implement microsoft/vscode#264100 (#7760)

Author: joshspicer

src/@types/vscode.proposed.chatParticipantAdditions.d.ts

@@ -125,6 +125,16 @@ declare module 'vscode' {
 		 * Optional URI to navigate to when clicking on the file.
 		 */
 		goToFileUri?: Uri;
+
+		/**
+		 * Added data (e.g. line numbers) to show in the UI
+		 */
+		added?: number;
+
+		/**
+		 * Removed data (e.g. line numbers) to show in the UI
+		 */
+		removed?: number;
 	}
 
 	/**

src/github/copilotRemoteAgent.ts

@@ -1327,10 +1327,13 @@ export class CopilotRemoteAgentManager extends Disposable {
 
 			const diffEntries: vscode.ChatResponseDiffEntry[] = [];
 			for (const changeModel of changeModels) {
+				const { added, removed } = await changeModel.calculateChangedLinesCount();
 				diffEntries.push({
 					originalUri: changeModel.parentFilePath,
 					modifiedUri: changeModel.filePath,
 					goToFileUri: changeModel.filePath,
+					added,
+					removed,
 				});
 			}
 

src/github/copilotRemoteAgent/chatSessionContentBuilder.ts

@@ -440,10 +440,13 @@ export class ChatSessionContentBuilder {
 
 			const diffEntries: vscode.ChatResponseDiffEntry[] = [];
 			for (const changeModel of changeModels) {
+				const { added, removed } = await changeModel.calculateChangedLinesCount();
 				diffEntries.push({
 					originalUri: changeModel.parentFilePath,
 					modifiedUri: changeModel.filePath,
-					goToFileUri: changeModel.filePath
+					goToFileUri: changeModel.filePath,
+					added,
+					removed,
 				});
 			}
 

src/view/fileChangeModel.ts

@@ -5,7 +5,7 @@
 
 import * as vscode from 'vscode';
 import { ViewedState } from '../common/comment';
-import { DiffHunk, parsePatch } from '../common/diffHunk';
+import { DiffChangeType, DiffHunk, parsePatch } from '../common/diffHunk';
 import { GitChangeType, InMemFileChange, SimpleFileChange, SlimFileChange } from '../common/file';
 import Logger from '../common/logger';
 import { resolvePath, toPRUri, toReviewUri } from '../common/uri';
@@ -66,6 +66,28 @@ export abstract class FileChangeModel {
 		return diffHunks;
 	}
 
+	public async calculateChangedLinesCount(): Promise<{ added: number; removed: number }> {
+		try {
+			const diffHunks = await this.diffHunks();
+			let added = 0;
+			let removed = 0;
+
+			for (const hunk of diffHunks) {
+				for (const line of hunk.diffLines) {
+					if (line.type === DiffChangeType.Add) {
+						++added;
+					} else if (line.type === DiffChangeType.Delete) {
+						++removed;
+					}
+				}
+			}
+			return { added, removed };
+		} catch (error) {
+			Logger.warn(`Failed to calculate added/removed lines for ${this.fileName}: ${error}`, FileChangeModel.ID);
+			return { added: 0, removed: 0 };
+		}
+	}
+
 	constructor(public readonly pullRequest: PullRequestModel,
 		protected readonly folderRepoManager: FolderRepositoryManager,
 		public readonly change: SimpleFileChange,