Gav's World : Text Viewer : scripts/magic

1	#!/bin/bash
2	# Define the path and any password options for MPD
3	MY_MPC="/usr/bin/mpc -h 192.168.100.1"
4	# This is the GPIO pin connected to the magic button
5	MagicButton=4
6	# Set the polarity of the switch:
7	# depends if switch is normally open or closed
8	ASSERT=0
9	NEGATE=1
10	echo "$MagicButton" > /sys/class/gpio/export
11	echo "in" > /sys/class/gpio/gpio$MagicButton/direction
12	old=$NEGATE
13	start=0
14	end=0
15	diff=0
16	while [ TRUE ]; do
17	button=$(cat /sys/class/gpio/gpio$MagicButton/value)
18	uptime=$(</proc/uptime)
19	uptime=${uptime%% *}
20	uptime=${uptime/.}
21	#echo "MagicButton: ${button} ${old} ${uptime} ${start} ${end} ${diff}"
22	# Check for button state
23	if [ ${button} -eq $ASSERT ] &;&; [ ${old} -eq $NEGATE ]; then
24	# Button pressed
25	old=$ASSERT
26	start=${uptime}
27	fi
28	if [ ${button} -eq $NEGATE ] &;&; [ ${old} -eq $ASSERT ]; then
29	# Button released
30	old=$NEGATE
31	end=${uptime}
32	diff=`expr ${end} - ${start}`
33	# Now act on the length of button press
34	if [ ${diff} -le 35 ]; then
35	# Skip track
36	echo "MagicButton: Skipping track"
37	$MY_MPC -q next
38	fi
39	if [ ${diff} -gt 35 ] &;&; [ ${diff} -le 200 ]; then
40	# Restart track
41	echo "MagicButton: Restarting track"
42	$MY_MPC -q seek 00:00:00
43	fi
44	if [ ${diff} -ge 500 ]; then
45	# Reboot
46	echo "MagicButton: Rebooting server"
47	reboot
48	fi
49	fi
50	sleep 0.1
51	done