#!/bin/bash
# thumbnails -- create thumbnail images for the graphics file specified, 
#    matching exact dimensions or not-to-exceed dimensions#

setvar convargs = ""-unsharp 0x.5 -resize""
setvar count = '0'; setvar exact = """"; setvar fit = """"

proc usage {
  echo "Usage: $(basename $0) (-e|-f) thumbnail-size image [image] [image]" >&2
  echo "-e  resize to exact dimensions, ignoring original proportions" >&2
  echo "-f  fit image into specified dimensions, retaiing proportion" >&2 
  echo "-s  strip EXIF information (make ready for Web use)" >&2
  echo "    please use WIDTHxHEIGHT for requested size (e.g., 100x100)"
  exit 1
}

#############
## BEGIN MAIN

if test $Argc -eq 0  {
  usage
}

while getopts "e:f:s" opt {
  case (opt) {
   e  { setvar exact = "$OPTARG";                }
   f  { setvar fit = "$OPTARG";                  }
   s  { setvar strip = ""-strip"";		       }
   ?  { usage;			       }
  }
}
shift $(($OPTIND - 1))  # eat all the parsed arguments

 setvar rwidth = "$(echo $exact $fit | cut -dx -f1)"	# requested width
setvar rheight = "$(echo $exact $fit | cut -dx -f2)"for image in @ARGV {
  setvar width = "$(identify -format "%w" "$image")"
  setvar height = "$(identify -format "%h" "$image")"

  # Building thumbnail for image $image, width=$width and height=$height
  if test $width -le $rwidth -a $height -le $rheight  {
    echo "Image $image is already smaller than reqeusted dimensions. Skipped."
  } else {
    # build new filename 

    setvar suffix = "$(echo $image | rev | cut -d. -f1 | rev)"
    setvar prefix = "$(echo $image | rev | cut -d. -f2- | rev)"
    setvar newname = ""$prefix-thumb.$suffix""
   
    # add the "!" suffix to ignore proportions as needed

    if test -z $fit  {
      setvar size = ""$exact!""
      echo "Creating ${rwidth}x${rheight} (exact size) thumbnail for file $image"
    } else {
      setvar size = "$fit"
      echo "Creating ${rwidth}x${rheight} (max dimensions) thumbnail for file $image"
    }

    convert $image $strip $convargs $size $newname
  }
  setvar count = $(( $count + 1 ))
}

if test $count -eq 0  {
  echo "Warning: no images found to process."
}

exit 0