;;; 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 (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)
  #:export (nix-system->chez-machine
            chez-machine->nonthreaded
            chez-machine->threaded))

(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-public nanopass
  (let ((version "1.9.2"))
    (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" version)))))

(define stex
  ;; 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")
         (version "1.2.2")
         (version (git-version version "1" commit)))
    (origin
      (method git-fetch)
      (uri (git-reference
            (url "https://github.com/dybvig/stex")
            (commit commit)))
      (sha256 (base32 "01jnvw8qw33gnpzwrakwhsr05h6b609lm180jnspcrb7lds2p23d"))
      (file-name (git-file-name "stex" version)))))

(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))
                           (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 nanopass ; source only
           ;; for docs
           stex
           xorg-rgb
           (texlive-updmap.cfg (list texlive-dvips-l3backend
                                     texlive-epsf
                                     texlive-fonts-ec
                                     texlive-oberdiek))
           ghostscript
           netpbm))
    (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
              (copy-recursively #$nanopass
                                "nanopass"
                                #:keep-mtime? #t)
              (copy-recursively #$stex
                                "stex"
                                #:keep-mtime? #t)))
          ;; 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 explicitly lets us avoid using substitute*
          ;; to re-write makefiles.
          (add-after 'install-symlink 'prepare-stex
            (lambda* (#:key native-inputs inputs outputs #:allow-other-keys)
              ;; Eventually we want to install stex as a real
              ;; package so it's reusable. For now:
              (let* ((stex-output "/tmp")
                     (doc-dir (string-append stex-output "/share/doc/stex")))
                (with-directory-excursion "stex"
                  (invoke "make"
                          "install"
                          (string-append "LIB="
                                         stex-output
                                         "/lib/stex")
                          (string-append "Scheme="
                                         (search-input-file outputs
                                                            "/bin/scheme")))
                  (for-each (lambda (pth)
                              (install-file pth doc-dir))
                            '("ReadMe" ; includes the license
                              "doc/stex.html"
                              "doc/stex.css"
                              "doc/stex.pdf"))))))
          ;; Building the documentation requires stex and a running scheme.
          ;; FIXME: this is probably wrong for cross-compilation
          (add-after 'prepare-stex '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 "/tmp/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-bootstrap-bootfiles
  (package
    (name "chez-scheme-for-racket-bootstrap-bootfiles")
    (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 `())
    (native-inputs (list racket-vm-bc))
    (build-system copy-build-system)
    ;; TODO: cross compilation
    (arguments
     (list
      #:install-plan
      #~`(("boot/" "lib/chez-scheme-bootfiles"))
      #:phases
      #~(let ((unpack (assoc-ref %standard-phases 'unpack)))
          (modify-phases %standard-phases
            (replace 'unpack
              (lambda args
                (unpack #:source #$(or (package-source this-package)
                                       (package-source racket-vm-bc)))))
            (add-after 'unpack 'chdir
              (lambda args
                (chdir "racket/src/ChezScheme")))
            (add-after 'chdir 'unpack-nanopass+stex
              (lambda args
                (copy-recursively
                 #$nanopass
                 "nanopass"
                 #:keep-mtime? #t)))
            (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 (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 "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.")
    (license (list asl2.0))))

;;
;; 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))
    (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
             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
             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))
    (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))
    (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))
    (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))))
    (build-system gnu-build-system)
    (inputs
     (list chez-srfi))       ; for tests
    (native-inputs
     (list chez-scheme))
    (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))
    (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+)))