Add a jinja.render helper

This simplifies some code and will make #1362 possible.

qutebrowser/browser/network/filescheme.py

@@ -70,9 +70,6 @@ def dirbrowser_html(path):
         The HTML of the web page.
     """
     title = "Browse directory: {}".format(path)
-    template = jinja.env.get_template('dirbrowser.html')
-    # pylint: disable=no-member
-    # WORKAROUND for https://bitbucket.org/logilab/pylint/issue/490/
 
     if is_root(path):
         parent = None
@@ -82,18 +79,16 @@ def dirbrowser_html(path):
     try:
         all_files = os.listdir(path)
     except OSError as e:
-        html = jinja.env.get_template('error.html').render(
-            title="Error while reading directory",
-            url='file://{}'.format(path),
-            error=str(e),
-            icon='')
+        html = jinja.render('error.html',
+                            title="Error while reading directory",
+                            url='file://{}'.format(path), error=str(e),
+                            icon='')
         return html.encode('UTF-8', errors='xmlcharrefreplace')
 
     files = get_file_list(path, all_files, os.path.isfile)
     directories = get_file_list(path, all_files, os.path.isdir)
-    html = template.render(title=title, url=path, icon='',
-                           parent=parent, files=files,
-                           directories=directories)
+    html = jinja.render('dirbrowser.html', title=title, url=path, icon='',
+                        parent=parent, files=files, directories=directories)
     return html.encode('UTF-8', errors='xmlcharrefreplace')
 
 

qutebrowser/browser/network/qutescheme.py

@@ -16,12 +16,6 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with qutebrowser.  If not, see <http://www.gnu.org/licenses/>.
-#
-# pylint complains when using .render() on jinja templates, so we make it shut
-# up for this whole module.
-
-# pylint: disable=no-member
-# WORKAROUND for https://bitbucket.org/logilab/pylint/issue/490/
 
 """Handler functions for different qute:... pages.
 
@@ -149,17 +143,16 @@ class JSBridge(QObject):
 @add_handler('pyeval')
 def qute_pyeval(_win_id, _request):
     """Handler for qute:pyeval. Return HTML content as bytes."""
-    html = jinja.env.get_template('pre.html').render(
-        title='pyeval', content=pyeval_output)
+    html = jinja.render('pre.html', title='pyeval', content=pyeval_output)
     return html.encode('UTF-8', errors='xmlcharrefreplace')
 
 
 @add_handler('version')
 def qute_version(_win_id, _request):
     """Handler for qute:version. Return HTML content as bytes."""
-    html = jinja.env.get_template('version.html').render(
-        title='Version info', version=version.version(),
-        copyright=qutebrowser.__copyright__)
+    html = jinja.render('version.html', title='Version info',
+                        version=version.version(),
+                        copyright=qutebrowser.__copyright__)
     return html.encode('UTF-8', errors='xmlcharrefreplace')
 
 
@@ -170,7 +163,7 @@ def qute_plainlog(_win_id, _request):
         text = "Log output was disabled."
     else:
         text = log.ram_handler.dump_log()
-    html = jinja.env.get_template('pre.html').render(title='log', content=text)
+    html = jinja.render('pre.html', title='log', content=text)
     return html.encode('UTF-8', errors='xmlcharrefreplace')
 
 
@@ -181,8 +174,7 @@ def qute_log(_win_id, _request):
         html_log = None
     else:
         html_log = log.ram_handler.dump_log(html=True)
-    html = jinja.env.get_template('log.html').render(
-        title='log', content=html_log)
+    html = jinja.render('log.html', title='log', content=html_log)
     return html.encode('UTF-8', errors='xmlcharrefreplace')
 
 
@@ -198,7 +190,8 @@ def qute_help(win_id, request):
     try:
         utils.read_file('html/doc/index.html')
     except OSError:
-        html = jinja.env.get_template('error.html').render(
+        html = jinja.render(
+            'error.html',
             title="Error while loading documentation",
             url=request.url().toDisplayString(),
             error="This most likely means the documentation was not generated "
@@ -224,9 +217,8 @@ def qute_help(win_id, request):
 def qute_settings(win_id, _request):
     """Handler for qute:settings. View/change qute configuration."""
     config_getter = functools.partial(objreg.get('config').get, raw=True)
-    html = jinja.env.get_template('settings.html').render(
-        win_id=win_id, title='settings', config=configdata,
-        confget=config_getter)
+    html = jinja.render('settings.html', win_id=win_id, title='settings',
+                        config=configdata, confget=config_getter)
     return html.encode('UTF-8', errors='xmlcharrefreplace')
 
 

qutebrowser/browser/webpage.py

@@ -166,10 +166,8 @@ class BrowserPage(QWebPage):
             log.webview.debug("Error domain: {}, error code: {}".format(
                 info.domain, info.error))
             title = "Error loading page: {}".format(urlstr)
-            template = jinja.env.get_template('error.html')
-            # pylint: disable=no-member
-            # WORKAROUND for https://bitbucket.org/logilab/pylint/issue/490/
-            html = template.render(
+            html = jinja.render(
+                'error.html',
                 title=title, url=urlstr, error=error_str, icon='')
             errpage.content = html.encode('utf-8')
             errpage.encoding = 'utf-8'

qutebrowser/utils/jinja.py

@@ -71,5 +71,11 @@ def resource_url(path):
     image = utils.resource_filename(path)
     return QUrl.fromLocalFile(image).toString(QUrl.FullyEncoded)
 
-env = jinja2.Environment(loader=Loader('html'), autoescape=_guess_autoescape)
-env.globals['resource_url'] = resource_url
+
+def render(template, **kwargs):
+    """Render the given template and pass the given arguments to it."""
+    return _env.get_template(template).render(**kwargs)
+
+
+_env = jinja2.Environment(loader=Loader('html'), autoescape=_guess_autoescape)
+_env.globals['resource_url'] = resource_url

tests/unit/utils/test_jinja.py

@@ -46,16 +46,13 @@ def patch_read_file(monkeypatch):
 
 def test_simple_template():
     """Test with a simple template."""
-    template = jinja.env.get_template('test.html')
-    # https://bitbucket.org/logilab/pylint/issue/490/
-    data = template.render(var='World')  # pylint: disable=no-member
+    data = jinja.render('test.html', var='World')
     assert data == "Hello World"
 
 
 def test_resource_url():
     """Test resource_url() which can be used from templates."""
-    template = jinja.env.get_template('test2.html')
-    data = template.render()  # pylint: disable=no-member
+    data = jinja.render('test2.html')
     print(data)
     url = QUrl(data)
     assert url.isValid()
@@ -74,7 +71,7 @@ def test_resource_url():
 def test_not_found():
     """Test with a template which does not exist."""
     with pytest.raises(jinja2.TemplateNotFound) as excinfo:
-        jinja.env.get_template('does_not_exist.html')
+        jinja.render('does_not_exist.html')
     assert str(excinfo.value) == 'does_not_exist.html'
 
 
@@ -86,9 +83,7 @@ def test_utf8():
 
     https://github.com/The-Compiler/qutebrowser/issues/127
     """
-    template = jinja.env.get_template('test.html')
-    # https://bitbucket.org/logilab/pylint/issue/490/
-    data = template.render(var='\u2603')  # pylint: disable=no-member
+    data = jinja.render('test.html', var='\u2603')
     assert data == "Hello \u2603"