Replace web editor link behavior (#1319)

* Replace web editor link behavior (close #1293) (close #1292)

* Update link decorator to match rich text link detector

src/view/com/composer/text-input/web/LinkDecorator.ts

@@ -0,0 +1,106 @@
+/**
+ * TipTap is a stateful rich-text editor, which is extremely useful
+ * when you _want_ it to be stateful formatting such as bold and italics.
+ *
+ * However we also use "stateless" behaviors, specifically for URLs
+ * where the text itself drives the formatting.
+ *
+ * This plugin uses a regex to detect URIs and then applies
+ * link decorations (a <span> with the "autolink") class. That avoids
+ * adding any stateful formatting to TipTap's document model.
+ *
+ * We then run the URI detection again when constructing the
+ * RichText object from TipTap's output and merge their features into
+ * the facet-set.
+ */
+
+import {Mark} from '@tiptap/core'
+import {Plugin, PluginKey} from '@tiptap/pm/state'
+import {findChildren} from '@tiptap/core'
+import {Node as ProsemirrorNode} from '@tiptap/pm/model'
+import {Decoration, DecorationSet} from '@tiptap/pm/view'
+import {isValidDomain} from 'lib/strings/url-helpers'
+
+export const LinkDecorator = Mark.create({
+  name: 'link-decorator',
+  priority: 1000,
+  keepOnSplit: false,
+  inclusive() {
+    return true
+  },
+  addProseMirrorPlugins() {
+    return [linkDecorator()]
+  },
+})
+
+function getDecorations(doc: ProsemirrorNode) {
+  const decorations: Decoration[] = []
+
+  findChildren(doc, node => node.type.name === 'paragraph').forEach(
+    paragraphNode => {
+      const textContent = paragraphNode.node.textContent
+
+      // links
+      iterateUris(textContent, (from, to) => {
+        decorations.push(
+          Decoration.inline(paragraphNode.pos + from, paragraphNode.pos + to, {
+            class: 'autolink',
+          }),
+        )
+      })
+    },
+  )
+
+  return DecorationSet.create(doc, decorations)
+}
+
+function linkDecorator() {
+  const linkDecoratorPlugin: Plugin = new Plugin({
+    key: new PluginKey('link-decorator'),
+
+    state: {
+      init: (_, {doc}) => getDecorations(doc),
+      apply: (transaction, decorationSet) => {
+        if (transaction.docChanged) {
+          return getDecorations(transaction.doc)
+        }
+        return decorationSet.map(transaction.mapping, transaction.doc)
+      },
+    },
+
+    props: {
+      decorations(state) {
+        return linkDecoratorPlugin.getState(state)
+      },
+    },
+  })
+  return linkDecoratorPlugin
+}
+
+function iterateUris(str: string, cb: (from: number, to: number) => void) {
+  let match
+  const re =
+    /(^|\s|\()((https?:\/\/[\S]+)|((?<domain>[a-z][a-z0-9]*(\.[a-z0-9]+)+)[\S]*))/gim
+  while ((match = re.exec(str))) {
+    let uri = match[2]
+    if (!uri.startsWith('http')) {
+      const domain = match.groups?.domain
+      if (!domain || !isValidDomain(domain)) {
+        continue
+      }
+      uri = `https://${uri}`
+    }
+    let from = str.indexOf(match[2], match.index)
+    let to = from + match[2].length + 1
+    // strip ending puncuation
+    if (/[.,;!?]$/.test(uri)) {
+      uri = uri.slice(0, -1)
+      to--
+    }
+    if (/[)]$/.test(uri) && !uri.includes('(')) {
+      uri = uri.slice(0, -1)
+      to--
+    }
+    cb(from, to)
+  }
+}