Fixes issues with showing deleted file changes

Fixes issues with added files in diff title

src/commands/diffWith.ts

@@ -109,7 +109,18 @@ export class DiffWithCommand extends ActiveEditorCommand {
                 lhsSha = args.lhs.sha;
             }
             if (args.rhs.sha !== GitService.deletedOrMissingSha) {
-                rhsSha = args.rhs.sha;
+                // Ensure that the file still exists in this commit
+                const status = await Container.git.getFileStatusForCommit(
+                    args.repoPath,
+                    args.rhs.uri.fsPath,
+                    args.rhs.sha
+                );
+                if (status !== undefined && status.status === 'D') {
+                    args.rhs.sha = GitService.deletedOrMissingSha;
+                }
+                else {
+                    rhsSha = args.rhs.sha;
+                }
             }
 
             const [lhs, rhs] = await Promise.all([
@@ -133,7 +144,7 @@ export class DiffWithCommand extends ActiveEditorCommand {
                 rhsSuffix = `added in ${rhsSuffix}`;
             }
 
-            let lhsSuffix = GitService.shortenSha(lhsSha) || '';
+            let lhsSuffix = args.lhs.sha !== GitService.deletedOrMissingSha ? GitService.shortenSha(lhsSha) || '' : '';
             if (lhs === undefined && args.rhs.sha === '') {
                 if (rhs !== undefined) {
                     lhsSuffix = `not in ${lhsSuffix}`;

src/git/git.ts

@@ -712,6 +712,10 @@ export class Git {
         }
     }
 
+    static show_status(repoPath: string, fileName: string, ref: string) {
+        return git<string>({ cwd: repoPath }, 'show', '--name-status', '--format=', ref, '--', fileName);
+    }
+
     static stash_apply(repoPath: string, stashName: string, deleteAfter: boolean) {
         if (!stashName) return undefined;
         return git<string>({ cwd: repoPath }, 'stash', deleteAfter ? 'pop' : 'apply', stashName);

src/git/gitService.ts

@@ -1102,6 +1102,20 @@ export class GitService implements Disposable {
         }
     }
 
+    async getFileStatusForCommit(repoPath: string, fileName: string, ref: string): Promise<GitFile | undefined> {
+        if (ref === GitService.deletedOrMissingSha || GitService.isUncommitted(ref)) return undefined;
+
+        Logger.log(`getFileStatusForCommit('${repoPath}', '${fileName}', '${ref}')`);
+
+        const data = await Git.show_status(repoPath, fileName, ref);
+        if (!data) return undefined;
+
+        const files = GitDiffParser.parseNameStatus(data, repoPath);
+        if (files === undefined || files.length === 0) return undefined;
+
+        return files[0];
+    }
+
     async getRecentLogCommitForFile(repoPath: string | undefined, fileName: string): Promise<GitLogCommit | undefined> {
         return this.getLogCommitForFile(repoPath, fileName, undefined);
     }
@@ -1125,7 +1139,7 @@ export class GitService implements Disposable {
         options: { ref?: string; firstIfNotFound?: boolean; reverse?: boolean } = {}
     ): Promise<GitLogCommit | undefined> {
         Logger.log(
-            `getFileLogCommit('${repoPath}', '${fileName}', '${options.ref}', ${options.firstIfNotFound}, ${
+            `getLogCommitForFile('${repoPath}', '${fileName}', '${options.ref}', ${options.firstIfNotFound}, ${
                 options.reverse
             })`
         );