thumbnail.zsh

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