gnu: Add texlive-latexdemo.

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

gnu/packages/tex.scm

@@ -86699,6 +86699,28 @@ (define-public texlive-latexcolors
 typeset with LaTeX and friends.")
     (license license:lppl1.3+)))
 
+(define-public texlive-latexdemo
+  (package
+    (name "texlive-latexdemo")
+    (version (number->string %texlive-revision))
+    (source (texlive-origin
+             name version
+             (list "doc/latex/latexdemo/"
+                   "source/latex/latexdemo/"
+                   "tex/latex/latexdemo/")
+             (base32
+              "0d3bxwcd98n9ij3jikm7zci1j15nhds5nhrk8vifsi04l4wgh8ls")))
+    (outputs '("out" "doc"))
+    (build-system texlive-build-system)
+    (home-page "https://ctan.org/pkg/latexdemo")
+    (synopsis "Demonstrate LaTeX code with its resulting output")
+    (description
+     "The package provides configurable tools to print out LaTeX code and the
+resulting output in the same document.  It also supports printing the result
+inside a conditional sequence; thus one may suppress printing if the code
+would not compile.")
+    (license license:lppl1.3+)))
+
 ;;;
 ;;; Avoid adding new packages to the end of this file. To reduce the chances
 ;;; of a merge conflict, place them above by existing packages with similar