Reworks branch parsing to include tracking info

Reworks current branch retrieval for better performance

src/git/parsers/branchParser.ts

@@ -0,0 +1,24 @@
+'use strict';
+import { GitBranch } from './../git';
+const branchWithTrackingRegex = /^(\*?)\s+(.+?)\s+([0-9,a-f]+)\s+(?:\[(.*?\/.*?)(?:\:|\]))?/gm;
+
+export class GitBranchParser {
+
+    static parse(data: string, repoPath: string): GitBranch[] | undefined {
+        if (!data) return undefined;
+
+        const branches: GitBranch[] = [];
+
+        let match: RegExpExecArray | null = null;
+        do {
+            match = branchWithTrackingRegex.exec(data);
+            if (match == null) break;
+
+            branches.push(new GitBranch(repoPath, match[2], match[1] === '*', match[4]));
+        } while (match != null);
+
+        if (!branches.length) return undefined;
+
+        return branches;
+    }
+}