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--[[
Shows how to define a callback to be invoked as soon as an option is parsed.
Callbacks are useful for abruptive options like "--help" or "--version" where
you might want to stop the execution of the parser/program if passed.
Try this file with the following commands lines;
example.lua --version
example.lua -v
example.lua
--]]
local cli = require "cliargs"
-- this is called when the flag -v or --version is set
local function print_version()
print(cli.name .. ": version 1.2.1")
os.exit(0)
end
cli:set_name("try_my_version.lua")
cli:flag("-v, --version", "prints the program's version and exits", print_version)
-- Parses from _G['arg']
local args, err = cli:parse()
-- something wrong happened, we print the error and exit
if not args then
print(err)
os.exit(1)
end
-- if we got to this point, it means -v (or --version) were not passed:
print "Why, hi!"
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