The _readline_ collection (not to be confused with MzScheme's
`read-line' procedure) provides glue for using GNU's readline library
with the MzScheme read-eval-print-loop.


Normal use of readline
----------------------

The _rep.ss_ library installs a readline-based function for the
prompt-and-read part of MzScheme's read-eval-print loop.

I put the following in my ~/.mzschemerc so that MzScheme always starts
with readline support:

 (require (lib "rep.ss" "readline"))

The readline history is stored across invocations in MzScheme's
preferences file, assuming MzScheme exits normally.


Direct bindings for readline hackers
------------------------------------

The _readline.ss_ library provides two functions:

> (readline prompt-string) - prints the given prompt string and reads
  an S-expression.

> (add-history s) - adds the given string to the readline history,
  which is accessible to the user via the up-arrow key