mkwlppr

#!/bin/sh
#This script creates XML files that can act as dynamic wallpapers for GNOME by referring to multiple wallpapers
#Coded by David J Krajnik

if [ "$*" = "" ]; then
  echo "This script creates XML files that can act as dynamic backgrounds for GNOME by referring to multiple wallpapers"
  echo "Usage: mkwlppr target-file.xml [duration] pic1 pic2 [pic3 .. picN]"
else
  files=$*
  #Grab the name of the target xml file
  xmlfile=$(echo $files | cut -d " " -f 1)
  #remove the first item from $files
  files=$(echo $files | sed 's/^\<[^ ]*\>//')
  if [ "$(echo $xmlfile | grep '\.xml$')" = "" ]; then
    echo "Your target file must be an XML file"
  else
    inputIsValid="true";
    firstItem=$(echo $files | cut -d " " -f 1)
    duration="1795.0";#set the default duration
    if [ "$(echo $firstItem | grep '^[0-9]\+\.[0-9]\+$')" != "" ]; then
      echo "The duration must be an integer"
      files=$(echo $files | sed 's/^\<[^ ]*\>//')
      inputIsValid=""
    elif [ "$(echo $firstItem | grep '^[0-9]\+$')" != "" ]; then
      #If the item is a number, then use it as the duration for each wallpaper image
      duration="$(expr $firstItem - 5).0"
      #remove the duration from the list of files
      files=$(echo $files | sed 's/^\<[^ ]*\>//')
    fi
    if [ "$files" = "" ]; then
      echo "You must enter image files to associate with the XML file"
    else
      for file in $files
      do
        if [ ! -f $file ]; then
          echo "\"$file\" does not exist"
          inputIsValid="";
        elif [ "$(echo $file | sed 's/^.*\.\(jpg\|jpeg\|bmp\|png\|gif\|tif\|tiff\|jif\|jfif\|jp2\|jpx\|j2k\|j2c\)$//')" != "" ]; then
          echo "\"$file\" is not an image file"
          inputIsValid=""
        fi
      done
      if [ $inputIsValid ]; then
        currDir=$(pwd)
        echo "<background>" >> $xmlfile
        echo "  <starttime>\n    <year>2009</year>\n    <month>08</month>\n    <day>04</day>" >> $xmlfile;
        echo "    <hour>00</hour>\n    <minute>00</minute>\n    <second>00</second>\n  </starttime>" >> $xmlfile;
        echo "  <!-- This animation will start at midnight. -->" >> $xmlfile
        firstFile=$(echo $files | cut -d " " -f 1) # grab the first item
        if [ "$(echo $firstFile | sed 's/\(.\).*/\1/')" != "/" ]; then
          #If the first character in the filename is not '/', then it is a relative path and must have the current directory's path appended
          firstFile="$currDir/$firstFile"
        fi
        firstFile=$(echo $firstFile | sed 's/[^/]\+\/\.\.\/\?//g');#Remove occurrences of ".." from the filepath
        files=$(echo $files | sed 's/^\<[^ ]*\>//') # remove the first item
        prevFile=$firstFile
        currFile=""
        #TODO add absolute path to the filenames
        #if $currFile =~ "^/.*" then the file needs to path appended
        echo "  <static>\n    <duration>$duration</duration>\n    <file>$firstFile</file>\n  </static>" >> $xmlfile
        for currFile in $files; do
          if [ "$(echo $currFile | sed 's/\(.\).*/\1/')" != "/" ]; then
            #If the first character in the filename is not '/', then it is a relative path and must have the current directory's path appended
            currFile="$currDir/$currFile"
          fi
          currFile=$(echo $currFile | sed 's/[^/]\+\/\.\.\/\?//g') # Remove occurrences of ".." from the filepath
          echo "  <transition>\n    <duration>5.0</duration>\n    <from>$prevFile</from>\n    <to>$currFile</to>\n  </transition>" >> $xmlfile;
          echo "  <static>\n    <duration>$duration</duration>\n    <file>$currFile</file>\n  </static>" >> $xmlfile;
          prevFile=$currFile
        done
        echo "  <transition>\n    <duration>5.0</duration>\n    <from>$currFile</from>\n    <to>$firstFile</to>\n  </transition>" >> $xmlfile;
        echo "</background>" >> $xmlfile;
      fi
    fi
  fi
fi