dotfiles/vim/lua/test_runner.lua

_G._test_cmd_to_wins = {}

_G._build_test_cmd = function()
	local bufnr = vim.fn.bufnr("%")
	local filetype = vim.fn.getbufvar(bufnr, "&filetype")
	if filetype == "" then
		vim.api.nvim_err_writeln("cannot build test command for filetype:" .. filetype)
		return nil
	end

	local path = vim.fn.expand("%:p")

	-- TODO: allow line number to be passed
	-- TODO: check file exists before running command
	if filetype == "ruby" then
		if not path:find("_spec.rb") then
			path = path:gsub("/app/", "/spec/"):gsub([[.rb$]], "_spec.rb")
		end

		return "bundle exec rspec --format=progress --no-profile " .. path
	elseif filetype == "go" then
		return "go test -v " .. path:gsub("^(.*)/(.*go)$", "%1/...")
	else
		vim.api.nvim_err_writeln("filetype not supported: " .. filetype)
		return nil
	end
end

_G.run_tests = function()
	local cmd = _G._build_test_cmd()
	if cmd == nil then
		return
	end

	vim.api.nvim_command([[silent up]])

	local winid = _G._test_cmd_to_wins[cmd]
	local current_winid = vim.fn.win_getid()
	if
		winid == nil
		or not vim.api.nvim_win_is_valid(winid)
		or winid == current_winid
		or not vim.fn.win_gotoid(winid) == -1
	then
		vim.api.nvim_command([[10split]])
		winid = vim.fn.win_getid()
		_G._test_cmd_to_wins[cmd] = winid
	end

	local buf = vim.api.nvim_create_buf(false, true)
	vim.api.nvim_buf_set_option(buf, "bufhidden", "delete")
	vim.api.nvim_win_set_buf(winid, buf)

	vim.fn.termopen(cmd)
	vim.api.nvim_command([[normal! G]])
	vim.api.nvim_command([[wincmd p]])
end

_G.focus_tests = function()
	local cmd = _G._build_test_cmd()
	if cmd == nil then
		return
	end

	local winid = _G._test_cmd_to_wins[cmd]
	if winid == nil or not vim.api.nvim_win_is_valid(winid) then
		return
	end

	vim.fn.win_gotoid(winid)
	vim.api.nvim_command([[wincmd =]])
end

_G.close_tests = function()
	local current_winid = vim.api.nvim_get_current_win()
	for _, winid in pairs(_G._test_cmd_to_wins) do
		if current_winid == winid and vim.api.nvim_win_is_valid(winid) then
			vim.api.nvim_win_close(winid, false)
			return
		end
	end

	local cmd = _G._build_test_cmd()
	if cmd == nil then
		return
	end

	local winid = _G._test_cmd_to_wins[cmd]
	if winid == nil or not vim.api.nvim_win_is_valid(winid) then
		return
	end

	vim.api.nvim_win_close(winid, false)
end

_G.copy_test_cmd = function()
	local cmd = _G._build_test_cmd()
	if cmd == nil then
		return
	end

	vim.fn.setreg("+", cmd)
	print("Copied: " .. cmd)
end

vim.api.nvim_set_keymap("n", "<leader>cr", [[:lua _G.run_tests()<cr>]], { noremap = true, silent = true })
vim.api.nvim_set_keymap("n", "<leader>cf", [[:lua _G.focus_tests()<cr>]], { noremap = true, silent = true })
vim.api.nvim_set_keymap("n", "<leader>cq", [[:lua _G.close_tests()<cr>]], { noremap = true, silent = true })
vim.api.nvim_set_keymap("n", "<leader>cc", [[:lua _G.copy_test_cmd()<cr>]], { noremap = true, silent = true })