;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2021 Liliana Marie Prikler <liliana.prikler@gmail.com>
;;; Copyright © 2021 Sarah Morgensen <iskarian@mgsn.dev>
;;; Copyright © 2021 Calum Irwin <calumirwin1@gmail.com>
;;; Copyright © 2022, 2023 Efraim Flashner <efraim@flashner.co.il>
;;;
;;; 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 zig)
  #:use-module (guix gexp)
  #:use-module (guix packages)
  #:use-module (guix utils)
  #:use-module (guix download)
  #:use-module (guix git-download)
  #:use-module ((guix licenses) #:prefix license:)
  #:use-module (guix build-system cmake)
  #:use-module (gnu packages)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages llvm)
  #:use-module (gnu packages llvm-meta)
  #:use-module (gnu packages web))

(define-public zig-0.9
  (package
    (name "zig")
    (version "0.9.1")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url "https://github.com/ziglang/zig.git")
             (commit version)))
       (file-name (git-file-name name version))
       (sha256
        (base32 "0nfvgg23sw50ksy0z0ml6lkdsvmd0278mq29m23dbb2jsirkhry7"))
       (patches (search-patches "zig-0.9-riscv-support.patch"
                                "zig-use-system-paths.patch"))))
    (build-system cmake-build-system)
    (arguments
     (list
      #:configure-flags
      #~(list #$@(if (%current-target-system)
                     (list (string-append "-DZIG_TARGET_TRIPLE="
                                          (%current-target-system)))
                     '()))
      #:out-of-source? #f         ; for tests
      ;; There are too many unclear test failures.
      #:tests? (not (or (target-riscv64?)
                        (%current-target-system)))
      #:phases
      #~(modify-phases %standard-phases
          #$@(if (target-riscv64?)
                 ;; It is unclear why all these tests fail to build.
                 `((add-after 'unpack 'adjust-tests
                     (lambda _
                       (substitute* "build.zig"
                         ((".*addRuntimeSafetyTests.*") "")
                         ((".*addRunTranslatedCTests.*") ""))
                       (substitute* "test/standalone.zig"
                         ;; These tests fail to build on riscv64-linux.
                         ;; They both contain 'exe.linkSystemLibrary("c");'
                         ((".*shared_library.*") "")
                         ((".*mix_o_files.*") "")
                         ;; ld.lld: error: undefined symbol: __tls_get_addr
                         ;; Is this symbol x86 only in glibc?
                         ((".*link_static_lib_as_system_lib.*") "")))))
                 '())
          (add-after 'configure 'set-cache-dir
            (lambda _
              ;; Set cache dir, otherwise Zig looks for `$HOME/.cache'.
              (setenv "ZIG_GLOBAL_CACHE_DIR"
                      (string-append (getcwd) "/zig-cache"))))
          (delete 'check)
          (add-after 'install 'check
            (lambda* (#:key tests? #:allow-other-keys)
              (when tests?
                (invoke (string-append #$output "/bin/zig")
                        ;; Testing the standard library takes >7.5GB RAM, and
                        ;; will fail if it is OOM-killed.  The 'test-toolchain'
                        ;; target skips standard library and doc tests.
                        "build" "test-toolchain"
                        ;; Stage 2 is experimental, not what we run with `zig',

                        "-Dskip-stage2-tests"
                        ;; Non-native tests try to link and execute non-native
                        ;; binaries.
                        "-Dskip-non-native")))))))
    (inputs
     (list clang-13                     ;Clang propagates llvm.
           lld-13))
    ;; Zig compiles fine with GCC, but also needs native LLVM libraries.
    (native-inputs
     (list llvm-13))
    (native-search-paths
     (list
      (search-path-specification
       (variable "C_INCLUDE_PATH")
       (files '("include")))
      (search-path-specification
       (variable "CPLUS_INCLUDE_PATH")
       (files '("include/c++" "include")))
      (search-path-specification
       (variable "LIBRARY_PATH")
       (files '("lib" "lib64")))))
    (synopsis "General purpose programming language and toolchain")
    (description "Zig is a general-purpose programming language and
toolchain.  Among other features it provides
@itemize
@item an Optional type instead of null pointers,
@item manual memory management,
@item generic data structures and functions,
@item compile-time reflection and compile-time code execution,
@item integration with C using zig as a C compiler, and
@item concurrency via async functions.
@end itemize")
    (home-page "https://github.com/ziglang/zig")
    ;; Currently building zig can take up to 10GB of RAM for linking stage1:
    ;; https://github.com/ziglang/zig/issues/6485
    (supported-systems %64bit-supported-systems)
    ;; Stage3 can take a lot of time and isn't verbose.
    (properties `((max-silent-time . 9600)
                  ,@(clang-compiler-cpu-architectures "13")))
    (license license:expat)))

(define-public zig-0.10
  (package
    (inherit zig-0.9)
    (name "zig")
    (version "0.10.1")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url "https://github.com/ziglang/zig.git")
             (commit version)))
       (file-name (git-file-name name version))
       (sha256
        (base32 "1sh5xjsksl52i4cfv1qj36sz5h0ln7cq4pdhgs3960mk8a90im7b"))
       (patches (search-patches "zig-use-baseline-cpu-by-default.patch"))))
    (arguments
     (substitute-keyword-arguments (package-arguments zig-0.9)
       ((#:configure-flags flags ''())
        #~(cons* "-DZIG_TARGET_MCPU=baseline"
                 "-DZIG_SHARED_LLVM=ON"
                 (string-append "-DZIG_LIB_DIR=" #$output "/lib/zig")
                 #$flags))
       ;; TODO: zig binary can't find ld-linux.
       ((#:validate-runpath? _ #t) #f)
       ((#:tests? _ #t) #t)
       ((#:phases phases '%standard-phases)
        #~(modify-phases #$phases
            #$@(if (target-riscv64?)
                   `((delete 'adjust-tests))
                   '())
            (add-after 'unpack 'set-CC
              (lambda _
                ;; Set CC, since the stage 2 zig relies on it to find the libc
                ;; installation, and otherwise silently links against its own.
                (setenv "CC" #$(cc-for-target))))
            (add-after 'patch-source-shebangs 'patch-more-shebangs
              (lambda* (#:key inputs #:allow-other-keys)
                ;; Zig uses information about /usr/bin/env to determine the
                ;; version of glibc and other data.
                (substitute* "lib/std/zig/system/NativeTargetInfo.zig"
                  (("/usr/bin/env") (search-input-file inputs "/bin/env")))))
            (replace 'check
              (lambda* (#:key tests? #:allow-other-keys)
                (when tests?
                  (invoke (string-append #$output "/bin/zig")
                          "build" "test"
                          ;; We're not testing the compiler bootstrap chain.
                          "-Dskip-stage1"
                          "-Dskip-stage2-tests"
                          ;; Non-native tests try to link and execute non-native
                          ;; binaries.
                          "-Dskip-non-native"))))))))
    (inputs
     (modify-inputs (package-inputs zig-0.9)
       (prepend zlib `(,zstd "lib"))
       (replace "clang" clang-15)
       (replace "lld" lld-15)))
    (native-inputs
     (modify-inputs (package-native-inputs zig-0.9)
       (replace "llvm" llvm-15)))
    (properties `((max-silent-time . 9600)
                  ,@(clang-compiler-cpu-architectures "15")))))

(define zig-0.10.0-538-source
  ;; "std: added eql to DynamicBitSet and DynamicBitSetUnmanaged"
  (let ((commit "bf316e550671cc71eb498b3cf799493627bb0fdc")
        (revision "538"))
    (origin
      (method git-fetch)
      (uri (git-reference
            (url "https://github.com/ziglang/zig")
            (commit commit)))
      (file-name (git-file-name "zig" (git-version "0.10" revision commit)))
      (sha256
       (base32 "1dchc2bp842jlw0byssqzindv8cigpqcj2hk3752667jrrww13vv")))))

(define zig-0.10.0-539-patch
  ;; "remove `-fstage1` option"
  (let ((commit "28514476ef8c824c3d189d98f23d0f8d23e496ea"))
    (origin
      (method url-fetch)
      (uri (string-append
            "https://github.com/ziglang/zig/commit/" commit ".patch"))
      (sha256
       (base32 "0qxxiafg2sd5rr4xhw0c12rygd7zh1rmf3x8hfialyxmsbi5pfxp")))))

(define zig-0.10.0-542-patch
  ;; "actually remove stage1"
  (let ((commit "3ba916584db5485c38ebf2390e8d22bc6d81bf8e"))
    (origin
      (method url-fetch)
      (uri (string-append
            "https://github.com/ziglang/zig/commit/" commit ".patch"))
      (sha256
       (base32 "1l09gmbr3vqzinb63kvaskgs1d0mvm1m7w3ai3ngwg5zlabyya35")))))

;; Build zig1.wasm from source.
(define zig-0.10.0-610-bootstrap
  (let ((commit "e7d28344fa3ee81d6ad7ca5ce1f83d50d8502118")
        (revision "610"))
    (package
      (inherit zig-0.10)
      (name "zig")
      (version (git-version "0.10.0" revision commit))
      (source (origin
                (method git-fetch)
                (uri (git-reference
                      (url "https://github.com/ziglang/zig")
                      (commit commit)))
                (file-name (git-file-name name version))
                (modules '((guix build utils)))
                (snippet '(delete-file "stage1/zig1.wasm.zst"))
                (sha256
                 (base32
                  "08pm3f4hh6djl3szhqgm7fa3qisdl2xh9jrp18m0z7bk2vd0bzw7"))))
      (arguments
       (substitute-keyword-arguments (package-arguments zig-0.10)
         ((#:phases phases '%standard-phases)
          #~(modify-phases #$phases
              (add-after 'unpack 'prepare-source
                (lambda* (#:key native-inputs inputs #:allow-other-keys)
                  (copy-recursively "." "../source-backup")
                  ;; Revert "actually remove stage1".
                  (invoke "patch" "--reverse" "--strip=1"
                          "--input" #+zig-0.10.0-542-patch)
                  ;; Revert "remove `-fstage1` option".
                  (false-if-exception
                   (invoke "patch" "--reverse" "--strip=1"
                           "--input" #+zig-0.10.0-539-patch))
                  ;; Resolve conflicts in previous patching.
                  (invoke
                   "patch" "--forward" "--strip=1" "--input"
                   #+(local-file
                      (search-patch
                       "zig-0.10.0-610-bootstrap-resolve-conflicts.patch")))
                  ;; Restore build system.
                  (rename-file "stage1/config.zig.in" "src/config.zig.in")
                  (substitute* "src/config.zig.in"
                    (("(have_stage1 = )false" _ prefix)
                     (string-append prefix "true")))
                  (for-each
                   (lambda (file)
                     (copy-file (string-append #+zig-0.10.0-538-source "/" file)
                                file))
                   '("build.zig" "CMakeLists.txt"))))
              (add-after 'install 'build-zig1
                (lambda _
                  (copy-recursively "../source-backup" ".")
                  (invoke (string-append #$output "/bin/zig")
                          "build" "update-zig1" "--verbose")))
              (add-after 'build-zig1 'install-zig1
                (lambda _
                  (install-file "stage1/zig1.wasm.zst"
                                (string-append #$output:zig1 "/bin"))))
              (replace 'check
                (lambda* (#:key tests? #:allow-other-keys)
                  (when tests?
                    (invoke (string-append #$output "/bin/zig")
                            "test" "-I" "test" "test/behavior.zig"))))))))
      (native-inputs
       (modify-inputs (package-native-inputs zig-0.10)
         (prepend binaryen)))
      (outputs '("out" "zig1")))))

(define-public zig zig-0.10)