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#!/usr/bin/env bash
CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
# used to match output from `tmux list-keys`
KEY_BINDING_REGEX="bind-key[[:space:]]\+\(-r[[:space:]]\+\)\?\(-T prefix[[:space:]]\+\)\?"
is_osx() {
local platform=$(uname)
[ "$platform" == "Darwin" ]
}
iterm_terminal() {
[[ "$TERM_PROGRAM" =~ ^iTerm ]]
}
command_exists() {
local command="$1"
type "$command" >/dev/null 2>&1
}
# returns prefix key, e.g. 'C-a'
prefix() {
tmux show-option -gv prefix
}
# if prefix is 'C-a', this function returns 'a'
prefix_without_ctrl() {
local prefix="$(prefix)"
echo "$prefix" | cut -d '-' -f2
}
option_value_not_changed() {
local option="$1"
local default_value="$2"
local option_value=$(tmux show-option -gv "$option")
[ "$option_value" == "$default_value" ]
}
server_option_value_not_changed() {
local option="$1"
local default_value="$2"
local option_value=$(tmux show-option -sv "$option")
[ "$option_value" == "$default_value" ]
}
key_binding_not_set() {
local key="$1"
if $(tmux list-keys | grep -q "${KEY_BINDING_REGEX}${key}[[:space:]]"); then
return 1
else
return 0
fi
}
key_binding_not_changed() {
local key="$1"
local default_value="$2"
if $(tmux list-keys | grep -q "${KEY_BINDING_REGEX}${key}[[:space:]]\+${default_value}"); then
# key still has the default binding
return 0
else
return 1
fi
}
main() {
# OPTIONS
# enable utf8 (option removed in tmux 2.2)
tmux set-option -g utf8 on 2>/dev/null
# enable utf8 in tmux status-left and status-right (option removed in tmux 2.2)
tmux set-option -g status-utf8 on 2>/dev/null
# address vim mode switching delay (http://superuser.com/a/252717/65504)
if server_option_value_not_changed "escape-time" "500"; then
tmux set-option -s escape-time 0
fi
# increase scrollback buffer size
if option_value_not_changed "history-limit" "2000"; then
tmux set-option -g history-limit 50000
fi
# tmux messages are displayed for 4 seconds
if option_value_not_changed "display-time" "750"; then
tmux set-option -g display-time 4000
fi
# refresh 'status-left' and 'status-right' more often
if option_value_not_changed "status-interval" "15"; then
tmux set-option -g status-interval 5
fi
# required (only) on OS X
if is_osx && command_exists "reattach-to-user-namespace" && option_value_not_changed "default-command" ""; then
tmux set-option -g default-command "reattach-to-user-namespace -l $SHELL"
fi
# upgrade $TERM, tmux 1.9
if option_value_not_changed "default-terminal" "screen"; then
tmux set-option -g default-terminal "screen-256color"
fi
# upgrade $TERM, tmux 2.0+
if server_option_value_not_changed "default-terminal" "screen"; then
tmux set-option -s default-terminal "screen-256color"
fi
# emacs key bindings in tmux command prompt (prefix + :) are better than
# vi keys, even for vim users
tmux set-option -g status-keys emacs
# focus events enabled for terminals that support them
tmux set-option -g focus-events on
# super useful when using "grouped sessions" and multi-monitor setup
if ! iterm_terminal; then
tmux set-window-option -g aggressive-resize on
fi
# DEFAULT KEY BINDINGS
local prefix="$(prefix)"
local prefix_without_ctrl="$(prefix_without_ctrl)"
# if C-b is not prefix
if [ $prefix != "C-b" ]; then
# unbind obsolete default binding
if key_binding_not_changed "C-b" "send-prefix"; then
tmux unbind-key C-b
fi
# pressing `prefix + prefix` sends <prefix> to the shell
if key_binding_not_set "$prefix"; then
tmux bind-key "$prefix" send-prefix
fi
fi
# If Ctrl-a is prefix then `Ctrl-a + a` switches between alternate windows.
# Works for any prefix character.
if key_binding_not_set "$prefix_without_ctrl"; then
tmux bind-key "$prefix_without_ctrl" last-window
fi
# easier switching between next/prev window
if key_binding_not_set "C-p"; then
tmux bind-key C-p previous-window
fi
if key_binding_not_set "C-n"; then
tmux bind-key C-n next-window
fi
# source `.tmux.conf` file - as suggested in `man tmux`
if key_binding_not_set "R"; then
tmux bind-key R run-shell ' \
tmux source-file ~/.tmux.conf > /dev/null; \
tmux display-message "Sourced .tmux.conf!"'
fi
}
main