balooshow: Colorize only when attached to terminal
Test Plan:
$ balooshow otto.txt $ balooshow otto.txt | head -n 12
Reviewers: Baloo, bruns, FreeBSD, tcberner
Reviewed By: Baloo, bruns, FreeBSD, tcberner
Subscribers: tcberner, Frameworks
Tags: Frameworks, Baloo
Differential Revision: https://phabricator.kde.org/D12226