-- Runs ./build.sh from vis's cwd (project root), logs the output for the
-- error picker (pickers.errors), and returns to vis on Enter/Esc.
local M = {}

-- last build's output; pickers.errors() reads it
M.log = '/tmp/vis-build.log'

-- single-quote a string for the shell
local function q(s) return "'" .. s:gsub("'", "'\\''") .. "'" end

-- write a raw escape sequence straight to the terminal
local function tty(s)
	local t = io.open('/dev/tty', 'w')
	if t then t:write(s) t:close() end
end

local function exists(path)
	local f = io.open(path, 'r')
	if f then f:close() end
	return f ~= nil
end

-- args: flags passed through to build.sh, e.g. { 'run' }
function M.run(args)
	if not exists('build.sh') then
		vis:info('No build.sh in current directory')
		return
	end

	-- save so the build sees your latest changes
	local file = vis.win and vis.win.file
	if file and file.modified and file.path then vis:command('w') end

	local parts = {}
	for _, a in ipairs(args or {}) do parts[#parts + 1] = q(a) end
	local argstr = table.concat(parts, ' ')

	local script = table.concat({
		'saved=$(stty -g); stty sane',
		-- script runs the build on a pty (colors stay on) and logs it to M.log
		'script -qefc ' .. q('bash ./build.sh ' .. argstr) .. ' ' .. q(M.log),
		'st=$?',
		[[printf '\n[exit %s]  enter/esc: back to vis ' "$st"]],
		[[while IFS= read -rsn1 k; do [ -z "$k" ] || [ "$k" = $'\e' ] && break; done]],
		'stty "$saved"',
	}, '\n')

	-- leave the alt screen and clear it, so each run starts fresh and the
	-- output lands in normal scrollback; run; come back to vis
	tty('\27[?1049l\27[H\27[2J')
	os.execute('bash -c ' .. q(script) .. ' </dev/tty >/dev/tty 2>&1')
	tty('\27[?1049h')
	vis:redraw()
end

-- ---------------------------------------------------------------------------
-- events
-- ---------------------------------------------------------------------------

-- re-index tags in the background after saving an .odin file
-- (build.sh -t re-scans src and merges it with the cached stdlib tags)
vis.events.subscribe(vis.events.FILE_SAVE_POST, function(file, path) -- luacheck: no unused args
	if path and path:match('%.odin$') and exists('build.sh') then
		os.execute('bash ./build.sh -t </dev/null >/dev/null 2>&1 &')
	end
end)

return M