thumbnail.zsh

   1 #!/bin/zsh
   2
   3 music=/stuff/music
   4 thumbs="$HOME/.fvwm/.thumbs"
   5
   6 if [ ! -d "$thumbs" ]; then
   7         mkdir "$thumbs" || exit 1
   8 fi
   9
  10 size="x128"
  11 printimg=""
  12 ismusic=""
  13
  14 while [ "${1#--}" != "$1" -a "$1" != "-" ]; do
  15         if [ "$1" = "--small" ]; then
  16                 size="56"
  17         elif [ "$1" = "--size" ]; then
  18                 size="$2"
  19                 shift
  20         elif [ "$1" = "--music" ]; then
  21                 ismusic="yes"
  22         elif [ "$1" = "--image" ]; then
  23                 printimg="yes"
  24         else
  25                 echo "unrecognised option: $1" 1>&2
  26                 exit 1
  27         fi
  28         shift
  29 done
  30 [ "$1" = "-" ] && shift
  31
  32 if ! expr match "$size" '^\([0-9]*\(x[0-9]\+\)\?\)$' >/dev/null 2>&1; then
  33         echo "invalid size specification: $size" 1>&2
  34         exit 1
  35 fi
  36
  37 if [ -z "$1" ]; then
  38         echo "usage: thumbnail.zsh [--small|--size <spec>] [--image] [--music] path" 1>&2
  39         exit 1
  40 fi
  41
  42 if [ -n "$ismusic" ]; then
  43         imgpath="$music/`dirname "${1#$music}"`/cover.jpg"
  44         [ ! -f "$imgpath" ] && imgpath="${imgpath%jpg}png"
  45 else
  46         imgpath="$1"
  47 fi
  48
  49 [ ! -f "$imgpath" ] && exit 0
  50
  51 image="$(readlink -f -- "$imgpath")"
  52 [ ! -f "$image" ] && exit 0
  53
  54 thumb="$thumbs/`echo -n $image | md5sum - | cut -d ' ' -f 1`_$size.png"
  55 if [ -f "$thumb" ]; then
  56         mtime_s="`stat -c %Y -- "$image"`"
  57         mtime_t="`stat -c %Y -- "$thumb"`"
  58         if [ "$mtime_s" -gt "$mtime_t" ]; then
  59                 convert -scale "$size" "$image" "$thumb"
  60         fi
  61 else
  62         convert -scale "$size" "$image" "$thumb"
  63 fi
  64
  65 echo "$thumb"
  66 [ -n "$printimg" ] && echo "$image"
  67 exit 0