This is (part of) the build output of a Ruby project, where dependencies are installed with Bundler:
```
[33mDon't run Bundler as root. Bundler can ask for sudo if it is needed, and
installing your bundle as root will break this application for all non-root
users on this machine.[0m
```
Note the `[33m` and `[0m`; these are ANSI-style color markers that can be parsed so the output is rendered in the actual color in the build output panel. Is that something Harbormaster should do?