🐛 FIX: Ruler.at (#146)

and add basic plugin creation tests
(that don't rely on mdit_py_plugins)

Author: chrisjsewell

markdown_it/ruler.py

@@ -116,7 +116,7 @@ def at(self, ruleName: str, fn: RuleFunc, options=None):
         if index == -1:
             raise KeyError(f"Parser rule not found: {ruleName}")
         self.__rules__[index].fn = fn
-        self.__rules__[index].alt = options["alt"] or []
+        self.__rules__[index].alt = options.get("alt", [])
         self.__cache__ = None
 
     def before(self, beforeName: str, ruleName: str, fn: RuleFunc, options=None):

tests/test_api/test_plugin_creation.py

@@ -0,0 +1,88 @@
+"""Test basic plugin creation functionality:
+that they can be added and are called correctly
+"""
+from markdown_it import MarkdownIt
+
+
+def inline_rule(state, silent):
+    print("plugin called")
+
+
+def test_inline_after(capsys):
+    def _plugin(_md):
+        _md.inline.ruler.after("text", "new_rule", inline_rule)
+
+    MarkdownIt().use(_plugin).parse("[")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_inline_before(capsys):
+    def _plugin(_md):
+        _md.inline.ruler.before("text", "new_rule", inline_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_inline_at(capsys):
+    def _plugin(_md):
+        _md.inline.ruler.at("text", inline_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def block_rule(state, startLine, endLine, silent):
+    print("plugin called")
+
+
+def test_block_after(capsys):
+    def _plugin(_md):
+        _md.block.ruler.after("hr", "new_rule", block_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_block_before(capsys):
+    def _plugin(_md):
+        _md.block.ruler.before("hr", "new_rule", block_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_block_at(capsys):
+    def _plugin(_md):
+        _md.block.ruler.at("hr", block_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def core_rule(state):
+    print("plugin called")
+
+
+def test_core_after(capsys):
+    def _plugin(_md):
+        _md.core.ruler.after("normalize", "new_rule", core_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_core_before(capsys):
+    def _plugin(_md):
+        _md.core.ruler.before("normalize", "new_rule", core_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out
+
+
+def test_core_at(capsys):
+    def _plugin(_md):
+        _md.core.ruler.at("normalize", core_rule)
+
+    MarkdownIt().use(_plugin).parse("a")
+    assert "plugin called" in capsys.readouterr().out