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#!/usr/bin/env -S guile --no-auto-compile
!#
(use-modules (ice-9 match)
(ice-9 popen)
(ice-9 pretty-print))
(define (main input-port)
(define highlighter
(open-output-pipe "source-highlight -s scheme -f esc | $PAGER"))
(define (exn-handler exn)
(close-pipe highlighter) ; make sure $PAGER doesn't mess up the terminal
(raise-exception exn)) ; re-raise exception
(define (pretty-printer)
(match (read input-port)
((? eof-object? _)
(close-pipe highlighter))
(thing
(pretty-print thing highlighter)
(newline highlighter) ; add empty line between top-level forms
(pretty-printer))))
(with-exception-handler exn-handler pretty-printer))
(define (help-message program-name)
(string-append "\
usage: " (basename program-name) " [-h] FILENAME
This utility reads a Guile scheme file and pretty-prints it, throwing
away any original formatting and comments.
arguments:
-h, --help show this message and exit
FILENAME the scheme file name to pretty-print; required
"))
(match (program-arguments)
((program-name
. (? (lambda (args)
(or (member "-h" args)
(member "--help" args)))
_))
(display (help-message program-name)))
((_ input-file)
(call-with-input-file input-file main))
((program-name . _)
(display "error: invalid number of arguments\n\n"
(current-error-port))
(display (help-message program-name)
(current-error-port))
(exit 1)))
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