First working version

scripts/check_tmux_version.sh

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+#!/usr/bin/env bash
+
+VERSION="$1"
+UNSUPPORTED_MSG="$2"
+
+# this is used to get "clean" integer version number. Examples:
+# `tmux 1.9` => `19`
+# `1.9a`     => `19`
+get_digits_from_string() {
+	local string="$1"
+	local only_digits="$(echo "$string" | tr -dC '[:digit:]')"
+	echo "$only_digits"
+}
+
+tmux_version_int() {
+	local tmux_version_string=$(tmux -V)
+	echo "$(get_digits_from_string "$tmux_version_string")"
+}
+
+exit_if_unsupported_version() {
+	local current_version="$1"
+	local supported_version="$2"
+	if [ "$current_version" -lt "$supported_version" ]; then
+		exit 1
+	fi
+}
+
+main() {
+	local supported_version_int="$(get_digits_from_string "$VERSION")"
+	local current_version_int="$(tmux_version_int)"
+	exit_if_unsupported_version "$current_version_int" "$supported_version_int"
+}
+main

scripts/helpers.sh

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+get_tmux_option() {
+	local option="$1"
+	local default_value="$2"
+	local option_value=$(tmux show-option -gqv "$option")
+	if [ -z "$option_value" ]; then
+		echo "$default_value"
+	else
+		echo "$option_value"
+	fi
+}
+
+set_tmux_option() {
+	local option="$1"
+	local value="$2"
+	tmux set-option -gq "$option" "$value"
+}

scripts/resurrect_auto_save.sh

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+#!/usr/bin/env bash
+
+CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+source "$CURRENT_DIR/helpers.sh"
+source "$CURRENT_DIR/variables.sh"
+
+supported_tmux_version_ok() {
+	$CURRENT_DIR/check_tmux_version.sh "$SUPPORTED_VERSION"
+}
+
+current_timestamp() {
+	echo "$(date +%s)"
+}
+
+set_last_save_timestamp() {
+	set_tmux_option "$last_auto_save_option" "$(current_timestamp)"
+}
+
+enough_time_since_last_run_passed() {
+	local last_saved_timestamp="$(get_tmux_option "$last_auto_save_option" "0")"
+	local interval_minutes="$(get_tmux_option "$auto_save_interval_option" "$auto_save_interval_default")"
+	local interval_seconds="$((interval_minutes * 60))"
+	local next_run="$((last_saved_timestamp + $interval_seconds))"
+	[ "$(current_timestamp)" -ge "$next_run" ]
+}
+
+fetch_and_run_tmux_resurrect_save_script() {
+	local resurrect_save_script_path="$(get_tmux_option "$resurrect_save_path_option" "")"
+	if [ -n "$resurrect_save_script_path" ]; then
+		$resurrect_save_script_path "no-spinner"
+		set_last_save_timestamp
+	fi
+}
+
+main() {
+	if supported_tmux_version_ok && enough_time_since_last_run_passed; then
+		fetch_and_run_tmux_resurrect_save_script
+	fi
+}
+main

scripts/variables.sh

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+SUPPORTED_VERSION="1.9"
+
+# these tmux options contain paths to tmux resurrect save and restore scripts
+resurrect_save_path_option="@resurrect-save-script-path"
+resurrect_restore_path_option="@resurrect-restore-script-path"
+
+auto_save_interval_default="15"
+auto_save_interval_option="@resurrect-auto-save-interval"
+
+# time when the tmux environment was last saved (unix timestamp)
+last_auto_save_option="@resurrect-auto-save-last-timestamp"