compile-r7rs is a tool to compile R7RS Scheme programs, it aims for compability
with [SRFI-138](https://srfi.schemers.org/srfi-138/srfi-138.html).

## Dependencies

For scripts:

    apt install sharutils

For binaries:

    apt install build-essential

For jar:

    apt install default-jdk

## Installing

    make install

## Usage

The environment variable SCMC must be set to the same value as the
implementations command.  The command is the first word on the list.
So for example guile for Guile, csi for Chicken interpreter, csc for Chicken
compiler.

If the command has .exe at it's end cross compilation from Linux to .exe with
Wine is assumed.


Run

    SCMC=<SCHEME> compile-r7rs -I <DIR> <file.scm>

So for example to build hello-world.scm with Racket for both Linux and Wine run:

    SCMC=racket compile-r7rs -I ./snow hello-world.scm
    SCMC=racket.exe compile-r7rs -I ./snow hello-world.scm

Libraries in these commands are assumed to be under snow directory, so library
(foo bar) would be in snow/foo/bar.sld.

## Outputs

### Self contained, self extracting and runnable shell script

Requires the Scheme implementation to be installed to run.

- chibi-scheme
- csi (Chicken)
- icyc (Cyclone)
- gsi (Gambit)
- gosh (Gauche)
- guile
- mosh
- sash
- stklos
- skint
- tr7i (tr7)
- ypsilon

### Static binary executable

Does not require Scheme implementation to be installed to run.

- csc (Chicken)
- racket (Racket)

### Java ARchive (JAR)

Only requires Java to be installed to run.

- kawa
    - The build folder needs to contain kawa.jar

### .exe

- racket.exe
    - Install Racket and r7rs library with Wine to default locations

## How it works

The scripts searches for .sld files in given paths, compiles them if needed and combines them with
the main script to form something that can be run on it's own. Meaning that the only thing the
person running the things needs, might be, the Scheme implementation, Java, or nothing.