#!/opt/Lua51/bin/lua

-- Created by jiaqiang.ye@lnxall.com
-- Fetach version string from file
-- 2025/08/07

package.cpath = "/opt/Lua51/lib/lua/?.so;/opt/Lua51/lib/lua/loadall.so"
package.path = "/opt/Lua51/share/lua/?.lua;/opt/Lua51/share/lua/?/init.lua;/opt/Lua51/lib/lua/?.lua;/opt/Lua51/lib/lua/?/init.lua"

local invoker = require "invoker"
local gfmt = string.format

local g_verfile   = arg[1]
local g_verdeft   = arg[2]

local function version_default(eval)
	if type(g_verdeft) ~= "string" or #g_verdeft == 0 or not string.match(g_verdeft, "^[%w%W%.%-_]+$") then
		g_verdeft = "0.1.0"
	end
	io.stdout:write(g_verdeft)
	io.stdout:flush()
	os.exit(eval or 0)
end

local function version_lnxget()
	if type(g_verfile) ~= "string" then
		version_default(1)
	end
	if string.len(g_verfile) == 0 then
		version_default(2)
	end
	if invoker.statfile(g_verfile) ~= "regular" then
		version_default(3)
	end

	local ver = invoker.readfile(g_verfile, invoker.TRIMEND)
	if not ver or string.len(ver) == 0 then
		version_default(4)
	end

	if string.match(ver, "^[%w%W%.%-_]+$") then
		io.stdout:write(ver)
		io.stdout:flush()
		os.exit(0)
	end

	io.stderr:write(gfmt("Error, invalid version string: %s\n", ver))
	io.stderr:flush()
	version_default(5)
end

version_lnxget()