;;;
;;; gauche.cgen.standalone - Create standalone binary
;;;
    Copyright ( c ) 2014 - 2022       <  >
;;;
;;;   Redistribution and use in source and binary forms, with or without
;;;   modification, are permitted provided that the following conditions
;;;   are met:
;;;
;;;   1. Redistributions of source code must retain the above copyright
;;;      notice, this list of conditions and the following disclaimer.
;;;
;;;   2. Redistributions in binary form must reproduce the above copyright
;;;      notice, this list of conditions and the following disclaimer in the
;;;      documentation and/or other materials provided with the distribution.
;;;
;;;   3. Neither the name of the authors nor the names of its contributors
;;;      may be used to endorse or promote products derived from this
;;;      software without specific prior written permission.
;;;
;;;   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    " AS IS " AND ANY EXPRESS OR IMPLIED WARRANTIES , INCLUDING , BUT NOT
;;;   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;;;   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;;;   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    SPECIAL , EXEMPLARY , OR CONSEQUENTIAL DAMAGES ( INCLUDING , BUT NOT LIMITED
;;;   TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
;;;   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
    LIABILITY , WHETHER IN CONTRACT , STRICT LIABILITY , OR TORT ( INCLUDING
;;;   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;;   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;

(define-module gauche.cgen.standalone
  (use gauche.cgen)
  (use gauche.config)
  (use gauche.process)
  (use srfi.13)
  (use srfi.42)
  (use file.util)
  (export build-standalone)
  )
(select-module gauche.cgen.standalone)

(define (build-standalone srcfile :key (outfile #f)
                                       (extra-files '())
                                       (include-dirs '())
                                       (cpp-definitions '())
                                       (keep-c-file #f)
                                       (header-dirs '())
                                       (library-dirs '()))
  (receive (placeholder out.c)
      (generate-c-file srcfile (append include-dirs '(".")) extra-files)
    (unwind-protect
        (compile-c-file out.c
                        (or outfile (path-sans-extension (sys-basename srcfile)))
                        (map (^d #"-D\"~|d|\"") cpp-definitions)
                        (map (^d #"-I\"~|d|\"") header-dirs)
                        (map (^d #"-L\"~|d|\"") library-dirs))
      (unless keep-c-file (sys-unlink out.c))
      (sys-unlink placeholder))))

;; This creates an empty file that reserve the temporary name, and the actual
  C file .   Returns two names .
(define (generate-c-file file incdirs extras)
  (define outname
    (receive (oport name) (sys-mkstemp (path-sans-extension (sys-basename file)))
      (close-port oport)
      name))
  (parameterize ([cgen-current-unit
                  (make <cgen-unit>
                    :name outname
                    :preamble "/* Generated by build-standalone */"
                    :init-prologue "int main (int argc, const char *argv[]) {"
                    :init-epilogue "}")])
    (cgen-decl "#include <gauche/static.h>"
               "#include <gauche.h>")
    (cgen-decl (format "const char *main_script = ~a;"
                       (cgen-safe-string (file->string file))))
    (cgen-init "SCM_INIT_STATIC();")
    (unless (null? extras)
      (setup-library-table incdirs extras))
    (cgen-init "Scm_SimpleMain(argc, argv, main_script, 0);")
    (cgen-emit-c (cgen-current-unit)))
  (values outname (path-swap-extension outname "c")))

(define (setup-library-table incdirs extras)
  (define setup-code
    `(let1 tab (make-hash-table 'equal?)
       ,@(list-ec
          [: x extras]
          (if-let1 f (find-file-in-paths x :paths incdirs :pred file-exists?)
            `(hash-table-put! tab ,x ,(file->string f))
            (error "Can't find library file:" x)))
       (add-embedded-code-loader! tab)))
  (cgen-decl (format "const char *setup_libraries = ~a;"
                     (cgen-safe-string (write-to-string setup-code))))
  (cgen-init "Scm_EvalCString(setup_libraries, SCM_OBJ(Scm_GaucheModule()),"
             "                NULL);"))

(define (get-libs xdefs)
  (let* ([libs (gauche-config "--static-libs")]
         [libs (if (any #/^-D(=|\s*)\"?GAUCHE_STATIC_EXCLUDE_GDBM\"?/ xdefs)
                 (regexp-replace-all #/-lgdbm(_compat)?/ libs "")
                 libs)]
         [libs (if (any #/^-D(=|\s*)\"?GAUCHE_STATIC_EXCLUDE_MBEDTLS\"?/ xdefs)
                 (regexp-replace-all #/-lmbed\w*/ libs "")
                 libs)])
    libs))

   's ld does n't like that nonexistent directory is given to
;; -L flag.  The warning message is annoying, so we filter out such flags.
(define (exclude-nonexistent-dirs dir-flags)
  (define (existing-dir? flag)
    (if-let1 m (#/^-[IL]/ flag)
      (and (file-exists? (rxmatch-after m)) flag)
      flag))
  ($ string-join
     (filter-map existing-dir? (shell-tokenize-string dir-flags))
     " "))

(define (compile-c-file c-file outfile xdefs xincdirs xlibdirs)
  ;; TODO: We wish we could use gauche.package.compile, but currently it is
  ;; specialized to compile extension modules.  Eventually we will modify
  the module so that this function can be just a one - liner
  (let ([cc (gauche-config "--cc")]
        [cflags (gauche-config "--so-cflags")]
        [defs    (string-join xdefs " ")]
        [incdirs (exclude-nonexistent-dirs
                  (string-join `(,@xincdirs ,(gauche-config "-I")) " "))]
        [libdirs (exclude-nonexistent-dirs
                  (string-join `(,@xlibdirs ,(gauche-config "-L")) " "))]
        [libs    (get-libs xdefs)])
    (let1 cmd #"~cc ~cflags ~defs ~incdirs -o ~outfile ~c-file ~libdirs ~libs"
      (print cmd)
      (sys-system cmd))))


 gauche.cgen.standalone - Create standalone binary


   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   1. Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.

   2. Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.

   3. Neither the name of the authors nor the names of its contributors
      may be used to endorse or promote products derived from this
      software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 This creates an empty file that reserve the temporary name, and the actual
 -L flag.  The warning message is annoying, so we filter out such flags.
 TODO: We wish we could use gauche.package.compile, but currently it is
 specialized to compile extension modules.  Eventually we will modify
    Copyright ( c ) 2014 - 2022       <  >
    " AS IS " AND ANY EXPRESS OR IMPLIED WARRANTIES , INCLUDING , BUT NOT
    SPECIAL , EXEMPLARY , OR CONSEQUENTIAL DAMAGES ( INCLUDING , BUT NOT LIMITED
    LIABILITY , WHETHER IN CONTRACT , STRICT LIABILITY , OR TORT ( INCLUDING

(define-module gauche.cgen.standalone
  (use gauche.cgen)
  (use gauche.config)
  (use gauche.process)
  (use srfi.13)
  (use srfi.42)
  (use file.util)
  (export build-standalone)
  )
(select-module gauche.cgen.standalone)

(define (build-standalone srcfile :key (outfile #f)
                                       (extra-files '())
                                       (include-dirs '())
                                       (cpp-definitions '())
                                       (keep-c-file #f)
                                       (header-dirs '())
                                       (library-dirs '()))
  (receive (placeholder out.c)
      (generate-c-file srcfile (append include-dirs '(".")) extra-files)
    (unwind-protect
        (compile-c-file out.c
                        (or outfile (path-sans-extension (sys-basename srcfile)))
                        (map (^d #"-D\"~|d|\"") cpp-definitions)
                        (map (^d #"-I\"~|d|\"") header-dirs)
                        (map (^d #"-L\"~|d|\"") library-dirs))
      (unless keep-c-file (sys-unlink out.c))
      (sys-unlink placeholder))))

  C file .   Returns two names .
(define (generate-c-file file incdirs extras)
  (define outname
    (receive (oport name) (sys-mkstemp (path-sans-extension (sys-basename file)))
      (close-port oport)
      name))
  (parameterize ([cgen-current-unit
                  (make <cgen-unit>
                    :name outname
                    :preamble "/* Generated by build-standalone */"
                    :init-prologue "int main (int argc, const char *argv[]) {"
                    :init-epilogue "}")])
    (cgen-decl "#include <gauche/static.h>"
               "#include <gauche.h>")
    (cgen-decl (format "const char *main_script = ~a;"
                       (cgen-safe-string (file->string file))))
    (cgen-init "SCM_INIT_STATIC();")
    (unless (null? extras)
      (setup-library-table incdirs extras))
    (cgen-init "Scm_SimpleMain(argc, argv, main_script, 0);")
    (cgen-emit-c (cgen-current-unit)))
  (values outname (path-swap-extension outname "c")))

(define (setup-library-table incdirs extras)
  (define setup-code
    `(let1 tab (make-hash-table 'equal?)
       ,@(list-ec
          [: x extras]
          (if-let1 f (find-file-in-paths x :paths incdirs :pred file-exists?)
            `(hash-table-put! tab ,x ,(file->string f))
            (error "Can't find library file:" x)))
       (add-embedded-code-loader! tab)))
  (cgen-decl (format "const char *setup_libraries = ~a;"
                     (cgen-safe-string (write-to-string setup-code))))
  (cgen-init "Scm_EvalCString(setup_libraries, SCM_OBJ(Scm_GaucheModule()),"
             "                NULL);"))

(define (get-libs xdefs)
  (let* ([libs (gauche-config "--static-libs")]
         [libs (if (any #/^-D(=|\s*)\"?GAUCHE_STATIC_EXCLUDE_GDBM\"?/ xdefs)
                 (regexp-replace-all #/-lgdbm(_compat)?/ libs "")
                 libs)]
         [libs (if (any #/^-D(=|\s*)\"?GAUCHE_STATIC_EXCLUDE_MBEDTLS\"?/ xdefs)
                 (regexp-replace-all #/-lmbed\w*/ libs "")
                 libs)])
    libs))

   's ld does n't like that nonexistent directory is given to
(define (exclude-nonexistent-dirs dir-flags)
  (define (existing-dir? flag)
    (if-let1 m (#/^-[IL]/ flag)
      (and (file-exists? (rxmatch-after m)) flag)
      flag))
  ($ string-join
     (filter-map existing-dir? (shell-tokenize-string dir-flags))
     " "))

(define (compile-c-file c-file outfile xdefs xincdirs xlibdirs)
  the module so that this function can be just a one - liner
  (let ([cc (gauche-config "--cc")]
        [cflags (gauche-config "--so-cflags")]
        [defs    (string-join xdefs " ")]
        [incdirs (exclude-nonexistent-dirs
                  (string-join `(,@xincdirs ,(gauche-config "-I")) " "))]
        [libdirs (exclude-nonexistent-dirs
                  (string-join `(,@xlibdirs ,(gauche-config "-L")) " "))]
        [libs    (get-libs xdefs)])
    (let1 cmd #"~cc ~cflags ~defs ~incdirs -o ~outfile ~c-file ~libdirs ~libs"
      (print cmd)
      (sys-system cmd))))
