I want to exit the execution of a Lua script on some condition. For example:
content = get_content()
if not content then
-- ( Here i want some kind of exit function )
next_content = get_content()
--example there can lot of further checks
Here I want that if I am not getting content my script suppose to terminate is should not go to check to next.
Use os.exit() or just return from some "main" function if your script is embedded.
os.exit()
kill process by sending a signal
do return end
stop execution
The two methods are not equal if you want to write and execute some luacode in the interpreter after stopping the execution by launching your program using the -i flag.
th -i main.lua
In lua 5.2.0-beta-rc1+, you can add a label at the end of your code called ::exit:: or something of the like, and then whenever you need to exit the program just call it like this:
goto exit
os.exit(ERROR_CODE) e.g. os.exit(1) is an answer.
Below is my practical example working with MS OS:
require("config_fonts")
local success, config_fonts = pcall(require, "config_fonts")
if not success then
print("Error loading config_fonts.lua:", config_fonts)
os.exit(1)
end
In a .bat or .cmd file:
%LUA% lua\some_script.lua
if errorlevel 1 (
echo [ERROR] Failed to process something
goto eof )
os.exit()does just that.