add option to disable color escapes on stdout

[nerdralph]

Bug Report

Current behavior

arduino-cli board details

color escape characters show up on stdout:
Option: MCU mcu
←[32mATtiny13←[0m ←[32m?←[0m ←[32mmcu=t13←[0m

Expected behavior

no escape codes

Environment

• CLI version (output of arduino-cli version): 0.9.0 Commit: e4d02b4
• OS and platform: Win7E/mingw32

Additional context

colored output on stdout appears to be hard-coded.

arduino-cli/cli/cli.go

Line 180 in 2791756

// if we print on stdout, do it in full colors

[howjmay]

Is there a way to reproduce the colored message without Arduino board?

[per1234]

@howjmay this should do it (the last command produces the color escape output, the first two are just needed to install the arduino:avr platform so that the last command will work):

arduino-cli core update-index
arduino-cli core install arduino:avr
arduino-cli board details arduino:avr:nano

[howjmay]

May I try to take this issue. I guess I find the solution for this issue (at least the command listed above). What is the command that can toggle the color?

[howjmay]

@per1234 @rsora I will add flag --plain in cli/board/details.go and cli/lib/check_deps.go to print plain text instead of color text. What do you guys think?

[matthijskooijman]

Maybe using --color=[auto|always|never], like many GNU tools support, could be nice for consistency?

E.g. man ls has:

   --color[=WHEN]
         colorize the output; WHEN can be 'always' (default if
         omitted), 'auto', or 'never'; more info below

...

   Using color to distinguish file types is disabled both by default and
   with --color=never.  With --color=auto, ls emits color codes only
   when standard output is connected to a terminal. 

[ubidefeo]

I'm with @matthijskooijman on this

if we support colour format we should use more legacy-like methods

[umbynos]

I think we can close this one since we added the flag --no-color in #1418