bash-scripts/bgchange at master · Kylerchrdsn/bash-scripts · GitHub

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#! /bin/bash

## Options Parsing ##
function parseOptions(){
  invalidOptionFlag=0 # set invalid option boolean
  options=($@)        # put the options into an array

  while [ ${#options[@]} -gt 0 ]; do    # while there are options to parse
    case ${options} in                  # Examin the current option
      (--*)                             # If it is a long option
        case ${options} in              # Parse the long option
          (--flag-path)
            options=(${options[@]#${options}})

            if [ "${options:0:1}" == "-" ]; then
              continue
            else
              flag_path="${options}"
              options=(${options[@]#${options}})
              continue
            fi
            ;;
          (*)
            echo "invalid option ${options}"
            invalidOptionFlag=1
            ;;
        esac
        ;;
      (-*)                             # If it is a short option
        if [ ${#options} -lt 3 ]; then # If it is a single short option
          case ${options} in
            (-c)
              cinnamon=1
              ;;
            (*)
              echo "invalid option ${options}"
              invalidOptionFlag=1
              ;;
          esac
        else                           # Create single short options from combined short option
          multiOption="${options}"
          first="-${multiOption:1:1}"
          remaining="-${multiOption:2}"
          options=(${options[@]#${options}} $first $remaining)
          continue
        fi
        ;;
    esac

    options=(${options[@]#${options}}) # Remove the parsed option from options array
  done

  return $invalidOptionFlag
}

## Paths ##
flag_path='/home/krichardson/pictures/desktop_bg/flag'
bgheap_path='/home/krichardson/pictures/bgheap'
bg_path='/home/krichardson/pictures/desktop_bg/1265560742441'

cinnamon=0

## Parse options ##
parseOptions $@


## Variables ##
flag=`cat $flag_path`
bgheap=(`ls $bgheap_path`)
count=`echo ${bgheap[@]} | wc -w`

## Reset flag, if needed ##
if (( $flag == $count )); then echo '0' > $flag_path; flag=0; fi

## For random selection ##
(( selector = ($RANDOM % $count) ))

## Set new background ##
if [ $cinnamon -eq 0  ]; then
  cp $bgheap_path/${bgheap[$selector]} $bg_path
else
  feh --bg-scale $bgheap_path/${bgheap[$selector]}
fi

## Update flag file ##
let flag=$flag+1
echo $flag > $flag_path