Maxsolar's Linux Blog: GNOME動態桌布 (Wallpaper Slideshow)

上上禮拜重灌了我的Macbook Pro,也順便重灌了ubuntu 10.10。來澳洲很久沒有動腦筋寫程式了，我想寫寫簡單的shell script或許能提神醒腦一下；剛好email收到台南二寮的一些美麗照片，gnome從2.28以後(好像？？)就可以動態變更桌布啦，只是他會去讀取某一個.xml檔。所以理論上就是準備好圖片，準備好讓gnome讀取的xml就搞定了。

雖然網路上已經有許多同好也寫了一些script或是程式，不過總覺得沒有自己寫來來得爽快。我的這隻程式功能非常簡單，就是只會在當前工作目錄找所有的jpg以及png檔，然後在當前目錄下建立一個xml，這個xml可以放置在任何地方，唯有圖片本身路徑不能任意移動(這好像是廢話@_@)。

#!/bin/bash
#############################################################
# Filename: makeGnomeBackground.sh
# Date: 2011/02/20
# Purpose: changing background dynamically
# Usage:
#
# Description:
# Author: maxsolar(Jim T. Tang@IES, Academia Sinica)
#############################################################
###########################
## pre-defined variables
###########################
# check if there are jpg or png files in current working dir.
find `pwd -P` -maxdepth 1 -name "*jpg" -o -name "*JPG" > filelist.txt 2>/dev/null
find `pwd -P` -maxdepth 1 -name "*png" -o -name "*PNG" >> filelist.txt 2>/dev/null
[ $(cat filelist.txt | wc -l) -eq 0 ] && {
echo "****************************************"
echo "No .jpg nor .png files found. Try other dirs. "
echo "****************************************"
exit 1;
} || {
cat filelist.txt
echo "-------------------------------"
echo "$(cat filelist.txt | wc -l) Pictures were found."
}
year=$(date +"%Y" )
month=$(date +"%m")
day=$(date +"%d")
output=$(basename "`pwd`" /).xml
##main method
read -p "Duration time between pictures? (default=5) " duration1
[ -z $duration1 ] && {
duration1=5
}
read -p "Duration time within a picture? (default=600) " duration2
[ -z $duration2 ] && {
duration2=600
}
## part 1
cat <<HERE > $output
<background>
<starttime>
<year>$year</year>
<month>$month</month>
<day>$day</day>
<hour>00</hour>
<minute>00</minute>
<second>00</second>
</starttime>
HERE
## part 2
declare -a picArray=(`cat filelist.txt`)
declare -i loops=$(cat filelist.txt | wc -l)
for (( i=1; i<="$loops"; i++ )) ; do
##The Last Loop
if [ $i -eq $loops ]; then
cat <<HERE >>$output
<static>
<duration>$duration2</duration>
<file>${picArray[$i-1]}</file>
</static>
<transition>
<duration>$duration1</duration>
<from>${picArray[$i-1]}</from>
<to>${picArray[0]}</to>
</transition>
HERE
else
## in formal loops
cat << HERE >>$output
<static>
<duration>$duration2</duration>
<file>${picArray[$i-1]}</file>
</static>
<transition>
<duration>$duration1</duration>
<from>${picArray[$i-1]}</from>
<to>${picArray[$i]}</to>
</transition>
HERE
fi
done
echo "</background>" >> $output
echo \"$output\" is made.
## remove temparary file
rm filelist.txt