Worksheets on scratch buffers

[domaspoliakas]

Describe the feature

Worksheets that use a scratch buffer instead of being saved on disk.

Potential ways to implement?

From discord:

for example just add a "Create scratch worksheet" command in here https://github.com/scalameta/nvim-metals/blob/main/lua/metals/commands.lua
and then add a function in here that it can call https://github.com/scalameta/nvim-metals/blob/main/lua/metals.lua
and you can see here as an example how I create a scratch buffer

nvim-metals/lua/metals/decoder.lua

Lines 40 to 57 in 22a0f9f

	if exists then
	api.nvim_buf_set_lines(exists, 0, -1, false, lines)
	api.nvim_win_set_buf(0, exists)
	else
	local new_buffer = api.nvim_create_buf(true, true)
	api.nvim_buf_set_lines(new_buffer, 0, -1, false, lines)
	api.nvim_buf_set_name(new_buffer, name)
	-- TODO we should probably do something better for this case, but java is
	-- a bit nicer syntax for these than scala
	if decoder == "javap" then
	api.nvim_buf_set_option(new_buffer, "syntax", "java")
	else
	api.nvim_buf_set_option(new_buffer, "syntax", "scala")
	end
	api.nvim_win_set_buf(0, new_buffer)
	end
	end
	end

Additional context

N/A

Search terms

Worksheets worksheet scratch buffer disk

[ckipp01]

Thanks for the request @domaspoliakas! Thinking about and playing around with this a bit we hit on a snag right away that you can't really save a scratch buffer which means you can't get the didSave notification sent to the server to both get diagnostics and results of the worksheet. You can try to hack around this but it might be messy.

Another idea would be to just create either a tmp file or like a .metals/scratch.worksheet.sc. Then a quick worksheet command could always just open that up if it exists or create a new one.