [ ] ` todo line, or toggle between `- [ ]`, `- [x]`, 
+  and `-` .
+
 --------------------------------------------------------------------------------
 Section 3.1: Templates                                    *telekasten.templates*
 
@@ -428,7 +433,7 @@ The specific templates and settings used are:
 
 See also |telekasten.template_files| below for more on the specific templates.
 
-The following table shows you what action creates what kind of non-existing
+The folloet ing table shows you what action creates what kind of non-existing
 note:
 
 +----------------------------------+--------------------------------+
@@ -520,12 +525,13 @@ However, here are some suggestions:
     nnoremap <leader>zy :lua require('telekasten').yank_notelink()<CR>
     nnoremap <leader>zc :lua require('telekasten').show_calendar()<CR>
     nnoremap <leader>zi :lua require('telekasten').paste_img_and_link()<CR>
+    nnoremap <leader>zt :lua require('telekasten').toggle_todo()<CR>
 
     " we could define [[ in **insert mode** to call insert link
     " inoremap [[ <ESC>:lua require('telekasten').insert_link()<CR>
     " alternatively: leader [
     inoremap <leader>[ <ESC>:lua require('telekasten').insert_link()<CR>
-
+    inoremap <leader>zt :lua require('telekasten').toggle_todo()<CR>
 
     " the following are for syntax-coloring [[links]] and ==highlighted text==
     " (see the section about coloring in README.md)

lua/telekasten.lua

@@ -608,6 +608,35 @@ local SetupCalendar = function(opts)
 	vim.cmd(cmd)
 end
 
+local ToggleTodo = function()
+	-- replace
+	--       by -
+	-- -     by - [ ]
+	-- - [ ] by - [x]
+	-- - [x] by -
+	local linenr = vim.api.nvim_win_get_cursor(0)[1]
+	local curline = vim.api.nvim_buf_get_lines(0, linenr - 1, linenr, false)[1]
+	-- if curline.strip().startswith('- ') and not curline.strip.startswith('- [')...
+	-- print('cur: ' .. curline)
+	local stripped = vim.trim(curline)
+	local repline
+	if vim.startswith(stripped, "- ") and not vim.startswith(stripped, "- [") then
+		repline = curline:gsub("- ", "- [ ] ", 1)
+	else
+		if vim.startswith(stripped, "- [ ]") then
+			repline = curline:gsub("- %[ %]", "- [x]", 1)
+		else
+			if vim.startswith(stripped, "- [x]") then
+				repline = curline:gsub("- %[x%]", "-", 1)
+			else
+				repline = curline:gsub("(%S)", "- [ ] %1", 1)
+			end
+		end
+	end
+	vim.api.nvim_buf_set_lines(0, linenr - 1, linenr, false, repline)
+	-- print('rep: ' .. repl)
+end
+
 -- Setup(cfg)
 --
 -- Overrides config with elements from cfg. See top of file for defaults.
@@ -664,5 +693,6 @@ local M = {
 	CalendarSignDay = CalendarSignDay,
 	CalendarAction = CalendarAction,
 	paste_img_and_link = imgFromClipboard,
+	toggle_todo = ToggleTodo,
 }
 return M