gnu: Add shakespeare-spl.

* gnu/packages/patches/shakespeare-spl-fix-grammar.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it here.
* gnu/packages/esolangs.scm (shakespeare-spl): New variable.

gnu/local.mk

@@ -1613,6 +1613,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/seed-webkit.patch			\
   %D%/packages/patches/seq24-rename-mutex.patch			\
   %D%/packages/patches/serf-python3.patch			\
+  %D%/packages/patches/shakespeare-spl-fix-grammar.patch		\
   %D%/packages/patches/sharutils-CVE-2018-1000097.patch		\
   %D%/packages/patches/shadow-hurd-pctrl.patch			\
   %D%/packages/patches/shishi-fix-libgcrypt-detection.patch	\

gnu/packages/esolangs.scm

@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2020 Hendursaga <hendursaga@yahoo.com>
+;;; Copyright © 2020 Leo Prikler <leo.prikler@student.tugraz.at>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -17,8 +18,13 @@
 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
 
 (define-module (gnu packages esolangs)
+  #:use-module (gnu packages)
+  #:use-module (gnu packages bison)
+  #:use-module (gnu packages flex)
   #:use-module (gnu packages ncurses)
   #:use-module (guix build-system cmake)
+  #:use-module (guix build-system copy)
+  #:use-module (guix build-system gnu)
   #:use-module (guix download)
   #:use-module (guix git-download)
   #:use-module ((guix licenses) #:prefix license:)
@@ -49,3 +55,42 @@ (define-public cfunge
 written in C.  It supports several @dfn{fingerprints} (opt-in language extensions
 identified by unique ID codes).")
     (license license:gpl3)))
+
+(define-public shakespeare-spl
+  (package
+    (name "shakespeare-spl")
+    (version "1.2.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://sourceforge/shakespearelang/spl-"
+                                  version ".tar.gz"))
+              (sha256
+               (base32
+                "1lxpfhv01kcwy4l4xgx7j765g8g0v74jns0cr908nfw55h5fy1hj"))
+              (patches
+               (search-patches
+                "shakespeare-spl-fix-grammar.patch"))))
+    (build-system copy-build-system)
+    (arguments
+     `(#:imported-modules (,@%gnu-build-system-modules
+                           (guix build copy-build-system))
+       #:modules ((guix build copy-build-system)
+                  ((guix build gnu-build-system) #:prefix gnu:)
+                  (guix build utils))
+       #:install-plan '(("spl/bin" "bin")
+                        ("spl/lib" "lib")
+                        ("spl/include" "include"))
+       #:phases
+       (modify-phases %standard-phases
+         (add-before 'install 'build
+           (assoc-ref gnu:%standard-phases 'build)))))
+    (native-inputs
+     `(("bison" ,bison)
+       ("flex" ,flex)))
+    (home-page "http://shakespearelang.sourceforge.net/")
+    (synopsis "Write programs like Shakespearean plays")
+    (description "Shakespeare is a programming language with the design goal
+of making programs read like plays.  The characters in the play are variables.
+If you want to assign a character, let's say Juliet, a positive value, you put
+her and another character on the stage and let that character praise Juliet.")
+    (license license:gpl2+)))

gnu/packages/patches/shakespeare-spl-fix-grammar.patch

@@ -0,0 +1,16 @@
+ROMAN_HUNDREDS, ROMAN_TENS and ROMAN_ONES seem to use syntax, that is not
+recognized (any longer?) by flex, so let's expand their definitions.
+
+Index: spl-1.2.1/include/roman_numbers.metaflex
+===================================================================
+--- spl-1.2.1.orig/include/roman_numbers.metaflex
++++ spl-1.2.1/include/roman_numbers.metaflex
+@@ -1,5 +1,5 @@
+ ROMAN_THOUSANDS m+
+-ROMAN_HUNDREDS  (c(d|m)|dc{0,3}|c{1,3})
+-ROMAN_TENS      (x(l|c)|lx{0,3}|x{1,3})
+-ROMAN_ONES      (i(v|x)|vi{0,3}|i{1,3})
++ROMAN_HUNDREDS  (c(d|m|c?c?)|dc?c?c?)
++ROMAN_TENS      (x(l|c|x?x?)|lx?x?x?)
++ROMAN_ONES      (i(v|x|i?i?)|vi?i?i?)
+ ROMAN_NUMBER    {ROMAN_ONES}|{ROMAN_TENS}{ROMAN_ONES}?|{ROMAN_HUNDREDS}{ROMAN_TENS}?{ROMAN_ONES}?|{ROMAN_THOUSANDS}{ROMAN_HUNDREDS}?{ROMAN_TENS}?{ROMAN_ONES}?