Add a command line flag to enable or disable color output

[Matt343]

Describe the feature

The use_colors config option enables or disables console escape codes in the DBT command output, but you cannot currently override the value from profiles.yml when running a command. Adding --use-colors and --no-use-colors (similar to how partial parsing is handled) would allow us to be explicit with what output format we need in each environment without needing completely separate profiles.yml files.

Describe alternatives you've considered

We handle other environment specific values in profiles.yml using env_var Jinja blocks, but the boolean options in the config section do not seem to support that mechanism.

Additional context

Who will this benefit?

DBT command line users who want to configure color output differently for different commands/contexts, or who want color output usually but occasionally pipe the output of DBT into other tools.

[drewbanin]

Thanks for the report @Matt343! I think we'll have a good answer on boolean env vars for 0.17.0, but I'm not opposed to --use-colors and --no-use-colors flags. Feel free to send through a PR for those flags if you're interested! :D

[invinceyble]

I'd be keen to work on this if @Matt343 isn't. I haven't looked too closely at everything, but I suspect it might look similar to this commit, is that right? c38c8d5

[drewbanin]

hey @invinceyble - I think c38c8d5 is a great source of inspiration for this flag :)

[rsenseman]

@invinceyble Are you working on this? If not, I can pick this up this week

[invinceyble]

@invinceyble Are you working on this? If not, I can pick this up this week

@rsenseman Totally slipped off my radar, all yours! :)