31.3.2 Lazy compilation with SRFI-22

SRFI-22 can be used to implement lazy compilation. For instance, let us consider the following shell script:

$ cat > bgl
#!/bin/sh
SOURCEFILE=$1
case $SOURCEFILE in
    *.scm)
        OUTFILE=${SOURCEFILE%.scm}
        if ( bigloo -s -o $OUTFILE $SOURCEFILE ); then
            /bin/rm $OUTFILE.o
            shift
            ./$OUTFILE $@
        fi
        ;;
    *)
        echo Error: need a \*.scm file!
        ;;
esac

And the following Bigloo script:

#! /usr/bin/env ./bgl
(module foo
   (main main))

(define (main argv)
   (print "foo: " argv))

When executed in the following way:

$ chmod u+x foo.scm
$ ./foo.scm
  -| foo: (./foo.scm)

The Bigloo module foo.scm will first be compiled and then executed. Of course, one may consider more complex compiler drivers where it is first checked that the module is not already compiled.

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