🐇 While checking macos-option-as-alt as a potential source of the problem, I spent time adjusting the Ghostty icon. I changed the app icon. This is how I spend my time being extremely productive.

🐢 Weird. The Option as alt key setting is fine.

🐇 Actually, the Alt key works; the reason we cannot make panes larger is that Alt-Right and Alt-Left are not bound to this.

🐢 You may be right, yes. Then, what’s the key to enlarge a pane?

🦊 List all the keys. Check the keys. You should have done this already.

$ tmux list-keys | rg resize

bind-key    -T prefix       >                      display-menu -T "#[align=centre]#{pane_index} (#{pane_id})" -x P -y P "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Top,}" < { send-keys -X history-top } "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Bottom,}" > { send-keys -X history-bottom } '' "#{?mouse_word,Search For #[underscore]#{=/9/...:mouse_word},}" C-r { if-shell -F "#{?#{m/r:(copy|view)-mode,#{pane_mode}},0,1}" "copy-mode -t=" ; send-keys -X -t = search-backward "#{q:mouse_word}" } "#{?mouse_word,Type #[underscore]#{=/9/...:mouse_word},}" C-y { copy-mode -q ; send-keys -l "#{q:mouse_word}" } "#{?mouse_word,Copy #[underscore]#{=/9/...:mouse_word},}" c { copy-mode -q ; set-buffer "#{q:mouse_word}" } "#{?mouse_line,Copy Line,}" l { copy-mode -q ; set-buffer "#{q:mouse_line}" } '' "#{?mouse_hyperlink,Type #[underscore]#{=/9/...:mouse_hyperlink},}" C-h { copy-mode -q ; send-keys -l "#{q:mouse_hyperlink}" } "#{?mouse_hyperlink,Copy #[underscore]#{=/9/...:mouse_hyperlink},}" h { copy-mode -q ; set-buffer "#{q:mouse_hyperlink}" } '' "Horizontal Split" h { split-window -h } "Vertical Split" v { split-window -v } '' "#{?#{>:#{window_panes},1},,-}Swap Up" u { swap-pane -U } "#{?#{>:#{window_panes},1},,-}Swap Down" d { swap-pane -D } "#{?pane_marked_set,,-}Swap Marked" s { swap-pane } '' Kill X { kill-pane } Respawn R { respawn-pane -k } "#{?pane_marked,Unmark,Mark}" m { select-pane -m } "#{?#{>:#{window_panes},1},,-}#{?window_zoomed_flag,Unzoom,Zoom}" z { resize-pane -Z }
bind-key    -T prefix       z                      resize-pane -Z
bind-key -r -T prefix       M-Up                   resize-pane -U 5
bind-key -r -T prefix       M-Down                 resize-pane -D 5
bind-key -r -T prefix       M-Left                 resize-pane -L 5
bind-key -r -T prefix       C-Up                   resize-pane -U
bind-key -r -T prefix       C-Down                 resize-pane -D
bind-key -r -T prefix       C-Left                 resize-pane -L
bind-key -r -T prefix       C-Right                resize-pane -R
bind-key    -T root         MouseDown3Pane         if-shell -F -t = "#{||:#{mouse_any_flag},#{&&:#{pane_in_mode},#{?#{m/r:(copy|view)-mode,#{pane_mode}},0,1}}}" { select-pane -t = ; send-keys -M } { display-menu -T "#[align=centre]#{pane_index} (#{pane_id})" -t = -x M -y M "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Top,}" < { send-keys -X history-top } "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Bottom,}" > { send-keys -X history-bottom } '' "#{?mouse_word,Search For #[underscore]#{=/9/...:mouse_word},}" C-r { if-shell -F "#{?#{m/r:(copy|view)-mode,#{pane_mode}},0,1}" "copy-mode -t=" ; send-keys -X -t = search-backward "#{q:mouse_word}" } "#{?mouse_word,Type #[underscore]#{=/9/...:mouse_word},}" C-y { copy-mode -q ; send-keys -l "#{q:mouse_word}" } "#{?mouse_word,Copy #[underscore]#{=/9/...:mouse_word},}" c { copy-mode -q ; set-buffer "#{q:mouse_word}" } "#{?mouse_line,Copy Line,}" l { copy-mode -q ; set-buffer "#{q:mouse_line}" } '' "#{?mouse_hyperlink,Type #[underscore]#{=/9/...:mouse_hyperlink},}" C-h { copy-mode -q ; send-keys -l "#{q:mouse_hyperlink}" } "#{?mouse_hyperlink,Copy #[underscore]#{=/9/...:mouse_hyperlink},}" h { copy-mode -q ; set-buffer "#{q:mouse_hyperlink}" } '' "Horizontal Split" h { split-window -h } "Vertical Split" v { split-window -v } '' "#{?#{>:#{window_panes},1},,-}Swap Up" u { swap-pane -U } "#{?#{>:#{window_panes},1},,-}Swap Down" d { swap-pane -D } "#{?pane_marked_set,,-}Swap Marked" s { swap-pane } '' Kill X { kill-pane } Respawn R { respawn-pane -k } "#{?pane_marked,Unmark,Mark}" m { select-pane -m } "#{?#{>:#{window_panes},1},,-}#{?window_zoomed_flag,Unzoom,Zoom}" z { resize-pane -Z } }
bind-key    -T root         MouseDrag1Border       resize-pane -M
bind-key    -T root         M-MouseDown3Pane       display-menu -T "#[align=centre]#{pane_index} (#{pane_id})" -t = -x M -y M "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Top,}" < { send-keys -X history-top } "#{?#{m/r:(copy|view)-mode,#{pane_mode}},Go To Bottom,}" > { send-keys -X history-bottom } '' "#{?mouse_word,Search For #[underscore]#{=/9/...:mouse_word},}" C-r { if-shell -F "#{?#{m/r:(copy|view)-mode,#{pane_mode}},0,1}" "copy-mode -t=" ; send-keys -X -t = search-backward "#{q:mouse_word}" } "#{?mouse_word,Type #[underscore]#{=/9/...:mouse_word},}" C-y { copy-mode -q ; send-keys -l "#{q:mouse_word}" } "#{?mouse_word,Copy #[underscore]#{=/9/...:mouse_word},}" c { copy-mode -q ; set-buffer "#{q:mouse_word}" } "#{?mouse_line,Copy Line,}" l { copy-mode -q ; set-buffer "#{q:mouse_line}" } '' "#{?mouse_hyperlink,Type #[underscore]#{=/9/...:mouse_hyperlink},}" C-h { copy-mode -q ; send-keys -l "#{q:mouse_hyperlink}" } "#{?mouse_hyperlink,Copy #[underscore]#{=/9/...:mouse_hyperlink},}" h { copy-mode -q ; set-buffer "#{q:mouse_hyperlink}" } '' "Horizontal Split" h { split-window -h } "Vertical Split" v { split-window -v } '' "#{?#{>:#{window_panes},1},,-}Swap Up" u { swap-pane -U } "#{?#{>:#{window_panes},1},,-}Swap Down" d { swap-pane -D } "#{?pane_marked_set,,-}Swap Marked" s { swap-pane } '' Kill X { kill-pane } Respawn R { respawn-pane -k } "#{?pane_marked,Unmark,Mark}" m { select-pane -m } "#{?#{>:#{window_panes},1},,-}#{?window_zoomed_flag,Unzoom,Zoom}" z { resize-pane -Z }

🐇 resize-pane has keys, but they conflict with C-Right, etc., which are macOS display selection keys. I defined M-S-Right, etc., to resize and M-C-Right, etc., to swap the panes. Defining new keys with M-S…

bind-key -n "M-S-Right" resize-pane -R 10
bind-key -n "M-S-Left" resize-pane -L 10
bind-key -n "M-S-Up" resize-pane -U 10
bind-key -n "M-S-Down" resize-pane -D 10

🐢 We can set keys to swap windows too, maybe to M-C-PageDown, etc. M-PageDown now moves between windows.

🐇 Let’s take a look at the command options:

     swap-window [-d] [-s src-window] [-t dst-window]
                   (alias: swapw)
             This is similar to link-window, except the source and destination windows are swapped.  It is an error if no window exists at src-window.  If -d is given, the new window
             does not become the current window.

             If -s is omitted and a marked pane is present (see select-pane -m), the window containing the marked pane is used rather than the current window.

🐢 The use case will be limited, though.

🐇 Umm, right. Let’s stop procrastinating here.

🐢 It was productive procrastination, though. Now I can resize my tmux panes.

set -g default-shell nu

in .tmux.conf to specify Nushell as the shell, it doesn’t load $env.PATH. It is necessary to specify the shell with:

set -g default-command nu -l

(using the full path to nu) to ensure the shell reads your configuration file.

This script merges all windows from all Tmux sessions into a single session. You must specify the target session as a parameter. If you save the script as merge-tmux-sessions.zsh, you can run it like:

merge-tmux-sessions.zsh my-current-session

It will then move all windows into the session you specify.

#!/bin/zsh

# set -vuex
#
#  Specify the target session

target_session=$1

# Get the list of all sessions

sessions=$(tmux list-sessions -F '#S')

# Iterate through each session

for session in ${(@f)sessions}; do
    if [ "$session" != "$target_session" ]; then
        # Get the list of windows in the current session
        windows=$(tmux list-windows -t $session -F '#I')

        # Move each window to the target session
        for window in ${(@f)windows}; do
            tmux move-window -s ${session}:${window} -t ${target_session}
        done
    fi

done

bind-key -n S-F12 split-window -h -c "#{pane_current_path}" "gt c"

I just hit Shift-F12, and it opens a new pane in the current directory and runs the command.

Add the following to your .tmux.conf:

set-hook -g window-unlinked 'last-window'

Traditionally, applications use the PRIMARY selection, which uses the mouse selection for copying and pasting with the middle mouse button. However, this is becoming less common, so I’ll configure the CLIPBOARD selection used by most modern browsers, applications, and Emacs.

Add the following lines to .tmux.conf:

# move x clipboard into tmux paste buffer
bind < run "xsel -ob | tmux load-buffer - ; tmux paste-buffer "
# move tmux copy buffer into x clipboard
bind > run "( tmux show-buffer | xsel -bi ) && tmux display-message \"ok!\""

The first line sets C-b < in tmux to retrieve the X clipboard contents and paste them. The second line sets C-b > to send the current tmux buffer to the X clipboard for pasting into another application.

If you would still like to use the PRIMARY selection, you can drop the b options from xsel, using xsel -o and xsel -i respectively.