Number of columns incorrectly set in speedy mode

[frafra]

If there are 3 arguments, and the total number of available columns in C, the third pane has C/2 columns (half the size), the second pane has (2/3)*(C/2) columns (two-sixth), and the first one has (1/3)*(C/2) columns (a sixth).

This seems to happen only in speedy mode -s or -ss, independently of the layout chosen (but it is easier to view in ev mode).

$ tmux -V
tmux 2.9a
$ xpanes -V
xpanes 4.1.1
$ lsb_release -sd
"Fedora release 31 (Thirty One)"

[greymd]

Thanks a lot. I could also reproduce this issue on macOS. I will working on it soon.

$ xpanes -l ev -c 'stty size' 1 2 3

[greymd]

@frafra Try this workaround for a while, as it may take some time to fix this bug. Adding the alias to ~/.bashrc might mitigate this issue (if you use Bash).

_cmd='stty `tmux display-message -p "rows #{pane_height} cols #{pane_width}"`'
alias xpanes="xpanes -B '${_cmd}'"

[greymd]

I could repro the issue without xpanes.

#!/bin/bash

## Create new session of tmux
tmux new-session -d -s "my_session" -d "/bin/sh"
## Split window vertically
tmux split-window -v -t "my_session:0" -h -d "/bin/sh"
tmux split-window -v -t "my_session:0" -h -d "/bin/sh"
tmux split-window -v -t "my_session:0" -h -d "/bin/sh"
## Set layout to vertically lined up
tmux select-layout -t "my_session" even-vertical
## Show all pane id
tmux list-panes -t "my_session" -F "#{pane_id}" | while read -r pane_id; do
    ## Send command to each pane
    tmux send-keys -t "my_session.$pane_id" "stty size" C-m
done

## Attach to session
tmux attach-session -t "my_session"

[greymd]

Open an interactive shell such as /bin/sh, wait a few moments, and the column count will return to normal. Here is the code for reproduction.

#!/bin/bash

## Create new session of tmux
tmux new-session -d -s "my_session" -d "/bin/sh"
## Split window vertically
tmux split-window -v -t "my_session:0" -h -d "/bin/sh"
tmux split-window -v -t "my_session:0" -h -d "/bin/sh"
tmux split-window -v -t "my_session:0" -h -d "/bin/sh"
## Set layout to vertically lined up
tmux select-layout -t "my_session" even-vertical

cmd='printf "%$(tput cols)s\\n" "" | tr " " @'
## Show all pane id
tmux list-panes -t "my_session" -F "#{pane_id}" | while read -r pane_id; do
    ## Send command to each pane
    tmux send-keys -t "my_session.$pane_id" "stty size" C-m
    tmux send-keys -t "my_session.$pane_id" "$cmd" C-m
    tmux send-keys -t "my_session.$pane_id" "sleep 1" C-m
    tmux send-keys -t "my_session.$pane_id" "stty size" C-m
    tmux send-keys -t "my_session.$pane_id" "$cmd" C-m
done

## Attach to session
tmux attach-session -d -t "my_session"

[greymd]

I've tried below workaround, but does not work. It seems terminal size is adjusted after attaching session. Therefore, It is not possible to estimate the actual window size before attaching.

#!/bin/bash

## Create new session of tmux
tmux new-session -d -s "my_session" -d "/bin/sh"
## Split window vertically
tmux split-window -v -t "my_session:0" -h -d "/bin/sh"
tmux split-window -v -t "my_session:0" -h -d "/bin/sh"
tmux split-window -v -t "my_session:0" -h -d "/bin/sh"
## Set layout to vertically lined up
tmux select-layout -t "my_session" even-vertical

cmd='printf "%$(tput cols)s\\n" "" | tr " " @'
tmux list-panes -t "my_session" -F "#{pane_id}" | while read -r pane_id; do

    ##### Adjust new pane size before sending commands
    a="$(tmux display-message -t "my_session:0.$pane_id" -p "rows #{pane_height} cols #{pane_width}")"
    tmux send-keys -t "my_session.$pane_id" "stty $a" C-m

    ## Send command to each pane
    tmux send-keys -t "my_session.$pane_id" "stty size" C-m
    tmux send-keys -t "my_session.$pane_id" "$cmd" C-m
    tmux send-keys -t "my_session.$pane_id" "sleep 1" C-m
    tmux send-keys -t "my_session.$pane_id" "stty size" C-m
    tmux send-keys -t "my_session.$pane_id" "$cmd" C-m
done

## Attach to session
tmux attach-session -d -t "my_session"

[greymd]

I have no idea if this behavior is a bug in tmux or not.

But the fact is that many minor versions of tmux follow this behavior. Therefore, it is worth putting in some mitigation on the xpanes side. A sure way appears to be to force the following command to be executed when the -s option is executed.

stty `tmux display-message -p "rows #{pane_height} cols #{pane_width}"`

[greymd]

More insuitive way to reproduce

$ xpanes -s -lev -c 'printf "%$(tput cols)s\\n" "" | tr " " @' 1 2 3

[greymd]

I noticed that just adding -B 'sleep 1' resolves the issue. Just give tmux time to update the terminal cols and rows.

$ xpanes -s -l ev -c 'printf "%`tput cols`s\\n" "" | tr " " @' 1 2 3 4 5

=> Broken layout

$ xpanes -s -l ev -B 'sleep 1' -c 'printf "%`tput cols`s\\n" "" | tr " " @' 1 2 3 4 5

=> Resolved!