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#!/bin/bash
#
# By Victor Orlikowski. Public domain.
#
# This script maintains snapshots of each pane's
# history buffer, for each tmux session you are running.
#
# It is intended to be run by cron, on whatever interval works
# for you.
# Maximum number of snapshots to keep.
max_backups=12
# Names of sessions you may wish to exclude from snapshotting,
# space separated.
ignore_sessions=""
# The directory into which you want your snapshots placed.
# The default is probably "good enough."
backup_dir=~/.tmux_backup/snapshot
########################################################################
# Rotate previous backups.
i=${max_backups}
while [[ ${i} != 0 ]] ; do
if [ -d ${backup_dir}.${i} ] ; then
if [[ ${i} = ${max_backups} ]] ; then
rm -r ${backup_dir}.${i}
else
mv ${backup_dir}.${i} ${backup_dir}.$((${i}+1))
fi
fi
i=$((${i}-1))
done
if [ -d ${backup_dir} ] ; then
mv ${backup_dir} ${backup_dir}.1
fi
## Dump hardcopy from all windows in all available tmux sessions.
unset TMUX
for session in $(tmux list-sessions | cut -d' ' -f1 | sed -e 's/:$//') ; do
for ignore_session in ${ignore_sessions} ; do
if [ ${session} = ${ignore_session} ] ; then
continue 2
fi
done
# Session name can contain the colon character (":").
# This can screw up addressing of windows within tmux, since
# target windows are specified as target-session:target-window.
#
# We use uuidgen to create a "safe" temporary session name,
# which we then use to create a "detached" session that "links"
# to the "real" session that we want to back up.
tmpsession=$(uuidgen)
tmux new-session -d -s "$tmpsession" -t "$session"
HISTSIZE=$(tmux show-options -g -t "$tmpsession" | grep "history-limit" | awk '{print $2}')
for win in $(tmux list-windows -t "$tmpsession" | grep -v "^\s" | cut -d' ' -f1 | sed -e 's/:$//'); do
session_dir=$(echo "$session" | sed -e 's/ /_/g' | sed -e 's%/%|%g')
win_spec="$tmpsession":"$win"
if [ ! -d ${backup_dir}/${session_dir}/${win} ] ; then
mkdir -p ${backup_dir}/${session_dir}/${win}
fi
for pane in $(tmux list-panes -t "$win_spec" | cut -d' ' -f1 | sed -e 's/:$//'); do
pane_path=${backup_dir}/${session_dir}/${win}/${pane}
pane_spec="$win_spec"."$pane"
tmux capture-pane -t "$pane_spec" -S -${HISTSIZE}
tmux save-buffer ${pane_path}
if [ ! -s ${pane_path} ] ; then
sleep 1
rm ${pane_path}
fi
done
done
tmux kill-session -t "$tmpsession"
done
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