;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2016 Federico Beffa <beffa@fbengineering.ch>
;;; Copyright © 2016 Efraim Flashner <efraim@flashner.co.il>
;;; Copyright © 2017, 2019 Tobias Geerinckx-Rice <me@tobias.gr>
;;; Copyright © 2019 Brett Gilio <brettg@gnu.org>
;;; Copyright © 2020 Brendan Tildesley <mail@brendan.scot>
;;; Copyright © 2021 Philip McGrath <philip@philipmcgrath.com>
;;;
;;; 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 chez)
  #:use-module (gnu packages)
  #:use-module ((guix licenses)
                #:select (gpl2+ gpl3+ lgpl2.0+ lgpl2.1+ asl2.0 bsd-3 expat
                          public-domain))
  #:use-module (guix packages)
  #:use-module (guix download)
  #:use-module (guix git-download)
  #:use-module (guix utils)
  #:use-module (guix gexp)
  #:use-module (guix build-system copy)
  #:use-module (guix build-system gnu)
  #:use-module (guix build-system copy)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages ncurses)
  #:use-module (gnu packages ghostscript)
  #:use-module (gnu packages linux)
  #:use-module (gnu packages netpbm)
  #:use-module (gnu packages racket)
  #:use-module (gnu packages tex)
  #:use-module (gnu packages compression)
  #:use-module (gnu packages image)
  #:use-module (gnu packages xorg)
  #:use-module (ice-9 match)
  #:use-module (srfi srfi-1)
  #:use-module (srfi srfi-26)
  #:export (chez-scheme-for-system
            nix-system->chez-machine
            chez-machine->nonthreaded
            chez-machine->threaded
            unpack-nanopass+stex))

;; Commentary:
;;
;; The bootstrapping paths for Chez Scheme and Racket are closely
;; entwined. Racket CS (the default Racket implementation) is based on (a fork
;; of) Chez Scheme. Racket's variant of Chez Scheme shares sources for
;; nanopass and stex with upstream Chez Scheme.
;;
;; Racket's variant of Chez Scheme can be bootstrapped by an older Racket
;; implementation, Racket BC, which can be bootstrapped from C. Porting that
;; code to work with upstream Chez Scheme (or finding an old version that
;; does) is our best hope for some day bootstrapping upstream Chez Scheme from
;; source.
;;
;; Code:

(define* (chez-scheme-for-system #:optional
                                 (system (or (%current-target-system)
                                             (%current-system))))
  "Return 'chez-scheme' unless only 'chez-scheme-for-racket' supports SYSTEM,
including support for native threads."
  (if (or
       ;; full support upstream
       (and=> (chez-upstream-features-for-system system)
              (cut memq 'threads <>))
       ;; no support anywhere
       (not (nix-system->chez-machine system)))
      chez-scheme
      chez-scheme-for-racket))

(define (chez-machine->nonthreaded machine)
  "Given a string MACHINE naming a Chez Scheme machine type, returns a string
naming the nonthreaded machine type for the same architecture and OS as
MACHINE.  The returned string may share storage with MACHINE."
  ;; Chez Scheme documentation consistently uses "nonthreaded" rather than
  ;; e.g. "unthreaded"
  (if (eqv? #\t (string-ref machine 0))
      (substring machine 1)
      machine))
(define (chez-machine->threaded machine)
  "Like @code{chez-machine->nonthreaded}, but returns the threaded machine
type."
  (if (eqv? #\t (string-ref machine 0))
      machine
      (string-append "t" machine)))

;; Based on the implementation from raco-cross-lib/private/cross/platform.rkt
;; in https://github.com/racket/raco-cross.
;; For supported platforms, refer to release_notes/release_notes.stex in the
;; upstream Chez Scheme repository or to racket/src/ChezScheme/README.md
;; in https://github.com/racket/racket.
(define %nix-arch-to-chez-alist
  `(("x86_64" . "a6")
    ("i386" . "i3")
    ("aarch64" . "arm64")
    ("armhf" . "arm32") ;; Chez supports ARM v6+
    ("ppc" . "ppc32")))
(define %nix-os-to-chez-alist
  `(("w64-mingw32" . "nt")
    ("darwin" . "osx")
    ("linux" . "le")
    ("freebsd" . "fb")
    ("openbsd" . "ob")
    ("netbsd" . "nb")
    ("solaris" . "s2")))

(define (chez-machine->nix-system machine)
  "Return the Nix system type corresponding to the Chez Scheme machine type
MACHINE.  If MACHINE is not a string representing a known machine type, an
exception is raised.  This function does not distinguish between threaded and
nonthreaded variants of MACHINE.

Note that this function only handles Chez Scheme machine types in the
strictest sense, not other kinds of descriptors sometimes used in place of a
Chez Scheme machine type by Racket, such as @code{\"pb\"}, @code{#f}, or
@code{\"racket\"}.  (When using such extensions, the Chez Scheme machine type
for the host system is often still relevant.)"
  (let ((machine (chez-machine->nonthreaded machine)))
    (let find-arch ((alist %nix-arch-to-chez-alist))
      (match alist
        (((nix . chez) . alist)
         (if (string-prefix? chez machine)
             (string-append
              nix "-" (let ((machine-os
                             (substring machine (string-length chez))))
                        (let find-os ((alist %nix-os-to-chez-alist))
                          (match alist
                            (((nix . chez) . alist)
                             (if (equal? chez machine-os)
                                 nix
                                 (find-os alist)))))))
             (find-arch alist)))))))

(define* (nix-system->chez-machine #:optional
                                   (system (or (%current-target-system)
                                               (%current-system))))
  "Return the Chez Scheme machine type corresponding to the Nix system
identifier SYSTEM, or @code{#f} if the translation of SYSTEM to a Chez Scheme
machine type is undefined.

It is unspecified whether the resulting string will name a threaded or a
nonthreaded machine type: when the distinction is relevant, use
@code{chez-machine->nonthreaded} or @code{chez-machine->threaded} to adjust
the result."
  (let* ((hyphen (string-index system #\-))
         (nix-arch (substring system 0 hyphen))
         (nix-os (substring system (+ 1 hyphen)))
         (chez-arch (assoc-ref %nix-arch-to-chez-alist nix-arch))
         (chez-os (assoc-ref %nix-os-to-chez-alist nix-os)))
    (and chez-arch chez-os (string-append chez-arch chez-os))))

(define* (chez-upstream-features-for-system #:optional
                                            (system
                                             (or (%current-target-system)
                                                 (%current-system))))
  "Return a list of symbols naming features supported by upstream Chez Scheme
for the Nix system identifier SYSTEM, or @code{#f} if upstream Chez Scheme
does not support SYSTEM at all.

If native threads are supported, the returned list will include
@code{'threads}.  Other feature symbols may be added in the future."
  (cond
   ((not (nix-system->chez-machine system))
    #f)
   ((target-aarch64? system)
    #f)
   ((target-arm32? system)
    (and (target-linux? system)
         '()))
   ((target-ppc32? system)
    (and (target-linux? system)
         '(threads)))
   (else
    '(threads))))

;;
;; Chez Scheme:
;;


(define unpack-nanopass+stex
  #~(begin
      (copy-recursively
       (dirname (search-input-file %build-inputs
                                   "lib/chez-scheme/nanopass.ss"))
       "nanopass"
       #:keep-mtime? #t)
      (mkdir-p "stex")
      (with-output-to-file "stex/Mf-stex"
        (lambda ()
          ;; otherwise, it will try to download submodules
          (display "# to placate ../configure")))))

(define-public chez-scheme
  (package
    (name "chez-scheme")
    ;; The version should match `(scheme-version-number)`.
    ;; See s/cmacros.ss c. line 360.
    (version "9.5.6")
    (source (origin
              (method git-fetch)
              (uri (git-reference
                    (url "https://github.com/cisco/ChezScheme")
                    (commit (string-append "v" version))))
              (sha256
               (base32
                "07s433hn1z2slfc026sidrpzxv3a8narcd40qqr1xrpb9012xdky"))
              (file-name (git-file-name name version))
              (snippet #~(begin
                           (use-modules (guix build utils))
                           ;; TODO: consider putting this in a (guix ...) or
                           ;; (guix build ...)  module so it can be shared
                           ;; with the Racket origin without cyclic issues.
                           (for-each (lambda (dir)
                                       (when (directory-exists? dir)
                                         (delete-file-recursively dir)))
                                     '("stex"
                                       "nanopass"
                                       "lz4"
                                       "zlib"))))))
    (build-system gnu-build-system)
    (inputs
     (list
      `(,util-linux "lib") ;<-- libuuid
      zlib
      lz4
      ncurses ;<-- for expeditor
      ;; for X11 clipboard support in expeditor:
      ;; https://github.com/cisco/ChezScheme/issues/9#issuecomment-222057232
      libx11))
    (native-inputs (list chez-scheme-bootstrap-bootfiles
                         chez-nanopass-bootstrap
                         stex-bootstrap))
    (native-search-paths
     (list (search-path-specification
            (variable "CHEZSCHEMELIBDIRS")
            (files '("lib/chez-scheme")))))
    (outputs '("out" "doc"))
    (arguments
     (list
      #:modules
      '((guix build gnu-build-system)
        (guix build utils)
        (ice-9 ftw)
        (ice-9 match))
      #:test-target "test"
      ;; TODO when we fix armhf, it may not support --threads
      #:configure-flags #~'("--threads")
      #:phases
      #~(modify-phases %standard-phases
          (add-after 'unpack 'unpack-nanopass+stex
            (lambda args
              #$unpack-nanopass+stex))
          (add-after 'unpack-nanopass+stex 'unpack-bootfiles
            (lambda* (#:key native-inputs inputs #:allow-other-keys)
              (when (directory-exists? "boot")
                (delete-file-recursively "boot"))
              (copy-recursively
               (search-input-directory (or native-inputs inputs)
                                       "lib/chez-scheme-bootfiles")
               "boot")))
          ;; NOTE: the custom Chez 'configure' script doesn't allow
          ;; unrecognized flags, such as those automatically added
          ;; by `gnu-build-system`.
          (replace 'configure
            (lambda* (#:key inputs (configure-flags '()) #:allow-other-keys)
              ;; add flags which are always required:
              (let ((flags (cons* (string-append "--installprefix=" #$output)
                                  "ZLIB=-lz"
                                  "LZ4=-llz4"
                                  "--libkernel"
                                  ;; Guix will do compress-man-pages,
                                  ;; and letting Chez try causes an error
                                  "--nogzip-man-pages"
                                  configure-flags)))
                (format #t "configure flags: ~s~%" flags)
                ;; Some makefiles (for tests) don't seem to propagate CC
                ;; properly, so we take it out of their hands:
                (setenv "CC" #$(cc-for-target))
                (setenv "HOME" "/tmp")
                (apply invoke "./configure" flags))))
          ;; The binary file name is called "scheme" as is the one from
          ;; MIT/GNU Scheme.  We add a symlink to use in case both are
          ;; installed.
          (add-after 'install 'install-symlink
            (lambda* (#:key outputs #:allow-other-keys)
              (let* ((scheme (search-input-file outputs "/bin/scheme"))
                     (bin-dir (dirname scheme)))
                (symlink scheme
                         (string-append bin-dir "/chez-scheme"))
                (match (find-files (string-append bin-dir "/../lib")
                                   "scheme.boot")
                  ((scheme.boot)
                   (symlink scheme.boot
                            (string-append (dirname scheme.boot)
                                           "/chez-scheme.boot")))))))
          ;; Building the documentation requires stex and a running scheme.
          ;; FIXME: this is probably wrong for cross-compilation
          (add-after 'install-symlink 'install-doc
            (lambda* (#:key native-inputs inputs outputs #:allow-other-keys)
              (match (assoc-ref outputs "doc")
                (#f
                 (format #t "not installing docs~%"))
                (doc-prefix
                 (let* ((chez+version (strip-store-file-name #$output))
                        (scheme (search-input-file outputs "/bin/scheme"))
                        (stexlib (search-input-directory (or native-inputs
                                                             inputs)
                                                         "/lib/stex"))
                        (doc-dir (string-append doc-prefix
                                                "/share/doc/"
                                                chez+version)))
                   (define* (stex-make #:optional (suffix ""))
                     (invoke "make" "install"
                             (string-append "Scheme=" scheme)
                             (string-append "STEXLIB=" stexlib)
                             (string-append "installdir=" doc-dir suffix)))
                   (with-directory-excursion "csug"
                     (stex-make "/csug"))
                   (with-directory-excursion "release_notes"
                     (stex-make "/release_notes"))
                   (with-directory-excursion doc-dir
                     (symlink "release_notes/release_notes.pdf"
                              "release_notes.pdf")
                     (symlink "csug/csug9_5.pdf"
                              "csug.pdf"))))))))))
    ;; Chez Scheme does not have a  MIPS backend.
    ;; FIXME: Debian backports patches to get armhf working.
    ;; We should too. It is the Chez machine type arm32le
    ;; (no threaded version upstream yet, though there is in
    ;; Racket's fork), more specifically (per the release notes) ARMv6.
    (supported-systems
     (delete
      "armhf-linux" ;; <-- should work, but reportedly broken
      (filter chez-upstream-features-for-system
              %supported-systems)))
    (home-page "https://cisco.github.io/ChezScheme/")
    (synopsis "R6RS Scheme compiler and run-time")
    (description
     "Chez Scheme is a compiler and run-time system for the language of the
Revised^6 Report on Scheme (R6RS), with numerous extensions.  The compiler
generates native code for each target processor, with support for x86, x86_64,
and 32-bit PowerPC architectures.")
    (license asl2.0)))

(define-public chez-scheme-for-racket
  (package
    (inherit chez-scheme)
    (name "chez-scheme-for-racket")
    (version "9.5.7.3")
    ;; The version should match `(scheme-fork-version-number)`.
    ;; See racket/src/ChezScheme/s/cmacros.ss c. line 360.
    ;; It will always be different than the upstream version!
    ;; When updating, remember to also update %racket-version in racket.scm.
    (source #f) ; avoid problematic cycle with racket.scm
    (inputs
     (modify-inputs (package-inputs chez-scheme)
       (delete "libx11" "util-linux:lib")))
    (native-inputs
     (modify-inputs (package-native-inputs chez-scheme)
       (replace "chez-scheme-bootstrap-bootfiles"
         chez-scheme-for-racket-bootstrap-bootfiles)))
    (arguments
     (substitute-keyword-arguments (package-arguments chez-scheme)
       ((#:configure-flags cfg-flags #~'())
        #~(cons "--disable-x11" #$cfg-flags))
       ((#:phases those-phases #~%standard-phases)
        #~(let* ((those-phases #$those-phases)
                 (unpack (assoc-ref those-phases 'unpack)))
            (modify-phases those-phases
              (replace 'unpack
                (lambda args
                  (unpack #:source #$(or (package-source this-package)
                                         (package-source racket-vm-bc)))))
              (add-after 'unpack 'chdir
                (lambda args
                  (chdir "racket/src/ChezScheme"))))))))
    (supported-systems (filter nix-system->chez-machine
                               %supported-systems))
    (home-page "https://github.com/racket/ChezScheme")
    ;; ^ This is downstream of https://github.com/racket/racket,
    ;; but it's designed to be a friendly landing place for people
    ;; who want a ChezScheme-shaped repositroy.
    (synopsis "Variant of Chez Scheme extended for Racket")
    (description "This variant of Chez Scheme is extended to support the
implementation of Racket.  It may be useful on platforms that are not yet
supported by upstream Chez Scheme.

Main additions to Chez Scheme in the Racket variant:
@itemize @bullet
@item
AArch64 support
@item
Portable bytes (@code{pb}) support, which is mainly useful for bootstrapping
a build on any supported platform
@item
Unboxed floating-point arithmetic and flvectors
@item
Type reconstruction during optimization (especially for safe code)
@item
Continuation attachments
@item
Parallel garbage collection, in-place garbage collection for old-generation
objects (instead of always copying), and reachability-based memory
accounting
@item
Ordered finalization, immobile (but collectable) objects, weak/ephemeron
generic hash tables, and reference bytevectors
@item
Faster multiplication and division for large exact numbers
@end itemize")
    (license asl2.0)))

;;
;; Bootfiles:
;;

(define-public chez-scheme-bootstrap-bootfiles
  (package
    (inherit chez-scheme)
    (name "chez-scheme-bootstrap-bootfiles")
    (inputs '())
    (native-inputs '())
    (outputs '("out"))
    (build-system copy-build-system)
    ;; TODO: cross compilation
    (arguments
     (list #:install-plan
           #~`(("boot/" "lib/chez-scheme-bootfiles"))))
    (supported-systems
     ;; Upstream only distributes pre-built bootfiles for
     ;; arm32le and t?(i3|a6)(le|nt|osx)
     (filter (lambda (system)
               (let ((machine (and=> (nix-system->chez-machine system)
                                     chez-machine->nonthreaded)))
                 (or (equal? "arm32le" machine)
                     (and machine
                          (member (substring machine 0 2) '("i3" "a6"))
                          (or-map (cut string-suffix? <> machine)
                                  '("le" "nt" "osx"))))))
             %supported-systems))
    (synopsis "Chez Scheme bootfiles (binary seed)")
    (description
     "Chez Scheme is a self-hosting compiler: building it requires
``bootfiles'' containing the Scheme-implemented portions compiled for the
current platform.  (Chez can then cross-compile bootfiles for all other
supported platforms.)

This package provides bootstrap bootfiles for upstream Chez Scheme.
Currently, it simply packages the binaries checked in to the upsream
repository.  Hopefully we can eventually adapt Racket's @code{cs-bootstrap} to
work with upstream Chez Scheme so that we can bootstrap these files from
source.")))

(define-public chez-scheme-for-racket-bootstrap-bootfiles
  (package
    (inherit chez-scheme-bootstrap-bootfiles)
    (name "chez-scheme-for-racket-bootstrap-bootfiles")
    (version (package-version chez-scheme-for-racket))
    (source #f) ; avoid problematic cycle with racket.scm
    (native-inputs (list chez-nanopass-bootstrap racket-vm-bc))
    ;; TODO: cross compilation
    (arguments
     (substitute-keyword-arguments
         (package-arguments chez-scheme-bootstrap-bootfiles)
       ((#:phases those-phases #~%standard-phases)
        #~(let* ((those-phases #$those-phases)
                 (unpack (assoc-ref those-phases 'unpack)))
            (modify-phases those-phases
              (replace 'unpack
                (lambda args
                  (unpack #:source #$(or (package-source this-package)
                                         (package-source racket-vm-bc)))))
              (add-after 'unpack 'chdir
                (lambda args
                  (chdir "racket/src/ChezScheme")))
              (add-after 'chdir 'unpack-nanopass+stex
                (lambda args
                  #$unpack-nanopass+stex))
              (add-before 'install 'build
                (lambda* (#:key native-inputs inputs #:allow-other-keys)
                  (invoke (search-input-file (or native-inputs inputs)
                                             "/opt/racket-vm/bin/racket")
                          "rktboot/main.rkt"))))))))
    (supported-systems
     (package-supported-systems chez-scheme-for-racket))
    (home-page "https://github.com/racket/ChezScheme")
    ;; ^ This is downstream of https://github.com/racket/racket,
    ;; but it's designed to be a friendly landing place for people
    ;; who want a ChezScheme-shaped repositroy.
    (synopsis "Chez Scheme bootfiles bootstrapped by Racket")
    (description "Chez Scheme is a self-hosting compiler: building it
requires ``bootfiles'' containing the Scheme-implemented portions compiled for
the current platform.  (Chez can then cross-compile bootfiles for all other
supported platforms.)

The Racket package @code{cs-bootstrap} (part of the main Racket Git
repository) implements enough of a Chez Scheme simulation to load the Chez
Scheme compiler purely from source into Racket and apply the compiler to
itself, thus bootstrapping Chez Scheme.  Bootstrapping takes about 10 times as
long as using an existing Chez Scheme, but @code{cs-bootstrap} supports Racket
7.1 and later, including the Racket BC variant.

Note that the generated bootfiles are specific to Racket's fork of Chez
Scheme, and @code{cs-bootstrap} does not currently support building upstream
Chez Scheme.")))

;;
;; Chez's bootstrap dependencies:
;;

(define-public stex-bootstrap
  ;; This commit includes a fix which we would otherwise want to use as
  ;; patch.  Let's revert to tagged releases as soon as one becomes available.
  (let ((commit "54051494434a197772bf6ca5b4e6cf6be55f39a5")
        (revision "1"))
    (hidden-package
     (package
       (name "stex")
       ;; ^ Debian calls this "stex", not "chez-stex". It is a set of
       ;; command-line tools, and there isn't a Scheme API, let alone a
       ;; Chez-specific one, except perhaps that the Scheme examples are
       ;; assumed to be Chez-compatible.
       (version (git-version "1.2.2" revision commit))
       (source
        (origin
          (method git-fetch)
          (uri (git-reference
                (url "https://github.com/dybvig/stex")
                (commit commit)))
          (sha256
           (base32 "01jnvw8qw33gnpzwrakwhsr05h6b609lm180jnspcrb7lds2p23d"))
          (file-name (git-file-name name version))
          (snippet
           #~(for-each delete-file
                       '("sbin/install" "doc/stex.pdf" "doc/stex.html")))))
       (outputs '("out"))
       (build-system copy-build-system)
       ;; N.B. Upstream does not seem to support cross-compilation,
       ;; though it would probably be easy to add.
       (propagated-inputs
        (list xorg-rgb
              (texlive-updmap.cfg
               (list texlive-dvips-l3backend
                     texlive-hyperref
                     texlive-bibtex
                     texlive-epsf
                     texlive-fonts-ec
                     texlive-oberdiek))
              ghostscript
              netpbm))
       ;; Debian uses a versionless path for STEXLIB,
       ;; which is much more convienient.
       (arguments
        (list
         #:install-plan #~`(("inputs" "lib/stex/")
                            ("gifs" "lib/stex/")
                            ("math" "lib/stex/")
                            ("src" "lib/stex/")
                            ("Mf-stex" "lib/stex/")
                            ("Makefile.template" "lib/stex/"))
         #:phases
         #~(modify-phases %standard-phases
             (add-before 'install 'patch-sources
               (lambda* (#:key native-inputs inputs outputs #:allow-other-keys)
                 (define scheme
                   (false-if-exception
                    (search-input-file inputs "/bin/scheme")))
                 (when scheme
                   (setenv "Scheme" scheme))
                 (substitute* '("Makefile.template"
                                "doc/Makefile")
                   (("STEXLIB=[^\n]*")
                    (string-append "STEXLIB=" #$output "/lib/stex"))
                   (("Scheme=[^\n]*")
                    (string-append "Scheme=" (or scheme "scheme"))))
                 (substitute* '("Mf-stex"
                                "math/Makefile")
                   (("/bin/rm")
                    "rm"))
                 (substitute* "Mf-stex"
                   (("SHELL=bash")
                    ;; avoid Solaris workaround
                    "#SHELL=bash"))))
             (add-after 'install 'maybe-compile
               (lambda* (#:key native-inputs inputs outputs #:allow-other-keys)
                 (cond
                  ((getenv "Scheme")
                   => (lambda (scheme)
                        (define makefile
                          (string-append (getcwd) "/Makefile"))
                        (define machine
                          #$(chez-machine->threaded
                             (nix-system->chez-machine)))
                        (with-directory-excursion
                            (search-input-directory outputs "/lib/stex")
                          (invoke "make"
                                  "-f" makefile
                                  (string-append "Scheme=" scheme))
                          (for-each delete-file
                                    (find-files machine "\\.")))))
                  (else
                   ;; for bootstrapping, can run without ahead-of-time
                   ;; compilation
                   (format #t "not compiling~%")))))
             (add-after 'maybe-compile 'maybe-make-docs
               (lambda* (#:key native-inputs inputs outputs #:allow-other-keys)
                 (cond
                  ((assoc-ref outputs "doc")
                   => (lambda (doc-prefix)
                        (define doc-dir
                          (string-append doc-prefix "/share/doc/stex"))
                        ;; the Makefile is referenced in the documentation
                        (copy-recursively "doc" doc-dir)
                        (install-file "ReadMe" doc-dir)
                        (with-directory-excursion "doc"
                          (invoke "make")
                          (install-file "stex.html" doc-dir)
                          (install-file "stex.pdf" doc-dir))))
                  (else
                   (format #t "not making docs~%"))))))))
       (home-page "https://github.com/dybvig/stex")
       (synopsis "LaTeX with embeded Scheme code and HTML generation")
       (description "The @code{stex} package extends LaTeX with a handful of
commands for including Scheme code (or pretty much any other kind of code, as
long as you don't plan to use the Scheme-specific transcript support) in a
document.  It provides the programs @code{scheme-prep} and @code{html-prep} to
convert @code{stex} documents to LaTeX and HTML, respectively, plus makefile
templates, style files, and other resources.  The @code{stex} system is used
to typeset @cite{The Scheme Programming Language} and the @cite{Chez Scheme
User's Guix}, among other documents.")
       (license expat)))))

(define-public stex
  (package/inherit stex-bootstrap
    (inputs (modify-inputs (package-inputs stex-bootstrap)
              (prepend chez-scheme)))
    (outputs '("out" "doc"))
    (properties '())))

(define-public chez-nanopass-bootstrap
  (hidden-package
   (package
     (name "chez-nanopass")
     (version "1.9.2")
     (source
      (origin
        (method git-fetch)
        (uri (git-reference
              (url "https://github.com/nanopass/nanopass-framework-scheme")
              (commit (string-append "v" version))))
        (sha256
         (base32 "16vjsik9rrzbabbhbxbaha51ppi3f9n8rk59pc6zdyffs0vziy4i"))
        (file-name (git-file-name "nanopass-framework-scheme" version))
        (snippet
         #~(begin
             (use-modules (guix build utils))
             (when (file-exists? "doc/user-guide.pdf")
               (delete-file "doc/user-guide.pdf"))
             (substitute* "doc/Makefile"
               (("include ~/stex/Mf-stex")
                "include $(STEXLIB)/Mf-stex"))))))
     (build-system copy-build-system)
     (arguments
      (list #:install-plan
            #~`(("nanopass.ss" "lib/chez-scheme/")
                ("nanopass" "lib/chez-scheme/"))))
     (home-page "https://nanopass.org")
     (synopsis "DSL for compiler development")
     (description "The Nanopass framework is an embedded domain-specific
language for writing compilers composed of several simple passes that
operate over well-defined intermediate languages.  The goal of this
organization is both to simplify the understanding of each pass, because it
is responsible for a single task, and to simplify the addition of new passes
anywhere in the compiler.  Nanopass reduces the boilerplate required to
create compilers, making them easier to understand and maintain.")
     (license expat))))

(define-public chez-nanopass
  (package/inherit chez-nanopass-bootstrap
    (properties '())
    ;; TODO: cross-compilation
    (native-inputs (list chez-scheme stex))
    (arguments
     (substitute-keyword-arguments (package-arguments chez-nanopass-bootstrap)
       ((#:install-plan base-plan)
        #~`(("nanopass.so" "lib/chez-scheme/")
            ("doc/user-guide.pdf" #$(string-append
                                     "share/doc/"
                                     (package-name this-package)
                                     "-"
                                     (package-version this-package)
                                     "/"))
            ,@#$base-plan))
       ((#:phases base-phases #~%standard-phases)
        #~(modify-phases #$base-phases
            (add-before 'install 'compile-and-test
              (lambda args
                (invoke "scheme"
                        "--compile-imported-libraries"
                        "--program" "test-all.ss")))
            (add-after 'compile-and-test 'build-doc
              (lambda* (#:key native-inputs inputs #:allow-other-keys)
                (with-directory-excursion "doc"
                  (invoke "make"
                          (string-append "Scheme="
                                         (search-input-file
                                          (or native-inputs inputs)
                                          "/bin/scheme"))
                          (string-append "STEXLIB="
                                         (search-input-directory
                                          (or native-inputs inputs)
                                          "/lib/stex"))))))))))))

;;
;; Other Chez packages:
;;

;; Help function for Chez Scheme to add the current path to
;; CHEZSCHEMELIBDIRS.
(define chez-configure
  #~(lambda _
      (let ((chez-env (getenv "CHEZSCHEMELIBDIRS")))
        (setenv "CHEZSCHEMELIBDIRS"
                (if chez-env
                    (string-append ".:" chez-env)
                    ".")))))

;; Help function to define make flags for some Chez Scheme custom make
;; files.
(define (chez-make-flags name version)
  #~(let ((out #$output))
      (list
       ;; Set 'schemedir' so that libraries are installed in
       ;; 'lib/chez-scheme' like Chez's 'native-search-paths' expects.
       (string-append "schemedir=" out "/lib/chez-scheme")
       (string-append "PREFIX=" out)
       (string-append "DOCDIR=" out "/share/doc/" #$name "-" #$version))))

(define-public chez-srfi
  (package
    (name "chez-srfi")
    (version "1.0")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url "https://github.com/fedeinthemix/chez-srfi")
             (commit (string-append "v" version))))
       (sha256
        (base32 "1vgn984mj2q4w6r2q66h7qklp2hrh85wwh4k9yisga5fi0ps7myf"))
       (file-name (git-file-name name version))))
    (build-system gnu-build-system)
    (native-inputs
     (list (chez-scheme-for-system)))
    (arguments
     (list #:make-flags (chez-make-flags name version)
           #:test-target "test"
           #:phases #~(modify-phases %standard-phases
                        (replace 'configure
                          #$chez-configure))))
    (home-page "https://github.com/fedeinthemix/chez-srfi")
    (synopsis "SRFI libraries for Chez Scheme")
    (description
     "This package provides a collection of SRFI libraries for Chez Scheme.")
    (license expat)))

(define-public chez-web
  (let ((commit "5fd177fe53f31f466bf88720d03c95a3711a8bea")
        (revision "1"))
    (package
      (name "chez-web")
      ;; Release 2.0 is different and doesn't work.
      (version (git-version "2.0" revision commit))
      (source
       (origin
         (method git-fetch)
         (uri (git-reference
               (url "https://github.com/arcfide/ChezWEB")
               (commit commit)))
         (file-name (git-file-name name version))
         (sha256
          (base32 "1dq25qygyncbfq4kwwqqgyyakfqjwhp5q23vrf3bff1p66nyfl3b"))))
      (build-system gnu-build-system)
      (native-inputs
       (list (chez-scheme-for-system)
             ghostscript
             ;; FIXME: This package fails to build with the error:
             ;;     mktexpk: don't know how to create bitmap font for bchr8r
             ;; Replacing the following with `texlive` fixes it.
             ;; What is missing?
             (texlive-updmap.cfg (list texlive-oberdiek
                                       texlive-epsf
                                       texlive-metapost
                                       texlive-charter
                                       texlive-pdftex
                                       texlive-context
                                       texlive-cm
                                       texlive-tex-plain))))
      (arguments
       (list
        #:make-flags
        #~(list (string-append "PREFIX=" #$output)
                (string-append "DOCDIR=" #$output "/share/doc/"
                               #$name "-" #$version)
                ;; lib/chez-scheme/chezweb ???
                (string-append "LIBDIR=" #$output "/lib/chezweb")
                (string-append "TEXDIR=" #$output "/share/texmf-local"))
        #:tests? #f ; no tests
        #:phases
        #~(modify-phases %standard-phases
            ;; This package has a custom "bootstrap" script that
            ;; is meant to be run from the Makefile.
            (delete 'bootstrap)
            (replace 'configure
              (lambda* _
                (copy-file "config.mk.template" "config.mk")
                (substitute* "tangleit"
                  (("\\./cheztangle\\.ss" all)
                   (string-append "scheme --program " all)))
                (substitute* "weaveit"
                  (("mpost chezweb\\.mp")
                   "mpost --tex=tex chezweb.mp")
                  (("\\./chezweave" all)
                   (string-append "scheme --program " all)))
                (substitute* "installit"
                  (("-g \\$GROUP -o \\$OWNER") "")))))))
      (home-page "https://github.com/arcfide/ChezWEB")
      (synopsis "Hygienic Literate Programming for Chez Scheme")
      (description "ChezWEB is a system for doing Knuthian style WEB
programming in Scheme.")
      (license expat))))

(define-public chez-sockets
  (let ((commit "bce96881c06bd69a6757a6bff139744153924140")
        (revision "1"))
    (package
      (name "chez-sockets")
      (version (git-version "0.0.0" revision commit))
      (source
       (origin
         (method git-fetch)
         (uri (git-reference
               (url "https://github.com/arcfide/chez-sockets")
               (commit commit)))
         (file-name (git-file-name name version))
         (sha256
          (base32 "1n5fbwwz51fdzvjackgmnsgh363g9inyxv7kmzi0469cwavwcx5m"))))
      (build-system gnu-build-system)
      (native-inputs
       (list (chez-scheme-for-system)
             chez-web
             (texlive-updmap.cfg (list texlive-pdftex))))
      (arguments
       (list
        #:tests? #f ; no tests
        #:phases
        #~(modify-phases %standard-phases
            (replace 'configure
              (lambda* (#:key native-inputs inputs #:allow-other-keys)
                (let* ((scheme (search-input-file (or native-inputs inputs)
                                                  "/bin/scheme"))
                       (lib (string-append (dirname scheme) "/../lib"))
                       (header-file (car (find-files lib "scheme\\.h")))
                       (include-dir (dirname header-file)))
                  (substitute* "Makefile"
                    (("(SCHEMEH=).*$" _ var)
                     (string-append var include-dir))))))
            (add-before 'build 'tangle
              (lambda* (#:key inputs #:allow-other-keys)
                (setenv "TEXINPUTS"
                        (string-append
                         (getcwd) ":"
                         (assoc-ref inputs "chez-web")
                         "/share/texmf-local/tex/generic:"
                         ":"))
                ;; just using "make" tries to build the .c files before
                ;; they are created.
                (and (invoke "make" "sockets")
                     (invoke "make"))))
            (replace 'build
              (lambda args
                (let ((chez-site (string-append #$output
                                                "/lib/chez-scheme/arcfide")))
                  ;; make sure Chez Scheme can find the shared libraries.
                  (substitute* "sockets.ss"
                    (("(object \")(socket-ffi-values\\.[sd][oy][^\"]*)(\")"
                      _ pre file post)
                     (string-append pre chez-site "/" file post))
                    (("(\")(sockets-stub\\.[sd][oy][^\"]*)(\")"
                      _ pre file post)
                     (string-append pre chez-site "/" file post)))
                  ;; to compile chez-sockets, the .so files must be
                  ;; installed (because of the absolute path we
                  ;; inserted above).
                  (for-each (lambda (f)
                              (install-file f chez-site))
                            '("socket-ffi-values.so"
                              "sockets-stub.so"))
                  (invoke "bash"
                          "-c"
                          (format #f "echo '~s' | scheme -q"
                                  '(compile-file "sockets.sls"))))))
            (replace 'install
              (lambda args
                (install-file "sockets.so"
                              (string-append #$output
                                             "/lib/chez-scheme/arcfide"))
                (install-file "sockets.pdf"
                              (string-append #$output
                                             "/share/doc/"
                                             #$name "-" #$version)))))))
      (home-page "https://github.com/arcfide/chez-sockets")
      (synopsis "Extensible sockets library for Chez Scheme")
      (description "Chez-sockets is an extensible sockets library for
Chez Scheme.")
      (license expat))))

(define-public chez-matchable
  (package
    (name "chez-matchable")
    (version "20160306")
    (home-page "https://github.com/fedeinthemix/chez-matchable")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url home-page)
             (commit (string-append "v" version))))
       (sha256
        (base32 "02qn7x348p23z1x5lwhkyj7i8z6mgwpzpnwr8dyina0yzsdkr71s"))
       (file-name (git-file-name name version))))
    (build-system gnu-build-system)
    (inputs
     (list chez-srfi)) ; for tests
    (native-inputs
     (list (chez-scheme-for-system)))
    (arguments
     (list #:make-flags (chez-make-flags name version)
           #:test-target "test"
           #:phases #~(modify-phases %standard-phases
                        (replace 'configure
                          #$chez-configure))))
    (synopsis "Portable hygienic pattern matcher for Scheme")
    (description "This package provides a superset of the popular Scheme
@code{match} package by Andrew Wright, written in fully portable
@code{syntax-rules} and thus preserving hygiene.")
    (license public-domain)))

(define-public chez-irregex
  (package
    (name "chez-irregex")
    (version "0.9.4")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url "https://github.com/fedeinthemix/chez-irregex")
             (commit (string-append "v" version))))
       (sha256
        (base32 "0jh6piylw545j81llay9wfivgpv6lcnwd81gm4w17lkasslir50q"))
       (file-name (git-file-name name version))))
    (build-system gnu-build-system)
    (inputs
     (list chez-matchable)) ; for tests
    (propagated-inputs
     (list chez-srfi)) ; for irregex-utils
    (native-inputs
     (list (chez-scheme-for-system)))
    (arguments
     (list #:make-flags (chez-make-flags name version)
           #:test-target "test"
           #:phases #~(modify-phases %standard-phases
                        (replace 'configure
                          #$chez-configure))))
    (home-page "https://github.com/fedeinthemix/chez-irregex")
    (synopsis "Portable regular expression library for Scheme")
    (description "This package provides a portable and efficient
R[4567]RS implementation of regular expressions, supporting both POSIX
syntax with various (irregular) PCRE extensions, as well as SCSH's SRE
syntax, with various aliases for commonly used patterns.")
    (license bsd-3)))

(define-public chez-fmt
  (package
    (name "chez-fmt")
    (version "0.8.11")
    (source
     (origin
       (method url-fetch)
       (uri (string-append
             "http://synthcode.com/scheme/fmt/fmt-" version ".tar.gz"))
       (sha256
        (base32 "1zxqlw1jyg85yzclylh8bp2b3fwcy3l3xal68jw837n5illvsjcl"))
       (file-name (string-append name "-" version ".tar.gz"))))
    (build-system gnu-build-system)
    (propagated-inputs
     (list chez-srfi)) ; for irregex-utils
    (native-inputs
     (list (chez-scheme-for-system)))
    (arguments
     (list #:make-flags (chez-make-flags name version)
           #:test-target "chez-check"
           #:phases
           #~(modify-phases %standard-phases
               (replace 'configure
                 #$chez-configure)
               (replace 'build
                 (lambda* (#:key (make-flags '()) #:allow-other-keys)
                   (apply invoke "make" "chez-build" make-flags)))
               (replace 'install
                 (lambda* (#:key (make-flags '()) #:allow-other-keys)
                   (apply invoke "make" "chez-install" make-flags))))))
    (home-page "http://synthcode.com/scheme/fmt")
    (synopsis "Combinator formatting library for Chez Scheme")
    (description "This package provides a library of procedures for
formatting Scheme objects to text in various ways, and for easily
concatenating, composing and extending these formatters efficiently
without resorting to capturing and manipulating intermediate
strings.")
    (license bsd-3)))

(define-public chez-mit
  (package
    (name "chez-mit")
    (version "0.1")
    (home-page "https://github.com/fedeinthemix/chez-mit")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url home-page)
             (commit (string-append "v" version))))
       (sha256
        (base32 "0c7i3b6i90xk96nmxn1pc9272a4yal4v40dm1a4ybdi87x53zkk0"))
       (file-name (git-file-name name version))
       (snippet
        ;; Workaround for chez-scheme-for-racket.
        ;; See: https://github.com/racket/racket/issues/4151
        #~(begin
            (use-modules (guix build utils))
            (substitute* "mit/core.sls"
              (("[(]import ")
               "(import (only (chezscheme) import)\n")
              (("[(]define string->uninterned-symbol gensym[)]")
               (format #f "~s"
                       '(begin
                          (import (only (chezscheme)
                                        meta-cond
                                        library-exports))
                          (meta-cond
                           ((memq 'string->uninterned-symbol
                                  (library-exports '(chezscheme)))
                            (import (only (chezscheme)
                                          string->uninterned-symbol)))
                           (else
                            (define string->uninterned-symbol
                              gensym)))))))))))
    (build-system gnu-build-system)
    (inputs
     (list chez-srfi))       ; for tests
    (native-inputs
     (list (chez-scheme-for-system)))
    (arguments
     (list #:make-flags (chez-make-flags name version)
           #:test-target "test"
           #:phases #~(modify-phases %standard-phases
                        (replace 'configure
                          #$chez-configure))))
    (synopsis "MIT/GNU Scheme compatibility library for Chez Scheme")
    (description "This package provides a set of MIT/GNU Scheme compatibility
libraries for Chez Scheme.  The main goal was to provide the functionality
required to port the program @code{Scmutils} to Chez Scheme.")
    (license gpl3+)))

(define-public chez-scmutils
  (package
    (name "chez-scmutils")
    (version "0.1")
    (home-page "https://github.com/fedeinthemix/chez-scmutils")
    (source
     (origin
       (method git-fetch)
       (uri (git-reference
             (url home-page)
             (commit (string-append "v" version))))
       (sha256
        (base32 "0lb05wlf8qpgg8y0gdsyaxg1nbfx1qbaqdjvygrp64ndn8fnhq7l"))
       (file-name (git-file-name name version))))
    (build-system gnu-build-system)
    (inputs
     (list chez-srfi))       ; for tests
    (native-inputs
     (list (chez-scheme-for-system)))
    (propagated-inputs
     (list chez-mit chez-srfi))
    (arguments
     (list
      #:make-flags (chez-make-flags name version)
      #:tests? #f  ; no test suite
      #:phases
      #~(modify-phases %standard-phases
          (replace 'configure
            #$chez-configure)
          ;; Since the documentation is lacking, we install the source
          ;; code.  For things to work correctly we have to replace
          ;; relative paths by absolute ones in 'include' forms.  This
          ;; in turn requires us to compile the files in the final
          ;; destination.
          (delete 'build)
          (add-after 'install 'install-src
            (lambda* (#:key (make-flags '()) #:allow-other-keys)
              (apply invoke "make" "install-src" make-flags)))
          (add-after 'install-src 'absolute-path-in-scm-files
            (lambda* (#:key #:allow-other-keys)
              (for-each (lambda (file)
                          (substitute* file
                            (("include +\"\\./scmutils")
                             (string-append "include \"" (dirname file)))))
                        (find-files #$output "\\.sls"))
              (for-each (lambda (file)
                          (substitute* file
                            (("include +\"\\./scmutils/simplify")
                             (string-append "include \"" (dirname file)))))
                        (find-files #$output "fbe-syntax\\.scm"))))
          (add-after 'absolute-path-in-scm-files 'build
            (lambda* (#:key (make-flags '()) #:allow-other-keys)
              (let ((mk-file (car (find-files #$output "Makefile"))))
                (with-directory-excursion (dirname mk-file)
                  (apply invoke "make" "build" make-flags)))))
          (add-after 'build 'clean-up
            (lambda args
              (for-each delete-file
                        (find-files #$output
                                    "Makefile|compile-all\\.ss")))))))
    (synopsis "Port of MIT/GNU Scheme Scmutils to Chez Scheme")
    (description "This package provides a port of the MIT/GNU Scheme
Scmutils program to Chez Scheme.  The port consists of a set of
libraries providing most of the functionality of the original.")
    (license gpl3+)))