This is a Lisp written in C. It follows the outline in this [Build Your Own Lisp](https://buildyourownlisp.com/chapter11_variables) book, though it then adds some small tweaks and improvements and quality of life improvements:
- A makefile
- Configurable verbosity levels
- Different and perhaps slightly more elegant printing functions
- A slightly different approach to evaluating functions
- Capturing Ctrl+D
Overall this might be mostly of interest as a pointer to the book that this is originally based on. And to readers of that same book, I'd be curious to see what you ended up with.
## Installation and usage
### Dependencies
This depends on [editline](https://github.com/troglobit/editline), which can be installed on Debian/Ubuntu with:
```
git clone https://github.com/troglobit/editline
./autogen.sh
./configure
make all
sudo make install
ldconfig
```
Readers might also find it interesting to compile it with [tiny c compiler](https://bellard.org/tcc/) rather than gcc, as it is significantly faster.
### Compilation
```
git clone https://github.com/NunoSempere/mumble
make
# sudo make install #
```
### Usage
Simply call the `./mumble` binary:
```
./mumble
```
## Example usage
```
mumble> (1 2 3)
mumble> { 1 2 3 }
mumble> head (1 2 3)
mumble> { head (1 2 3) }
mumble> tail { 1 2 3 }
mumble> list ( 1 2 3 )
mumble> eval { head {1 2 3} }
mumble> (eval { head {+ tail head } } ) 1 2 3
mumble> len {1 2 3}
mumble> join { {1 2} {3 4} }
mumble> def { {x} { 100 } }
mumble> x
mumble> def { { a b c } { 1 2 3} }
mumble> * a b c
mumble> - a b c
mumble> / a b c
mumble> VERBOSITY=0
mumble> VERBOSITY=1
mumble> VERBOSITY=2
```
## Gotchas
This doesn't currently run on Windows. But it easily could, with [preprocessor statements from the book].
