Check if the output is a tty

[yxnan]

Description

The color code should not be emitted if the stdout is not a typical terminal, we add the check so there is no need to explictly specify --stdout

Issues

p-e-w/shin#3 (comment)

[yxnan]

I think changing how the --stdout option works can have both feet on the ground. By having 3 possible values rather than a simple switch, we can choose to let the program decide itself or specify a value we want.

Despite having changed the default config, users who keep the older configs can still expect the program works exactly as before.

[hykilpikonna]

I think changing how the --stdout option works can have both feet on the ground. By having 3 possible values rather than a simple switch, we can choose to let the program decide itself or specify a value we want.

Despite having changed the default config, users who keep the older configs can still expect the program works exactly as before.

That's a nice solution, thank you so much!