Add support for GitHub syntax of alerts/admonitions

md2conf/converter.py

@@ -503,6 +503,48 @@ def _transform_admonition(self, elem: ET._Element) -> ET._Element:
             *content,
         )
 
+    def _transform_alert(self, elem: ET._Element) -> ET._Element:
+        """
+        Creates an info, tip, note or warning panel from a GitHub alert.
+
+        Transforms
+        [GitHub alert](https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#alerts)  # noqa: E501 # no way to make this link shorter
+        syntax into one of the Confluence structured macros *info*, *tip*, *note*, or *warning*.
+        """
+
+        content = elem[0]
+        pattern = re.compile(r"^\[!([A-Z]+)\]\s*")
+        match = pattern.match(content.text or "")
+        if match is None:
+            raise DocumentError("not an alert")
+        alert = match.group(1)
+
+        if alert == "NOTE":
+            class_name = "note"
+        elif alert == "TIP":
+            class_name = "tip"
+        elif alert == "IMPORTANT":
+            class_name = "tip"
+        elif alert == "WARNING":
+            class_name = "warning"
+        elif alert == "CAUTION":
+            class_name = "warning"
+        else:
+            raise DocumentError(f"unsupported alert: {alert}")
+
+        for e in elem:
+            self.visit(e)
+
+        content.text = pattern.sub("", content.text, count=1)
+        return AC(
+            "structured-macro",
+            {
+                ET.QName(namespaces["ac"], "name"): class_name,
+                ET.QName(namespaces["ac"], "schema-version"): "1",
+            },
+            AC("rich-text-body", {}, *list(elem)),
+        )
+
     def _transform_section(self, elem: ET._Element) -> ET._Element:
         """
         Creates a collapsed section.
@@ -569,6 +611,18 @@ def transform(self, child: ET._Element) -> Optional[ET._Element]:
         elif child.tag == "div" and "admonition" in child.attrib.get("class", ""):
             return self._transform_admonition(child)
 
+        # Alerts in GitHub
+        # <blockquote>
+        #   <p>[!TIP] ...</p>
+        # </blockquote>
+        elif (
+            child.tag == "blockquote"
+            and len(child) > 0
+            and child[0].tag == "p"
+            and child[0].text.startswith("[!")
+        ):
+            return self._transform_alert(child)
+
         # <details markdown="1">
         # <summary>...</summary>
         # ...

tests/source/alert.md

@@ -0,0 +1,28 @@
+<!-- confluence-page-id: 00000000000 -->
+
+## Alerts
+
+Note:
+
+> [!NOTE]
+> Useful information that users should know, even when skimming content.
+
+Tip:
+
+> [!TIP]
+> Helpful advice for doing things better or more easily.
+
+Important:
+
+> [!IMPORTANT]
+> Key information users need to know to achieve their goal.
+
+Warning:
+
+> [!WARNING]
+> Urgent info that needs immediate user attention to avoid problems.
+
+Caution:
+
+> [!CAUTION]
+> Advises about risks or negative outcomes of certain actions.

tests/target/alert.xml

@@ -0,0 +1,36 @@
+<ac:structured-macro ac:name="info" ac:schema-version="1">
+  <ac:rich-text-body>
+    <p>This page has been generated with a tool.</p>
+  </ac:rich-text-body>
+</ac:structured-macro>
+<h2>Alerts</h2>
+<p>Note:</p>
+<ac:structured-macro ac:name="note" ac:schema-version="1">
+  <ac:rich-text-body>
+    <p>Useful information that users should know, even when skimming content.</p>
+  </ac:rich-text-body>
+</ac:structured-macro>
+<p>Tip:</p>
+<ac:structured-macro ac:name="tip" ac:schema-version="1">
+  <ac:rich-text-body>
+    <p>Helpful advice for doing things better or more easily.</p>
+  </ac:rich-text-body>
+</ac:structured-macro>
+<p>Important:</p>
+<ac:structured-macro ac:name="tip" ac:schema-version="1">
+  <ac:rich-text-body>
+    <p>Key information users need to know to achieve their goal.</p>
+  </ac:rich-text-body>
+</ac:structured-macro>
+<p>Warning:</p>
+<ac:structured-macro ac:name="warning" ac:schema-version="1">
+  <ac:rich-text-body>
+    <p>Urgent info that needs immediate user attention to avoid problems.</p>
+  </ac:rich-text-body>
+</ac:structured-macro>
+<p>Caution:</p>
+<ac:structured-macro ac:name="warning" ac:schema-version="1">
+  <ac:rich-text-body>
+    <p>Advises about risks or negative outcomes of certain actions.</p>
+  </ac:rich-text-body>
+</ac:structured-macro>