Retrieve a 512 x 512px icon for an iOS app

itunesicon.rb

#!/usr/bin/ruby
# encoding: utf-8
#
# Updated 2017-10-25:
# - Defaults to large size (512)
# - If ImageMagick is installed:
#     - rounds the corners (copped from @bradjasper, https://github.com/bradjasper/Download-iTunes-Icon/blob/master/itunesicon.rb)
#     - replace original with rounded version, converting to png if necessary
# 
# Retrieve an iOS app icon at the highest available resolution
# All arguments are combined to create an iTunes search
# The icon for the first result, if found, is written to a filename
# based on search terms
#
# If ImageMagick is installed (available through Homebrew), rounded
# corners will be added and a transparent PNG will be output.
#
# example:
# $ itunesicon super monsters ate my condo
#
# Use size param ~s/~small/~m/~medium/~l/~large to specify size:
# $ itunesicon super monsters ate my condo ~small 
# 
# http://brettterpstra.com/2013/04/28/instantly-grab-a-high-res-icon-for-any-ios-app/
# http://brettterpstra.com/2013/12/18/icon-grabber-updated-to-search-any-platform/

%w[net/http open-uri cgi fileutils].each do |filename|
  require filename
end

def find_icon(terms, entity, size)
  url = URI.parse("http://itunes.apple.com/search?term=#{CGI.escape(terms)}&entity=#{entity}")
  res = Net::HTTP.get_response(url).body
  match = res.match(/"#{size}":"(.*?)",/)
  unless match.nil?
    return match[1]
  else
    return false
  end
end

terms = ARGV.join(" ")
entity = "iPadSoftware"
type = "_ipad"
if terms =~ /[\#@](ipad|iphone|mac)/i
  if terms =~ /[\#@]iphone/i
    entity = "software"
    type = "_iphone"
  elsif terms =~ /[\#@]mac/i
    entity = "macSoftware"
    type = "_mac"
  end
  terms.gsub!(/[\#@](ipad|iphone|mac)/i, "").gsub!(/\s+/," ")
end

format = "artworkUrl512"
size = "l"
if terms =~ /~(s(mall)?|m(edium)?|l(arge)?)/i
  size = $1[0]
  format = case size
    when /s(mall)?/ then "artworkUrl60"
    when /m(edium)?/ then "artworkUrl100"
    else "artworkUrl512"
  end
  terms.gsub!(/~(s(mall)?|m(edium)?|l(arge)?)/i, "").gsub!(/\s+/," ")
end

def magick(filename, size)
  begin
    i = case size
      when /s/ then 60
      when /m/ then 100
      else 512
    end
    rect = "#{i.to_s}x#{i.to_s}"
    round = (i * 0.15625 + 3).round.to_s
    target = filename.sub(/\.\w+$/,'_round.png')
    %x{convert -size #{rect} xc:none -fill white -draw 'roundRectangle 0,0 #{i},#{i} #{round},#{round}' #{filename} -compose SrcIn -composite #{target} &> /dev/null}
    if File.exists? target
      FileUtils.rm(filename)
      filename.sub!(/\.\w+$/,'.png')
      FileUtils.mv(target,filename)
    end
    return filename
  rescue
    return filename
  end
end


terms.strip!

icon_url = find_icon(terms, entity, format)
unless icon_url
  puts "Error: failed to locate iTunes url. You may need to adjust your search terms."
  exit
end
url = URI.parse(icon_url)
target = File.expand_path("~/Desktop/"+terms.gsub(/[^a-z0-9]+/i,'_')+"_"+size+"."+icon_url.match(/\.(jpg|png)$/)[1])
begin
  open(url) do |f|
    File.open(target,'w+') do |file|
      file.puts f.read
    end
    target = magick(target,size)
    print target
  end
rescue Exception => e
  # puts e.backtrace
  # p e
  puts "Error: failed to save icon."
end

The ImageMagick steps are not working for me anymore. I'm on Big Sur. I've tried reinstalling ImageMagick with Homebrew. Do I need to do something to make it available to this Automator workflow?

The ImageMagick steps are not working for me anymore. I'm on Big Sur. I've tried reinstalling ImageMagick with Homebrew. Do I need to do something to make it available to this Automator workflow?

I noticed I wasn't getting rounded corners anymore, but hadn't had time to look into it. I don't have an answer offhand, but will try to dig in next time I have some free time (new job).