From 503d702f47338d876565c8bb42eb4bd493c04636 Mon Sep 17 00:00:00 2001
From: Bruno Windels <brunow@matrix.org>
Date: Fri, 21 Jun 2019 11:40:27 +0200
Subject: [PATCH] take list nesting into account for indenting

---
 src/editor/deserialize.js | 27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/src/editor/deserialize.js b/src/editor/deserialize.js
index 7e4e82affe..6507a8dc12 100644
--- a/src/editor/deserialize.js
+++ b/src/editor/deserialize.js
@@ -70,7 +70,7 @@ function parseCodeBlock(n, partCreator) {
     return parts;
 }
 
-function parseElement(n, partCreator) {
+function parseElement(n, partCreator, state) {
     switch (n.nodeName) {
         case "A":
             return parseLink(n, partCreator);
@@ -86,12 +86,18 @@ function parseElement(n, partCreator) {
             return partCreator.plain(`\`${n.textContent}\``);
         case "DEL":
             return partCreator.plain(`<del>${n.textContent}</del>`);
-        case "LI":
+        case "LI": {
+            const indent = "  ".repeat(state.listDepth - 1);
             if (n.parentElement.nodeName === "OL") {
-                return partCreator.plain(` 1. `);
+                return partCreator.plain(`${indent}1. `);
             } else {
-                return partCreator.plain(` - `);
+                return partCreator.plain(`${indent}- `);
             }
+        }
+        case "OL":
+        case "UL":
+            state.listDepth = (state.listDepth || 0) + 1;
+        // es-lint-disable-next-line no-fallthrough
         default:
             // don't textify block nodes we'll decend into
             if (!checkDecendInto(n)) {
@@ -161,6 +167,7 @@ function parseHtmlMessage(html, partCreator) {
     const parts = [];
     let lastNode;
     let inQuote = false;
+    const state = {};
 
     function onNodeEnter(n) {
         if (checkIgnored(n)) {
@@ -178,7 +185,7 @@ function parseHtmlMessage(html, partCreator) {
         if (n.nodeType === Node.TEXT_NODE) {
             newParts.push(...parseAtRoomMentions(n.nodeValue, partCreator));
         } else if (n.nodeType === Node.ELEMENT_NODE) {
-            const parseResult = parseElement(n, partCreator);
+            const parseResult = parseElement(n, partCreator, state);
             if (parseResult) {
                 if (Array.isArray(parseResult)) {
                     newParts.push(...parseResult);
@@ -207,8 +214,14 @@ function parseHtmlMessage(html, partCreator) {
         if (checkIgnored(n)) {
             return;
         }
-        if (n.nodeName === "BLOCKQUOTE") {
-            inQuote = false;
+        switch (n.nodeName) {
+            case "BLOCKQUOTE":
+                inQuote = false;
+                break;
+            case "OL":
+            case "UL":
+                state.listDepth -= 1;
+                break;
         }
         lastNode = n;
     }