## ml
is a small lisp interpreter based on Adam McDaniel's wisp interpreter (https://github.com/adam-mcdaniel/wisp). It's main purpose is to learn something about more recent c++ 


### Example of use
```
cat <<EOT > /tmp/qs.lsp
(defn qs (l)
    (if (<= (len l) 1)
        l
        (do
            (def pivot (first l))
            (+
                (qs (filter (lambda (n) (> pivot n)) l))
                (list pivot)
                (qs (tail (filter (lambda (n) (<= pivot n)) l)))
            ))
    ))

(print (qs '(10 9 8 7 6 5 4 3 2 10)))
EOT

ml -f /tmp/qs.lsp
```
or
```
ml -f tests/test.lsp
```
#### Interactive mode
```
ml
```

#### Documentation
see /doc/Doc.md

#### Dependencies
- libssl-dev

#### Compile
```
mkdir -p build
gcc -std=c99 -c -O2 -o linenoise.o clib/linenoise.c
c++ -c -O2  -I/usr/local/opt/openssl/include -Iclib --std=c++17  ml.cpp ml_io.cpp ml_date.cpp ml_string.cpp ml_util.cpp ml_profiler.cpp ml_usql.cpp clib/json11.cpp clib/csvparser.cpp clib/sslclient.cpp clib/printf.cpp usql/exception.cpp usql/lexer.cpp usql/parser.cpp usql/usql.cpp usql/table.cpp usql/table.h usql/row.cpp usql/csvreader.cpp usql/usql.cpp usql/usql_ddl.cpp usql/usql_dml.cpp usql/settings.cpp

// on linux c++ -o build/ml -O2 -L/usr/local/lib -L/usr/local/opt/openssl/lib -lm -lstdc++ -lcrypto -lssl *.o
c++ -o build/ml -O2 -L/usr/local/lib -L/usr/local/opt/openssl/lib -lm -lstdc++ -lcrypto -lssl -Wl,-stack_size -Wl,0x1000000 *.o
```
or use 
```
cmake .
make
```

#### Install
```
cp build/ml /usr/local/bin/ml
cp stdlib/*.lsp /usr/local/var/mlisp/
cp doc/*.md /usr/local/var/mlisp/
```
or
```
utils/local_install.sh
```


### KNOWNN BUGS
- (read-url "https://api.nasdaq.com/api/calendar/dividends/") ; hangs in sslclient.cpp line 132

### TODO
- add test for >>> (range 1.5 (inc 5.5)) => (1.500000 2.500000 3.500000 4.500000 5.500000)
- ml_utils.cpp add all commands into const std::vector<std::string> commands
- unify -f and -run options
- add debug support, at least call stack
- multiline editing (see kilocpp editor)
- execute system command should capture stderr
- add mem stats to benchmark
- order of arguments in functions like member and filter - filter swap lambda and list
- better output of !e in repl (resp !e !ee)

#### Doc
- string-case, make-csv fix doc
- add functions from stdlib into doc
- doc for set!

#### Code
- tcpnet should use RAII
- add more unit test, especially for usql
- add instrumentation (time, nr of evals, num of atoms, debug info, debug environment etc)

#### Language
- string functions
    - compare - needed for sorting, cmp ignore case
    - regexp match, regexp tokens    

#### Performance
- push_back - repeatedly without reserving size
- mini_sprintf - unnecesary copying between vector and list
- (do, scope, cond ..) repeatedly assign to acc


### Links
https://github.com/adam-mcdaniel/wisp  
https://github.com/dropbox/json11  
https://github.com/antirez/linenoise


#### read stdout and stderr from popen
https://stackoverflow.com/questions/478898how-do-i-execute-a-command-and-get-the-output-of-the-command-within-c-using-po