Script intended for use with Hazel to resize/optimize web images based on directives in image filenames. Extended from ttscoff's original.

autooptim.rb

#!/usr/bin/ruby
# From Brett Terpstra <https://gist.github.com/ttscoff/d11fd063d0047bb0d4d235d2279e2085>
# extended by Jonathan Clark 2.4.2018 to allow original to be kept
# extended further, 11.9.2020 to allow borders to be added (currently white and/or black)
# and published at https://gist.github.com/jgclark/2f82e4a27a6157d5608cfc122b26891f
#
# Example:
# > file1@2x%%ohc.png
# => Converts png to jpeg, creates 1x and 2x versions, optimizes both with jpegoptim
#
# Available directives:
#
#   %%[ochdkbw]rXXX[xXXX]
#   o => optimize image
#   c => convert png to jpg
#   h => create a half size image (remove @2x or add _sm)
#   k => keep original
#   rXXX[xXXX] => resize to max-width or WxH
#   b => add black border (default 2 px)
#   w => add white border (default 8 px).
#        If both borders are present, they are added in order they appear.
#        Borders are added after resize and conversion operations.
#
# Requires jpegoptim, pngcrush, and convert (ImageMagick)
require 'fileutils'

ARGV.each do |arg|
  input = File.expand_path(arg)
  Process.exit 1 unless File.exist?(input)
  extension = File.extname(input)
  filename = File.basename(input, extension)
  folder = File.dirname(input)
  keep = false

  next unless filename =~ /%%/

  targets = []
  m = filename.match(/%%([hcor\dxkbw]+)$/)

  next if m.nil?

  directives = m[1]
  filename.sub!(/%%[hcor\dxkbw]+$/, '')

  # Convert png -> jpg
  if directives =~ /c/ && extension =~ /\.png/i
    target = File.join(folder, filename + '.jpg')
    print "Converting #{input} -> #{target}... "
    res = system %(/usr/local/bin/convert "#{input}" -background white -flatten  -alpha off "#{target}" &> /dev/null)
    if res
      puts 'OK'
      FileUtils.mv input, File.expand_path('~/.Trash'), force: true unless keep
      extension = '.jpg'
      input = target
      targets.push(target)
    else
      puts 'ERROR'
      Process.exit 1
    end
  else
    target = File.join(folder, filename + extension)
    FileUtils.cp input, File.expand_path('~/.Trash') unless keep
    FileUtils.mv input, target, force: true
    input = target
    targets.push(target)
  end

  if directives =~ /k/
    keep = true
    puts 'Will keep original'
  end

  # resize to max-width or WxH
  if directives =~ /r(\d+(x(\d+))?)/
    width = Regexp.last_match(1)
    dim = Regexp.last_match(2).nil? ? "#{width}x#{width}" : "#{width}x#{Regexp.last_match(3)}"
    if filename =~ /@2x$/ && directives =~ /h/
      size = (width.to_i / 2).to_s
      puts "#{width} / 2 = #{size}"
    else
      size = width.to_s
      puts "Fullsize = #{size}"
    end
    filename.sub!(/(@2x)?$/, "-#{size}\\1")
    resized = File.join(folder, filename + extension)
    print "Resizing #{input} to #{dim} -> #{resized}... "
    res = system %(/usr/local/bin/convert "#{input}" -adaptive-resize #{dim} "#{resized}" &> /dev/null)
    if res
      puts 'OK'
      unless keep
        FileUtils.mv input, File.expand_path('~/.Trash'), force: true
        targets.delete(input)
      end
      targets.push(resized)
      input = resized
    else
      puts 'ERROR'
      Process.exit 1
    end
  end

  # create a half size image (remove @2x or add _sm)
  if directives =~ /h/
    halfsize = if filename =~ /@2x$/
                 File.join(folder, filename.sub(/@2x$/, '') + extension)
               else
                 File.join(folder, filename + '_sm' + extension)
               end
    print "Halving #{input} -> #{halfsize}... "
    puts %(/usr/local/bin/convert "#{input}" -adaptive-resize 50% "#{halfsize}" &> /dev/null)
    res = system %(/usr/local/bin/convert "#{input}" -adaptive-resize 50% "#{halfsize}" &> /dev/null)
    if res
      puts 'OK'
      targets.push(halfsize)
    else
      puts 'ERROR'
      Process.exit 1
    end
  end

  # Add border(s)
  if directives =~ /[wb]/
    temp = File.join(folder, filename + '_temp' + extension)
    if directives =~ /wb/
      puts 'Adding white then black borders ...'
      bordered = File.join(folder, filename + '_borderwb' + extension)
      # it seems these can't both be done as one operation
      res = system %(/usr/local/bin/convert "#{input}" -bordercolor white -border 8 "#{temp}" &> /dev/null)
      unless res
        puts 'ERROR'
        Process.exit 1
      end
      res = system %(/usr/local/bin/convert "#{temp}" -bordercolor black -border 2 "#{bordered}" &> /dev/null)
    elsif directives =~ /bw/
      puts 'Adding black then white borders ...'
      bordered = File.join(folder, filename + '_borderbw' + extension)
      # it seems these can't both be done as one operation
      res = system %(/usr/local/bin/convert "#{input}" -bordercolor black -border 2 "#{temp}" &> /dev/null)
      unless res
        puts 'ERROR'
        Process.exit 1
      end
      res = system %(/usr/local/bin/convert "#{temp}" -bordercolor white -border 8 "#{bordered}" &> /dev/null)
    elsif directives =~ /w/ && directives !~ /b/
      puts 'Adding white border ...'
      bordered = File.join(folder, filename + '_borderw' + extension)
      res = system %(/usr/local/bin/convert "#{input}" -bordercolor white -border 8 "#{bordered}" &> /dev/null)
    elsif directives =~ /b/ && directives !~ /w/
      puts 'Adding black border ...'
      bordered = File.join(folder, filename + '_borderb' + extension)
      res = system %(/usr/local/bin/convert "#{input}" -bordercolor black -border 2 "#{bordered}" &> /dev/null)
    end
    if !res
      puts 'ERROR'
      Process.exit 1
    else
      puts 'OK'
      targets.push(bordered)
      # delete temporary file
      FileUtils.mv temp, File.expand_path('~/.Trash'), force: true

      unless keep
        FileUtils.mv input, File.expand_path('~/.Trash'), force: true
        targets.delete(input)
      end
    end
  end

  # Optimise target
  next unless directives =~ /o/

  targets.each do |target|
    print "Optimizing #{target}... "
    if target =~ /\.jpe?g$/i && File.exist?('/usr/local/bin/jpegoptim')
      res = system %(/usr/local/bin/jpegoptim -fopt --strip-all -m80 -T10 "#{target}" &> /dev/null)
    elsif target =~ /.png$/i && File.exist?('/usr/local/bin/pngcrush')
      res = system %(/usr/local/bin/pngcrush -q -ow "#{target}" &> /dev/null)
    end
    puts res ? 'OK' : 'ERROR'
  end
end