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;;; GNU Guix --- Functional package management for GNU
;;; Copyright � 2016 Steve Sprang <scs@stevesprang.com>
;;; Copyright � 2016 Leo Famulari <leo@famulari.name>
;;;
;;; 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 (gn packages erlang)
  #: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 base)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages ncurses)
  #:use-module (gnu packages perl)
  #:use-module (gnu packages tls))

(define-public erlang
  ;; Keep in sync with 'erlang-manpages'!
  (package
    (name "erlang")
    (version "18.3")
    (source (origin
              (method url-fetch)
              (uri (string-append
                    "http://erlang.org/download/otp_src_"
                    version
                    ".tar.gz"))
              (sha256
               (base32
                "1hy9slq9gjvwdb504dmvp6rax90isnky6chqkyq5v4ybl4lq3azx"))))
    (build-system gnu-build-system)
    (native-inputs
     `(("perl" ,perl)))
    (inputs
     `(("ncurses" ,ncurses)
       ("openssl" ,openssl)))
    (arguments
     `(#:configure-flags
       (list (string-append "--with-ssl=" (assoc-ref %build-inputs "openssl")))
       #:phases
       (modify-phases %standard-phases
	 (add-after 'patch-source-shebangs 'patch-source-env
	   (lambda _
	     (let ((escripts
		    (append
		     (find-files "." "\\.escript")
		     (find-files "lib/stdlib/test/escript_SUITE_data/")
		     '("erts/lib_src/utils/make_atomics_api"
		       "erts/preloaded/src/add_abstract_code"
		       "lib/diameter/bin/diameterc"
		       "lib/reltool/examples/display_args"
		       "lib/reltool/examples/mnesia_core_dump_viewer"
		       "lib/snmp/src/compile/snmpc.src"
		       "make/verify_runtime_dependencies"
		       "make/emd2exml.in"))))
	       (substitute* escripts
		 (("/usr/bin/env") (which "env"))))))
         (add-after 'unpack 'path-to-rm
           (lambda _
             (substitute* "erts/configure"
               (("/bin/rm") (which "rm")))
             (substitute* "lib/odbc/configure"
               (("/bin/rm") (which "rm")))))
         (add-before 'configure 'set-erl-top
           (lambda _
             (setenv "ERL_TOP" (getcwd))))
         (add-after 'install 'patch-erl
           ;; This only works after install.
           (lambda _
             (substitute* (string-append (assoc-ref %outputs "out") "/bin/erl")
               (("sed") (which "sed"))))))
       #:test-target "release_tests"))
    (home-page "http://erlang.org/")
    (synopsis "The Erlang programming language")
    (description
     "Erlang is a programming language used to build massively
scalable soft real-time systems with requirements on high
availability.  Some of its uses are in telecoms, banking, e-commerce,
computer telephony and instant messaging.  Erlang's runtime system has
built-in support for concurrency, distribution and fault tolerance.")
    (license license:asl2.0)))

(define-public erlang-manpages
  ;; Keep in sync with 'erlang'!
  (package
    (name "erlang-manpages")
    (version (package-version erlang))
    (source (origin
              (method url-fetch)
              (uri (string-append "http://erlang.org/download/otp_doc_man_"
                                  version ".tar.gz"))
              (sha256
               (base32
                "1hpcr7a3dx2y9gnb53bvb4g6lyvbwigadl9s3f978s01x40f32wp"))))
    (build-system trivial-build-system)
    (arguments
     '(#:modules ((guix build utils))
       #:builder
       (begin
         (use-modules (guix build utils))
         (let* ((gz  (assoc-ref %build-inputs "gzip"))
                (tar (assoc-ref %build-inputs "tar"))
                (out (assoc-ref %outputs "out"))
                (man (string-append out "/share/man")))
           (setenv "PATH" (string-append tar "/bin:" gz "/bin"))
           (mkdir-p man)
           (with-directory-excursion man
             (zero? (system* "tar" "xvf"
                             (assoc-ref %build-inputs "source"))))
           (delete-file (string-append man "/PR.template"))
           (delete-file (string-append man "/README"))))))
    (native-inputs `(("tar" ,tar)
                     ("gzip" ,gzip)))
    (synopsis "Man pages of Erlang")
    (description "This provides the man pages of Erlang.")
    (home-page (package-home-page erlang))
    (license license:asl2.0)))