gnu: Add python-genshi.

* gnu/packages/python.scm (python-genshi, python2-genshi): New variables.
 * gnu/packages/patches/python-genshi-add-support-for-python-3.4-AST.patch: New file.
 * gnu/packages/patches/python-genshi-buildable-on-python-2.7.patch: New file.
 * gnu/packages/patches/python-genshi-disable-speedups-on-python-3.3.patch: New file.
 * gnu/packages/patches/python-genshi-fix-tests-on-python-3.5.patch: New file.
 * gnu/packages/patches/python-genshi-isstring-helper.patch: New file.
 * gnu/packages/patches/python-genshi-stripping-of-unsafe-script-tags.patch: New file.
 * gnu/local.mk (dist_patch_DATA): Add them.

Signed-off-by: Arun Isaac <arunisaac@systemreboot.net>

gnu/packages/patches/python-genshi-fix-tests-on-python-3.5.patch

@@ -0,0 +1,112 @@
+From ce796ad4bae5c47011876778674ad036357febdf Mon Sep 17 00:00:00 2001
+From: Adriano Peluso <catonano@gmail.com>
+Date: Wed, 5 Apr 2017 15:10:06 +0200
+Subject: [PATCH 1/2] fixing the tests on python35
+
+---
+ genshi/filters/i18n.py        |  6 ++++--
+ genshi/template/astutil.py    | 14 +++++++++++---
+ genshi/template/directives.py | 20 ++++++++++++++------
+ genshi/template/eval.py       |  5 +++++
+ 4 files changed, 34 insertions(+), 11 deletions(-)
+
+diff --git a/genshi/filters/i18n.py b/genshi/filters/i18n.py
+index 526fda4..5387fcf 100644
+--- a/genshi/filters/i18n.py
++++ b/genshi/filters/i18n.py
+@@ -1194,8 +1194,10 @@ def extract_from_code(code, gettext_functions):
+                 elif arg:
+                     strings.append(None)
+             [_add(arg) for arg in node.args]
+-            _add(node.starargs)
+-            _add(node.kwargs)
++            if hasattr(node, 'starargs'):
++                _add(node.starargs)
++            if hasattr(node, 'kwargs'):
++                _add(node.kwargs)
+             if len(strings) == 1:
+                 strings = strings[0]
+             else:
+diff --git a/genshi/template/astutil.py b/genshi/template/astutil.py
+index f4e1edd..e561846 100644
+--- a/genshi/template/astutil.py
++++ b/genshi/template/astutil.py
+@@ -151,6 +151,10 @@ class ASTCodeGenerator(object):
+         def visit_arg(self, node):
+             self._write(node.arg)
+ 
++    def visit_Starred(self, node):
++        self._write('*')
++        self.visit(node.value)
++
+     # FunctionDef(identifier name, arguments args,
+     #                           stmt* body, expr* decorator_list)
+     def visit_FunctionDef(self, node):
+@@ -664,9 +668,13 @@ class ASTCodeGenerator(object):
+             if not first:
+                 self._write(', ')
+             first = False
+-            # keyword = (identifier arg, expr value)
+-            self._write(keyword.arg)
+-            self._write('=')
++            if not keyword.arg:
++                # Python 3.5+ star-star args
++                self._write('**')
++            else:
++                # keyword = (identifier arg, expr value)
++                self._write(keyword.arg)
++                self._write('=')
+             self.visit(keyword.value)
+         if getattr(node, 'starargs', None):
+             if not first:
+diff --git a/genshi/template/directives.py b/genshi/template/directives.py
+index 7301c2d..6fd0f28 100644
+--- a/genshi/template/directives.py
++++ b/genshi/template/directives.py
+@@ -266,13 +266,21 @@ class DefDirective(Directive):
+         if isinstance(ast, _ast.Call):
+             self.name = ast.func.id
+             for arg in ast.args:
+-                # only names
+-                self.args.append(arg.id)
++                if isinstance(arg, _ast.Starred):
++                    # Python 3.5+
++                    self.star_args = arg.value.id
++                else:
++                    # only names
++                    self.args.append(arg.id)
+             for kwd in ast.keywords:
+-                self.args.append(kwd.arg)
+-                exp = Expression(kwd.value, template.filepath,
+-                                 lineno, lookup=template.lookup)
+-                self.defaults[kwd.arg] = exp
++                if kwd.arg is None:
++                    # Python 3.5+
++                    self.dstar_args = kwd.value.id
++                else:
++                    self.args.append(kwd.arg)
++                    exp = Expression(kwd.value, template.filepath,
++                                     lineno, lookup=template.lookup)
++                    self.defaults[kwd.arg] = exp
+             if getattr(ast, 'starargs', None):
+                 self.star_args = ast.starargs.id
+             if getattr(ast, 'kwargs', None):
+diff --git a/genshi/template/eval.py b/genshi/template/eval.py
+index d378419..81644a7 100644
+--- a/genshi/template/eval.py
++++ b/genshi/template/eval.py
+@@ -600,6 +600,11 @@ class TemplateASTTransformer(ASTTransformer):
+         finally:
+             self.locals.pop()
+ 
++    # Only used in Python 3.5+
++    def visit_Starred(self, node):
++        node.value = self.visit(node.value)
++        return node
++
+     def visit_Name(self, node):
+         # If the name refers to a local inside a lambda, list comprehension, or
+         # generator expression, leave it alone
+-- 
+2.12.0
+