How to install Egison (Homebrew)
Mac users can install Egison with Homebrew by the following simple commands!
$ brew update
$ brew tap egison/egison
$ brew install egison egison-tutorialHow to install Egison (Haskell Platform)
1. Install Haskell Platform
To install Egison, you need to install Haskell Platform.
This is because Egison is implemented in Haskell and distributed as a Hackage package.
You can download an installer from here.
2. Install Egison via Hackage
After you installed Haskell Platform, perform the following commands in Command Prompt.
% cabal update
% cabal install egison egison-tutorial
...
Installing executable(s) in /home/xxx/.cabal/bin
Registering egison-X.X.X...
The egison and egison-tutorial commands are installed in ~/.cabal/bin/ by the above the package.
So please add the following lines to your .bashrc or .zshenv.
PATH=:$HOME/.cabal/bin:$PATH
export PATHHow to start Egison
Now, you can run Egison interpreter with the egison command.
Type Control-D to terminate the interpreter.
% egison
Egison Version X.X.X (C) 2011-20XX Satoshi Egi
http://www.egison.org
Welcome to Egison Interpreter!
> ^D
Leaving Egison Interpreter.
You can run the egison-tutorial command, too.
Type Control-D to terminate the tutorial.
This is a tutorial command for beginner.
Please try it first!
% egison-tutorial
Egison Tutorial for Version X.X.X (C) 2013-20XX Satoshi Egi
http://www.egison.org
Welcome to Egison Tutorial!
==============================
List of sections in the tutorial
1: Calculate numbers
2: Basics of functional programming
3: Define your own functions
4: Basic of pattern-matching
5: Pattern-matching against infinite collections
6: Writing scripts in Egison
==============================
Choose a section to learn.
(1-6): 5
====================
We can write a pattern-matching against infinite lists even if that has infinite results.
Note that Egison really enumerate all pairs of two natural numbers in the following example.
Examples:
(take 10 (match-all nats (set integer) [> [m n]]))
====================
>