extensions/git/src/repository.ts/Repository/headLabel
class Repository:	get headLabel(): string {
		const HEAD = this.HEAD;

		if (!HEAD) {
			return '';
		}

		const tag = this.refs.filter(iref => iref.type === RefType.Tag && iref.commit === HEAD.commit)[0];
		const tagName = tag && tag.name;
		const head = HEAD.name || tagName || (HEAD.commit || '').substr(0, 8);

		return head
			+ (this.workingTreeGroup.resourceStates.length + this.untrackedGroup.resourceStates.length > 0 ? '*' : '')
			+ (this.indexGroup.resourceStates.length > 0 ? '+' : '')
			+ (this.mergeGroup.resourceStates.length > 0 ? '!' : '');
	}