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--[[ 50-autowrite.lua — opt-in per-buffer autosave, writing the buffer back to disk as it changes.
A buffer flagged for autowrite is written (`:update`) after every normal-mode change and on leaving
insert mode.
Only normal, named, writable buffers are written, so scratch, unnamed and read-only buffers never
trigger a write error.
AutoWrite is off by default and per-buffer: the state lives in `vim.b.autowrite` and shows as the
`+W` flag in the statusline (see 50-ui.lua).
Turning autowrite on saves the buffer immediately, so it starts out in sync with the disk.
User commands:
`AutoWriteToggle`: toggle autosave for the current buffer
Keymaps:
`<Leader>bs` toggle autosave for the current buffer
]]
-- True when `buf` is a normal, named, writable file buffer that `:update` can save.
local function writable(buf)
return vim.bo[buf].buftype == ""
and vim.api.nvim_buf_get_name(buf) ~= ""
and vim.bo[buf].modifiable
and not vim.bo[buf].readonly
end
-- Write the changed buffer when it is flagged for autowrite and safe to save.
local function write_flagged_buffer(args)
if vim.b[args.buf].autowrite and writable(args.buf) then
vim.api.nvim_buf_call(args.buf, vim.cmd.update)
end
end
--[[ Flip autowrite for the current buffer.
Save immediately when turning it on so the buffer catches up with its pending changes. ]]
local function toggle_autowrite()
vim.b.autowrite = not vim.b.autowrite
if vim.b.autowrite and writable(0) then
vim.cmd.update()
end
vim.notify(
"Buffer autowrite " .. (vim.b.autowrite and "enabled" or "disabled") .. " for this buffer",
vim.log.levels.INFO
)
vim.cmd.redrawstatus()
end
--[[ `nested` so the `:update` fires `BufWritePre`, letting the format engine (50-format.lua) run
its on-write formatter. ]]
vim.api.nvim_create_autocmd({ "TextChanged", "InsertLeave" }, {
group = vim.g.dotfiles_augroup,
nested = true,
callback = write_flagged_buffer,
})
vim.api.nvim_create_user_command(
"AutoWriteToggle",
toggle_autowrite,
{ desc = "Toggle buffer autowrite" }
)
vim.keymap.set("n", "<Leader>bs", toggle_autowrite, { desc = "Toggle buffer autowrite" })
local help = require("help")
help.register("General", {
maps = { { "<Leader>bs", "Toggle buffer autowrite" } },
commands = { { "AutoWriteToggle", "Toggle buffer autowrite" } },
})
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