From: Matthijs Kooijman <matthijs@stdio.flexvps.nl>
Date: Fri, 8 Feb 2008 23:01:14 +0000 (+0100)
Subject:  * Add the gapless template tag from http://www.djangosnippets.org/snippets/569/.
X-Git-Url: https://git.stderr.nl/gitweb?p=matthijs%2Fprojects%2Fxerxes.git;a=commitdiff_plain;h=d0e331d60ba2c49680a1f012bb8b81e0ea7c3608

 * Add the gapless template tag from djangosnippets.org/snippets/569/.
---

diff --git a/tools/templatetags/__init__.py b/tools/templatetags/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tools/templatetags/gapless.py b/tools/templatetags/gapless.py
new file mode 100644
index 0000000..9defba5
--- /dev/null
+++ b/tools/templatetags/gapless.py
@@ -0,0 +1,45 @@
+import re
+
+from django.utils.functional import allow_lazy
+from django.utils.encoding import force_unicode
+from django.template import Node, Library
+
+register = Library()
+
+def strip_empty_lines(value):
+    """Return the given HTML with empty and all-whitespace lines removed."""
+    return re.sub(r'\n[ \t]*(?=\n)', '', force_unicode(value))
+strip_empty_lines = allow_lazy(strip_empty_lines, unicode)
+
+class GaplessNode(Node):
+    def __init__(self, nodelist):
+        self.nodelist = nodelist
+
+    def render(self, context):
+        return strip_empty_lines(self.nodelist.render(context).strip())
+
+def gapless(parser, token):
+    """
+    Remove empty and whitespace-only lines.  Useful for getting rid of those
+    empty lines caused by template lines with only template tags and possibly
+    whitespace.
+
+    Example usage::
+
+        <p>{% gapless %}
+          {% if yepp %}
+            <a href="foo/">Foo</a>
+          {% endif %}
+        {% endgapless %}</p>
+
+    This example would return this HTML::
+
+        <p>
+            <a href="foo/">Foo</a>
+        </p>
+
+    """
+    nodelist = parser.parse(('endgapless',))
+    parser.delete_first_token()
+    return GaplessNode(nodelist)
+gapless = register.tag(gapless)