Add basic multi-view support

src/app/editor.ts

@@ -1,7 +1,10 @@
-import { basicSetup } from "codemirror";
-import { EditorView } from "@codemirror/view";
+import { Transaction } from "@codemirror/state";
+import { EditorView, keymap } from "@codemirror/view";
+import { defaultKeymap, undo, redo } from "@codemirror/commands";
 import { oneDark } from "@codemirror/theme-one-dark";
 
+import { OpenFile } from "./filestate";
+
 const fixedHeightEditor = EditorView.theme({
     "&": {
         height: "100%",
@@ -11,17 +14,33 @@ const fixedHeightEditor = EditorView.theme({
         width: "600px",
         minWidth: "8em",
         flex: "none",
+        fontSize: "16px",
     },
     ".cm-scroller": { overflow: "auto scroll" },
 });
 
 export class Editor {
     view: EditorView;
+    file: OpenFile;
 
-    constructor() {
+    dispatch(tr: Transaction, inhibitSync = false) {
+        this.view.update([tr]);
+        if (!inhibitSync) {
+            this.file.dispatch({ changes: tr.changes }, this);
+        }
+    }
+
+    constructor(file: OpenFile) {
+        this.file = file;
+        const kmap = keymap.of([
+            ...defaultKeymap,
+            { key: "Mod-z", run: () => undo(file.target) },
+            { key: "Mod-shift-z", run: () => redo(file.target) },
+        ]);
         this.view = new EditorView({
-            doc: "Start document",
-            extensions: [basicSetup, oneDark, fixedHeightEditor],
+            doc: file.rootState.doc,
+            dispatch: (trs) => this.dispatch(trs),
+            extensions: [oneDark, fixedHeightEditor, kmap],
         });
     }
 

src/app/editorgrid.ts

@@ -2,7 +2,7 @@ import van from "vanjs-core";
 import * as vanX from "vanjs-ext";
 const v = van.tags;
 
-import { Editor } from "./editor";
+import { OpenFile } from "./filestate";
 import * as u from "./utils";
 
 const EditorWrapper = (editor: any, del: any, k: any) =>
@@ -20,9 +20,10 @@ const editors = vanX.reactive([[]]);
 const currentTab = van.state(0);
 van.derive(() => console.log("Setting tab to", currentTab.val));
 
-export function addEditor() {
+export function addEditor(file: OpenFile) {
     console.log("Adding editor to tab ", currentTab.val, editors);
-    editors[currentTab.val].push(vanX.noreactive(new Editor()));
+    const editor = file.createEditor();
+    editors[currentTab.val].push(vanX.noreactive(editor));
 }
 export function addTab() {
     editors.push([]);

src/app/filestate.ts

@@ -0,0 +1,85 @@
+import {
+    EditorState,
+    EditorStateConfig,
+    TransactionSpec,
+    StateEffect,
+} from "@codemirror/state";
+import { history } from "@codemirror/commands";
+import { Editor } from "./editor";
+
+const openFiles: { [path: string]: OpenFile } = {};
+
+export class OpenFile {
+    filePath: string;
+    editors: Editor[];
+    rootState: EditorState;
+
+    constructor(cfg: EditorStateConfig) {
+        this.filePath = null;
+        this.editors = [];
+        this.rootState = EditorState.create(cfg).update({
+            effects: [StateEffect.appendConfig.of([history()])],
+        }).state;
+    }
+
+    static async openFile(filePath?: string) {
+        const { content, path } = await window.electronAPI.readFile(filePath);
+        const file = new OpenFile({ doc: content });
+        file.setPath(path);
+        return file;
+    }
+
+    private setPath(path: string) {
+        delete openFiles[this.filePath];
+        this.filePath = path;
+        openFiles[path] = this;
+    }
+
+    async saveFile() {
+        if (this.filePath) {
+            await window.electronAPI.saveFile(
+                this.rootState.doc.toString(),
+                this.filePath,
+            );
+        } else {
+            await this.saveAs();
+        }
+    }
+
+    async saveAs(filePath?: string) {
+        const { path } = await window.electronAPI.saveFile(
+            this.rootState.doc.toString(),
+            filePath,
+        );
+        this.setPath(path);
+    }
+
+    // Function to create and return a new EditorView for this file
+    createEditor(): Editor {
+        const editor = new Editor(this);
+        this.editors.push(editor);
+        return editor;
+    }
+
+    dispatch(trs: TransactionSpec, origin?: Editor) {
+        console.log("Dispatching trs", trs, "to", this.editors, "from", origin);
+        console.log(this.rootState);
+        this.rootState = this.rootState.update(trs).state;
+        if (origin) {
+            const es = this.editors.filter((e) => e !== origin);
+            es.forEach((e) => e.dispatch(e.view.state.update(trs), true));
+        } else {
+            this.editors.forEach((e) =>
+                e.dispatch(e.view.state.update(trs), true),
+            );
+        }
+    }
+
+    get target() {
+        console.log("Getting target");
+        return {
+            state: this.rootState,
+            dispatch: (tr: TransactionSpec) => this.dispatch(tr),
+        };
+    }
+}

src/app/renderer.ts

@@ -2,13 +2,17 @@
 import "./index.css";
 
 import van from "vanjs-core";
-import * as vanX from "vanjs-ext";
 const v = van.tags;
 
-import { Editor } from "./editor";
 import { FolderTreeView } from "./foldernav";
 import { EditorTabs, addTab, addEditor } from "./editorgrid";
 import * as u from "./utils";
+import { OpenFile } from "./filestate";
+
+function newFile() {
+    const file = new OpenFile({});
+    addEditor(file);
+}
 
 const app = v.div(
     { class: "h-screen max-h-screen w-screen max-w-screen flex" },
@@ -17,7 +21,7 @@ const app = v.div(
             class: "flex-none resize-x overflow-x-hidden overflow-y-scroll w-3xs min-w-32",
         },
         u.InlineButton(addTab, "Add Tab", "+Tab"),
-        u.InlineButton(addEditor, "Add Editor", "+File"),
+        u.InlineButton(newFile, "Add Editor", "+File"),
         FolderTreeView,
     ),
     EditorTabs,
@@ -25,4 +29,6 @@ const app = v.div(
 
 van.add(document.body, app);
 
-addEditor();
+const file = new OpenFile({});
+addEditor(file);
+addEditor(file);