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#!/usr/bin/env ruby
require 'optparse'
require 'mini_magick'
image = nil
left_out = nil
right_out = nil
# Parse and verify command-line arguments.
parser = OptionParser.new do |opts|
opts.on("--input PATH") { |path| image = File.expand_path(path) }
opts.on("--left-out PATH") { |path| left_out = File.expand_path(path) }
opts.on("--right-out PATH") { |path| right_out = File.expand_path(path) }
end
parser.parse!(ARGV)
if not image
$stderr.puts("FATAL: expected an image.")
exit 1
end
if not [left_out, right_out].all?
$stderr.puts("FATAL: expected L and R output images.")
exit 1
end
if not File.file?(image)
$stderr.puts("FATAL: no such file: #{image}")
exit 1
end
# Split the image into two halves.
image_f = MiniMagick::Image.open(image)
w, h = image_f.dimensions
new_w = w/2
$stderr.puts("Input image #{File.basename(image)} has dimensions #{w}x#{h}")
$stderr.puts("Will create two images of size #{new_w}x#{h}")
lefthand_crop = image_f.crop("#{new_w}x#{h}+0+0")
lefthand_crop.write(left_out)
# Need to open the original image twice in order to get back to the
# "starting point."
image_f = MiniMagick::Image.open(image)
righthand_crop = image_f.crop("#{new_w}x#{h}+#{new_w}+0")
righthand_crop.write(right_out)
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