ergeat jbbae

package.json

@@ -100,8 +100,10 @@
     "@types/wicg-file-system-access": "^2020.9.1",
     "@webcomponents/webcomponentsjs": "^2.5.0",
     "clone-deep": "^4.0.1",
+    "electron-context-menu": "^2.4.0",
     "electron-squirrel-startup": "^1.0.0",
     "hast-util-to-html": "^7.1.2",
+    "immer": "^8.0.1",
     "lit-element": "^2.4.0",
     "lit-html": "^1.3.0",
     "mdast-util-compact": "^3.0.0",

src/ast/backspace-paragraph.ts

@@ -0,0 +1,36 @@
+import {visit, EXIT} from "unist-utils-core"
+import * as md from "mdast"
+import compact from "mdast-util-compact"
+
+export default function backspaceParagraph(
+	root: md.Parent,
+	target: md.Paragraph,
+	id?: string
+): void {
+	visit(root, target, (node, index, parents) => {
+		let parent = parents[parents.length - 1]
+
+		let previous = parent.children[index - 1]
+		if (!previous) {
+			throw new RangeError(
+				"can't merge backwards when there is nothing behind"
+			)
+		}
+
+		if (Array.isArray(previous.children)) {
+			let length = previous.children.length
+			previous.children.splice(length, 0, ...node.children)
+			parent.children[index - 1] = compact(previous)
+			// TODO come back and use merge
+			if (id) {
+				let child = previous.children[length - 1]
+				child.id = id
+			}
+		} else {
+			throw new TypeError("line before somehow has no children?")
+		}
+
+		parent.children.splice(index, 1)
+		return EXIT
+	})
+}