Convert utils

convert-padding-button

#! /usr/bin/ruby
# Usage: convert-padding-button 3 "~/image/logo.png"

`which convert`
unless $? == 0
  puts "Please install imagemagick"
  puts "\t$ brew install imagemagick"
  exit 1
end

type, src = ARGV
scale = type.to_i

req_size = 44
size = `identify -ping -format '%w %h' #{src}`

src_w, src_h = size.split(" ").map(&:to_i)
dst_w = [src_w, req_size * scale].max
dst_h = [src_h, req_size * scale].max

`convert #{src} -background transparent -gravity center -scale #{src_w}x#{src_h} -extent #{dst_w}x#{dst_h} #{src}`