/Applications/Gyazo2twitter.app/Contents/Resources/script (contents: http://d.hatena.ne.jp/riocampos+tech/20140630/Gyazo_direct_upload_to_twitter, original: http://blog.kksg.net/posts/gyazo-twitter )

script

#!/usr/bin/env ruby

require 'net/http'
require 'twitter'

client = Twitter::REST::Client.new(
  consumer_key:         "your-consumer-key",
  consumer_secret:      "your-consumer-secret",
  access_token:         "your-access-token",
  access_token_secret:  "your-access-token-secret",
)

# get id
user = IO.popen("whoami", "r+").gets.chomp
program = ARGV[0].to_s
idfile = "/Users/#{user}/Library/Gyazo/id"
old_idfile = File.dirname(program) + "/gyazo.app/Contents/Resources/id"

id = if File.exist?(idfile)
  File.read(idfile).chomp
elsif File.exist?(old_idfile)
  File.read(old_idfile).chomp
end

# capture png file
tmpfile = "/tmp/image_upload#{$$}.png"
imagefile = ARGV[1]
sound_file = File.dirname(program) + "/shutter.aiff"

if imagefile && File.exist?(imagefile)
  system %Q[sips -s format png "#{imagefile}" --out "#{tmpfile}"]
else
  system %Q[screencapture -x -i "#{tmpfile}"]
  if File.exist?(tmpfile)
    system "afplay #{sound_file}"
    system %Q[sips -d profile --deleteColorManagementProperties "#{tmpfile}"] 
    dpiWidth    = `sips -g dpiWidth     "#{tmpfile}" | awk '/:/ {print $2}'`
    dpiHeight   = `sips -g dpiHeight    "#{tmpfile}" | awk '/:/ {print $2}'`
    pixelWidth  = `sips -g pixelWidth   "#{tmpfile}" | awk '/:/ {print $2}'`
    pixelHeight = `sips -g pixelHeight  "#{tmpfile}" | awk '/:/ {print $2}'`
    if (dpiWidth.to_f > 72.0 and dpiHeight.to_f > 72.0)
      width  =  pixelWidth.to_f * 72.0 / dpiWidth.to_f
      height =  pixelHeight.to_f* 72.0 / dpiHeight.to_f
      system %Q[sips -s dpiWidth 72 -s dpiHeight 72 -z #{height} #{width} "#{tmpfile}"]
    end
  end
end

unless File.exist?(tmpfile) 
  exit
end

File.open(tmpfile) { |f|
  res = client.update_with_media('Screenshot by Gyazo #Gyazo', f)
  display_url = res.media.first.display_url
  url = "https://#{display_url}"

  IO.popen("pbcopy","r+"){ |io|
    io.write(url)
  }
  system "open #{url}"
}