add jinja2 templating

src/rougail/data/rougail.dtd

@@ -66,11 +66,11 @@
 <!ATTLIST file group CDATA "root">
 <!ATTLIST file filelist CDATA #IMPLIED>
 <!ATTLIST file redefine (True|False) "False">
-<!ATTLIST file engine (none|creole) #IMPLIED>
+<!ATTLIST file engine (none|creole|jinja2) #IMPLIED>
 
 <!ELEMENT override EMPTY>
 <!ATTLIST override source CDATA #IMPLIED>
-<!ATTLIST override engine (none|creole) #IMPLIED>
+<!ATTLIST override engine (none|creole|jinja2) #IMPLIED>
 
 <!ELEMENT variables ((variable*|family*)*)>
 

src/rougail/template/engine/__init__.py

@@ -1,4 +1,4 @@
-from . import none, creole
+from . import none, creole, jinja2
 
 
-__all__ = ('none', 'creole')
+__all__ = ('none', 'creole', 'jinja2')

src/rougail/template/engine/jinja2.py

@@ -0,0 +1,69 @@
+"""Jinja2 engine
+
+Created by:
+EOLE (http://eole.orion.education.fr)
+Copyright (C) 2005-2018
+
+Forked by:
+Cadoles (http://www.cadoles.com)
+Copyright (C) 2021
+
+distribued with GPL-2 or later license
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+"""
+from typing import Any, Dict
+from jinja2 import Environment, FileSystemLoader
+from jinja2.exceptions import UndefinedError
+
+from ...i18n import _
+from ...utils import normalize_family
+from ...error import TemplateError
+
+
+def process(filename: str,
+            source: str,
+            true_destfilename: str,
+            destfilename: str,
+            variable: Any,
+            rougail_variables_dict: Dict,
+            eosfunc: Dict,
+            ):
+    """Process a cheetah template
+    """
+    # full path of the destination file
+    dir_name, template_name = filename.rsplit('/', 1)
+    if source is not None:  # pragma: no cover
+        raise TemplateError(_('source is not supported for jinja2'))
+        rougail_variables_dict['rougail_variable'] = variable
+    if variable is not None:
+        var = {'rougail_variable': variable}
+    else:
+        var = {}
+    try:
+        # extra_context = {'normalize_family': normalize_family,
+        # eosfunc
+        env = Environment(loader=FileSystemLoader(dir_name))
+        template = env.get_template(template_name)
+        data = template.render(**rougail_variables_dict, rougail_filename=true_destfilename, **var)
+    except UndefinedError as err:  # pragma: no cover
+        varname = err
+        msg = f"Error: unknown variable used in template {filename} to {destfilename}: {varname}"
+        raise TemplateError(_(msg)) from err
+
+    if not data.endswith('\n'):
+        data = data + '\n'
+    with open(destfilename, 'w') as file_h:
+        file_h.write(data)