chore: add autosave for markdown files

.config/nvim/lua/core/autosave.lua

@@ -0,0 +1,42 @@
+local group = vim.api.nvim_create_augroup('NotesAutosave', { clear = true })
+
+local note_filetypes = {
+   markdown = true,
+   telekasten = true,
+}
+
+local function should_save(buf)
+   if not vim.api.nvim_buf_is_valid(buf) then return false end
+   if not note_filetypes[vim.bo[buf].filetype] then return false end
+   if not vim.bo[buf].modified then return false end
+   if vim.bo[buf].readonly or not vim.bo[buf].modifiable then return false end
+   if vim.api.nvim_buf_get_name(buf) == '' then return false end
+   return true
+end
+
+local function save(buf)
+   if should_save(buf) then vim.api.nvim_buf_call(buf, function()
+      vim.cmd('silent! write')
+   end) end
+end
+
+vim.api.nvim_create_autocmd({
+   'BufLeave',
+   'WinLeave',
+   'FocusLost',
+}, {
+   group = group,
+   callback = function(args)
+      save(args.buf)
+   end,
+})
+
+vim.api.nvim_create_autocmd({
+   'CursorHold',
+   'CursorHoldI',
+}, {
+   group = group,
+   callback = function(args)
+      save(args.buf)
+   end,
+})