Wrong colors inside tmux

[rpereira]

Hi @lifepillar,

The colors are rendered nicely outside tmux, but here's how it looks inside tmux:

Running on a 24-bit capable terminal emulator; latest version of tmux, with the following settings:

set -g default-terminal "xterm-256color"
set -ga terminal-overrides ",xterm-256color:Tc"

Any idea what the problem might be? Thanks.

[lifepillar]

Maybe related to vim/vim#804?

[nelsyeung]

Is this related to this? http://superuser.com/questions/399296/256-color-support-for-vim-background-in-tmux

[rpereira]

@lifepillar It might be...

@nelsyeung I don't think so. If if set screen-256 instead of xterm, things become even crazier. :)

[nelsyeung]

@ruiafonsopereira Are you sure your TERM variable is actually screen-256color, thought? I mean a lot of people set tmux default terminal to be screen-256color then have export TERM=xterm-256color, which is wrong.

If you do echo $TERM inside tmux with set -g default-terminal "screen-256color", it should be screen-256color. If not, then you must have a .bashrc or some other start up script with the export TERM variable set there, or it can be in your terminal app settings as well.

I find that a lot of colour problems with tmux is to do with inconsistency between tmux TERM var and the actual TERM var. So it's worth a shot.

I don't actually have this problem with my tmux on Terminal.app and on SUSE enterprise Konsole.

[rpereira]

Hi @nelsyeung

Thanks for pointing that out, but I actually have set the right TERM variable. However, my terminal app (iTerm2) reports xterm-256 color and I can't change that to screen. This was never a problem until I've tried Vim and tmux with true color.

[lifepillar]

Can anyone check NeoVim with true color support enabled? Colors are ok outside tmux, but they are off inside tmux. With tmux configured as follows NeoVim displays colors just fine in iTerm2:

set -g default-terminal    "screen-256color"
set -ga terminal-overrides ",xterm-256color:Tc"

I suggest that we wait for vim/vim#804 to be closed, to see whether that fixes this issue as well.

[rpereira]

Unfortunately, the issue on the vim repository doesn't seem to get a lot of attention.

Perhaps we should wait, @lifepillar

[lifepillar]

@ruiafonsopereira The only workaround I can think of is to set your 16 terminal colors to the Solarized palette and set notermguicolors in vimrc when you are inside tmux:

  if has('termguicolors') && $TERM_PROGRAM ==# 'iTerm.app' && $TERM !~# '^\%(screen\|tmux\)'
    set termguicolors
  else
    set notermguicolors
  endif

Or use NeoVim…

[lifepillar]

It seems that Vim p1942 fixes this problem. @ruiafonsopereira Could you please confirm that?

[rpereira]

@lifepillar
I've seen the patch, but without changing configuration, now Vim renders everything in grey when inside Tmux if termguicolors is set. I'd have try and address that issue first.

[rpereira]

@lifepillar and @nelsyeung Any idea what might be or what am I missing?

My configurations are the same specified on #1 (comment)

Inside tmux:

➔ echo $TERM
screen-256color

➔ tmux info | grep Tc
197: Tc: (flag) true

Thanks.

[lifepillar]

@ruiafonsopereira Yes, I had the same problem. You need to add this to your vimrc:

set t_8f=^[[38;2;%lu;%lu;%lum  " Needed in tmux
set t_8b=^[[48;2;%lu;%lu;%lum  " Ditto

(where ^[ is literal Esc, that you get by typing <C-V><C-[>). See :h xterm-true-color for the details.

[rpereira]

My bad. I was experimenting and changed “;” to “:” and forgot to revert. Problem solved. Thanks @lifepillar
.

On 18 Jun 2016, at 19:59, Lifepillar notifications@github.com wrote:

@ruiafonsopereira https://github.com/ruiafonsopereira Yes, I had the same problem. You need to add this to your vimrc:

set t_8f=^[[38;2;%lu;%lu;%lum " Needed in tmux
set t_8b=^[[48;2;%lu;%lu;%lum " Ditto
(where ^[ is literal Esc, that you get by typing <C-[>). See :h xterm-true-colors for the details.

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[vprasanth]

tmux/tmux#696

The comment regarding properly overriding was my problem. Maybe that will help anyone who still is having the colours look funky within tmux.