.callout-content support (#1188)

* .callout-content support

* Use BlockContent | FootnoteContent for callout body

* Update quartz/plugins/transformers/ofm.ts

Co-authored-by: Jacky Zhao <j.zhao2k19@gmail.com>

* Refactor

* Combine child selectors

* Fix multiple callout members

* Empty check

* Replace splice

---------

Co-authored-by: Jacky Zhao <j.zhao2k19@gmail.com>

quartz/plugins/transformers/ofm.ts

@@ -414,8 +414,8 @@ export const ObsidianFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options>
                 return
               }
 
-              // find first line
-              const firstChild = node.children[0]
+              // find first line and callout content
+              const [firstChild, ...calloutContent] = node.children
               if (firstChild.type !== "paragraph" || firstChild.children[0]?.type !== "text") {
                 return
               }
@@ -492,6 +492,21 @@ export const ObsidianFlavoredMarkdown: QuartzTransformerPlugin<Partial<Options>
                     "data-callout-metadata": calloutMetaData,
                   },
                 }
+
+                // Add callout-content class to callout body if it has one.
+                if (calloutContent.length > 0) {
+                  const contentData: BlockContent | DefinitionContent = {
+                    data: {
+                      hProperties: {
+                        className: "callout-content",
+                      },
+                      hName: "div",
+                    },
+                    type: "blockquote",
+                    children: [...calloutContent],
+                  }
+                  node.children = [node.children[0], contentData]
+                }
               }
             })
           }

quartz/styles/callouts.scss

@@ -10,7 +10,7 @@
   transition: max-height 0.3s ease;
   box-sizing: border-box;
 
-  & > *:nth-child(2) {
+  & > .callout-content > :first-child {
     margin-top: 0;
   }