tmux.conf

# set -g status-bg 'colour10'
# prefix = C-a unless we're over ssh
if-shell 'test -z "$SSH_CONNECTION"' \
    'set-option -g prefix C-a'\
    'set-option -g prefix C-b; set status-style "bg=red"'  #; bind-key C-b last-window; bind-key b send-prefix'
# We still want to be able to send C-a to apps, i.e. vim
bind C-a send-keys C-a  # FIXME: This doesn't work in spin

# Longer scrollback
set-option -g history-limit 5000

# Get some colors
# set-option -ga terminal-overrides ',xterm-256color:Tc'
# set -g default-terminal "screen-256color"
set -g default-terminal "${TERM}"
set -as terminal-features ",*:RGB"
set -as terminal-overrides ',*:Smulx=\E[4::%p1%dm'  # undercurl support
set -as terminal-overrides ',*:Setulc=\E[58::2::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'  # underscore colours - needs tmux-3.0

##### Colors
# TokyoNight colors for Tmux

set -g mode-style "fg=#82aaff,bg=#3b4261"

set -g message-style "fg=#82aaff,bg=#3b4261"
set -g message-command-style "fg=#82aaff,bg=#3b4261"

set -g pane-border-style "fg=#3b4261"
# Auto-detect dark/light mode and set active border color accordingly
if-shell "defaults read -g AppleInterfaceStyle 2>/dev/null | grep -q Dark" \
    'set -g pane-active-border-style "fg=#ff8770,bold"' \
    'set -g pane-active-border-style "fg=#ff7339,bold"'

set -g status "on"
set -g status-justify "left"

set -g status-style "fg=#82aaff,bg=#1e2030"

set -g status-left-length "100"
set -g status-right-length "100"

set -g status-left-style NONE
set -g status-right-style NONE

set -g status-left "#[fg=#1b1d2b,bg=#82aaff,bold] #S #[fg=#82aaff,bg=#1e2030,nobold,nounderscore,noitalics]"
set -g status-right "#[fg=#1e2030,bg=#1e2030,nobold,nounderscore,noitalics]#[fg=#82aaff,bg=#1e2030] #{prefix_highlight} #[fg=#3b4261,bg=#1e2030,nobold,nounderscore,noitalics]#[fg=#82aaff,bg=#3b4261] %Y-%m-%d  %I:%M %p #[fg=#82aaff,bg=#3b4261,nobold,nounderscore,noitalics]#[fg=#1b1d2b,bg=#82aaff,bold] #h "
if-shell '[ "$(tmux show-option -gqv "clock-mode-style")" == "24" ]' {
  set -g status-right "#[fg=#1e2030,bg=#1e2030,nobold,nounderscore,noitalics]#[fg=#82aaff,bg=#1e2030] #{prefix_highlight} #[fg=#3b4261,bg=#1e2030,nobold,nounderscore,noitalics]#[fg=#82aaff,bg=#3b4261] %Y-%m-%d  %H:%M #[fg=#82aaff,bg=#3b4261,nobold,nounderscore,noitalics]#[fg=#1b1d2b,bg=#82aaff,bold] #h "
}

setw -g window-status-activity-style "underscore,fg=#828bb8,bg=#1e2030"
setw -g window-status-separator ""
setw -g window-status-style "NONE,fg=#828bb8,bg=#1e2030"
setw -g window-status-format "#[fg=#1e2030,bg=#1e2030,nobold,nounderscore,noitalics]#[default] #I  #W #F #[fg=#1e2030,bg=#1e2030,nobold,nounderscore,noitalics]"
setw -g window-status-current-format "#[fg=#1e2030,bg=#3b4261,nobold,nounderscore,noitalics]#[fg=#82aaff,bg=#3b4261,bold] #I  #W #F #[fg=#3b4261,bg=#1e2030,nobold,nounderscore,noitalics]"

# tmux-plugins/tmux-prefix-highlight support
set -g @prefix_highlight_output_prefix "#[fg=#ffc777]#[bg=#1e2030]#[fg=#1e2030]#[bg=#ffc777]"
set -g @prefix_highlight_output_suffix ""
#####

# Disable Esc timer
set -s escape-time 0

# Forward extended/modified key sequences (CSI u / Kitty keyboard protocol)
# so TUI apps like pi can distinguish e.g. Shift+Enter from plain Enter
set -s extended-keys on
set -as terminal-features 'xterm*:extkeys'

# Housekeeping
set -g base-index 1
set -g mouse on
# set -g prefix2 None
set -g repeat-time 200
set -g visual-bell off
set -g visual-silence off
set-option -g focus-events on

# Vim movement
# vim-like pane resizing  
bind -r C-K resize-pane -U 10
bind -r C-J resize-pane -D 10
bind -r C-H resize-pane -L 10
bind -r C-L resize-pane -R 10

# vim-like pane switching
bind -r k select-pane -U 
bind -r j select-pane -D 
bind -r h select-pane -L 
bind -r l select-pane -R 

# and now unbind keys
unbind Up
unbind Down
unbind Left
unbind Right

unbind C-Up
unbind C-Down
unbind C-Left
unbind C-Right

# Esc is applied right away
set -sg escape-time 0

# When creating new windows or splits, keep the cwd
bind '"' split-window -c "#{pane_current_path}"
bind % split-window -h -c "#{pane_current_path}"
bind c new-window -c "#{pane_current_path}"

# Smart pane switching with awareness of vim splits
# Taken from https://github.com/rygwdn/dotfiles/blob/master/tmux.conf#L78-L108
contains_nested_or_vim='echo "#{pane_current_command}" | grep -iqE "(^|\/)g?(view|n?vim?)(diff)?$" || echo "#{pane_title}" | grep -iqE "^(vim\[.*\]$|tmux-ssh)"'

bind -n C-h if-shell "$contains_nested_or_vim" "send-keys C-h" {
    if-shell 'test "#{pane_at_left}" = 1 -a -n "$SSH_CONNECTION" -a -S /tmp/tmux-host-socket' \
        {run-shell 'tmux -S /tmp/tmux-host-socket select-pane -L'} \
        "select-pane -L"
}
bind -n C-j if-shell "$contains_nested_or_vim" "send-keys C-j" {
    if-shell 'test "#{pane_at_bottom}" = 1 -a -n "$SSH_CONNECTION" -a -S /tmp/tmux-host-socket' \
        {run-shell 'tmux -S /tmp/tmux-host-socket select-pane -D'} \
        "select-pane -D"
}
bind -n C-k if-shell "$contains_nested_or_vim" "send-keys C-k" {
    if-shell 'test "#{pane_at_top}" = 1 -a -n "$SSH_CONNECTION" -a -S /tmp/tmux-host-socket' \
        {run-shell 'tmux -S /tmp/tmux-host-socket select-pane -U'} \
        "select-pane -U"
}
bind -n C-l if-shell "$contains_nested_or_vim" "send-keys C-l" {
    if-shell 'test "#{pane_at_right}" = 1 -a -n "$SSH_CONNECTION" -a -S /tmp/tmux-host-socket' \
        {run-shell 'tmux -S /tmp/tmux-host-socket select-pane -R'} \
        "select-pane -R"
}

# List of plugins
set -g @plugin 'tmux-plugins/tpm'
set -g @plugin 'tmux-plugins/tmux-resurrect'
set -g @plugin 'tmux-plugins/tmux-continuum'
set -g @plugin 'tmux-plugins/tmux-yank'
set -g @plugin 'laktak/extrakto'
set -g @plugin 'christoomey/vim-tmux-navigator'
# TODO: Also export custom theme to dotfiles
# set -g @plugin 'erikw/tmux-powerline'

# Initialize Tmux Package Manager
if "test ! -d ~/.tmux/plugins/tpm" \
   "run 'git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm && ~/.tmux/plugins/tpm/bin/install_plugins'"
run -b '~/.tmux/plugins/tpm/tpm'

# Make tmux restore the last saved session on start
set -g @continuum-restore 'on'