Implements #51: Folding commands

web/editor.tsx

@@ -84,6 +84,7 @@ import { Panel } from "./components/panel.tsx";
 import { TopBar } from "./components/top_bar.tsx";
 import {
   BookIcon,
+  codeFolding,
   HomeIcon,
   preactRender,
   TerminalIcon,
@@ -879,6 +880,9 @@ export class Editor {
         history(),
         drawSelection(),
         dropCursor(),
+        codeFolding({
+          placeholderText: "…",
+        }),
         indentOnInput(),
         ...cleanModePlugins(this),
         EditorView.lineWrapping,
@@ -914,6 +918,7 @@ export class Editor {
             run: (): boolean => {
               this.viewDispatch({ type: "start-navigate" });
               this.space.updatePageList();
+
               return true;
             },
           },

web/styles/editor.scss

@@ -21,6 +21,18 @@
     max-width: 100%;
   }
 
+  // Gutter styling
+  .cm-gutters {
+    background-color: transparent;
+    border-right: none;
+
+  }
+
+  .cm-foldPlaceholder {
+    background-color: transparent;
+    border: 0;
+  }
+
 
   // Indentation of follow-up lines
   @mixin lineOverflow($baseIndent, $bulletIndent: 0) {

web/syscalls/editor.ts

@@ -1,5 +1,14 @@
 import { Editor } from "../editor.tsx";
-import { EditorView, Transaction, Vim, vimGetCm } from "../deps.ts";
+import {
+  EditorView,
+  foldAll,
+  foldCode,
+  Transaction,
+  unfoldAll,
+  unfoldCode,
+  Vim,
+  vimGetCm,
+} from "../deps.ts";
 import { SysCallMapping } from "../../plugos/system.ts";
 import type { FilterOption } from "../types.ts";
 
@@ -172,6 +181,19 @@ export function editorSyscalls(editor: Editor): SysCallMapping {
       const cm = vimGetCm(editor.editorView!)!;
       return Vim.handleEx(cm, exCommand);
     },
+    // Folding
+    "editor.fold": () => {
+      foldCode(editor.editorView!);
+    },
+    "editor.unfold": () => {
+      unfoldCode(editor.editorView!);
+    },
+    "editor.foldAll": () => {
+      foldAll(editor.editorView!);
+    },
+    "editor.unfoldAll": () => {
+      unfoldAll(editor.editorView!);
+    },
   };
 
   return syscalls;