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call any
function specified by a call interface description at run-time.

FFI stands for Foreign Function Interface.  A foreign function interface is
the popular name for the interface that allows code written in one language
to call code written in another language.  The libffi library really only
provides the lowest, machine dependent layer of a fully featured foreign
function interface.  A layer must exist above libffi that handles type
conversions for values passed between the two languages.")
    (home-page "http://sources.redhat.com/libffi/")

    ;; See <https://github.com/atgreen/libffi/blob/master/LICENSE>.
    (license expat)))

(define-public python-cffi
  (package
    (name "python-cffi")
    (version "1.14.0")
    (source
     (origin
      (method url-fetch)
      (uri (pypi-uri "cffi" version))
      (sha256
       (base32 "1dn279gw5ql8i5n3s5v4rnv96rhhjjfn7xq729qbl5bs2954yf1d"))))
    (build-system python-build-system)
    (inputs
     `(("libffi" ,libffi)))
    (propagated-inputs ; required at run-time
     `(("python-pycparser" ,python-pycparser)))
    (native-inputs
     `(("pkg-config" ,pkg-config)
       ("python-pytest" ,python-pytest)))
    (arguments
     `(#:modules ((ice-9 ftw)
                  (srfi srfi-26)
                  (guix build utils)
                  (guix build python-build-system))
       #:phases
       (modify-phases %standard-phases
         (replace 'check
           (lambda _
             (setenv "PYTHONPATH"
                     (string-append
                      (getenv "PYTHONPATH")
                      ":" (getcwd) "/build/"
                      (car (scandir "build" (cut string-prefix? "lib." <>)))))

             ;; XXX The "normal" approach of setting CC and friends does
             ;; not work here.  Is this the correct way of doing things?
             (substitute* "testing/embedding/test_basic.py"
               (("c = distutils\\.ccompiler\\.new_compiler\\(\\)")
                (string-append "c = distutils.ccompiler.new_compiler();"
                               "c.set_executables(compiler='gcc',"
                               "compiler_so='gcc',linker_exe='gcc',"
                               "linker_so='gcc -shared')")))
             (substitute* "testing/cffi0/test_ownlib.py"
               (("\"cc testownlib") "\"gcc testownlib"))
             (invoke "py.test" "-v" "c/" "testing/")
             #t))
         (add-before 'check 'patch-paths-of-dynamically-loaded-libraries
           (lambda* (#:key inputs #:allow-other-keys)
             ;; Shared libraries should be referred by their absolute path as
             ;; using find_library or the like with their name fail when the
             ;; resolved .so object is a linker script rather than an ELF
             ;; binary (this is a limitation of the ctype library of Python).
             (let* ((glibc (assoc-ref inputs "libc"))
                    (libm (string-append glibc "/lib/libm.so.6"))
                    (libc (string-append glibc "/lib/libc.so.6")))
               (substitute* '("testing/cffi0/test_function.py"
                              "testing/cffi0/test_parsing.py"
                              "testing/cffi0/test_unicode_literals.py"
                              "testing/cffi0/test_zdistutils.py"
                              "testing/cffi1/test_recompiler.py")
                 (("lib_m = ['\"]{1}m['\"]{1}")
                  (format #f "lib_m = '~a'" libm)))
               (substitute* '("testing/cffi0/test_verify.py"
                              "testing/cffi1/test_verify1.py")
                 (("lib_m = \\[['\"]{1}m['\"]{1}\\]")
                  (format #f "lib_m = ['~a']" libm)))
               (substitute* "c/test_c.py"
                 (("find_and_load_library\\(['\"]{1}c['\"]{1}")
                  (format #f "find_and_load_library('~a'" libc)))
               #t))))))
    (home-page "https://cffi.readthedocs.io/")
    (synopsis "Foreign function interface for Python")
    (description "Foreign Function Interface for Python calling C code.")
    (license expat)))

(define-public python2-cffi
  (package-with-python2 python-cffi))

(define-public python-cffi-documentation
  (package
    (name "python-cffi-documentation")
    (version (package-version python-cffi))
    (source (package-source python-cffi))
    (build-system gnu-build-system)
    (arguments
     `(#:tests? #f
       #:phases (modify-phases %standard-phases
                  (add-after 'unpack 'chdir
                    (lambda _ (chdir "doc") #t))
                  (delete 'configure)
                  (replace 'build
                    (lambda* (#:key (make-flags '()) #:allow-other-keys)
                      (apply invoke "make" "html" make-flags)))
                  (replace 'install
                    (lambda* (#:key outputs #:allow-other-keys)
                      (let ((out (assoc-ref outputs "out")))
                        (copy-recursively "build/html" (string-append out "/html"))
                        #t))))))
    (native-inputs
     `(("sphinx-build" ,python-sphinx)))
    (home-page (package-home-page python-cffi))
    (synopsis "Documentation for the Python CFFI interface")
    (description
     "This package contains HTML documentation for the @code{python-cffi}
project.")
    (license (package-license python-cffi))))

(define-public ruby-ffi
  (package
    (name "ruby-ffi")
    (version "1.12.2")
    (source (origin
              ;; Pull from git because the RubyGems release bundles LibFFI,
              ;; and comes with a gemspec that makes it difficult to unbundle.
              (method git-fetch)
              (uri (git-reference
                    (url "https://github.com/ffi/ffi")
                    (commit version)))
              (file-name (git-file-name name version))
              (sha256
               (base32
                "1cvqsbjr2gfjgqggq9kdx90qhhzr7qkyr9wmxdsfsik6cnxnnpmd"))))
    (build-system ruby-build-system)
    (arguments
     `(#:phases
       (modify-phases %standard-phases
         (add-after 'unpack 'do-not-depend-on-ccache
           (lambda _
             (substitute* "spec/ffi/fixtures/GNUmakefile"
               (("^CCACHE := .*")
                ""))
             #t))
         (replace 'replace-git-ls-files
           (lambda _
             ;; Do not try to execute git, or include the (un)bundled LibFFI.
             (substitute* "ffi.gemspec"
               (("git ls-files -z")
                "find * -type f -print0 | sort -z")
               (("lfs \\+?= .*")
                "lfs = []\n"))
             (substitute* "Rakefile"
               (("LIBFFI_GIT_FILES = .*")
                "LIBFFI_GIT_FILES = []\n"))
             #t))
         (replace 'build
          (lambda _
            ;; Tests depend on the native extensions, so we build it
            ;; beforehand without going through the gem machinery.
             (invoke "rake" "compile")

             ;; XXX: Ideally we'd use "rake native gem" here to prevent the
             ;; install phase from needlessly rebuilding everything, but that
             ;; requires the bundled LibFFI, and the install phase can not
             ;; deal with such gems anyway.
             (invoke "gem" "build" "ffi.gemspec")))
         (replace 'check
           (lambda* (#:key tests? #:allow-other-keys)
             (if tests?
                 (begin
                   (setenv "MAKE" "make")
                   (setenv "CC" "gcc")
                   (invoke "rspec" "spec"))
                 (format #t "test suite not run~%"))
             #t)))))
    (native-inputs
     `(("ruby-rake-compiler" ,ruby-rake-compiler)
       ("ruby-rspec" ,ruby-rspec)
       ("ruby-rubygems-tasks" ,ruby-rubygems-tasks)))
    (inputs
     `(("libffi" ,libffi)))
    (synopsis "Ruby foreign function interface library")
    (description "Ruby-FFI is a Ruby extension for programmatically loading
dynamic libraries, binding functions within them, and calling those functions
from Ruby code.  Moreover, a Ruby-FFI extension works without changes on Ruby
and JRuby.")
    (home-page "https://wiki.github.com/ffi/ffi")
    (license bsd-3)))