tmux.conf

# Tmux Cheatsheets:
# - https://devhints.io/tmux
# - https://gist.github.com/MohamedAlaa/2961058

## Terminal type configuration
# https://unix.stackexchange.com/a/171900
# https://github.com/tmux/tmux/issues/1246
set-option -g default-shell $SHELL
set -g default-terminal "screen-256color"
# favor tmux-256color over screen-256color - you get italic! (https://github.com/gpakosz/.tmux/blob/master/.tmux.conf)
if 'infocmp -x tmux-256color > /dev/null 2>&1' 'set -g default-terminal "tmux-256color"'

# favor RGB over Tc for tmux 3.2 or later - https://github.com/tmux/tmux/wiki/FAQ#how-do-i-use-rgb-colour
set-option -ga terminal-overrides ",*-256color*:RGB"
set-option -ga terminal-overrides ",alacritty:RGB"

# https://github.com/chriskempson/base16-shell/pull/214
set -g allow-passthrough on

# less delay with tmux key bindings
set -s escape-time 10
# window index start from 1 instead 0
set -g base-index 1
# pane index start from 1 instead 0
setw -g pane-base-index 1

# let fzf pop up on temp panel
FZF_TMUX=1

# to make sure something like fpp to pick up nvim instead of whatever the default
EDITOR=nvim

# if run as "tmux attach", create a session if one does not already exist
new-session -n $HOST

# position to top
set -g status-position top

# use OSC 52 - https://github.com/tmux/tmux/wiki/Clipboard
# also read https://medium.com/free-code-camp/tmux-in-practice-integration-with-system-clipboard-bcd72c62ff7b
set -g set-clipboard on # test via `printf "\033]52;c;$(printf "%s" "hello" | base64)\a"`

## List of plugins
# this allows installing other plugins `prefix I` to install plugins after listing them here
set -g @plugin 'tmux-plugins/tpm'
# A set of tmux options that should be acceptable to everyone.
set -g @plugin 'tmux-plugins/tmux-sensible'
# allows users to select actions from a customizable popup menu 🧰
set -g @plugin 'alexwforsythe/tmux-which-key'

# indicate modes you are in (normal/prefix, copy/insert)
set -g @plugin 'dominikduda/tmux_mode_indicator'
set -g @tmux_mode_indicator_left_edge_character ""
set -g @tmux_mode_indicator_separator "✤"
set -g @tmux_mode_indicator_background "colour110"
set -g @tmux_mode_indicator_right_edge_character ""
set -g @tmux_mode_indicator_right_edge_character_fg "colour0"
set -g @tmux_mode_indicator_left_edge_character_bg "colour0"
set -g @tmux_mode_indicator_after_interpolation_bg "colour0"
set -g @tmux_mode_indicator_after_interpolation_fg "colour0"
set -g @tmux_mode_indicator_prefix_pressed_bg "colour110"
set -g @tmux_mode_indicator_prefix_pressed_fg "colour124"
set -g @tmux_mode_indicator_copy_mode_bg "colour110"
set -g @tmux_mode_indicator_copy_mode_fg "colour122"

# allowing to navigate with C-hjkl between panes
# set -g @plugin 'christoomey/vim-tmux-navigator' - now I'm using my own with below;
# based on https://github.com/christoomey/vim-tmux-navigator?tab=readme-ov-file#add-a-snippet
# but with the modification to let also zellij to handle the keys
# since I use zellij within Tmux and https://github.com/hiasr/vim-zellij-navigator with zellij

# also pass through to ssh as well as zellij
is_zellij="ps -o state= -o comm= -t '#{pane_tty}' \
  | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(zellij|ssh)$'"

# let zellij's muscle memory also works for tmux when there is no zellij to control `send-keys -K` does the magic
bind-key -n 'C-b' if-shell "$is_zellij" { send-keys C-b } { send-keys -K C-a }

is_vim="ps -o state= -o comm= -t '#{pane_tty}' \
  | grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|l?n?vim?x?|fzf)(diff)?$'"

# in case it's zellij, execute both select-pane and send-keys as I prefer both action to happens than no action happens at all
bind-key -n 'C-h' if-shell "$is_zellij" { send-keys C-h; select-pane -L } {
  # this is same as the vim-tmux-navigator
  if-shell "$is_vim" {send-keys C-h} {select-pane -L}
}
bind-key -n 'C-j' if-shell "$is_zellij" { send-keys C-j; select-pane -D } {
  if-shell "$is_vim" {send-keys C-j} {select-pane -D}
}
bind-key -n 'C-k' if-shell "$is_zellij" { send-keys C-k; select-pane -U } {
  if-shell "$is_vim" {send-keys C-k} {select-pane -U}
}
bind-key -n 'C-l' if-shell "$is_zellij" { send-keys C-l; select-pane -R } {
  if-shell "$is_vim" {send-keys C-l} {select-pane -R}
}

# `prefix f` to select a file to open from current pane
set -g @plugin 'tmux-plugins/tmux-fpp'
set -g @fpp-path "${XDG_CONFIG_HOME}/dfs-rhc/bin/path/default/wrapped-fpp"
# `prefix u` to select a url to open from current pane
set -g @plugin 'tmux-plugins/tmux-urlview'
# allowing you to copy to the system clipboard (not with OSC 52)
set -g @plugin 'tmux-plugins/tmux-yank'
# allowing you to have better mouse mode
set -g @plugin 'nhdaly/tmux-better-mouse-mode'
# `prefix tsv` to manipulate panes
set -g @plugin 'jabirali/tmux-tilish'
# allowing you to move and resize panes via `prefix (shift +) hjkl`
set -g @plugin 'tmux-plugins/tmux-pain-control'

# `prefix j` to jump to text
# set -g @plugin 'schasse/tmux-jump'
# replacing tmux-jump since `tmux-easymotion` uses python and `tmux-jump` uses ruby;
# and my environment very likely have python already but unlikely to have ruby by default
set -g @plugin 'ddzero2c/tmux-easymotion'
set -g @easymotion-key 'j' # trigger with `prefix j`

# `prefix tab` to toggle looking at files as tree in current pane
set -g @plugin 'tmux-plugins/tmux-sidebar'

## disabling until I really need it and know how to set up properly
# allowing saving and restoring sessions working together with `tmux-continuum`
# set -g @plugin 'tmux-plugins/tmux-resurrect'
# set -g @plugin 'tmux-plugins/tmux-continuum'
# set -g @continuum-restore 'on'

# allowing a use of tmux-themepack
set -g @plugin 'jimeh/tmux-themepack'
# powerline theme
set -g @powerline-color-grey-1 colour0 # to make background "clear"
set -g @themepack 'powerline/block/cyan'


# Enable mouse control (clickable windows, panes, resizable panes)
set -g focus-events on
set -g mouse on

# customizing via tmux-better-mouse-mode
set -g @emulate-scroll-for-no-mouse-alternate-buffer on
set -g @scroll-speed-num-lines-per-scroll "1"

# comment out this whole chunk for now since somehow this is not necessary to me (undercurl works without it)
# and also this even brings "too much attention" to SpellBad with red undercurl by default at least with with alacritty
#
# ## undercurl support - https://evantravers.com/articles/2021/02/05/curly-underlines-in-kitty-tmux-neovim/
# ## one use case - for my neovim SpellBad highlight to work as currently it's `cterm=undercurl gui=undercurl guisp=#dc322f`
# # undercurl support
# set -as terminal-overrides ',*:Smulx=\E[4::%p1%dm'
# # underscore colours - needs tmux-3.0
# set -as terminal-overrides ',*:Setulc=\E[58::2::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'

# Enable vi mode - https://sanctum.geek.nz/arabesque/vi-mode-in-tmux/
set-window-option -g mode-keys vi # e.g. navigating session/windows with vi key bindings
bind-key -T copy-mode-vi 'v' send -X begin-selection
bind-key -T copy-mode-vi 'y' send -X copy-selection-and-cancel

# remap prefix from 'C-b' to 'C-a'
unbind C-b
set-option -g prefix C-a
bind-key C-a send-prefix

# split panes using | and -
unbind '"'
unbind %
bind / split-window -h -c "#{pane_current_path}"
bind - split-window -v -c "#{pane_current_path}"
# I actually don't like opening new window with current path so disable for now.
# bind c new-window -c "#{pane_current_path}"

# reload config file (change file location to your the tmux.conf you want to use)
# now there is also tmux-autoreload at the bottom
bind r source-file ~/.tmux.conf

# Initialize TMUX plugin manager (keep this line at the very bottom of tmux.conf)
run '~/.tmux/plugins/tpm/tpm'

# this must be after run tpm line
# set -g status-right '#[fg=colour235,bg=colour233]#[fg=colour240,bg=colour235]#(gitmux -cfg ~/.gitmux.conf "#{pane_current_path}")'

# instead of gitmux, display weather info for now
set -g status-right '#{tmux_mode_indicator}#(tmux-hud-r)'
set -g status-interval 10

# somehow this requires to run after setting the `status-right` above to be able to work properly
run-shell ~/.tmux/plugins/tmux_mode_indicator/tmux_mode_indicator.tmux

# this needs to be at the bottom
set-option -g @plugin 'b0o/tmux-autoreload'

# create a new session within another session
# ctrl + a :new -s <name>
# or ctrl + a :new-session -t <name>
# https://stackoverflow.com/questions/16398850/create-new-tmux-session-from-inside-a-tmux-session#comment47958386_21272658