Improve initial plugin save delay

CHANGELOG.md

@@ -4,6 +4,8 @@
 - do not auto-restore tmux environment if another tmux server is already running
   (we don't want to duplicate stuff)
 - bugfixes for 'tmux auto start' OS X Terminal.app and iTerm scripts
+- prevent saving for the first 15 minutes only when plugin is sourced the first
+  time (not on subsequent sources or tmux.conf reloads)
 
 ### v2.1.0, 2015-02-18
 - enable "tmux auto start" for OS X

resurrect_auto.tmux

@@ -16,6 +16,13 @@ handle_tmux_automatic_start() {
 	$CURRENT_DIR/scripts/handle_tmux_automatic_start.sh
 }
 
+delay_saving_environment_on_first_plugin_load() {
+	if [ -z "$(get_tmux_option "$last_auto_save_option" "")" ]; then
+		# last save option not set, this is first time plugin load
+		set_last_save_timestamp
+	fi
+}
+
 add_resurrect_save_interpolation() {
 	local status_right_value="$(get_tmux_option "status-right" "")"
 	local new_value="${save_command_interpolation}${status_right_value}"
@@ -37,9 +44,8 @@ main() {
 	if supported_tmux_version_ok; then
 		handle_tmux_automatic_start
 
-		# Don't start saving right after tmux is started.
-		# We wanna give user a chance to restore previous session.
-		set_last_save_timestamp
+		# give user a chance to restore previously saved session
+		delay_saving_environment_on_first_plugin_load
 		add_resurrect_save_interpolation
 
 		if just_started_tmux_server; then