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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Leo Famulari <leo@famulari.name>
;;; Copyright © 2016, 2017 Pjotr Prins <pjotr.guix@thebird.nl>
;;; Copyright © 2016 Ricardo Wurmus <rekado@elephly.net>
;;; Copyright © 2017 nee <nee.git@cock.li>
;;; Copyright © 2018, 2019, 2021 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2018 Nikita <nikita@n0.is>
;;; Copyright © 2021 Oskar Köök <oskar@maatriks.ee>
;;; Copyright © 2021 Cees de Groot <cg@evrl.com>
;;; Copyright © 2024 Andrew Tropin <andrew@trop.in>
;;; Copyright © 2024 Ivan Sokolov <ivan-p-sokolov@ya.ru>
;;; Copyright © 2024 Igor Goryachev <igor@goryachev.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 elixir)
  #:use-module ((guix licenses) #:prefix license:)
  #:use-module (guix build-system gnu)
  #:use-module (guix gexp)
  #:use-module (guix utils)
  #:use-module (guix git-download)
  #:use-module (guix packages)
  #:use-module (gnu packages)
  #:use-module (gnu packages bash)
  #:use-module (gnu packages erlang)
  #:use-module (gnu packages version-control))

(define-public elixir
  (package
    (name "elixir")
    (version "1.17.2")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url "https://github.com/elixir-lang/elixir")
             (commit (string-append "v" version))))
       (file-name (git-file-name name version))
       (sha256
        (base32 "063pfz6ljy22b4nyvk8pi8ggqb6nmzqcca08vnl3h9xgh1zzddpj"))
       (patches (search-patches "elixir-path-length.patch"))))
    (build-system gnu-build-system)
    (arguments
     (list
      #:test-target "test"
      #:parallel-tests? #f ;see <https://debbugs.gnu.org/cgi/bugreport.cgi?bug=32171#23>
      #:make-flags #~(list (string-append "PREFIX=" #$output))
      #:phases
      #~(let* ((compiler-path "lib/elixir/src/elixir_erl_compiler.erl")
               (compiler-path-orig (string-append compiler-path ".orig")))
          (modify-phases %standard-phases
            (add-after 'unpack 'make-git-checkout-writable
              (lambda _
                (for-each make-file-writable (find-files "."))))
            (add-after 'make-git-checkout-writable 'replace-paths
              (lambda* (#:key inputs #:allow-other-keys)
                ;; Note: references end up obfuscated in binary BEAM files
                ;; where they may be invisible to the GC and graft code:
                ;; <https://issues.guix.gnu.org/54304#11>.
                (substitute* '("lib/mix/lib/mix/release.ex"
                               "lib/mix/lib/mix/tasks/release.init.ex")
                  (("#!/bin/sh")
                   (string-append "#!" (search-input-file inputs "/bin/sh"))))
                (substitute* "bin/elixir"
                  (("ERTS_BIN=\n")
                   (string-append
                    "ERTS_BIN="
                    ;; Elixir Releases will prepend to ERTS_BIN the path of
                    ;; a copy of erl.  We detect if a release is being
                    ;; generated by checking the initial ERTS_BIN value: if
                    ;; it's empty, we are not in release mode and can point
                    ;; to the actual erl binary in Guix store.
                    "\nif [ -z \"$ERTS_BIN\" ]; then ERTS_BIN="
                    (string-drop-right
                     (search-input-file inputs "/bin/erl") 3)
                    "; fi\n")))
                (substitute* "bin/mix"
                  (("#!/usr/bin/env elixir")
                   (string-append "#!" #$output "/bin/elixir")))))
            (add-after 'replace-paths 'pre-install-source
              (lambda* (#:key outputs #:allow-other-keys)
                (copy-recursively
                 "lib"
                 (string-append (assoc-ref outputs "src") "/source/lib"))))
            ;; Temporarily patch the compiler to place correct source
            ;; locations into module info instead of build directory.
            (add-after 'pre-install-source 'patch-elixir-compiler
              (lambda* (#:key outputs #:allow-other-keys)
                (copy-recursively compiler-path compiler-path-orig)
                (let ((source (string-append "/tmp/guix-build-" #$name "-"
                                             #$version ".drv-0"))
                      (destination (assoc-ref outputs "src")))
                  (substitute* compiler-path
                    (("source, Source")
                     (string-append "source, string:replace(Source, \""
                                    source "\", \"" destination "\")"))))))
            (add-before 'build 'make-current
              ;; The Elixir compiler checks whether or not to compile files
              ;; by inspecting their timestamps.  When the timestamp is
              ;; equal to the epoch no compilation will be performed.  Some
              ;; tests fail when files are older than Jan 1, 2000.
              (lambda _
                (for-each (lambda (file)
                            (let ((recent 1400000000))
                              (utime file recent recent 0 0)))
                          (find-files "." ".*"))))
            ;; Unpatch the compiler and recompile it.
            (add-after 'build 'restore-and-recompile
              (lambda _
                (copy-recursively compiler-path-orig compiler-path)
                (delete-file compiler-path-orig)
                (invoke "make")))
            (add-before 'check 'set-home
              (lambda* (#:key inputs #:allow-other-keys)
                ;; Some tests require access to a home directory.
                (setenv "HOME" "/tmp")))
            (delete 'configure)
            (add-after 'install 'wrap-programs
              (lambda* (#:key inputs outputs #:allow-other-keys)
                (let* ((out (assoc-ref outputs "out"))
                       (programs '("elixir" "elixirc" "iex")))
                  ;; mix can be sourced as an elixir script by other elixir
                  ;; program, for example `iex -S mix`, so we should not wrap
                  ;; mix into shell script.
                  (substitute* (string-append out "/bin/mix")
                    (("Mix.CLI.main\\(\\)")
                     (format #f "\
~~w[GUIX_ELIXIR_LIBS ERL_LIBS]
|> Enum.map(&System.get_env/1)
|> Enum.reject(&is_nil/1)
|> Enum.join(\":\")
|> case do \"\" -> :ok; erl_libs -> System.put_env(\"ERL_LIBS\", erl_libs) end
System.put_env(\"MIX_REBAR3\", System.get_env(\"MIX_REBAR3\", \"~a\"))
Mix.CLI.main()"
                             (search-input-file inputs "/bin/rebar3"))))
                  (for-each
                   (lambda (program)
                     (wrap-program (string-append out "/bin/" program)
                       '("ERL_LIBS" prefix ("${GUIX_ELIXIR_LIBS}"))))
                   programs))))))))
    (outputs '("out" "src"))
    (inputs (list bash-minimal erlang rebar3 git))
    (native-search-paths
     (list (search-path-specification
            (variable "GUIX_ELIXIR_LIBS")
            (files (list (string-append "lib/elixir/" (version-major+minor
                                                       version)))))))
    (home-page "https://elixir-lang.org/")
    (synopsis "Functional meta-programming aware language")
    (description "Elixir is a dynamic, functional language used to build
scalable and maintainable applications.  Elixir leverages the Erlang VM, known
for running low-latency, distributed and fault-tolerant systems, while also
being successfully used in web development and the embedded software domain.")
    (license license:asl2.0)))

(define-public elixir-hex
  (package
    (name "elixir-hex")
    (version "2.1.1")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url "https://github.com/hexpm/hex")
             (commit (string-append "v" version))))
       (file-name (git-file-name name version))
       (sha256
        (base32
         "0fmrbl7dj8ndq1z7h13qgx3cv7vw3b1zf6krdrahcmx43bcdsix4"))))
    ;; The mix-build-system assumes that Hex exists.
    ;; We build Hex using the gnu-build-system.
    ;; Other Elixir packages use the mix-build-system.
    (build-system gnu-build-system)
    (inputs (list elixir))
    (arguments
     (list
      ;; Hex is needed to build packages used to test Hex.
      ;; To avoid this circularity, we disable tests.
      #:tests? #f
      #:phases
      #~(modify-phases %standard-phases
          (delete 'bootstrap)
          (delete 'configure)
          (replace 'build
            (lambda* (#:key inputs #:allow-other-keys)
              (setenv "MIX_ENV" "prod")
              (invoke "mix" "compile")))
          (replace 'install
            (lambda* (#:key inputs outputs #:allow-other-keys)
              (define X.Y #$(version-major+minor (package-version elixir)))
              (define out (string-append (assoc-ref outputs "out")
                                         "/lib/elixir/" X.Y "/hex"))
              (mkdir-p out)
              (let* ((prod-dir "_build/prod/lib/hex")
                     (prod-dir-mix (string-append prod-dir "/.mix")))
                (and (directory-exists? prod-dir-mix)
                     (delete-file-recursively prod-dir-mix))
              (copy-recursively "_build/prod/lib/hex" out)))))))
    (synopsis "Package manager for the Erlang VM")
    (description
     "This project provides tasks that integrate with Mix, Elixir's build
tool.")
    (home-page "https://hexdocs.pm/makeup_elixir/")
    (license license:bsd-2)))