I've had a couple ideas for modifications to the Scheme reader that I imagine would be front-ends to the compiler. Examples:
1. A front end which reads Scheme source but specially handles square braces, transforming them into Objective-C method calls via my library, so that I can put the following in a program:
(let ((s [[NSString alloc] initWithCapacity:42])) ...)
And have it dispatch non-dynamically (my current project is completely dynamic).
2. A testing library where "check" forms appear under each function in the same file as documentation. The check forms normally expand to nothing, but a command can be run from the command line scans the current directory and sub-directories for .scm files which (check ...) forms in them and runs them.
3. A complete environment with support for a lot of SRFI's and utility functions built in - a new REPL/compiler which is specialized for some domain.
Black hole appears to do something like this.
My question is, how do I hook into Gambit to compile or interpret after I've transformed the code, preserving line numbers?