### TODO
- move system_cmd into ml_io
- logical operators  
- documentation
- add url of source/inspiration to clib/*.cpp
- load std lib when starting
- add more command line args
- add stdtest 
- rename ivaluize
- add benchmark
- add some debug support??
- add instrumentation (time, nr of evals, debug info, debug environment etc)
- in cating functions (as_string..) better exception description
- add fuctions asecond,third, fourth...
- add better print (syntaxhighligting)
- add options -h -v


#### Functionality
- readline
- execute system command
- printf
- support for including lisp lib
- date support
- file functions
  - name it here
- string funtions
    - name it here
- add hash datatype
- add support for nil


#### Performance
- push_back - repeately without reserving size



### Example of use
```
time ./build/ml -c '(include "../example.lisp") (print (fact 1000))'
./build/ml -f debug.lisp
```

### Links
https://www.tutorialspoint.com/lisp/index.htm
https://github.com/adam-mcdaniel/wisp

https://github.com/dropbox/json11

#### std::vector
https://stackoverflow.com/questions/12271017/initial-capacity-of-vector-in-c
https://baptiste-wicht.com/posts/2012/12/cpp-benchmark-vector-list-deque.html

#### parse http headers in c++
```
^(?:((?:https?|s?ftp):)\/\/)([^:\/\s]+)(?::(\d*))?(?:\/([^\s?#]+)?([?][^?#]*)?(#.*)?)?
```

https://stackoverflow.com/questions/25896916/parse-http-headers-in-c