tmux.conf

###########################
#  TMUX Configuration
#  migrated to tmux 2.9 August 10, 2019
#  minimum version supported is tmux 2.6
###########################

# get tmux version without decimal points: 1.8 becomes 18, 2.1 becomes 21, etc.
# this way we can test the version with pure shell, not needing bc(1) for floating point test
run-shell "tmux setenv -g TMUX_VERSION $(tmux -V | tr -dc '[0-9]')"
run-shell "tmux setenv -g STATUS_MEM_CMD 'set $(free -ht|tail -1) && echo $3 of $2'"

# use 256 term for pretty colors
set -g default-terminal "screen-256color"

# allow terminals to set the title
set -ga terminal-overrides ',xterm*:XT:smcup@:rmcup@,rxvt*:XT,urxvt*:XT'
set -g set-titles on
set -g set-titles-string "#T"

# use bash
# setting default-shell causes tmux to start a login shell, which is arguably wrong
# setting default-command causes tmux to start a non-login, interactive shell
set -g default-shell "/bin/bash"
#set -g default-shell "/usr/bin/fish"
#set -g default-command "/usr/bin/fish"
#set -g default-command "/opt/homebrew/bin/bash"

# OSX ONLY # enable pbcopy and pbpaste
# https://github.com/ChrisJohnsen/tmux-MacOSX-pasteboard/blob/master/README.md
# set -g default-command "reattach-to-user-namespace -l bash"

# increase scroll-back history
set -g history-limit 10000

# use emacs key bindings
setw -g mode-keys emacs
set -g status-keys emacs

# enable mouse copy/paste
set -g mouse on

# decrease command delay (increases vim responsiveness)
set -sg escape-time 1

# increase repeat time for repeatable commands
set -g repeat-time 1000

# increase the status line display time
set -g display-time 1000

# start window and pane indices at 1
set -g base-index 1
setw -g pane-base-index 1

# highlight window when it has new activity
setw -g monitor-activity on
set -g visual-activity on

# re-number windows when one is closed.
# set -g renumber-windows on

# OSX ONLY # enable pbcopy and pbpaste
# https://github.com/ChrisJohnsen/tmux-MacOSX-pasteboard/blob/master/README.md
# set -g default-command "reattach-to-user-namespace -l bash"

#################################################################################
#  Key Bindings
#################################################################################

# tmux prefix set to backtick. This is rarely used for anything else, and it's less fingers than CTRL-A
# also, `1 `2 `3 chooses windows really quickly.
unbind C-b
set -g prefix `
bind ` send-prefix

# command prompt on both colon and semi-colon, makes it reachable without SHIFT key
bind : command-prompt
bind \; command-prompt

# swap the PREFIX key around.
# sometimes you need the backtick, so use f11 and f12 to quickly change from one to the other.
# f11 bound to set prefix to backtick
# f12 bound to set prefix to CTRL-A
bind -n F11 set -g prefix ` \; bind ` send-prefix
bind -n F12 set -g prefix C-a \; bind C-a send-prefix


# To copy:
if-shell -b 'test $TMUX_VERSION -lt 24' \
  'bind -t emacs-copy M-w copy-pipe "xclip -i -sel p -f | xclip -i -sel c" \; display-message "copied to system clipboard"' \
  'bind -T copy-mode M-w send -X copy-pipe "xclip -i -sel p -f | xclip -i -sel c" \; display-message "copied to system clipboard"'

# To paste:
unbind C-y
bind -n C-y run "xclip -o | tmux load-buffer - ; tmux paste-buffer"

unbind C-v
bind -n C-v run "tmux save-buffer - | xclip -i -sel p -f | xclip -i -sel c -f | tmux load-buffer - ; tmux paste-buffer"

# window splitting
unbind %
unbind '"'
bind | split-window -h -c "#{pane_current_path}"
bind '\' split-window -h -c "#{pane_current_path}"
bind - split-window -v -c "#{pane_current_path}"
if-shell -b 'test $TMUX_VERSION -le 28' \
  'bind "\\" split-window -h' \
  'bind "\\" split-window -h -c "#{pane_current_path}"'

# vi hjkl pane travel
bind h select-pane -L
bind j select-pane -D
bind k select-pane -U
bind l select-pane -R

# resize panes
bind -r H resize-pane -L 5
bind -r J resize-pane -D 5
bind -r K resize-pane -U 5
bind -r L resize-pane -R 5

# quickly switch panes
unbind C-j
bind / last-pane
bind < select-pane -t :.-
bind > select-pane -t :.+
bind , select-pane -t :.- # <
bind . select-pane -t :.+ # >

# toggle synchronize typing in panes
bind y setw synchronize-panes

# bind some window control keys
bind = new-window
bind + new-window
bind x kill-pane
bind X kill-window
bind n command-prompt 'rename-window %%'
bind N command-prompt 'rename-session %%'

# man pages
unbind m
bind m command-prompt "split-window 'man %%'"

# force a reload of the config file
unbind r
bind r source-file ~/.tmux.conf \; display ".tmux.conf Reloaded!"

###########################
# Status Bar
###########################

# enable UTF-8 support in status bar for versions less than 2.2.
if-shell -b 'test $TMUX_VERSION -lt 22' '\
    set -g utf8 on ;\
    set -g status-utf8 on ;\
    set -g mouse-utf8 on'

# set refresh interval for status bar
set -g status-interval 30

# center the status bar
set -g status-justify left

# show session name in green, then window:pane in left status bar
set -g status-left-length 40
set -g status-left '#[fg=green]#S#[fg=yellow] #I:#P#[default] '

# show hostname, load, date, time in the right bar
set -g status-right-length  1000
#  'set -g status-right "#[default]| #[fg=green]#h#[default] | #[fg=red,bright]used: #(~/bin/tmux-mem.sh)#[default] | #[fg=yellow,bright]load: #(cut -f1 -d\" \" /proc/loadavg)#[default] | %A %Y-%m-%d %H:%M "'
if-shell -b '[ -x ~/bin/tmux-mem.sh ]' \
  'set -g status-right "#[default]| #[fg=green]#h#[default] | #[fg=red,bright]used: #($STATUS_MEM_CMD)#[default] | #[fg=yellow,bright]load: #(cut -f1 -d\" \" /proc/loadavg)#[default] | %A %Y-%m-%d %H:%M "' \
  'set display-time 5000 ;\
   display "install ~/bin/tmux-mem.sh to see memory free" ;\
   set -u display-time ;\
   set -g status-right "#[default]| #[fg=green]#h#[default] | #[fg=yellow,bright]load: #(cut -f1 -d\" \" /proc/loadavg)#[default] | %A %Y-%m-%d %H:%M "'

###########################
# Colors
###########################

if-shell -b 'test $TMUX_VERSION -le 28' \
    " \
        set -g status-bg colour235 ;\
        set -g status-fg yellow ;\
        set -g status-attr dim ;\
        set-window-option -g window-status-fg brightblue ;\
        set-window-option -g window-status-bg colour236 ;\
        set-window-option -g window-status-attr dim ;\
        set-window-option -g window-status-current-fg brightred ;\
        set-window-option -g window-status-current-bg colour236 ;\
        set-window-option -g window-status-current-attr bright ;\
        set -g pane-border-fg blue ;\
        set -g pane-border-bg black ;\
        set -g pane-active-border-fg green ;\
        set -g pane-active-border-bg black ;\
    "
if-shell -b 'test $TMUX_VERSION -ge 29' \
    " \
        set -g status-style bg=colour235,fg=yellow,dim ;\
        set -g window-status-style bg=colour236,fg=brightblue,dim ;\
        set -g window-status-current-style bg=colour236,fg=brightred,bright ;\
        set -g window-status-current-style bg=colour236,fg=brightred,bright ;\
    "