#! /bin/sh
# -*-scheme-*-
MES=${MES-$(dirname $0)/mes}
moduledir=module/
echo '()' | cat $moduledir/mes/base-0.mes $0 /dev/stdin | $MES $MES_FLAGS -- "$@"
#paredit:||
r=$?
([ -f a.out ] && chmod +x a.out)
exit $r
!#

;;; Mes --- Maxwell Equations of Software
;;; Copyright © 2016,2017 Jan Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of Mes.
;;;
;;; Mes is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; Mes is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with Mes.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;;; mescc.mes is a proof-of-concept simplistic C compiler and linker

;;; Code:

;;LALR
;;(mes-use-module (language c compiler))
;;Nyacc

(mes-use-module (mes guile))
(mes-use-module (mes getopt-long))
(mes-use-module (mes pretty-print))
(mes-use-module (language c99 compiler))
(mes-use-module (mes elf))
(mes-use-module (mes hex2))
(mes-use-module (srfi srfi-1))
(mes-use-module (srfi srfi-26))

(format (current-error-port) "mescc.mes...\n")

(define %datadir (if (string-prefix? "@DATADIR" "@DATADIR@") "" "@DATADIR@"))
(define %docdir (if (string-prefix? "@DOCDIR" "@DOCDIR@") "doc/" "@DOCDIR@"))
(define %moduledir "module/")
(define %prefix (if (string-prefix? "@PREFIX" "@PREFIX@") "" "@PREFIX@"))
(define %version (if (string-prefix? "@VERSION" "@VERSION@") "git" "@VERSION@"))

(define (parse-opts args)
  (let* ((option-spec
          '((c (single-char #\c))
            (D (single-char #\D) (value #t))
            (E (single-char #\E))
            (g (single-char #\g))
            (help (single-char #\h))
            (I (single-char #\I) (value #t))
            (o (single-char #\o) (value #t))
            (version (single-char #\V) (value #t))))
         (options (getopt-long args option-spec))
         (help? (option-ref options 'help #f))
         (files (option-ref options '() '()))
         (usage? (and (not help?) (null? files)))
         (version? (option-ref options 'version #f)))
    (or
     (and version?
          (format (current-output-port) "mescc.scm (mes) ~a\n" %version))
     (and (or help? usage?)
          (format (or (and usage? (current-error-port)) (current-output-port)) "\
Usage: mescc.mes [OPTION]... FILE...
  -c                 compile and assemble, but do not link
  -D DEFINE          define DEFINE
  -E                 preprocess only; do not compile, assemble or link
  -g                 add debug info [GDB, objdump] using hex3 format
  -h, --help         display this help and exit
  -I DIR             append DIR to include path
  -o FILE            write output to FILE
  -v, --version      display version and exit
")
          (exit (or (and usage? 2) 0)))
     options)))

(define (read-object file)
  (let ((char (with-input-from-file file read-char)))
    (if (eq? char #\#) (error "hex2 format not supported:" file)))
  (with-input-from-file file read))

(define (main:ast->info file)
  (let ((ast (with-input-from-file file read)))
    (with-input-from-file file
      (lambda ()
        (c99-ast->info ast)))))

(define (source->ast defines includes)
  (lambda (file)
    (with-input-from-file file
      (lambda ()
        (pretty-print (c99-input->ast #:defines defines #:includes includes))))))

(define (source->info defines includes)
  (lambda (file)
    (with-input-from-file file
      (lambda ()
        ((c99-input->info #:defines defines #:includes includes))))))

(define (ast? o)
  (or (string-suffix? ".E" o)
      (string-suffix? ".mes-E" o)))

(define (object? o)
  (or (string-suffix? ".o" o)
      (string-suffix? ".mes-o" o)))

(define (main args)
  (let* ((args (cons* (car args) (cdr (member "--" args))))
         (options (parse-opts args))
         (files (option-ref options '() '()))
         (file (if (null? files) (string-append %docdir "examples/main.c")
                   (car files)))
         (preprocess? (option-ref options 'E #f))
         (compile? (option-ref options 'c #f))
         (debug-info? (option-ref options 'g #f))
         (asts (filter ast? files))
         (objects (filter object? files))
         (sources (filter (cut string-suffix? ".c" <>) files))
         (base (substring file (1+ (or (string-rindex file #\/) -1)) (- (string-length file) 2)))
         (out (option-ref options 'o (cond (compile? (string-append base ".o"))
                                           (preprocess? (string-append base ".E"))
                                           (else "a.out"))))
         (multi-opt (lambda (option) (lambda (o) (and (eq? (car o) option) (cdr o)))))
         (defines (reverse (filter-map (multi-opt 'D) options)))
         (includes (reverse (filter-map (multi-opt 'I) options)))
         (objects->hex (if debug-info? objects->hex3 objects->hex2)))
    (when (getenv "MES_DEBUG") (format (current-error-port) "options=~s\n" options)
          (format (current-error-port) "output: ~a\n" out))
    (if (and (pair? sources) (pair? objects)) (error "cannot mix source and object files:" files))
    (with-output-to-port (open-output-file out (if (and (not compile?)
                                                        (not preprocess?)) S_IRWXU))
      (lambda ()
        (cond ((pair? objects) (let ((objects (map read-object objects)))
                                 (if compile? (objects->hex objects)
                                     (objects->elf objects))))
              ((pair? asts) (let* ((infos (map main:ast->info asts))
                                   (objects (map info->object infos)))
                              (if compile? (objects->hex objects)
                                  (objects->elf objects))))
              ((pair? sources) (if preprocess? (map (source->ast defines includes) sources)
                                   (let* ((infos (map (source->info defines includes) sources))
                                          (objects (map info->object infos)))
                                     (if compile? (objects->hex objects)
                                         (objects->elf objects))))))))))

(main (command-line))
()