scripts/thumbnail.zsh

   1 #!/usr/bin/env zsh
   2 #
   3 # Copyright © 2008 Nick Bowler
   4 #
   5 # Simple thumbnail generator for use with FVWM.  Thumbnails can be generated at
   6 # any desired size, and are cached for future use.  Prints the cached filename
   7 # to standard output.
   8 #
   9 # License WTFPL2: Do What The Fuck You Want To Public License, version 2.
  10 # This is free software: you are free to do what the fuck you want to.
  11 # There is NO WARRANTY, to the extent permitted by law.
  12
  13 if [[ -z "$MUSIC" ]]; then
  14         MUSIC=/home/music
  15 fi
  16
  17 thumbs="$HOME/.fvwm/.thumbs"
  18
  19 if ! [[ -d "$thumbs" ]]; then
  20         mkdir "$thumbs" || exit 1
  21 fi
  22
  23 size="x128"
  24 printimg=""
  25 ismusic=""
  26
  27 while [[ "${1#--}" != "$1" && "$1" != "-" ]]; do
  28         if   [[ "$1" == "--small" ]]; then
  29                 size="56"
  30         elif [[ "$1" == "--size"  ]]; then
  31                 size="$2"
  32                 shift
  33         elif [[ "$1" = "--music"  ]]; then
  34                 ismusic="yes"
  35         elif [[ "$1" = "--image"  ]]; then
  36                 printimg="yes"
  37         else
  38                 echo "unrecognised option: $1" 1>&2
  39                 exit 1
  40         fi
  41         shift
  42 done
  43 [ "$1" = "-" ] && shift
  44
  45 if ! [[ "$size" =~ '^([0-9]*(x[0-9]+)?)$' ]]; then
  46         echo "invalid size specification: $size" 1>&2
  47         exit 1
  48 fi
  49
  50 if [[ -z "$1" ]]; then
  51         echo "usage: thumbnail.zsh [--small|--size <spec>] [--image] [--music] path" 1>&2
  52         exit 1
  53 fi
  54
  55 if [[ -n "$ismusic" ]]; then
  56         imgpath="$MUSIC/$(dirname "${1#$MUSIC}")/cover.jpg"
  57         [[ ! -f "$imgpath" ]] && imgpath="${imgpath%jpg}png"
  58 else
  59         imgpath="$1"
  60 fi
  61
  62 [[ ! -f "$imgpath" ]] && exit 0
  63
  64 image="$(readlink -f -- "$imgpath")"
  65 [[ ! -f "$image" ]] && exit 0
  66
  67 thumb="$thumbs/$(echo -n $image | md5sum - | cut -d ' ' -f 1)_$size.png"
  68 if [[ -f "$thumb" ]]; then
  69         mtime_s="$(stat -c %Y -- "$image")"
  70         mtime_t="$(stat -c %Y -- "$thumb")"
  71         if [ "$mtime_s" -gt "$mtime_t" ]; then
  72                 convert -scale "$size" "$image" "$thumb"
  73         fi
  74 else
  75         convert -scale "$size" "$image" "$thumb"
  76 fi
  77
  78 echo "$thumb"
  79 [ -n "$printimg" ] && echo "$image"
  80 exit 0