From 85b02bf020d7d78be206fde17408d024cc0b0c52 Mon Sep 17 00:00:00 2001
From: Kohei Watanabe <kou029w@gmail.com>
Date: Sat, 17 Sep 2022 21:42:09 +0900
Subject: [PATCH] auto indent

---
 app/views/components/editor.tsx | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/app/views/components/editor.tsx b/app/views/components/editor.tsx
index ab333cf..4f082a8 100644
--- a/app/views/components/editor.tsx
+++ b/app/views/components/editor.tsx
@@ -1,7 +1,7 @@
 import { onCleanup, onMount } from "solid-js";
 import { minimalSetup } from "codemirror";
 import { emacsStyleKeymap, indentWithTab } from "@codemirror/commands";
-import { indentUnit } from "@codemirror/language";
+import { indentService, indentUnit } from "@codemirror/language";
 import { EditorView, keymap } from "@codemirror/view";
 import type Pages from "../../protocol/pages";
 import "./editor.css";
@@ -37,6 +37,11 @@ export default (props: {
         }),
         EditorView.lineWrapping,
         indentUnit.of(" "),
+        indentService.of((context, pos) => {
+          const previousLine = context.lineAt(pos, -1).text;
+          if (previousLine.trim() === "") return null;
+          return /^[ \t]*/.exec(previousLine)?.[0]?.length ?? null;
+        }),
         keymap.of([indentWithTab, ...emacsStyleKeymap]),
         minimalSetup,
         quotLanguage,