Spin a spinner while tmux sessions are restored

Closes #16

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ### master
 - refactor checking if saved tmux session exists
+- spinner while tmux sessions are restored
 
 ### v0.0.5, 2014-08-28
 - restore pane processes

scripts/session_restorer.sh

@@ -4,6 +4,7 @@ CURRENT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
 source "$CURRENT_DIR/helpers.sh"
 source "$CURRENT_DIR/process_restore_helpers.sh"
+source "$CURRENT_DIR/spinner_helpers.sh"
 
 is_line_type() {
 	local line_type="$1"
@@ -150,6 +151,7 @@ restore_active_and_alternate_sessions() {
 
 main() {
 	if supported_tmux_version_ok && check_saved_session_exists; then
+		start_spinner
 		restore_all_sessions
 		restore_all_pane_processes
 		restore_pane_layout_for_each_window >/dev/null 2>&1
@@ -157,6 +159,7 @@ main() {
 		restore_active_pane_for_each_window
 		restore_active_and_alternate_windows
 		restore_active_and_alternate_sessions
+		stop_spinner
 		display_message "Restored all Tmux sessions!"
 	fi
 }

scripts/spinner_helpers.sh

@@ -0,0 +1,8 @@
+start_spinner() {
+	$CURRENT_DIR/tmux_spinner.sh "Restoring sessions..." "Restored all Tmux sessions!" &
+	export SPINNER_PID=$!
+}
+
+stop_spinner() {
+	kill $SPINNER_PID
+}

scripts/tmux_spinner.sh

@@ -0,0 +1,29 @@
+#!/usr/bin/env bash
+
+# This script shows tmux spinner with a message. It is intended to be running
+# as a background process which should be `kill`ed at the end.
+#
+# Example usage:
+#
+#   ./tmux_spinner.sh "Working..." "End message!" &
+#   SPINNER_PID=$!
+#   ..
+#   .. execute commands here
+#   ..
+#   kill $SPINNER_PID # Stops spinner and displays 'End message!'
+
+MESSAGE="$1"
+END_MESSAGE="$2"
+SPIN='-\|/'
+
+trap "tmux display-message $END_MESSAGE; exit" SIGINT SIGTERM
+
+main() {
+	local i=0
+	while true; do
+	  i=$(( (i+1) %4 ))
+	  tmux display-message " ${SPIN:$i:1} $MESSAGE"
+	  sleep 0.1
+	done
+}
+main