#
# ~/.tmux.conf
#
# Tips
# ----
# * With mouse mode enabled, it is not allowed to select text with mouse.
#   However, pressing "Shift" key while doing things with the mouse will
#   overrides the mouse protocol and lets you select/paste.  This behavior
#   is documented in xterm(1) and also supported by most terminals.
#   Credit: https://unix.stackexchange.com/a/332425
#

# Start window and pane numbering at 1
set -g base-index 1
setw -g pane-base-index 1

# Renumber the windows when a window is closed
set -g renumber-windows on

# Automatically set window title
set -g set-titles on
setw -g automatic-rename on
# Don't allow programs to change the window name
set -g allow-rename off

# Use vi-style key bindings in the status line
set -g status-keys vi
# Use vi-style key bindings in copy and choice modes
setw -g mode-keys vi

# Disable the delay between an escape key press and subsequent characcters
set -sg escape-time 0

# Increase the scrollback history limit
set -g history-limit 10000

# Lock after 15 minutes
#set -g lock-after-time 1800

# Keep windows around after they exit
# On exit, the pane will display the message "Pane is dead" until it is
# closed with the command "kill-pane" or "kill-window", or a new command
# is started there with "respawn-pane" or "respawn-window".
#set -g remain-on-exit on

# Turn on xterm-keys so that additional function keys get escape sequences
set -g xterm-keys on

set -g default-terminal "tmux-256color"

# Enable true (RGB) color
set -sa terminal-overrides ",xterm*:Tc"
# Override terminal's default Cr (color reset) to avoid the strange
# 'char+112' when just exited the tmux session.
# Credit: https://github.com/tmux/tmux/issues/266
set -sa terminal-overrides ',xterm*:Cr=\E]12;gray\007'


##
## Key bindings
##

# Change the prefix key to C-a
set -g prefix C-a
unbind C-b
bind C-a send-prefix

# Get the command prompt more quickly
unbind \;
bind \; command-prompt

# Detach tmux instead of exit
bind -n C-d detach

# Sane window split keybinds
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}'

# Pane switching
bind h select-pane -L
bind j select-pane -D
bind k select-pane -U
bind l select-pane -R
bind -n M-Left  select-pane -L
bind -n M-Right select-pane -R
bind -n M-Up    select-pane -U
bind -n M-Down  select-pane -D

# Pane resizing
bind -r M-h resize-pane -L 5
bind -r M-j resize-pane -D 5
bind -r M-k resize-pane -U 5
bind -r M-l resize-pane -R 5

# Create new window starting from the current directory
bind c  new-window -c '#{pane_current_path}'
# URxvt tab like window control
bind -n S-Down  new-window -c '#{pane_current_path}'
bind -n S-Left  previous-window
bind -n S-Right next-window
bind -n C-Left  swap-window -t -1
bind -n C-Right swap-window -t +1

# Enable/disable mouse mode
bind m set mouse\; display 'Toggled mouse #{?mouse,on,off} (this session)'
bind M set -g mouse\; display 'Globally toggled mouse #{?mouse,on,off}'

# Keys to toggle monitoring activity in a window, and synchronize-panes
#bind m set monitor-activity
bind S set synchronize-panes\; display 'synchronize-panes #{?synchronize-panes,on,off}'

# Reload Tmux configuration
bind R source-file ~/.tmux.conf\; display "Configuration reloaded."

# Do not display the original window's name when renaming it
bind , command-prompt -p "(rename-window '#W')" "rename-window '%%'"
# Do the same for session renaming
bind '$' command-prompt -p "(rename-session '#S')" "rename-session '%%'"

# Save all scrollback to a file
# Credit: https://unix.stackexchange.com/a/26568
bind P command-prompt -p 'save history to filename:' \
    -I '~/tmux.history' 'capture-pane -S - ; save-buffer %1 ; delete-buffer'

# Copy & paste
bind Escape copy-mode
bind p paste-buffer


##
## Appearance
##

# Status line
set -g status-justify      centre
set -g status-left-length  30
set -g status-right-length 30
set -g status-style        "bg=default,bold"
set -g status-left \
    "#[fg=magenta][#[fg=yellow]#h:#[fg=blue]#S#[fg=magenta]]#[default]"
set -g status-right \
    "#[fg=magenta][#[fg=green]%a #[fg=yellow]%b %d #[fg=blue]%H:%M#[fg=magenta]]"

# If running inside tmux ($TMUX is set), then change the status line to red
#if-shell -b '[ -n "$TMUX" ]' "set -g status-bg red"

# Window status
setw -g window-status-separator      " "
setw -g window-status-style          "fg=blue,bold"
setw -g window-status-current-style  "fg=green,bold,reverse"
setw -g window-status-last-style     "fg=magenta,bold"
setw -g window-status-activity-style "fg=yellow,bold"
setw -g window-status-bell-style     "fg=red,bold"
setw -g window-status-format \
    "#[fg=yellow]#I:#[default]#{=10:window_name}#F"
setw -g window-status-current-format \
    "#[fg=yellow]#I:#[fg=default]#W#F"

# Window mode
setw -g mode-style        "fg=yellow,bg=default,bold"
setw -g clock-mode-colour green
setw -g clock-mode-style  24

# Messaging
set -g message-style         "fg=white,bg=blue,bold"
set -g message-command-style "fg=white,bg=default,bold"

# Highlight windows with activity in the status line
setw -g monitor-activity on
# Disable bell action and activity messages
set -g bell-action none
set -g visual-activity off

# Pane
set -g pane-border-style        "fg=default,bg=default"
set -g pane-active-border-style "fg=blue,bg=default"


##
## Deal with different syntax between different versions!
##

# Credit: https://stackoverflow.com/a/40902312/1046584
run-shell "tmux setenv -g TMUX_VERSION $(tmux -V | cut -c 6-)"

# In version 2.1 "mouse" replaced the previous 4 mouse options
if-shell -b '[ "$(echo "$TMUX_VERSION >= 2.1" | bc)" = 1 ]' \
   "set -g mouse on"

# UTF8 is autodetected in 2.2 onwards, but errors if explicitly set
if-shell -b '[ "$(echo "$TMUX_VERSION < 2.2" | bc)" = 1 ]' \
   "set -g utf8 on; set -g status-utf8 on; set -g mouse-utf8 on"

# New keybindings for vi-mode
# Credit: https://shapeshed.com/custom-vim-bindings-in-tmux-2-4/
# See also: https://github.com/tmux/tmux/issues/754
if-shell -b '[ "$(echo "$TMUX_VERSION >= 2.4" | bc)" = 1 ]' \
   "unbind -T copy-mode-vi MouseDragEnd1Pane; \
    bind -T copy-mode-vi 'v' send -X begin-selection; \
    bind -T copy-mode-vi 'V' send -X select-line; \
    bind -T copy-mode-vi 'r' send -X rectangle-toggle; \
    bind -T copy-mode-vi 'y' send -X copy-pipe-and-cancel \
        'xclip -in -selection clipboard'"
if-shell -b '[ "$(echo "$TMUX_VERSION < 2.4" | bc)" = 1 ]' \
   "unbind -t vi-copy MouseDragEnd1Pane; \
    bind -t vi-copy Escape cancel; \
    bind -t vi-copy v begin-selection; \
    bind -t vi-copy V select-line; \
    bind -t vi-copy r rectangle-toggle; \
    bind -t vi-copy y copy-pipe 'xclip -in -selection clipboard'"


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