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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix 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.
;;;
;;; GNU Guix 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 GNU Guix.  If not, see <http://www.gnu.org/licenses/>.

(define-module (gnu packages c)
  #:use-module ((guix licenses) #:prefix license:)
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix build-system gnu)
  #:use-module (guix build-system trivial)
  #:use-module (gnu packages bootstrap)
  #:use-module (gnu packages perl)
  #:use-module (gnu packages texinfo)
  #:use-module (gnu packages guile))

(define-public tcc
  (package
    (name "tcc")                                  ;aka. "tinycc"
    (version "0.9.26")
    (source (origin
              (method url-fetch)
              (uri (string-append "mirror://savannah/tinycc/tcc-"
                                  version ".tar.bz2"))
              (sha256
               (base32
                "0wbdbdq6090ayw8bxnbikiv989kykff3m5rzbia05hrnwhd707jj"))))
    (build-system gnu-build-system)
    (native-inputs `(("perl" ,perl)
                     ("texinfo" ,texinfo)))
    (arguments
     `(#:configure-flags (list (string-append "--elfinterp="
                                              (assoc-ref %build-inputs "libc")
                                              ,(glibc-dynamic-linker))
                               (string-append "--crtprefix="
                                              (assoc-ref %build-inputs "libc")
                                              "/lib")
                               (string-append "--sysincludepaths="
                                              (assoc-ref %build-inputs "libc")
                                              "/include:"
                                              (assoc-ref %build-inputs
                                                         "linux-headers")
                                              "/include:{B}/include")
                               (string-append "--libpaths="
                                              (assoc-ref %build-inputs "libc")
                                              "/lib"))
       #:test-target "test"))
    (synopsis "Tiny and fast C compiler")
    (description
     "TCC, also referred to as \"TinyCC\", is a small and fast C compiler
written in C.  It supports ANSI C with GNU and extensions and most of the C99
standard.")
    (home-page "http://www.tinycc.org/")
    (license license:lgpl2.1+)))

(define-public tcc-wrapper
  (package
    (inherit tcc)
    (name "tcc-wrapper")
    (build-system trivial-build-system)
    (native-inputs '())
    (inputs `(("tcc" ,tcc)
              ("guile" ,guile-2.0)))

    ;; By default TCC does not honor any search path environment variable.
    ;; This wrapper adds them.
    ;;
    ;; FIXME: TCC includes its own linker so our 'ld-wrapper' hack to set the
    ;; RUNPATH is ineffective here.  We should modify TCC itself.
    (native-search-paths
     (list (search-path-specification
            (variable "TCC_CPATH")
            (files '("include")))
           (search-path-specification
            (variable "TCC_LIBRARY_PATH")
            (files '("lib" "lib64")))))

    (arguments
     '(#:builder
       (let* ((out   (assoc-ref %outputs "out"))
              (bin   (string-append out "/bin"))
              (tcc   (assoc-ref %build-inputs "tcc"))
              (guile (assoc-ref %build-inputs "guile")))
         (mkdir out)
         (mkdir bin)
         (call-with-output-file (string-append bin "/cc")
           (lambda (port)
             (format port "#!~a/bin/guile --no-auto-compile~%!#~%" guile)
             (write
              `(begin
                 (use-modules (ice-9 match)
                              (srfi srfi-26))

                 (define (split path)
                   (string-tokenize path (char-set-complement
                                          (char-set #\:))))

                 (apply execl ,(string-append tcc "/bin/tcc")
                        ,(string-append tcc "/bin/tcc") ;argv[0]
                        (append (cdr (command-line))
                                (match (getenv "TCC_CPATH")
                                  (#f '())
                                  (str
                                   (map (cut string-append "-I" <>)
                                        (split str))))
                                (match (getenv "TCC_LIBRARY_PATH")
                                  (#f '())
                                  (str
                                   (map (cut string-append "-L" <>)
                                        (split str)))))))
              port)
             (chmod port #o777)))
         #t)))
    (synopsis "Wrapper providing the 'cc' command for TCC")))
lookup))
+
+(define (args-fold args options unrecognized-option-proc
+ operand-proc . seeds)
+ "Answer the results of folding SEEDS as multiple values against the
+program-arguments in ARGS, as decided by the OPTIONS'
+`option-processor's, UNRECOGNIZED-OPTION-PROC, and OPERAND-PROC."
+ (let ((lookup (build-options-lookup options)))
+ ;; I don't like Guile's `error' here
+ (define (error msg . args)
+ (scm-error 'misc-error "args-fold" msg args #f))
+
+ (define (mutate-seeds! procedure . params)
+ (set! seeds (call-with-values
+ (lambda ()
+ (apply procedure (append params seeds)))
+ list)))
+
+ ;; Clean up the rest of ARGS, assuming they're all operands.
+ (define (rest-operands)
+ (for-each (lambda (arg) (mutate-seeds! operand-proc arg))
+ args)
+ (set! args '()))
+
+ ;; Call OPT's processor with OPT, NAME, an argument to be decided,
+ ;; and the seeds. Depending on OPT's *-arg? specification, get
+ ;; the parameter by calling REQ-ARG-PROC or OPT-ARG-PROC thunks;
+ ;; if no argument is allowed, call NO-ARG-PROC thunk.
+ (define (invoke-option-processor
+ opt name req-arg-proc opt-arg-proc no-arg-proc)
+ (mutate-seeds!
+ (option-processor opt) opt name
+ (cond ((option-required-arg? opt) (req-arg-proc))
+ ((option-optional-arg? opt) (opt-arg-proc))
+ (else (no-arg-proc) #f))))
+
+ ;; Compute and answer a short option argument, advancing ARGS as
+ ;; necessary, for the short option whose character is at POSITION
+ ;; in the current ARG.
+ (define (short-option-argument position)
+ (cond ((< (1+ position) (string-length (car args)))
+ (let ((result (substring (car args) (1+ position))))
+ (set! args (cdr args))
+ result))
+ ((pair? (cdr args))
+ (let ((result (cadr args)))
+ (set! args (cddr args))
+ result))
+ ((pair? args)
+ (set! args (cdr args))
+ #f)
+ (else #f)))
+
+ ;; Interpret the short-option at index POSITION in (car ARGS),
+ ;; followed by the remaining short options in (car ARGS).
+ (define (short-option position)
+ (if (>= position (string-length (car args)))
+ (begin
+ (set! args (cdr args))
+ (next-arg))
+ (let* ((opt-name (string-ref (car args) position))
+ (option-here (hash-ref lookup opt-name)))
+ (cond ((not option-here)
+ (mutate-seeds! unrecognized-option-proc
+ (option (list opt-name) #f #f
+ unrecognized-option-proc)
+ opt-name #f)
+ (short-option (1+ position)))
+ (else
+ (invoke-option-processor
+ option-here opt-name
+ (lambda ()
+ (or (short-option-argument position)
+ (error "Missing required argument after `-~A'" opt-name)))
+ (lambda ()
+ ;; edge case: -xo -zf or -xo -- where opt-name=#\o
+ ;; GNU getopt_long resolves these like I do
+ (short-option-argument position))
+ (lambda () #f))
+ (if (not (or (option-required-arg? option-here)
+ (option-optional-arg? option-here)))
+ (short-option (1+ position))))))))
+
+ ;; Process the long option in (car ARGS). We make the
+ ;; interesting, possibly non-standard assumption that long option
+ ;; names might contain #\=, so keep looking for more #\= in (car
+ ;; ARGS) until we find a named option in lookup.
+ (define (long-option)
+ (let ((arg (car args)))
+ (let place-=-after ((start-pos 2))
+ (let* ((index (string-index arg #\= start-pos))
+ (opt-name (substring arg 2 (or index (string-length arg))))
+ (option-here (hash-ref lookup opt-name)))
+ (if (not option-here)
+ ;; look for a later #\=, unless there can't be one
+ (if index
+ (place-=-after (1+ index))
+ (mutate-seeds!
+ unrecognized-option-proc
+ (option (list opt-name) #f #f unrecognized-option-proc)
+ opt-name #f))
+ (invoke-option-processor
+ option-here opt-name
+ (lambda ()
+ (if index
+ (substring arg (1+ index))
+ (error "Missing required argument after `--~A'" opt-name)))
+ (lambda () (and index (substring arg (1+ index))))
+ (lambda ()
+ (if index
+ (error "Extraneous argument after `--~A'" opt-name))))))))
+ (set! args (cdr args)))
+
+ ;; Process the remaining in ARGS. Basically like calling
+ ;; `args-fold', but without having to regenerate `lookup' and the
+ ;; funcs above.
+ (define (next-arg)
+ (if (null? args)
+ (apply values seeds)
+ (let ((arg (car args)))
+ (cond ((or (not (char=? #\- (string-ref arg 0)))
+ (= 1 (string-length arg))) ;"-"
+ (mutate-seeds! operand-proc arg)
+ (set! args (cdr args)))
+ ((char=? #\- (string-ref arg 1))
+ (if (= 2 (string-length arg)) ;"--"
+ (begin (set! args (cdr args)) (rest-operands))
+ (long-option)))
+ (else (short-option 1)))
+ (next-arg))))
+
+ (next-arg)))
+
+;;; srfi-37.scm ends here