C dwm statusbar app

Question

Hey
I'm trying to configure my dwm setup, and I read the posts on this forum and found out that you have to pipe things to dwm to show things on the statusbar. Trying to find a suitable script I found a C program at http://spaceinvader.rofl.org.uk/. It showed the date, time and load, and some other stuff. I modified it to show the song played by mpd, the date and time, the temperature of the processor and the load. Here's the modified version: http://pastebin.archlinux.org/13104
My problem is the mpd part, nothing mpd-related is showed at all, but I cannot figure out why, so I was wondering if you could help me fix it
Here's the mpd-related part of the program, the problem is most likely in here, and it may well be a stupid error because my C knowledge is limited
//... snip ...//
#define MPC_INFO "/usr/bin/mpc"
//... snip ...//
FILE *dwm, *mpd, *tempP;
//... snip ...//
for (;;) {
getloadavg(&load, 1);
// Run mpc command to get song playing
if ((mpd = popen(MPC_INFO, "r")) == NULL) {
perror("couldn't execute "MPC_INFO);
exit(EXIT_FAILURE);
setvbuf(dwm, NULL, _IOLBF, BUFSIZ);
// Check info read
if (fgets(song_buf, SONG_BUF_SIZE, mpd) == NULL) {
if (ferror(mpd)) {
printf("couldn't read line");
sprintf(song_buf, "error");
clearerr(mpd);
pclose(mpd);
//... snip ...//

Answer 1

I'm far OT here but I'm really impressed to see so many other Archers use the great combo of dwm & mpd!
Here's my .xinitrc. It's ugly but works great. Output:
[ Moby - Bodyrock @ 71% ] [ /:688M ~/:574M c:358M d:616M e:531M ] [ 86% = 1:55 ] [ 800MHz ] [ 27.08.07 - 19:41 ]
#!/bin/sh
# DWM #
space=`echo " "`
timeout=0.2
while true
do
# Battery calc
rem=`cat /proc/acpi/battery/BAT0/state | grep remaining | tr -s " " | cut -d " " -f 3`
voll=`cat /proc/acpi/battery/BAT0/info | grep "design capacity:" | tr -s " " | cut -d " " -f 3`
bat=`echo "100*$rem/$voll" | bc` &> /dev/null
# Battery time
capacity=`cat /proc/acpi/battery/BAT0/state | grep "capacity:" | tr -s " " | cut -d " " -f 3`
rate=`cat /proc/acpi/battery/BAT0/state | grep "rate:" | tr -s " " | cut -d " " -f 3`
thour=`echo "scale=0;$capacity/$rate" | bc` &> /dev/null
tmin=`echo "scale=0;60*$capacity/$rate-60*$thour" | bc` &> /dev/null
if [ `cat /proc/acpi/battery/BAT0/info | grep tech | wc -l` == 0 ];then
batt=""
elif [ `expr $tmin` -le 9 ]; then
tmin="0$tmin"
elfi
elif [ `expr $rate` -gt 0 ];then
batt=`echo "[ ${bat}% = $thour:$tmin ] "`
elfi
fi
# cpufreqd
freq=`cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq`
cpuf=`echo "scale=2;$freq/1000000" | bc`
if [ $freq == 800000 ];then
cpu=`echo " [ 800MHz ] "`
else
cpu=`echo " [ ${cpuf}GHz ] "`
fi
if [ $freq == 1866000 ];then
cpu=""
fi
echo [ `mpc | sed -n '1,1p' | cut -c -70` @ `mpc volume | sed -e 's#volume: ##'` ]${space}[ /:`df -h | grep sda7 | tr -s " " | cut -d " " -f 4` \~/:`df -h | grep home | tr -s " " | cut -d " " -f 4` c:`df -h | grep win/c | tr -s " " | cut -d " " -f 4` d:`df -h | grep win/d | tr -s " " | cut -d " " -f 4` e:`df -h | grep win/e | tr -s " " | cut -d " " -f 4` ]${space}${batt}${cpu}[ `date +%d.%m.%y` - `date +%k:%M` ]
sleep $timeout
done 2> /dev/null | dwm | eval `cat ~/.fehbg`