#!/usr/bin/env luna
-- Showcase os.args(): the command-line arguments passed to the script.
--
-- Try:
--   luna lua/demo/args.lua greet --name=World extra
--   luna --sandbox lua/demo/args.lua -- greet --name=World
-- or make the file executable and call it directly (the shebang works too):
--   chmod +x lua/demo/args.lua
--   ./lua/demo/args.lua greet --name=World

local args = os.args()

print("os.args() = " .. utils.dump(args))

if #args == 0 then
    print("no arguments given — try: luna lua/demo/args.lua greet --name=World extra")
    return
end

-- A tiny argument parser: --key=value pairs become options, the rest positionals.
local opts, positional = {}, {}
for _, arg in ipairs(args) do
    local key, value = arg:match("^%-%-([%w-]+)=(.*)$")
    if key then
        opts[key] = value
    else
        table.insert(positional, arg)
    end
end

print("options     = " .. utils.dump(opts))
print("positionals = " .. utils.dump(positional))

if positional[1] == "greet" then
    print(("Hello, %s!"):format(opts.name or "stranger"))
end