Adds git diff --shortstat support

src/git/git.ts

@@ -259,6 +259,14 @@ export class Git {
         return gitCommand({ cwd: repoPath }, ...params);
     }
 
+    static diff_shortstat(repoPath: string, sha?: string) {
+        const params = [`diff`, `--shortstat`, `--no-ext-diff`];
+        if (sha) {
+            params.push(sha);
+        }
+        return gitCommand({ cwd: repoPath }, ...params);
+    }
+
     static difftool_dirDiff(repoPath: string, sha1: string, sha2?: string) {
         const params = [`difftool`, `--dir-diff`, sha1];
         if (sha2) {

src/git/models/diff.ts

@@ -33,4 +33,10 @@ export interface GitDiff {
     chunks: GitDiffChunk[];
 
     diff?: string;
+}
+
+export interface GitDiffShortStat {
+    files: number;
+    insertions: number;
+    deletions: number;
 }

src/git/parsers/diffParser.ts

@@ -1,8 +1,9 @@
 'use strict';
 import { Iterables, Strings } from '../../system';
-import { GitDiff, GitDiffChunk, GitDiffChunkLine, GitDiffLine } from './../git';
+import { GitDiff, GitDiffChunk, GitDiffChunkLine, GitDiffLine, GitDiffShortStat } from './../git';
 
 const unifiedDiffRegex = /^@@ -([\d]+),([\d]+) [+]([\d]+),([\d]+) @@([\s\S]*?)(?=^@@)/gm;
+const shortStatDiffRegex = /^\s*(\d+)\sfiles? changed(?:,\s+(\d+)\s+insertions?\(\+\))?(?:,\s+(\d+)\s+deletions?\(-\))?/;
 
 export class GitDiffParser {
 
@@ -116,4 +117,20 @@ export class GitDiffParser {
 
         return chunkLines;
     }
+
+    static parseShortStat(data: string): GitDiffShortStat | undefined {
+        if (!data) return undefined;
+
+        const match = shortStatDiffRegex.exec(data);
+        if (match == null) return undefined;
+
+        const files = match[1];
+        const insertions = match[2];
+        const deletions = match[3];
+        return {
+            files: files == null ? 0 : parseInt(files, 10),
+            insertions: insertions == null ? 0 : parseInt(insertions, 10),
+            deletions: deletions == null ? 0 : parseInt(deletions, 10)
+        } as GitDiffShortStat;
+    }
 }

src/gitService.ts

@@ -4,7 +4,7 @@ import { Disposable, Event, EventEmitter, FileSystemWatcher, Location, Position,
 import { IConfig } from './configuration';
 import { DocumentSchemes, ExtensionKey, GlyphChars } from './constants';
 import { RemoteProviderFactory } from './git/remotes/factory';
-import { Git, GitAuthor, GitBlame, GitBlameCommit, GitBlameLine, GitBlameLines, GitBlameParser, GitBranch, GitBranchParser, GitCommit, GitDiff, GitDiffChunkLine, GitDiffParser, GitLog, GitLogCommit, GitLogParser, GitRemote, GitRemoteParser, GitStash, GitStashParser, GitStatus, GitStatusFile, GitStatusParser, IGit, setDefaultEncoding } from './git/git';
+import { Git, GitAuthor, GitBlame, GitBlameCommit, GitBlameLine, GitBlameLines, GitBlameParser, GitBranch, GitBranchParser, GitCommit, GitDiff, GitDiffChunkLine, GitDiffParser, GitDiffShortStat, GitLog, GitLogCommit, GitLogParser, GitRemote, GitRemoteParser, GitStash, GitStashParser, GitStatus, GitStatusFile, GitStatusParser, IGit, setDefaultEncoding } from './git/git';
 import { GitUri, IGitCommitInfo, IGitUriData } from './git/gitUri';
 import { Logger } from './logger';
 import * as fs from 'fs';
@@ -599,6 +599,10 @@ export class GitService extends Disposable {
         return Git.normalizePath(typeof fileNameOrUri === 'string' ? fileNameOrUri : fileNameOrUri.fsPath).toLowerCase();
     }
 
+    async getChangedFilesCount(repoPath: string, sha?: string): Promise<GitDiffShortStat | undefined> {
+        return GitDiffParser.parseShortStat(await Git.diff_shortstat(repoPath, sha));
+    }
+
     async getConfig(key: string, repoPath?: string): Promise<string> {
         Logger.log(`getConfig('${key}', '${repoPath}')`);