init.lua

local M = {}

function M:peek()
	local child = Command("antiword")
		:args({
			"-t",
			tostring(self.file.url),
		})
		:stdout(Command.PIPED)
		:stderr(Command.PIPED)
		:spawn()

	if not child then
		return self:fallback_to_builtin()
	end

	local limit = self.area.h
	local i, lines = 0, ""
	repeat
		local next, event = child:read_line()
		if event == 1 then
			ya.err(tostring(event))
		elseif event ~= 0 then
			break
		end

		i = i + 1
		if i > self.skip then
			lines = lines .. next
		end
	until i >= self.skip + limit

	child:start_kill()
	if self.skip > 0 and i < self.skip + limit then
		ya.manager_emit(
			"peek",
			{ tostring(math.max(0, i - limit)), only_if = tostring(self.file.url), upper_bound = "" }
		)
	else
		lines = lines:gsub("\t", string.rep(" ", PREVIEW.tab_size))
		ya.preview_widgets(self, { ui.Paragraph.parse(self.area, lines) })
	end
end

function M:seek(units)
	local h = cx.active.current.hovered
	if h and h.url == self.file.url then
		local step = math.floor(units * self.area.h / 10)
		ya.manager_emit("peek", {
			tostring(math.max(0, cx.active.preview.skip + step)),
			only_if = tostring(self.file.url),
		})
	end
end

function M:fallback_to_builtin()
	local err, bound = ya.preview_code(self)
	if bound then
		ya.manager_emit("peek", { bound, only_if = self.file.url, upper_bound = true })
	elseif err and not err:find("cancelled", 1, true) then
		ya.preview_widgets(self, {
			ui.Paragraph(self.area, { ui.Line(err):reverse() }),
		})
	end
end

function M:is_installed(app)
	local handle = io.popen("command -v " .. app .. " >/dev/null 2>&1 && echo 'true' || echo 'false'")
	local result = handle:read("*a")
	handle:close()
	return result:match("true") ~= nil
end

return M