# Calculator

A calculator repl.

## Features

- Arithmetic
- Standard mathematical functions
- Variable bindings
- Function bindings
  - Single argument functions
  - Multiple argument functions
- Plotting (Optional)
  - Static plots (no animation)
  - Dynamic plots (for multiple argument functions)

## Installation and plotting support

The plotting support is optional as it requires `gtk2hs`. It is off by default, and can be turned on using a configuration as shown.

To install *without* plotting support.

```bash
$ stack install calculator
```

To install *with* plotting support.

```bash
$ stack install calculator --flags="plot-gtk-ui"
```

## TODO

    Lots and lots of testing.

## Implementation

* Written in haskell
* Parsing done using [parsec](https://hackage.haskell.org/package/parsec)
* Repl built using [haskeline](https://hackage.haskell.org/package/haskeline)
* Colored output using ANSI color codes

## Usage

    Use :? to view usage instructions.

## Thanks

* Thanks to [husky](https://github.com/markusle/husky) for color output.