gnu: Add python-pandocfilters.

* gnu/packages/textutils.scm (python-pandocfilters): New variable.

gnu/packages/textutils.scm

@@ -851,3 +851,28 @@ Mainland China, Taiwan, and Hong-Kong.")
 hosts and terminals.  It converts input kanji code to designated kanji code
 such as ISO-2022-JP, Shift_JIS, EUC-JP, UTF-8, UTF-16 or UTF-32.")
       (license license:zlib))))
+
+(define-public python-pandocfilters
+  (package
+    (name "python-pandocfilters")
+    (version "1.4.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "pandocfilters" version))
+       (sha256
+        (base32
+         "1a8d9b7s48gmq9zj0pmbyv2sivn5i7m6mybgpkk4jm5vd7hp1pdk"))))
+    (build-system python-build-system)
+    (home-page "https://github.com/jgm/pandocfilters")
+    (synopsis "Python module for writing Pandoc filters")
+    (description "Pandoc is a powerful utility to transform various
+input formats into a wide range of output formats.  To alter the
+exported output document, Pandoc allows the usage of filters, which
+are pipes that read a JSON serialization of the Pandoc AST from stdin,
+transform it in some way, and write it to stdout.  It allows therefore
+to alter the processing of Pandoc's supported input formats, for
+instance one can add new syntax elements to markdown, etc.
+
+This package provides Python bindings.")
+    (license license:bsd-3)))