add tmux-config

tmux/tmux-config/.gitattributes

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+# common settings that generally should always be used with your language specific settings
+
+# Auto detect text files and perform LF normalization
+# http://davidlaing.com/2012/09/19/customise-your-gitattributes-to-become-a-git-ninja/
+* text=auto
+
+#
+# The above will handle all files NOT found below
+#
+
+# Documents
+*.doc	 diff=astextplain
+*.DOC	 diff=astextplain
+*.docx diff=astextplain
+*.DOCX diff=astextplain
+*.dot  diff=astextplain
+*.DOT  diff=astextplain
+*.pdf  diff=astextplain
+*.PDF	 diff=astextplain
+*.rtf	 diff=astextplain
+*.RTF	 diff=astextplain
+*.md text
+*.adoc text
+*.textile text
+*.mustache text
+*.csv text
+*.tab text
+*.tsv text
+*.sql text
+
+# Graphics
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.tif binary
+*.tiff binary
+*.ico binary
+# SVG treated as an asset (binary) by default. If you want to treat it as text,
+# comment-out the following line and uncomment the line after.
+*.svg binary
+#*.svg text
+*.eps binary

tmux/tmux-config/.gitignore

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+### https://raw.github.com/github/gitignore/8ab86f6bb71e85b5046f1d921bbbe5ceec9063ba/Global/OSX.gitignore
+
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+

tmux/tmux-config/Dockerfile

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+FROM debian:stretch-slim
+
+RUN apt-get update  \
+  && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    fontconfig \
+    git \
+    gcc \
+    iputils-ping \
+    libevent-dev \
+    libncurses-dev \
+    locales \
+    make \
+    procps \
+    wget \
+  && wget -O - https://github.com/tmux/tmux/releases/download/2.6/tmux-2.6.tar.gz | tar xzf - \
+  && cd tmux-2.6 \
+  && LDFLAGS="-L/usr/local/lib -Wl,-rpath=/usr/local/lib" ./configure --prefix=/usr/local \
+  && make \
+  && make install \
+  && cd .. \
+  && rm -rf tmux-2.6 \
+  && apt-get purge -y gcc make \
+  && apt-get -y autoremove \
+  && apt-get clean \
+  && rm -rf /var/lib/apt/lists/*
+
+RUN sed -i -e 's/# en_US.UTF-8 UTF-8/en_US.UTF-8 UTF-8/' /etc/locale.gen \
+  && locale-gen
+ENV LC_ALL=en_US.UTF-8
+ENV LANG=en_US.UTF-8
+
+RUN mkdir -p $HOME/.fonts $HOME/.config/fontconfig/conf.d \
+  && wget -P $HOME/.fonts https://github.com/powerline/powerline/raw/develop/font/PowerlineSymbols.otf \
+  && wget -P $HOME/.config/fontconfig/conf.d/ https://github.com/powerline/powerline/raw/develop/font/10-powerline-symbols.conf \
+  && fc-cache -vf $HOME/.fonts/
+
+WORKDIR /root
+
+RUN git clone https://github.com/samoshkin/tmux-config \
+  && ./tmux-config/install.sh \
+  && rm -rf ./tmux-config
+
+ENV TERM=xterm-256color
+
+

tmux/tmux-config/install.sh

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+#!/usr/bin/env bash
+
+set -e
+set -u
+set -o pipefail
+
+is_app_installed() {
+  type "$1" &>/dev/null
+}
+
+REPODIR="$(cd "$(dirname "$0")"; pwd -P)"
+cd "$REPODIR";
+
+if ! is_app_installed tmux; then
+  printf "WARNING: \"tmux\" command is not found. \
+Install it first\n"
+  exit 1
+fi
+
+if [ ! -e "$HOME/.tmux/plugins/tpm" ]; then
+  printf "WARNING: Cannot found TPM (Tmux Plugin Manager) \
+ at default location: \$HOME/.tmux/plugins/tpm.\n"
+  git clone https://github.com/tmux-plugins/tpm ~/.tmux/plugins/tpm
+fi
+
+if [ -e "$HOME/.tmux.conf" ]; then
+  printf "Found existing .tmux.conf in your \$HOME directory. Will create a backup at $HOME/.tmux.conf.bak\n"
+fi
+
+cp -f "$HOME/.tmux.conf" "$HOME/.tmux.conf.bak" 2>/dev/null || true
+cp -a ./tmux/. "$HOME"/.tmux/
+ln -sf .tmux/tmux.conf "$HOME"/.tmux.conf;
+
+# Install TPM plugins.
+# TPM requires running tmux server, as soon as `tmux start-server` does not work
+# create dump __noop session in detached mode, and kill it when plugins are installed
+printf "Install TPM plugins\n"
+tmux new -d -s __noop >/dev/null 2>&1 || true 
+tmux set-environment -g TMUX_PLUGIN_MANAGER_PATH "~/.tmux/plugins"
+"$HOME"/.tmux/plugins/tpm/bin/install_plugins || true
+tmux kill-session -t __noop >/dev/null 2>&1 || true
+
+printf "OK: Completed\n"

tmux/tmux-config/readme.md

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+Tmux configuration, that supercharges your [tmux](https://tmux.github.io/) and builds cozy and cool terminal environment.
+
+```
+$ ./tmux-config/install.sh
+```
+

tmux/tmux-config/tmux/renew_env.sh

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+#!/usr/bin/env bash
+
+set -eu
+
+pane_fmt="#{pane_id} #{pane_in_mode} #{pane_input_off} #{pane_dead} #{pane_current_command}"
+tmux list-panes -s -F "$pane_fmt" | awk '
+  $2 == 0 && $3 == 0 && $4 == 0 && $5 ~ /(bash|zsh|ksh|fish)/ { print $1 }
+' | while read -r pane_id; do
+  # renew environment variables according to update-environment tmux option
+  # also clear screen
+  tmux send-keys -t "$pane_id" 'Enter' 'eval "$(tmux show-env -s)"' 'Enter' 'C-l'
+done;

tmux/tmux-config/tmux/tmux.conf

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+# ==========================
+# ===  General settings  ===
+# ==========================
+
+set -g default-terminal "screen-256color"
+set -g history-limit 20000
+set -g buffer-limit 20
+set -sg escape-time 0
+set -g display-time 1500
+set -g remain-on-exit off
+set -g repeat-time 300
+setw -g allow-rename off
+setw -g automatic-rename off
+setw -g aggressive-resize on
+
+# Change prefix key to C-a, easier to type, same to "screen"
+unbind C-b
+set -g prefix C-a
+
+# Set parent terminal title to reflect current window in tmux session 
+set -g set-titles on
+set -g set-titles-string "#I:#W"
+
+# Start index of window/pane with 1, because we're humans, not computers
+set -g base-index 1
+setw -g pane-base-index 1
+
+# Enable mouse support
+set -g mouse on
+
+
+# ==========================
+# ===   Key bindings     ===
+# ==========================
+
+# Unbind default key bindings, we're going to override
+unbind "\$" # rename-session
+unbind ,    # rename-window
+unbind %    # split-window -h
+unbind '"'  # split-window
+unbind }    # swap-pane -D
+unbind {    # swap-pane -U
+unbind [    # paste-buffer
+unbind ]    
+unbind "'"  # select-window
+unbind n    # next-window
+unbind p    # previous-window
+unbind l    # last-window
+unbind M-n  # next window with alert
+unbind M-p  # next window with alert
+unbind o    # focus thru panes
+unbind &    # kill-window
+unbind "#"  # list-buffer 
+unbind =    # choose-buffer
+unbind z    # zoom-pane
+unbind M-Up  # resize 5 rows up
+unbind M-Down # resize 5 rows down
+unbind M-Right # resize 5 rows right
+unbind M-Left # resize 5 rows left
+
+
+# Edit configuration and reload
+bind C-e new-window -n 'tmux.conf' "sh -c '\${EDITOR:-vim} ~/.tmux.conf && tmux source ~/.tmux.conf && tmux display \"Config reloaded\"'"
+
+# Reload tmux configuration 
+bind C-r source-file ~/.tmux.conf \; display "Config reloaded"
+
+# new window and retain cwd
+bind c new-window -c "#{pane_current_path}"
+
+# Prompt to rename window right after it's created
+set-hook -g after-new-window 'command-prompt -I "#{window_name}" "rename-window '%%'"'
+
+# Rename session and window
+bind r command-prompt -I "#{window_name}" "rename-window '%%'"
+bind R command-prompt -I "#{session_name}" "rename-session '%%'"
+
+# Split panes
+bind | split-window -h -c "#{pane_current_path}"
+bind _ split-window -v -c "#{pane_current_path}"
+
+# Select pane and windows
+bind -r C-[ previous-window
+bind -r C-] next-window
+bind -r [ select-pane -t :.-
+bind -r ] select-pane -t :.+
+bind -r Tab last-window   # cycle thru MRU tabs
+bind -r C-o swap-pane -D
+
+# Zoom pane
+bind + resize-pane -Z
+
+# Link window
+bind L command-prompt -p "Link window from (session:window): " "link-window -s %% -a"
+
+# Swap panes back and forth with 1st pane
+# When in main-(horizontal|vertical) layouts, the biggest/widest panel is always @1
+bind \ if '[ #{pane_index} -eq 1 ]' \
+     'swap-pane -s "!"' \
+     'select-pane -t:.1 ; swap-pane -d -t 1 -s "!"'
+
+# Kill pane/window/session shortcuts
+bind x kill-pane
+bind X kill-window
+bind C-x confirm-before -p "kill other windows? (y/n)" "kill-window -a"
+bind Q confirm-before -p "kill-session #S? (y/n)" kill-session
+
+# Merge session with another one (e.g. move all windows)
+# If you use adhoc 1-window sessions, and you want to preserve session upon exit
+# but don't want to create a lot of small unnamed 1-window sessions around
+# move all windows from current session to main named one (dev, work, etc)
+bind C-u command-prompt -p "Session to merge with: " \
+   "run-shell 'yes | head -n #{session_windows} | xargs -I {} -n 1 tmux movew -t %%'"
+
+# Detach from session
+bind d detach
+bind D if -F '#{session_many_attached}' \
+    'confirm-before -p "Detach other clients? (y/n)" "detach -a"' \
+    'display "Session has only 1 client attached"'
+
+# Hide status bar on demand
+bind C-s if -F '#{s/off//:status}' 'set status off' 'set status on'
+
+
+
+# ==================================================
+# === Window monitoring for activity and silence ===
+# ==================================================
+bind m setw monitor-activity \; display-message 'Monitor window activity [#{?monitor-activity,ON,OFF}]'
+bind M if -F '#{monitor-silence}' \
+    'setw monitor-silence 0 ; display-message "Monitor window silence [OFF]"' \
+    'command-prompt -p "Monitor silence: interval (s)" "setw monitor-silence %%"'
+
+# Activity bell and whistles
+set -g visual-activity on
+
+# TODO: Does not work as well, check on newer versions
+# set -g visual-silence on
+
+# BUG: bell-action other ignored · Issue #1027 · tmux/tmux · GitHub - https://github.com/tmux/tmux/issues/1027
+# set -g visual-bell on
+# setw -g bell-action other
+
+# ================================================
+# ===     Copy mode, scroll and clipboard      ===
+# ================================================
+set -g @copy_use_osc52_fallback on
+
+# Prefer vi style key table
+setw -g mode-keys vi
+
+bind p paste-buffer
+bind C-p choose-buffer
+
+# trigger copy mode by
+bind -n M-Up copy-mode
+
+# Scroll up/down by 1 line, half screen, whole screen
+bind -T copy-mode-vi M-Up              send-keys -X scroll-up
+bind -T copy-mode-vi M-Down            send-keys -X scroll-down
+bind -T copy-mode-vi M-PageUp          send-keys -X halfpage-up
+bind -T copy-mode-vi M-PageDown        send-keys -X halfpage-down
+bind -T copy-mode-vi PageDown          send-keys -X page-down
+bind -T copy-mode-vi PageUp            send-keys -X page-up
+
+# When scrolling with mouse wheel, reduce number of scrolled rows per tick to "2" (default is 5)
+bind -T copy-mode-vi WheelUpPane       select-pane \; send-keys -X -N 2 scroll-up
+bind -T copy-mode-vi WheelDownPane     select-pane \; send-keys -X -N 2 scroll-down
+
+# wrap default shell in reattach-to-user-namespace if available
+# there is some hack with `exec & reattach`, credits to "https://github.com/gpakosz/.tmux"
+# don't really understand how it works, but at least window are not renamed to "reattach-to-user-namespace"
+if -b "command -v reattach-to-user-namespace > /dev/null 2>&1" \
+    "run 'tmux set -g default-command \"exec $(tmux show -gv default-shell) 2>/dev/null & reattach-to-user-namespace -l $(tmux show -gv default-shell)\"'"
+
+yank="~/.tmux/yank.sh"
+
+# Copy selected text
+bind -T copy-mode-vi Enter send-keys -X copy-pipe-and-cancel "$yank"
+bind -T copy-mode-vi y send-keys -X copy-pipe-and-cancel "$yank"
+bind -T copy-mode-vi Y send-keys -X copy-line \;\
+    run "tmux save-buffer - | $yank"
+bind-key -T copy-mode-vi D send-keys -X copy-end-of-line \;\
+    run "tmux save-buffer - | $yank"
+bind -T copy-mode-vi C-j send-keys -X copy-pipe-and-cancel "$yank"
+bind-key -T copy-mode-vi A send-keys -X append-selection-and-cancel \;\
+    run "tmux save-buffer - | $yank"
+
+# Copy selection on drag end event, but do not cancel copy mode and do not clear selection
+# clear select on subsequence mouse click
+bind -T copy-mode-vi MouseDragEnd1Pane \
+    send-keys -X copy-pipe "$yank"
+bind -T copy-mode-vi MouseDown1Pane select-pane \;\
+   send-keys -X clear-selection
+    
+# iTerm2 works with clipboard out of the box, set-clipboard already set to "external"
+# tmux show-options -g -s set-clipboard
+# set-clipboard on|external
+
+# =====================================
+# ===           Theme               ===
+# =====================================
+
+# Feel free to NOT use this variables at all (remove, rename)
+# this are named colors, just for convenience
+color_orange="colour166" # 208, 166
+color_purple="colour134" # 135, 134
+color_green="colour076" # 070
+color_blue="colour39"
+color_yellow="colour220"
+color_red="colour160"
+color_black="colour232"
+color_white="white" # 015
+
+# This is a theme CONTRACT, you are required to define variables below
+# Change values, but not remove/rename variables itself
+color_dark="$color_black"
+color_light="$color_white"
+color_session_text="$color_blue"
+color_status_text="colour245"
+color_main="$color_orange"
+color_secondary="$color_purple"
+color_level_ok="$color_green"
+color_level_warn="$color_yellow"
+color_level_stress="$color_red"
+color_window_off_indicator="colour088"
+color_window_off_status_bg="colour238"
+color_window_off_status_current_bg="colour254"
+
+# =====================================
+# ===    Appearence and status bar  ===
+# ======================================
+
+set -g mode-style "fg=default,bg=$color_main"
+
+# command line style
+set -g message-style "fg=$color_main,bg=$color_dark"
+
+# status line style
+set -g status-style "fg=$color_status_text,bg=$color_dark"
+
+# window segments in status line
+set -g window-status-separator ""
+separator_powerline_left=""
+separator_powerline_right=""
+
+# setw -g window-status-style "fg=$color_status_text,bg=$color_dark"
+setw -g window-status-format " #I:#W "
+setw -g window-status-current-style "fg=$color_light,bold,bg=$color_main"
+setw -g window-status-current-format "#[fg=$color_dark,bg=$color_main]$separator_powerline_right#[default] #I:#W# #[fg=$color_main,bg=$color_dark]$separator_powerline_right#[default]"
+
+# when window has monitoring notification
+setw -g window-status-activity-style "fg=$color_main"
+
+# outline for active pane
+setw -g pane-active-border-style "fg=$color_main"
+
+# general status bar settings
+set -g status on
+set -g status-interval 5
+set -g status-position top
+set -g status-justify left
+set -g status-right-length 100
+
+# define widgets we're going to use in status bar
+# note, that this is not the complete list, some of them are loaded from plugins
+wg_session="#[fg=$color_session_text] #S #[default]"
+wg_battery="#{battery_status_fg} #{battery_icon} #{battery_percentage}"
+wg_date="#[fg=$color_secondary]%h %d %H:%M#[default]"
+wg_user_host="#[fg=$color_secondary]#(whoami)#[default]@#H"
+wg_is_zoomed="#[fg=$color_dark,bg=$color_secondary]#{?window_zoomed_flag,[Z],}#[default]"
+# TODO: highlighted for nested local session as well
+wg_is_keys_off="#[fg=$color_light,bg=$color_window_off_indicator]#([ $(tmux show-option -qv key-table) = 'off' ] && echo 'OFF')#[default]"
+
+set -g status-left "$wg_session"
+set -g status-right "#{prefix_highlight} $wg_is_keys_off $wg_is_zoomed #{sysstat_cpu} | #{sysstat_mem} | #{sysstat_loadavg} | $wg_user_host | $wg_date $wg_battery #{online_status}"
+
+# online and offline icon for tmux-online-status
+set -g @online_icon "#[fg=$color_level_ok]●#[default]"
+set -g @offline_icon "#[fg=$color_level_stress]●#[default]"
+
+# Configure view templates for tmux-plugin-sysstat "MEM" and "CPU" widget
+set -g @sysstat_mem_view_tmpl 'MEM:#[fg=#{mem.color}]#{mem.pused}#[default] #{mem.used}'
+
+# Configure colors for tmux-plugin-sysstat "MEM" and "CPU" widget
+set -g @sysstat_cpu_color_low "$color_level_ok"
+set -g @sysstat_cpu_color_medium "$color_level_warn"
+set -g @sysstat_cpu_color_stress "$color_level_stress"
+
+set -g @sysstat_mem_color_low "$color_level_ok"
+set -g @sysstat_mem_color_medium "$color_level_warn"
+set -g @sysstat_mem_color_stress "$color_level_stress"
+
+set -g @sysstat_swap_color_low "$color_level_ok"
+set -g @sysstat_swap_color_medium "$color_level_warn"
+set -g @sysstat_swap_color_stress "$color_level_stress"
+
+
+# Configure tmux-battery widget colors
+set -g @batt_color_full_charge "#[fg=$color_level_ok]"
+set -g @batt_color_high_charge "#[fg=$color_level_ok]"
+set -g @batt_color_medium_charge "#[fg=$color_level_warn]"
+set -g @batt_color_low_charge "#[fg=$color_level_stress]"
+
+# Configure tmux-prefix-highlight colors
+set -g @prefix_highlight_output_prefix '['
+set -g @prefix_highlight_output_suffix ']'
+set -g @prefix_highlight_fg "$color_dark"
+set -g @prefix_highlight_bg "$color_secondary"
+set -g @prefix_highlight_show_copy_mode 'on'
+set -g @prefix_highlight_copy_mode_attr "fg=$color_dark,bg=$color_secondary"
+
+
+# =====================================
+# ===        Renew environment      ===
+# =====================================
+set -g update-environment \
+  "DISPLAY\
+  SSH_ASKPASS\
+  SSH_AUTH_SOCK\
+  SSH_AGENT_PID\
+  SSH_CONNECTION\
+  SSH_TTY\
+  WINDOWID\
+  XAUTHORITY"
+
+bind '$' run "~/.tmux/renew_env.sh"
+
+
+# ============================
+# ===       Plugins        ===
+# ============================
+set -g @plugin 'tmux-plugins/tpm'
+set -g @plugin 'tmux-plugins/tmux-battery'
+set -g @plugin 'tmux-plugins/tmux-prefix-highlight'
+set -g @plugin 'tmux-plugins/tmux-online-status'
+set -g @plugin 'tmux-plugins/tmux-sidebar'
+set -g @plugin 'tmux-plugins/tmux-copycat'
+set -g @plugin 'tmux-plugins/tmux-open'
+set -g @plugin 'samoshkin/tmux-plugin-sysstat'
+
+# Plugin properties
+set -g @sidebar-tree 't'
+set -g @sidebar-tree-focus 'T'
+set -g @sidebar-tree-command 'tree -C'
+
+set -g @open-S 'https://www.google.com/search?q='
+
+
+# ==============================================
+# ===   Nesting local and remote sessions     ===
+# ==============================================
+
+# Session is considered to be remote when we ssh into host
+if-shell 'test -n "$SSH_CLIENT"' \
+    'source-file ~/.tmux/tmux.remote.conf'
+
+# We want to have single prefix key "C-a", usable both for local and remote session
+# we don't want to "C-a" + "a" approach either
+# Idea is to turn off all key bindings and prefix handling on local session,
+# so that all keystrokes are passed to inner/remote session
+
+# see: toggle on/off all keybindings · Issue #237 · tmux/tmux - https://github.com/tmux/tmux/issues/237
+
+# Also, change some visual styles when window keys are off
+bind -T root F12  \
+    set prefix None \;\
+    set key-table off \;\
+    set status-style "fg=$color_status_text,bg=$color_window_off_status_bg" \;\
+    set window-status-current-format "#[fg=$color_window_off_status_bg,bg=$color_window_off_status_current_bg]$separator_powerline_right#[default] #I:#W# #[fg=$color_window_off_status_current_bg,bg=$color_window_off_status_bg]$separator_powerline_right#[default]" \;\
+    set window-status-current-style "fg=$color_dark,bold,bg=$color_window_off_status_current_bg" \;\
+    if -F '#{pane_in_mode}' 'send-keys -X cancel' \;\
+    refresh-client -S \;\
+
+bind -T off F12 \
+  set -u prefix \;\
+  set -u key-table \;\
+  set -u status-style \;\
+  set -u window-status-current-style \;\
+  set -u window-status-current-format \;\
+  refresh-client -S
+
+# Run all plugins' scripts
+run '~/.tmux/plugins/tpm/tpm'

tmux/tmux-config/tmux/tmux.remote.conf

@@ -0,0 +1,10 @@
+# show status bar at bottom for remote session, 
+# so it do not stack together with local session's one
+set -g status-position bottom
+
+# Set port of SSH remote tunnel, where tmux will pipe buffers to transfer on local machine for copy
+set -g @copy_backend_remote_tunnel_port 11988
+
+# In remote mode we don't show "clock" and "battery status" widgets
+set -g status-left "$wg_session"
+set -g status-right "#{prefix_highlight} $wg_is_keys_off $wg_is_zoomed #{sysstat_cpu} | #{sysstat_mem} | #{sysstat_loadavg} | $wg_user_host | #{online_status}"

tmux/tmux-config/tmux/yank.sh

@@ -0,0 +1,68 @@
+#!/usr/bin/env bash
+
+set -eu
+
+is_app_installed() {
+  type "$1" &>/dev/null
+}
+
+# get data either form stdin or from file
+buf=$(cat "$@")
+
+copy_backend_remote_tunnel_port=$(tmux show-option -gvq "@copy_backend_remote_tunnel_port")
+copy_use_osc52_fallback=$(tmux show-option -gvq "@copy_use_osc52_fallback")
+
+# Resolve copy backend: pbcopy (OSX), reattach-to-user-namespace (OSX), xclip/xsel (Linux)
+copy_backend=""
+if is_app_installed pbcopy; then
+  copy_backend="pbcopy"
+elif is_app_installed reattach-to-user-namespace; then
+  copy_backend="reattach-to-user-namespace pbcopy"
+elif [ -n "${DISPLAY-}" ] && is_app_installed xsel; then
+  copy_backend="xsel -i --clipboard"
+elif [ -n "${DISPLAY-}" ] && is_app_installed xclip; then
+  copy_backend="xclip -i -f -selection primary | xclip -i -selection clipboard"
+elif [ -n "${copy_backend_remote_tunnel_port-}" ] \
+    && (netstat -f inet -nl 2>/dev/null || netstat -4 -nl 2>/dev/null) \
+      | grep -q "[.:]$copy_backend_remote_tunnel_port"; then
+  copy_backend="nc localhost $copy_backend_remote_tunnel_port"
+fi
+
+# if copy backend is resolved, copy and exit
+if [ -n "$copy_backend" ]; then
+  printf "%s" "$buf" | eval "$copy_backend"
+  exit;
+fi
+
+
+# If no copy backends were eligible, decide to fallback to OSC 52 escape sequences
+# Note, most terminals do not handle OSC
+if [ "$copy_use_osc52_fallback" == "off" ]; then
+  exit;
+fi
+
+# Copy via OSC 52 ANSI escape sequence to controlling terminal
+buflen=$( printf %s "$buf" | wc -c )
+
+# https://sunaku.github.io/tmux-yank-osc52.html
+# The maximum length of an OSC 52 escape sequence is 100_000 bytes, of which
+# 7 bytes are occupied by a "\033]52;c;" header, 1 byte by a "\a" footer, and
+# 99_992 bytes by the base64-encoded result of 74_994 bytes of copyable text
+maxlen=74994 
+
+# warn if exceeds maxlen
+if [ "$buflen" -gt "$maxlen" ]; then
+  printf "input is %d bytes too long" "$(( buflen - maxlen ))" >&2
+fi
+
+# build up OSC 52 ANSI escape sequence
+esc="\033]52;c;$( printf %s "$buf" | head -c $maxlen | base64 | tr -d '\r\n' )\a"
+esc="\033Ptmux;\033$esc\033\\"
+
+# resolve target terminal to send escape sequence
+# if we are on remote machine, send directly to SSH_TTY to transport escape sequence
+# to terminal on local machine, so data lands in clipboard on our local machine
+pane_active_tty=$(tmux list-panes -F "#{pane_active} #{pane_tty}" | awk '$1=="1" { print $2 }')
+target_tty="${SSH_TTY:-$pane_active_tty}"
+
+printf "$esc" > "$target_tty"