refactor: give plugins their own files

Author: LadyBluenotes

src/utils/markdown/index.ts

@@ -1,2 +1 @@
 export { renderMarkdown } from './processor'
-export { rehypeParseCommentComponents } from './plugins'

src/utils/markdown/plugins.ts

@@ -0,0 +1,42 @@
+import { visit } from 'unist-util-visit'
+import { toString } from 'hast-util-to-string'
+
+import { isHeading } from './helpers'
+
+export type MarkdownHeading = {
+  id: string
+  text: string
+  level: number
+}
+
+export function rehypeCollectHeadings(
+  tree,
+  file,
+  initialHeadings?: MarkdownHeading[],
+) {
+  const headings = initialHeadings ?? []
+
+  return function collectHeadings(tree, file: any) {
+    visit(tree, 'element', (node) => {
+      if (!isHeading(node)) {
+        return
+      }
+
+      const id =
+        typeof node.properties?.id === 'string' ? node.properties.id : ''
+      if (!id) {
+        return
+      }
+
+      headings.push({
+        id,
+        level: Number(node.tagName.substring(1)),
+        text: toString(node).trim(),
+      })
+    })
+
+    if (file) {
+      file.data.headings = headings
+    }
+  }
+}

src/utils/markdown/plugins/collectHeadings.ts

@@ -0,0 +1,26 @@
+import { isElement } from 'hast-util-is-element'
+import type { Element } from 'hast-util-is-element/lib'
+
+export const normalizeComponentName = (name: string) => name.toLowerCase()
+
+export const slugify = (value: string, fallback: string) => {
+  if (!value) {
+    return fallback
+  }
+
+  return (
+    value
+      .trim()
+      .toLowerCase()
+      .replace(/[^a-z0-9\s-]/g, '')
+      .replace(/\s+/g, '-')
+      .replace(/-+/g, '-')
+      .replace(/^-|-$/g, '')
+      .slice(0, 64) || fallback
+  )
+}
+
+export const isHeading = (node: unknown): node is Element =>
+  isElement(node) && /^h[1-6]$/.test(node.tagName)
+
+export const headingLevel = (node: Element) => Number(node.tagName.substring(1))

src/utils/markdown/plugins/helpers.ts

@@ -0,0 +1,4 @@
+export { rehypeParseCommentComponents } from './parseCommentComponents'
+export { rehypeTransformCommentComponents } from './transformCommentComponents'
+export { transformTabsComponent } from './transformTabsComponent'
+export { type MarkdownHeading, rehypeCollectHeadings } from './collectHeadings'