emulate-scroll-for-no-mouse-alternate-buffer not working?

[jocap]

Hi!

I installed this plugin today, but unfortunately, the option @emulate-scroll-for-no-mouse-alternate-buffer is not working properly for me. Here is my configuration:

run-shell ~/config/tmux/plugins/tmux-better-mouse-mode/scroll_copy_mode.tmux
set -g mouse on
set -g @emulate-scroll-for-no-mouse-alternate-buffer on

I'd like to be able to scroll in less using my mouse wheel, but it doesn't work.

Here's the output of tmux list-keys -T root:

bind-key -T root MouseDown1Pane   select-pane -t = ; send-keys -M
bind-key -T root MouseDown1Status select-window -t =
bind-key -T root MouseDown3Pane   if-shell -F -t = "#{mouse_any_flag}" "select-pane -t=; send-keys -M" "select-pane -mt="
bind-key -T root MouseDrag1Pane   if-shell -F -t = "#{mouse_any_flag}" "if -Ft= \"#{pane_in_mode}\" \"copy-mode -M\" \"send-keys -M\"" "copy-mode -M"
bind-key -T root MouseDrag1Border resize-pane -M
bind-key -T root WheelUpPane      if-shell -F -t = "#{mouse_any_flag}" "send-keys -M" "         if -Ft= ''           \"send-keys -t= up ; send-keys -t= up ; send-keys -t= up ; \"           \"             select-pane -t= ;             if -Ft= '#{pane_in_mode}'               'send-keys -M ; send-keys -M ; send-keys -M ; '               'copy-mode -e ; send-keys -M ; send-keys -M ; send-keys -M ; '           \"       "
bind-key -T root WheelUpStatus    previous-window
bind-key -T root WheelDownPane    if-shell -F -t = "#{mouse_any_flag}" "send-keys -M" "         if -Ft= \"\"           \"send-keys -t= down ; send-keys -t= down ; send-keys -t= down ; \"           \"select-pane -t= ; send-keys -M ; send-keys -M ; send-keys -M ; \"       "
bind-key -T root WheelDownStatus  next-window

Have I missed something? I'm running OpenBSD 6.3.

[NHDaly]

Hmm, let's start with some small questions: which version of tmux do you have?

[jocap]

Unfortunately, tmux on OpenBSD has no version, as it’s a part of the operating system itself :-) The version, I suppose, is tmux as of OpenBSD 6.3.

…

Nathan Daly wrote: Hmm, let's start with some small questions: which version of tmux do you have?

[gregflynn]

I have the same issue, here are all my deets:
Arch Linux (4.18.16.arch1-1)
tmux 2.8-1
terminal emulator: alacritty 0.2.1-1

relevant bits from ~/.tmux.conf

set -g @plugin 'tmux-plugins/tpm'
set -g mouse on
set -g @plugin 'nhdaly/tmux-better-mouse-mode'
set -g @scroll-without-changing-pane "on"
set -g @emulate-scroll-for-no-mouse-alternate-buffer "on"
set -g @scroll-speed-num-lines-per-scroll "3"

$ tmux list-keys -T root
bind-key -T root MouseDown1Pane   select-pane -t = ; send-keys -M
bind-key -T root MouseDown1Status select-window -t =
bind-key -T root MouseDown3Pane   if-shell -F -t = "#{mouse_any_flag}" "select-pane -t=; send-keys -M" "select-pane -mt="
bind-key -T root MouseDrag1Pane   if-shell -F -t = "#{mouse_any_flag}" "if -Ft= \"#{pane_in_mode}\" \"copy-mode -M\" \"send-keys -M\"" "copy-mode -M"
bind-key -T root MouseDrag1Border resize-pane -M
bind-key -T root WheelUpPane      if-shell -F -t = "#{mouse_any_flag}" "send-keys -M" "if -Ft= \"#{pane_in_mode}\" \"send-keys -M\" \"copy-mode -et=\""
bind-key -T root WheelUpStatus    previous-window
bind-key -T root WheelDownStatus  next-window
bind-key -T root M-Up             select-pane -U
bind-key -T root M-Down           select-pane -D
bind-key -T root M-Left           select-pane -L
bind-key -T root M-Right          select-pane -R

Hopefully I'm just doing something dumb

[pappasam]

Solution!

OS: Linux Mint 19.x
Tmux version: 2.9
Less version: 551

I found the solution (at least for myself on Linux Mint 19.x). I was using an older version of less and was using the following option in my LESS environment variable (set in zshrc):

 -X or --no-init
                Disables sending the termcap initialization  and  deinitializa‐
                tion  strings  to the terminal.  This is sometimes desirable if
                the deinitialization string does  something  unnecessary,  like
                clearing the screen.

I was doing this for a good reason (that I can't quite remember now), but it made it so less was not sent to an alternate buffer (alternate_on didn't register less as a valid alt process).

Luckily, the latest version of less has mouse support! You just need to do the following:

1. Install latest version of less from source (551 at this time): http://www.greenwoodsoftware.com/less/download.html
2. Update LESS config in zshrc to do what you want
3. Have the correct config in tmux.conf

I'll let you figure out 1 for yourself.

For LESS, here's my config:

LESS="--ignore-case --status-column --LONG-PROMPT --RAW-CONTROL-CHARS"
LESS="$LESS --HILITE-UNREAD --tabs=4 --quit-if-one-screen"
export LESS
export LESS_TERMCAP_mb=$'\E[1;31m'     # begin bold
export LESS_TERMCAP_md=$'\E[1;36m'     # begin blink
export LESS_TERMCAP_me=$'\E[0m'        # reset bold/blink
export LESS_TERMCAP_so=$'\E[01;44;33m' # begin reverse video
export LESS_TERMCAP_se=$'\E[0m'        # reset reverse video
export LESS_TERMCAP_us=$'\E[1;32m'     # begin underline
export LESS_TERMCAP_ue=$'\E[0m'        # reset underline
export PAGER=less

For tmux, here's the relevant config (assuming you've already configured your mouse correctly)

# Options for: nhdaly/tmux-better-mouse-mode
set -g @scroll-down-exit-copy-mode "on"
set -g @scroll-without-changing-pane "on"
set -g @scroll-in-moused-over-pane "on"
set -g @scroll-speed-num-lines-per-scroll "3"
set -g @emulate-scroll-for-no-mouse-alternate-buffer "on"

set -g @plugin 'nhdaly/tmux-better-mouse-mode'