;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Steve Sprang <scs@stevesprang.com>
;;; Copyright © 2016 Leo Famulari <leo@famulari.name>
;;; Copyright © 2016, 2017 Pjotr Prins <pjotr.guix@thebird.nl>
;;;
;;; 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 erlang)
  #:use-module ((guix licenses) #:prefix license:)
  #:use-module (guix build-system gnu)
  #:use-module (guix download)
  #:use-module (guix packages)
  #:use-module (gnu packages)
  #:use-module (gnu packages autotools)
  #:use-module (gnu packages fontutils)
  #:use-module (gnu packages gl)
  #:use-module (gnu packages ncurses)
  #:use-module (gnu packages perl)
  #:use-module (gnu packages tls)
  #:use-module (gnu packages wxwidgets))

(define-public erlang
  (package
    (name "erlang")
    (version "20.0")
    (source (origin
              (method url-fetch)
              ;; The tarball from http://erlang.org/download contains many
              ;; pre-compiled files, so we use this snapshot of the source
              ;; repository.
              (uri (string-append "https://github.com/erlang/otp/archive/OTP-"
                                  version ".tar.gz"))
              (file-name (string-append name "-" version ".tar.gz"))
              (sha256
               (base32
                "1azjjyb743i6vjq7rnh5qnslsqg0x60a9zrlhg9n3dpm13z1b22l"))
              (patches (search-patches "erlang-man-path.patch"))))
    (build-system gnu-build-system)
    (native-inputs
     `(("perl" ,perl)
       ("autoconf" ,autoconf)
       ("automake" ,automake)

       ;; Erlang's documentation is distributed in a separate tarball.
       ("erlang-manpages"
        ,(origin
           (method url-fetch)
           (uri (string-append "http://erlang.org/download/otp_doc_man_"
                               version ".tar.gz"))
           (sha256
            (base32
             "1k25p37w1l1j20qd8rga4j4q7s7r0rbsi02x3xwzhw51jhm59wdp"))))))
    (inputs
     `(("ncurses" ,ncurses)
       ("openssl" ,openssl)
       ("wxwidgets" ,wxwidgets)))
    (propagated-inputs
     `(("fontconfig" ,fontconfig)
       ("glu" ,glu)
       ("mesa" ,mesa)))
    (arguments
     `(#:test-target "release_tests"
       #:configure-flags
       (list "--disable-saved-compile-time"
             "--enable-dynamic-ssl-lib"
             "--enable-native-libs"
             "--enable-shared-zlib"
             "--enable-smp-support"
             "--enable-threads"
             "--enable-wx"
             (string-append "--with-ssl=" (assoc-ref %build-inputs "openssl")))
       #:modules ((srfi srfi-19) ; make-time, et cetera.
                  (guix build utils)
                  (guix build gnu-build-system))
       #:phases
       (modify-phases %standard-phases
         ;; The are several code fragments that embed timestamps into the
         ;; output. Here, we alter those fragments to use the value of
         ;; SOURCE_DATE_EPOCH instead.
         (add-after 'unpack 'remove-timestamps
           (lambda _
             (let ((source-date-epoch
                     (time-utc->date
                       (make-time time-utc 0 (string->number
                                               (getenv "SOURCE_DATE_EPOCH"))))))
               (substitute* "lib/reltool/src/reltool_target.erl"
                 (("Date = date\\(\\),")
                  (string-append "Date = "
                                 (date->string source-date-epoch
                                               "'{~Y,~m,~d}',"))))
               (substitute* "lib/reltool/src/reltool_target.erl"
                 (("Time = time\\(\\),")
                  (string-append "Time = "
                                 (date->string source-date-epoch
                                               "'{~H,~M,~S}',"))))
               (substitute* '("lib/reltool/src/reltool_target.erl"
                              "lib/sasl/src/systools_make.erl")
                 (("date\\(\\), time\\(\\),")
                  (date->string source-date-epoch
                                "{~Y,~m,~d}, {~H,~M,~S},")))
               (substitute* "lib/dialyzer/test/small_SUITE_data/src/gs_make.erl"
                 (("tuple_to_list\\(date\\(\\)\\),tuple_to_list\\(time\\(\\)\\)")
                  (date->string
                    source-date-epoch
                    "tuple_to_list({~Y,~m,~d}), tuple_to_list({~H,~M,~S})")))
               (substitute* "lib/snmp/src/compile/snmpc_mib_to_hrl.erl"
                 (("\\{Y,Mo,D\\} = date\\(\\),")
                  (date->string source-date-epoch
                                "{Y,Mo,D} = {~Y,~m,~d},")))
               (substitute* "lib/snmp/src/compile/snmpc_mib_to_hrl.erl"
                 (("\\{H,Mi,S\\} = time\\(\\),")
                  (date->string source-date-epoch
                                "{H,Mi,S} = {~H,~M,~S},"))))))
         (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-before 'configure 'set-erl-top
           (lambda _
             (setenv "ERL_TOP" (getcwd))))
         (add-before 'configure 'autoconf
           (lambda _ (zero? (system* "./otp_build" "autoconf"))))
         (add-after 'install 'patch-erl
           ;; This only works after install.
           (lambda _
             (substitute* (string-append (assoc-ref %outputs "out") "/bin/erl")
               (("sed") (which "sed")))))
         (add-after 'install 'install-doc
           (lambda* (#:key inputs outputs #:allow-other-keys)
             (let* ((out (assoc-ref outputs "out"))
                    (manpages (assoc-ref inputs "erlang-manpages"))
                    (share (string-append out "/share/")))
             (mkdir-p share)
             (mkdir-p (string-append share "/misc/erlang"))
             (with-directory-excursion share
               (and
                 (zero? (system* "tar" "xvf" manpages))
                 (rename-file "COPYRIGHT"
                              (string-append share "/misc/erlang/COPYRIGHT"))
                 ;; Delete superfluous file.
                 (delete-file "PR.template")))))))))
    (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.")
    ;; Erlang is distributed under the Apache License 2.0, but some components
    ;; have other licenses. See 'system/COPYRIGHT' in the source distribution.
    (license (list license:asl2.0 license:bsd-2 license:bsd-3 license:expat
                   license:lgpl2.0+ license:tcl/tk license:zlib))))
