Rewind

A Scheme-inspired shell and a programming language.

Building

Build with make and run with ./rewind.
Optionally, you can install the program (after a successful build) with
[sudo] make install. sudo is optional. If sudo is present, Rewind will be installed in
/usr/bin/rewind. Otherwise, it will be installed in $HOME/.local/bin/rewind.

Dependencies

• Matchit (for pattern matching in some code regions).
  • You can find it here
• GNU Readline.

Examples

Once started, Rewind will greet you with a very barebone REPL in which you may enter any valid Rewind expression. The special expressions exit and (exit) terminate the program.
For a detailed introduction to the language, and a reference for all its operators and their semantics, see the Rewind Github wiki.

Custom prompts and the Rewind config file

Rewind supports a config file for easy storing of common variables and functions you might want to preserve in between interactive sessions. Optionally, if the very last expression in the config file is a function call that returns a string, or it's a string literal, that will be chosen as the interactive prompt for Rewind. The following is an example of a valid prompt snippet: (in your ~/.config/config.re)

let prompt ()
  s+ (get PWD) " λ ";

prompt

Unsurprisingly, the resulting Rewind prompt will be like this (if you're in the root directory of Rewind):

/home/<user>/path/to/Rewind λ with your username instead of <user>, and the full path to Rewind before the lambda, with no shortenings whatsoever.