SKILL.md

name: cosmo-lua description: Use cosmopolitan Lua (cosmo-lua) for portable scripts. Includes HTTP, JSON, unix syscalls, path utils, regex, sqlite, argon2. allowed-tools: [Read, Write, Edit, Bash, Glob, Grep]

Cosmo Lua

Portable Lua 5.4 with batteries included. Single binary runs on Linux, macOS, Windows, FreeBSD, OpenBSD, NetBSD.

Installation

curl -L -o lua https://github.com/whilp/cosmopolitan/releases/latest/download/lua
chmod +x lua
./lua --skill  # install this skill

Getting Help

The executable has built-in documentation. help is a global function:

./lua -e 'help("cosmo.Fetch")'         # look up a function
./lua -e 'help("cosmo.unix")'          # list module functions
./lua -e 'help.search("socket")'       # search by keyword

In the REPL:

help()                -- overview of all modules
help("cosmo.Fetch")   -- function docs
help("cosmo.unix")    -- module functions

Quick Reference

Top-level functions: local cosmo = require("cosmo") Submodules: local unix = require("cosmo.unix")

HTTP & Networking (replaces curl, luasocket)

Function	Purpose
`Fetch(url)`	HTTP GET/POST with redirects, TLS, proxy support
`ResolveIp(host)`	DNS lookup
`ParseUrl(url)`	Parse URL into components
`FormatIp(ip)`	Format IP address
`IsPublicIp(ip)`	Check if IP is public

JSON (replaces dkjson, cjson)

Function	Purpose
`DecodeJson(str)`	Parse JSON string to Lua table
`EncodeJson(tbl)`	Encode Lua table to JSON string

Encoding & Hashing

Function	Purpose
`EncodeBase64(s)`	Base64 encode
`DecodeBase64(s)`	Base64 decode
`EncodeHex(s)`	Hex encode
`DecodeHex(s)`	Hex decode
`Sha256(s)`	SHA-256 hash
`Sha1(s)`	SHA-1 hash
`Md5(s)`	MD5 hash
`GetRandomBytes(n)`	Cryptographic random bytes

Compression

Function	Purpose
`Deflate(s)`	Compress with zlib
`Inflate(s)`	Decompress zlib

Path Utilities: `require("cosmo.path")`

Function	Purpose
`path.join(...)`	Join path components
`path.basename(p)`	Get filename from path
`path.dirname(p)`	Get directory from path
`path.exists(p)`	Check if path exists
`path.isfile(p)`	Check if path is file
`path.isdir(p)`	Check if path is directory

POSIX/Unix: `require("cosmo.unix")`

Function	Purpose
`unix.open(path, flags, mode)`	Open fd
`unix.read(fd)`	Read from fd
`unix.write(fd, data)`	Write to fd
`unix.close(fd)`	Close fd
`unix.chmod(path, mode)`	Change file mode
`unix.mkdir(path, mode)`	Create directory
`unix.makedirs(path, mode)`	Create directory tree
`unix.stat(path)`	Get file metadata
`unix.fork()`	Fork process
`unix.execve(prog, args)`	Execute program
`unix.environ()`	Get environment
`unix.getpid()`	Get process ID
`unix.sleep(secs)`	Sleep
`unix.clock_gettime()`	High-resolution time

Octal modes: Lua has no octal literals. Use tonumber("755", 8) for modes.

See help("unix") for 100+ additional syscall wrappers.

Regular Expressions: `require("cosmo.re")`

Function	Purpose
`re.search(pattern, str)`	Search for pattern
`re.compile(pattern)`	Compile regex for reuse
`regex:search(str)`	Search with compiled regex

SQLite: `require("cosmo.lsqlite3")`

Function	Purpose
`sqlite.open(path)`	Open database
`sqlite.open_memory()`	Open in-memory database
`db:exec(sql)`	Execute SQL
`db:prepare(sql)`	Prepare statement
`stmt:step()`	Execute prepared statement
`db:close()`	Close database

Password Hashing: `require("cosmo.argon2")`

Function	Purpose
`argon2.hash_encoded(pw, salt)`	Hash password
`argon2.verify(encoded, pw)`	Verify password

Example

local cosmo = require("cosmo")
local path = require("cosmo.path")

-- Fetch JSON from an API
local status, headers, body = cosmo.Fetch("https://api.example.com/data")
if status == 200 then
  local data = cosmo.DecodeJson(body)
  print(data.message)
end

-- Work with files
local configpath = path.join(os.getenv("HOME"), ".config", "app.json")
if path.exists(configpath) then
  local f = io.open(configpath)
  local config = cosmo.DecodeJson(f:read("*a"))
  f:close()
end

More Information

Use help.search(keyword) to find functions. The help system has complete documentation for all functions including parameters, return values, and examples.

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