fix(docz-core): create plugin to fix paragraph parse on mdx

examples/basic/src/components/Alert.mdx

@@ -9,7 +9,7 @@ export const meta = doc('Alert')
 ## Basic usage
 
 <Playground>
-  <Alert>Other message</Alert>
+  <Alert>Some message</Alert>
 </Playground>
 
 ## Using different kinds
@@ -20,3 +20,15 @@ export const meta = doc('Alert')
   <Alert kind="negative">Some message</Alert>
   <Alert kind="warning">Some message</Alert>
 </Playground>
+
+## Use with children as a function
+
+<Playground>
+  {() => {
+    const message = 'Hello world'
+
+    return (
+      <Alert>{message}</Alert>
+    )
+  }}
+</Playground>

packages/docz-core/src/utils/plugin-mdast.ts

@@ -0,0 +1,61 @@
+import visit from 'unist-util-visit'
+import remove from 'unist-util-remove'
+
+const componentName = (value: string) => {
+  const match = value.match(/^\<\\?(\w+)/)
+  return match && match[1]
+}
+
+const valuesFromTreeNodes = (tree: any) => (first: number, last: number) => {
+  const values: string[] = []
+
+  if (first !== last) {
+    for (let i = last; i >= first; i--) {
+      const found = tree.children[i]
+
+      if (found.children && found.children.length > 0) {
+        values.push(...found.children.map((child: any) => child.value))
+      }
+
+      if (found.value && found.value.length > 0) {
+        values.push(found.value)
+      }
+
+      if (i !== first) remove(tree, found)
+    }
+  }
+
+  return values
+}
+
+export const plugin = () => (tree: any, file: any) => {
+  visit(tree, 'html', visitor)
+
+  function visitor(node: any, idx: any, parent: any): void {
+    try {
+      if (!node.value || typeof node.value !== 'string') return
+
+      const component = componentName(node.value)
+      const tagOpen = new RegExp(`^\\<${component}`)
+      const tagClose = new RegExp(`\\<\\/${component}\\>$`)
+
+      const hasOpenTag = (value: string) => tagOpen.test(value)
+      const hasCloseTag = (value: string) => tagClose.test(value)
+
+      if (!component || (hasOpenTag(node.value) && hasCloseTag(node.value)))
+        return
+
+      const tagCloseIdx = tree.children.findIndex(
+        ({ value }: any) => value && !hasOpenTag(value) && hasCloseTag(value)
+      )
+
+      const mergeUntilCloseTag = valuesFromTreeNodes(tree)
+      const values = mergeUntilCloseTag(idx, tagCloseIdx)
+
+      node.value = values.reverse().join('\n')
+    } catch (err) {
+      console.log(err)
+      return
+    }
+  }
+}