# Python-based fx-92 Scientifique Collège+ interpreter

This is an alternate imlementation of the fx-92 SC+ Algorithmic application. It
interprets programs read from QR code URLs or text files, and renders images
using the SDL.

Requirements:
* Python ≥ 3.5 (may work with older versions)
* PySDL2 (`pip3 install --user PySDL2`)

## Running programs

To run programs, execute `fx92.py` and specify an input file:

```
./fx92.py [-s|-u] <input file> [options...]
```

* If the input file contains text instructions (for example `goto 12,35`),
  specify `-s` (this is the default).
* If the input file contains a QR code URL (for example
  `https://...F908313200333500`), specify `-u`.

The input can also be set to `-`, in which case the interpreter reads from
standard input. Typical use case is for URLs:

```
echo -n "F908313200333500" | ./fx92.py -u -
```

## Output options

* `--scale <n>` lets you set the (integer) scaling ratio of the output.
* `--save <bmp>` will save a screenshot of the output to the designated file.
* `--quiet` will "hide" the window while executing. _(At the moment the window
  is still shown, but closed immediately, due to SDL subtleties.)_
* `--stream <dir>` will stream window frames as a series of bitmap images to
  the specified directory. Use your favorite tool to make a GIF.

## Tests

A few units tests are provided. Run `tests.py` to execute them.