Chubek/FewlPP.rkt

FewPP.rkt is a C preprocessor, which has only one directive, but this directive is powerful enough: it adds a Fork-Exec-Wait loop function to the program text.

If you wish to know what FEWLs are, please read my other Gist -> here

This preprocessor has only one directive, as stated above, and accepts text only via STDIN and outputs only to STDOUT. You should feed it text annoted with #fewl directives, like this simple program:

(CAREFUL, WARNING, PAY ATTENTION, THIS IS NO JOKE!) -> Never pass it the rm command!

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>

#fewl (#n exec_ls) (#p [char* path]) (#f ls) (#a "-a" path)


int main() { exec_ls("/"); }

The arguments to the directive are in S-Expression syntax (except #p, as we'll see).

#n -> Name of the function

#p -> Function parameters (which you can use in #a)

#f -> The command program name (for example ls, echo or your own program or script)

#a -> The arguments

You need to separate multiple parameters with comman, like:

(#p [int a, char*b])

In #a, you need to enclose non-parameter arguments in quotes, as you can clealy see in the example.

Also, you need to either include unistd.h and stdlib.h and also sys/wait.h, or define pid_t, NULL and EXIT_FAILURE via the -D directive.

Enjoy!