# Callisto

A featureful runtime for Lua 5.4, written in C99 using POSIX APIs.

Callisto is an extension to Lua that adds commonly-needed functions
and features to the language, and includes a file library to manage
and manipulate files, a process library to find active processes and
manipulate signals, a socket and networking library using LuaSocket,
and a JSON manipulation library *among many more*.

Before I made Callisto, I usually had to rely on three libraries:
luaposix for basic file manipulation and other routines, lua-cjson
for JSON parsing support and LuaSocket for networking.

First and foremost, Callisto tries to satisfy these requirements:
 - an all-in-one zero-dependencies library for Lua that includes
   most features people would need, out of the box
 - a library that works and integrates well with Lua and its
   standard library, and is easy to use

Currently Callisto only works on POSIX operating systems such as
Linux and the BSDs (mainly because I don't have a machine running
Windows).

## Dependencies

To build Callisto, you'll need a C compiler and *ar* (a standard
Unix archiving utility, should be included on every major Unix).
The default C compiler is *cc* which is usually a symbolic link to
your system's default C compiler. This should be gcc on Linux, and
clang on most of the BSDs. If *cc* doesn't exist on your system,
change the `CC` variable in the Makefile to your desired C compiler.

At runtime you will need only these two libraries:
 - libm: basic math operations
 - libreadline: REPL history

Both of these are very common and should be already installed on
your machine.

## Installation

Callisto is distributed as source-only, but don't worry, it's
not hard to compile.

First, get the source code using `git clone https://github.com/jtbx/callisto`
then in the newly created directory, run `make` to compile Callisto.
The compiled executable will be named `csto`, and does not depend
on any Lua .so C modules or Lua files.

To install `csto` (the Callisto standalone executable) and
`libcallisto.so` (the Callisto shared library), run `make install`
as the root user in the source code directory.