Large file optimization for updating outline

lib/main/atom/utils/atom.ts

@@ -97,3 +97,32 @@ async function editorTokenized(editor: Atom.TextEditor) {
     }
   })
 }
+
+// From https://github.com/atom-community/atom-ide-outline/blob/ec1a7197d63055de910562da3cc2b95fd939afc4/src/main.ts#L53
+// minimum number of line length to trigger large file optimizations
+const longLineLength =
+  (atom.config.get("linter-ui-default.longLineLength") as number | null) ?? 4000
+// minimum number of lines to trigger large file optimizations
+const largeFileLineCount =
+  ((atom.config.get("linter-ui-default.largeFileLineCount") as number | null) ?? 3000) / 6
+
+export function lineCountIfLarge(editor: Atom.TextEditor) {
+  // @ts-ignore
+  if (editor.largeFileMode) {
+    return 20000
+  }
+  const lineCount = editor.getLineCount()
+  if (lineCount >= largeFileLineCount) {
+    // large file detection
+    return lineCount
+  } else {
+    // long line detection
+    const buffer = editor.getBuffer()
+    for (let i = 0, len = lineCount; i < len; i++) {
+      if (buffer.lineLengthForRow(i) > longLineLength) {
+        return longLineLength
+      }
+    }
+    return 0 // small file
+  }
+}

lib/main/atom/views/outline/navigationTreeComponent.tsx

@@ -1,6 +1,7 @@
 import {CompositeDisposable, Disposable, TextEditor} from "atom"
 import * as etch from "etch"
 import {isEqual} from "lodash"
+import debounce from "lodash/debounce"
 import {NavigationTree} from "typescript/lib/protocol"
 import {GetClientFunction} from "../../../../client"
 import {handlePromise} from "../../../../utils"
@@ -185,6 +186,9 @@ export class NavigationTreeComponent
     // set navTree
     await this.loadNavTree()
 
-    this.editorChanging = editor.onDidStopChanging(this.loadNavTree)
+    const lineCount = atomUtils.lineCountIfLarge(editor)
+    this.editorChanging = editor.onDidStopChanging(
+      lineCount === 0 ? this.loadNavTree : debounce(this.loadNavTree, Math.max(lineCount / 5, 300)),
+    )
   }
 }