# Use right thumb finger to press alt and left pinky to press a.

# Make sure that alt keys acts as +Esc in your terminal:

# kitty: `macos_option_as_alt yes`

# Ghostty: `macos-option-as-alt = true`

set -g prefix M-a

# Keep long history

set -g history-limit 1000000

# Fix Vim ESC delay

set -sg escape-time 0

## Panes

# Start windows and panes at 1, not 0

set -g base-index 1

set-window-option -g pane-base-index 1

# Renumber windows after one of them was closed

set-option -g renumber-windows on

# Remove technical information (hostname, time) from tab pane

set -g status-left ''

set -g status-right ''

# Don't ask confirmation about window closing.

bind-key & kill-window

bind-key x kill-pane

# Use hljk for selecting panes

bind h select-pane -L

bind l select-pane -R

bind j select-pane -D

bind k select-pane -U

# Move windows left and right

bind-key H swap-window -d -t -1

bind-key L swap-window -d -t +1

# Highlight panes with recent activity

set-window-option -g monitor-activity on

# Open new splits and new panes in the same directory current pane in

bind '"' split-window -c "#{pane_current_path}"

bind % split-window -h -c "#{pane_current_path}"

bind c new-window -c "#{pane_current_path}"

# Use size of the smallest client only if it is active

set-window-option -g aggressive-resize on

## Mouse and copy mode

# Use vim keys in copy mode

set-window-option -g mode-keys vi

# Mouse is enabled to enable proper selection in multiple panes

set -g mouse on

# Allow selection with mouse

set-option -g word-separators " ()[]{},'\""

unbind-key -T root DoubleClick1Pane

bind-key -T root DoubleClick1Pane select-pane \; copy-mode -M \; send-keys -X select-word

unbind-key -T copy-mode-vi DoubleClick1Pane

bind-key -T copy-mode-vi DoubleClick1Pane send-keys -X select-word

unbind-key -T root TripleClick1Pane

bind-key -T root TripleClick1Pane select-pane \; copy-mode -M \; send-keys -X select-line

unbind-key -T copy-mode-vi TripleClick1Pane

bind-key -T copy-mode-vi TripleClick1Pane send-keys -X select-line

unbind-key -T copy-mode-vi MouseDragEnd1Pane

unbind-key -T copy-mode-vi MouseDown1Pane

bind-key -T copy-mode-vi MouseDown1Pane select-pane \; send-keys -X clear-selection

# Use v in copy mode to start selection and use y to copy text (as in vim)

bind-key -T copy-mode-vi v send-keys -X begin-selection

bind-key -T copy-mode-vi y send-keys -X copy-selection

## Integration with terminals

# Pass OSC 52 and other sequences to external terminal (e.g. kitty)

set -g allow-passthrough on

# When copying in tmux, make tmux use OSC 52 sequences

set -g set-clipboard on

# Make tmux pass key combinations to the apps

# May be not needed since tmux 3.5 but we may have older tmux on servers

#

# Tmux doesn't support kitty's keyboard protocol and would never proxy app's request

# to terminal to enable it. tmux could understand CSI-u sequences, but the problem

# is kitty won't send them unless kitty's keyboard protocol is enabled.

# Ghostty sends CSI-u sequences without explicit request from an app.

# In order to make shift+enter (common combination in AI agents TUI) work in kitty,

# you would need to instruct it to send CSI-u sequence on shift+enter:

# kitty: map shift+enter send_text all \033[13;2u

set -g extended-keys always

set -ag terminal-features ',*:extkeys'

set -g extended-keys-format csi-u

## Status bar

set -g status-position top

set -g status-bg '#000000'

set -g status-fg '#bbbbbb'

set -g window-status-current-style bg=blue,fg='#ffffff'

# You can run tmux on remote host.

# Press "Alt+a a" and any further "Alt+a" will go to tmux on remote host. Temporarily,

# Alt+b will act as prefix on local tmux instance. Press "Alt+b b" to switch back to

# using "Alt+a" as prefix locally.

set -ag status-left '#{?@alt-b-leader,[Alt + b] ,}'

bind-key a \

set prefix M-b \; \

set status-bg '#333333' \; \

set @alt-b-leader 1 \; \

refresh-client -S

bind-key b \

set prefix M-a \; \

set status-bg '#000000' \; \

set @alt-b-leader 0 \; \

refresh-client -S

# We assume that users have macbooks with top notch and that's why we make

# status bar 2-line height.

# Perhaps we could use a better method for this

if-shell '[ $(uname -s) = "Darwin" ]' {

if-shell '! tmux show -gv @default-status-format 2>/dev/null' {

run-shell 'tmux set -g @default-status-format "$(tmux show -gv status-format[0])"'

}

set -g status-format[0] '#{?@alt-b-leader,#{E:@default-status-format},}'

set -g status-format[1] '#{?@alt-b-leader,,#{E:@default-status-format}}'

set -g status 2

bind-key a \

set @alt-b-leader 1 \; \

set status on \; \

set status-bg '#333333' \; \

set prefix M-b \; \

refresh-client -S

bind-key b \

set @alt-b-leader 0 \; \

set status 2 \; \

set status-bg '#000000' \; \

set prefix M-a \; \

refresh-client -S

}

## Load local config

if-shell "[ -f ~/.tmux.conf.local ]" 'source ~/.tmux.conf.local'