diagnostic_rightalign.lua

diagnostic_rightalign.lua

local strdisplaywidth = require("plenary").strings.strdisplaywidth
local rightAlignFormat = function(diagnostic)
	local msg = diagnostic.message
	local line = diagnostic.lnum
	local line_length = strdisplaywidth(vim.api.nvim_buf_get_lines(0, line, line + 1, false)[1] or "")
	local msg_length = strdisplaywidth(msg)
	local wininfo = vim.fn.getwininfo(vim.api.nvim_get_current_win())[1]
	-- https://github.com/neovim/neovim/issues/17229
	local textoff = wininfo.textoff
	local wwidth = wininfo.width

	local sp = ""
	-- -4: -2 for minimal default spacing that i can't control, -2 for prefix
	local maxrightwidth = wwidth - textoff - line_length - 4
	if msg_length > maxrightwidth then
		msg = string.sub(msg, 1, maxrightwidth - 1) .. "…"
	else
		local splen = wwidth - textoff - line_length - msg_length - 4
		sp = string.rep(" ", splen)
	end
	return string.format("%s» %s", sp, msg)
end

-- vim.diagnostic.config({
--	virtual_text = {
--		format = rightAlignFormat,
--		spacing = 0,
--		prefix = "",
--		suffix = "",
--	},
-- })