dot.tmux.conf

################################################################
# NC notes

# Multiple views into same set of windows. If you attach (`tmux a`) to
# the same session twice, then both views are the same: if you change
# the current window/pane (I don't know the terminology yet) in one
# attachment then view in the other attachment changes also. The
# solution, to get screen-like behavior of separate views, is to
# create a new sesssion:
#
# $ tmux new-session -t <number or name of old session, default 0 for first session>
#
# where `tmux ls` will list existing sessions.
#
# Source:
# http://unix.stackexchange.com/questions/24274/attach-to-different-windows-in-session

# Some things that surprised me:
#
# - tmux shares global state between all sessions on the same tmux
#   server, and the tmux server is automatically created for each
#   user, for the first tmux session they start. You can override this
#   by creating a new socket for your new session using 'tmux -L
#   <name>' or 'tmux -S <path>', and then running tmux the same way
#   for all subsequent commands related to this session. One symptom
#   of the reused sessions is the environment used by tmux for new
#   shells is the one in effect when the server was created, not the
#   one in effect when the session was created (the oppossite of what
#   I want).
#
# - tmux uses login shells by default in each new pane, and login
#   shells do path manipulation and perhaps other env
#   manipulation. You can override tmux to use regular shells -- and
#   hence get less environment disruption -- by setting
#   'default-command' to '$SHELL' in this config file, see below.

################################################################
# NC Keybindings

# My leader (L) is C-o.
#
# - L-z: zoom a pane to full screen, or revert a zoomed pane. Useful
#   before copying with mouse when panes are split with vertical line.
#
# - L-q: show pane numbers on panes. Hitting a number before they
#   disappear -- I changed the delay to 5 seconds below -- will jump
#   to that pane.
#
# - L-<space>: cycle layouts.
#
# - L-<alt>-<n>: switch to layout <n>. There are 5 layouts by default:
#
# - L-/: enter copycat mode, which is copy mode with search
#   highlighting and regexp support. Docs with other key bindings:
#   https://github.com/tmux-plugins/tmux-copycat.
#
# - L-I: install plugins.

################################################################
# NC additions

# Plugin for better copy mode. In particular, it highlights search
# results.
#
# Use L-/ to start a copy cat search. Could rebind L-[, which
# currently points to regular copy mode, to point to copycat instead
# ...
set -g @plugin 'tmux-plugins/tmux-copycat'

# Use shift-<direction> to change panes, as in Emacs.
#
# The '-n' means "don't require the leader (C-o) to be pressed first".
bind -n S-Up    select-pane -U
bind -n S-Down  select-pane -D
bind -n S-Left  select-pane -L
bind -n S-Right select-pane -R

# Time in milliseconds that numbers for `display-panes` are
# displayed. The shortcut for `display-panes` is `<leader> q`. Use
# `<esc>` to cancel display if you don't want to change panes.
set -g display-panes-time 5000
# Colors.
#
# See docs for `message-command-style` for allowed colors. E.g. there
# is no "purple", but there is "magenta".
set -g display-panes-colour magenta
set -g display-panes-active-colour green

# Border colors.
set -g pane-border-style fg=green,bg=default
set -g pane-active-border-style fg=red,bg="#444444",bold

# Fix reverse video (e.g. for highlighting in `less`):
# http://superuser.com/a/891337/73337.
set -g terminal-overrides 'rxvt-unicode*:sitm@,ritm@'

# Default for the `TERM` env var. Setting to `screen-256color` causes
# problems for Emacs: search results longer than two characters are
# hidden, and almost everything is red?!?
#
# Inside Emacs, running `list-colors-display` will show you how many
# colors you have. Outside of Tmux I get a smooth gradient of hundreds
# of colors. Inside Tmux, with `screen-256color` set below I get a
# long list with many repeats, and with `screen` set below I get a
# short list. But neither of them look like the list outside of Tmux.
#
# I ended up with `rxvt-unicode` which has lots of repeated Emacs
# colors like `screen-256color`, but doesn't have the Emacs
# highlighting problem.
#
# WARNING: this setting doesn't seem to take effect until you exit all
# tmuxen you have running!
#
# WEIRDNESS: if I run `tmux -2` instead, to force 256 color mode, then
# I get mostly perfect colors in `emacs -nw`. E.g. Haskell mode
# highlighting is good, and the output of `M-x list-colors-display` is
# a smooth gradient. However, the box around the active window in the
# tmux status bar at the bottom disappears, and in Emacs some fonts
# are too dark to read (it uses dark blue for the mini-buffer).
set -g default-terminal rxvt-unicode

# Resize window to size of current viewer when only one viewer is
# active: https://mutelight.org/practical-tmux.
#
# By default, when two sessions are attached to the same window set
# (no idea what the right terminology is: I mean, when you do `tmux -s
# s1` and then `tmux -s s1 -t s2` to make session s1 and s2 point to
# the same windows), the size of the visible window is determined by
# the smallest of the sessions currently attached. In XMonad, when you
# switch from a split view to a full screen view, tmux keeps the
# window half size until all sessions attached to the window have been
# brought to the front. This option changes that: the window is
# resized each time a session views it, as long as no other session is
# also focusing on it (but you rarely point two sessions at the same
# window at the same time ...).
setw -g aggressive-resize on

# Show process/title for all panes in each window.
set -g pane-border-status bottom

################################################################

# For system clipboard access with Vim
# set-option -g default-command "reattach-to-user-namespace -l bash"

# Use y to copy to system buffer
# bind -t vi-copy y copy-pipe "reattach-to-user-namespace pbcopy"

# split windows like vim
# vim's definition of a horizontal/vertical split is reversed from tmux's
bind s split-window -v
bind v split-window -h

bind ^s split-window -v
bind ^v split-window -h

# move around panes with hjkl, as one would in vim after pressing ctrl-w
bind h select-pane -L
bind j select-pane -D
bind k select-pane -U
bind l select-pane -R

bind ^h select-pane -L
bind ^j select-pane -D
bind ^k select-pane -U
bind ^l select-pane -R

# resize panes like vim
# feel free to change the "1" to however many lines you want to resize by, only
# one at a time can be slow
bind < resize-pane -L 10
bind > resize-pane -R 10
bind - resize-pane -D 10
bind + resize-pane -U 10

# pane movement
bind-key i command-prompt -p "join pane from:"  "join-pane -s '%%'"
bind-key t command-prompt -p "send pane to:"  "join-pane -t '%%'"

# bind : to command-prompt like vim
# this is the default in tmux already
bind : command-prompt

# session management
bind C new-session
bind L choose-session

# vi-style controls for copy mode
setw -g mode-keys vi

# Set the prefix to ^A, like screen.
#
# NC: Or, rather, to ^O like my .screenrc.
unbind C-b
set -g prefix ^O
bind o send-prefix

bind ^o last-window # toggle last window like screen

set -g update-environment "DISPLAY WINDOWID SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION"

bind K confirm kill-server
bind X confirm kill-window

# longer scrollback
set -g history-limit 10000

set -g status-style bg=default,fg=white

# left side of status bar holds "(>- session name -<)"
set -g status-left-length 100
set -g status-left-style bg=green,fg=black,bold
set -g status-left ''

# right side of status bar holds "[host name] (date time)"
set -g status-right-length 100
set -g status-right-style fg=black,bold
set -g status-right '#[fg=colour214,bg=colour235] #H#[fg=colour238]:#[fg=colour178]#S #[fg=yellow,bg=colour238] %y.%m.%d %H:%M '

# make background window look like white tab
set-window-option -g window-status-style bg=default,fg=white,none
set-window-option -g window-status-format '#[fg=colour214,bg=colour235] #I #[fg=white,bg=colour236] #W #[default]'

# make foreground window look like bold yellow foreground tab
set-window-option -g window-status-current-style none
set-window-option -g window-status-current-format '#[fg=black,bg=colour214]#I#[fg=black,bg=yellow]#F#[fg=brightwhite,bg=colour238] #W #[default]'

# active terminal yellow border, non-active white
#
# NC: these options aren't defined in `man tmux` for my Tmux on Fedora
# 21, but they work in practice. Instead, I redefine them above using
# the syntax in the man page.
#
#set -g pane-border-bg default
#set -g pane-border-fg colour238
#set -g pane-active-border-bg default
#set -g pane-active-border-fg colour214

# set a 256color $TERM variable so programs inside tmux know they can use 256 colors
# NC: this screws up Emacs. For example, search highlighting blocks
# the matched part of the search!
#set -g default-terminal screen-256color

# reload tmux config file with C-a r
bind r source ~/.tmux.conf

# Create a new window and prompt for name
bind N command-prompt "new-window -n '%%'"

# Rebind prefix to b
bind B set -g prefix ^b
bind A set -g prefix ^a

# Run regular shells, not login shells, by default. This allows the
# env outside tmux to be inherited, and avoids login time path
# manipulations. If scripting tmux, this can be simulted in two steps:
#
# $ tmux -L <socket> new-session -d -s <session> -n <window> $SHELL
# $ tmux -L <socket> set-option -g default-command $SHELL
set-option -g default-command $SHELL

# Initializes TMUX plugin manager.
# Keep this line at the very bottom of tmux.conf.
#
# NC: to install tpm you just clone its Git repo. Use <prefix>-I to
# install plugins defined with '@plugin' keyword above.
run '~/.tmux/plugins/tpm/tpm'