Moved enable_attributes keyword to extension: legacy_attrs.

If you have existing documents that use the legacy attributes format,
then you should enable the legacy_attrs extension for those documents.
Everyone is encouraged to use the attr_list extension going forward.
Closes #643. Work adapted from 0005d7a of the md3 branch.

1 files changed, 48 insertions, 0 deletions

diff --git a/tests/test_syntax/extensions/test_legacy_attrs.py b/tests/test_syntax/extensions/test_legacy_attrs.py
new file mode 100644
index 0000000..506fce8
--- /dev/null
+++ b/tests/test_syntax/extensions/test_legacy_attrs.py
@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+from markdown.test_tools import TestCase
+
+
+class TestLegacyAtrributes(TestCase):
+
+    maxDiff = None
+
+    def testLegacyAttrs(self):
+        self.assertMarkdownRenders(
+            self.dedent("""
+                # Header {@id=inthebeginning}
+
+                Now, let's try something *inline{@class=special}*, to see if it works
+
+                @id=TABLE.OF.CONTENTS}
+
+
+                * {@id=TABLEOFCONTENTS}
+
+
+                Or in the middle of the text {@id=TABLEOFCONTENTS}
+
+                {@id=tableofcontents}
+
+                [![{@style=float: left; margin: 10px; border:
+                none;}](http://fourthought.com/images/ftlogo.png "Fourthought
+                logo")](http://fourthought.com/)
+
+                ![img{@id=foo}][img]
+
+                [img]: http://example.com/i.jpg
+            """),
+            self.dedent("""
+                <h1 id="inthebeginning">Header </h1>
+                <p>Now, let's try something <em class="special">inline</em>, to see if it works</p>
+                <p>@id=TABLE.OF.CONTENTS}</p>
+                <ul>
+                <li id="TABLEOFCONTENTS"></li>
+                </ul>
+                <p id="TABLEOFCONTENTS">Or in the middle of the text </p>
+                <p id="tableofcontents"></p>
+                <p><a href="http://fourthought.com/"><img alt="" src="http://fourthought.com/images/ftlogo.png" style="float: left; margin: 10px; border: none;" title="Fourthought logo" /></a></p>
+                <p><img alt="img" id="foo" src="http://example.com/i.jpg" /></p>
+            """),  # noqa: E501
+            extensions=['legacy_attrs']
+        )