gnu: Add texlive-ruhyphen.

* gnu/packages/tex.scm (texlive-ruhyphen): New variable.

gnu/packages/tex.scm

@@ -66,6 +66,7 @@
   #:use-module (gnu packages ruby)
   #:use-module (gnu packages shells)
   #:use-module (gnu packages base)
+  #:use-module (gnu packages gawk)
   #:use-module (gnu packages web)
   #:use-module (gnu packages xml)
   #:use-module (gnu packages xorg)
@@ -2512,6 +2513,45 @@ Ukrainian, depending on the encoding of the output font including the standard
 T2A.")
     (license license:lppl)))
 
+(define-public texlive-ruhyphen
+  (let ((template (simple-texlive-package
+                   "texlive-ruhyphen"
+                   (list "/source/generic/ruhyphen/"
+                         "/tex/generic/ruhyphen/")
+                   (base32
+                    "18n1bqhh8jv765vz3a3fjwffy7m71vhwx9yq8zl0p5j7p72q9qcn")
+                   #:trivial? #t)))
+    (package
+      (inherit template)
+      (arguments
+       (substitute-keyword-arguments (package-arguments template)
+         ((#:phases phases)
+          `(modify-phases ,phases
+             (replace 'build
+               (lambda _
+                 (let ((cwd (getcwd)))
+                   ;; Remove generated files.
+                   (for-each delete-file
+                             (find-files "tex/generic/ruhyphen/"
+                                         "^cyry.*.tex$"))
+                   (substitute* "source/generic/ruhyphen/Makefile"
+                     (("./mkcyryo") (string-append cwd "/source/generic/ruhyphen/mkcyryo")))
+                   (with-directory-excursion "tex/generic/ruhyphen"
+                     (invoke "make" "-f"
+                             (string-append cwd "/source/generic/ruhyphen/Makefile"))))))))))
+      (native-inputs
+       `(("coreutils" ,coreutils)
+         ("gawk" ,gawk)
+         ("sed" ,sed)
+         ("grep" ,grep)
+         ("perl" ,perl)))
+      (home-page "https://www.ctan.org/pkg/ruhyphen")
+      (synopsis "Hyphenation patterns for Russian")
+      (description "The package provides a collection of Russian hyphenation
+patterns supporting a number of Cyrillic font encodings, including T2,
+UCY (Omega Unicode Cyrillic), LCY, LWN (OT2), and koi8-r.")
+      (license license:lppl))))
+
 (define-public texlive-latex-base
   (let ((texlive-dir
          (lambda (dir hash)