gnu: Add piet-toolchain.

* gnu/packages/piet.scm (piet-toolchain): New public variable.

gnu/packages/piet.scm

@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2020 Jesse Gibbons <jgibbons2357+guix@gmail.com>
+;;; Copyright © 2020 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -19,11 +20,14 @@
 (define-module (gnu packages piet)
   #:use-module (guix packages)
   #:use-module (guix download)
+  #:use-module (guix git-download)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix build-system gnu)
   #:use-module (gnu packages gd)
   #:use-module (gnu packages groff)
   #:use-module (gnu packages image)
+  #:use-module (gnu packages netpbm)
+  #:use-module (gnu packages perl)
   #:use-module (gnu packages tcl))
 
 (define-public npiet
@@ -68,3 +72,106 @@ algol-like language
 @end enumerate")
     (home-page "https://www.bertnase.de/npiet/")
     (license license:gpl2+)))
+
+(define-public piet-toolchain
+  (let ((commit "f002ff6a924a6bbace5eef94f3be06f425e7f590")
+        (revision "0"))
+    (package
+      (name "piet-toolchain")
+      (version (git-version "0.0.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/sl236/Piet")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "0xwbhwizfbn080fmrgavaz3b939brycmlar3m5px9avl2b68c816"))
+         (modules '((guix build utils)))
+         (snippet
+          '(begin
+             ;; Remove a bundled fork of Marc Majcher's Piet interpreter.
+             (delete-file-recursively "interpreter")
+             #t))))
+      (build-system gnu-build-system)
+      (arguments
+       `(#:modules ((guix build gnu-build-system)
+                    (guix build utils)
+                    (srfi srfi-26))
+         #:phases
+         (modify-phases %standard-phases
+           (delete 'configure)          ; no configure script
+           (delete 'build)              ; nothing to build
+           (delete 'check)              ; run our own tests below
+           (replace 'install
+             (lambda* (#:key outputs #:allow-other-keys)
+               (let* ((out (assoc-ref outputs "out"))
+                      (bin (string-append out "/bin"))
+                      (doc (string-append out "/share/doc/"
+                                          ,name "-" ,version)))
+                 (for-each (lambda (script)
+                             (install-file script bin)
+                             (wrap-program (string-append bin "/" script)
+                               `("PERL5LIB" ":" = (,(getenv "PERL5LIB")))))
+                           (list "piet-assembler"
+                                 "piet-compiler"))
+
+                 ;; Fix an odd mode.
+                 (chmod "compiler-samples/test-binary-ops.script" #o644)
+                 (for-each (lambda (file)    ; INSTALL-FILE is not recursive
+                             (copy-recursively file
+                                               (string-append doc "/" file)))
+                           (list "assembler-samples"
+                                 "compiler-samples"
+                                 "README.md")) ; includes the licence grant
+                 #t)))
+           (add-after 'install 'check
+             (lambda* (#:key outputs tests? #:allow-other-keys)
+               (let* ((out (assoc-ref outputs "out"))
+                      (bin (string-append out "/bin")))
+                 (when tests?
+                   (unsetenv "PERL5LIB") ; test the wrapping
+                   ;; Compile all scripts assemble all Piets.
+                   (for-each (lambda (file)
+                               (system (string-append bin "/piet-compiler "
+                                                      file ">"
+                                                      file ".piet")))
+                             (find-files "." "\\.script$"))
+                   (for-each (lambda (file)
+                               (system (string-append bin "/piet-assembler "
+                                                      file "|pnmtopng>"
+                                                      file ".png")))
+                             (find-files "." "\\.piet$"))
+
+                   ;; Don't run the interactive one.
+                   (delete-file "assembler-samples/quest.piet.png")
+                   (for-each (cut invoke "npiet" <>)
+                             (find-files "." "\\.png$"))
+                   #t)))))))
+      (native-inputs
+       ;; For our tests.
+       `(("netpbm" ,netpbm)
+         ("npiet" ,npiet)))
+      (inputs
+       `(("perl" ,perl)
+         ("perl-parse-recdescent" ,perl-parse-recdescent)))
+      (home-page "https://www.toothycat.net/wiki/wiki.pl?MoonShadow/Piet")
+      (synopsis "Piet compiler and assembler")
+      (description
+       "This package provides a compiler and assembler that target the Piet
+graphical programming language.
+
+@command{piet-assembler} converts Piet assembler instructions (e.g.,
+@code{push}, @code{add}, @code{switch}, @code{outn}) and directives into an
+executable @code{netpbm} image of the corresponding Piet program.
+
+@command{piet-compiler} compiles a C-like high-level language into assembly
+source understood by @command{piet-assembler}.  It supports common arithmetic
+and boolean logic operators (though not bitwise manipulation), flow control
+(@code{if}, @code{for}, @code{while}), recursive functions, in-line assembler,
+and input/output intrinsics.  The only supported data type is the integer.
+
+The language is documented only by the compiler's Perl source code and the
+included samples.")
+      (license license:cc-by-sa4.0))))