feat: Use is-terminal crate to mimic exact ls output even with flags when being piped.

[Oglo12]

There is a big problem! So, I use eza --icons as my ls alias, and often times I want to grep something from ls, or pipe the ls output into something like fzf, the problem is that the icons and colors are included. I have found a way to solve this though:

https://crates.io/crates/is-terminal

This crate allows you to tell various things, such as, is the output of the command being piped into another program?
Bat (a cat replacement), does this. It has fancy output when just being used as is, but when you pipe bat into grep for example, it produces the same exact output as cat.

[PThorpe92]

There is actually a very old but open PR that fixes this. Needed a reminder to look into it again 👍

[cafkafk]

#438 might also be used as inspiration for a solution

[cafkafk]

Actually, what version of eza are you on?

[Delapouite]

Also, as noted on the readme of the crate, this is not a builtin trait of the Rust std lib : https://doc.rust-lang.org/stable/std/io/trait.IsTerminal.html