Prompt colors shown as ANSI color code

[edouard-lopez]

related: timofurrer/colorful#26

---

When running in a docker I get ANSI colour code instead of the color should get thanks to colorful module.

❯ docker run \
     --name run-pure-on-elvish \
     --rm \
     --interactive \
     --tty \
     --volume=$PWD:/home/nemo/.pure/ \
     pure-on-elvish-latest
^[[38;2;173;216;230m/home/pure/.pure^[[39m^[[26m
^[[38;2;190;190;190mmaster^[[39m^[[26m^[[38;2;190;190;190m*^[[39m^[[26m
^[[38;2;205;0;0m❯^[[39m^[[26m

However if in said container I run a Python3 prompt, it works fine:

$ python3
Python 3.6.8 (default, Jan 24 2019, 16:36:30)
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import colorful
>>> print(colorful.red('red {0} red'.format(colorful.white('white'))))
red white red  <---------------- colored adequatly

I tried to force color in my container using -e TERM=xterm-256color without success.

[SolitudeSF]

okay, i kinda misled you, you actually need to pipe your prompt to terminal with
>/dev/tty. i just did edit:prompt = { python3 prompt.py >/dev/tty } and it now displays properly.

[edouard-lopez]

@SolitudeSF it solve the colors issue but I got an extra newline not present in other shells, see #805