Duel Links DeckListGen

compile.rb

#!/usr/bin/env ruby
# == Duel Links DeckListGen ==
# by Conor S. O'Brien
# 
# == Licensing ==
# Please note this code is licensed under CC BY-SA 4.0 (see the gist for the
# full text). This program is a tool, and thus the resulting images are not
# licensed. Do not claim the results of this program as your own work, and
# if you use these images in a stream, video, image compilation, etc., please
# credit me in the relevant content description with the expanded title of
# this program[1], optionally including a link to the gist[2].
#
#  [1]: Duel Links DeckListGen by Conor S. O'Brien
#  [2]: Duel Links DeckListGen by Conor S. O'Brien https://bit.ly/2TXQfpW
# 
# License Summary (from CC):
# 
# You are free to:
# 
#     Share — copy and redistribute the material in any medium or format
#     Adapt — remix, transform, and build upon the material
#     for any purpose, even commercially.
# 
# The licensor cannot revoke these freedoms as long as you follow the license
# terms.
#
# == Usage ==
USAGE = <<~EOT
    Usage: compile.rb source output [width] [fill]
        source      path to the folder containing the images
        output      path to the folder to output the final image
        width       number of images in each row (default: 6)
        fill        path to fill image (default: bg.png)
    The program will select all .PNG images in the folder. It expects them to
    be named like "I-R.png". I represents the index of the image in the deck
    list and R represents how many copies of that card are in the deck. All
    images should be square and will be scaled down to match the smallest image
    given.
EOT
# 

require "chunky_png"

def pluralize(item, count, pattern: "%s %s%s", suffix: "s")
    suffix = "" if count == 1
    sprintf pattern, count, item, suffix
end

class CardImage
    def initialize(path)
        @image = ChunkyPNG::Image.from_file path
        @name = File.basename path, ".*"
        @index, @count = @name.split("-").map &:to_i
        @width = @image.width
        if @image.height != @image.width
            dimensions = "#{@image.width}x#{@image.height}"
            raise "Expected square image, got #{dimensions}"
        end
    end
    
    attr_reader :index, :name, :image, :count, :width
    
    def inspect
        "CardImage(#@name)"
    end
end

class CanvasMaker
    def initialize(paths, width, fill: nil, verbose: false)
        @verbose = verbose
        notify "Initializing pictures."
        @fill = fill
        if @fill.nil?
            notify "No fill image given, loading default background image."
            @fill = ChunkyPNG::Image.from_file "bg.png"
            notify "Loaded."
        end
        @width = width
        notify "Loading given images."
        @pictures = paths.map.with_index(1) { |path, i|
            notify "(#{i}/#{paths.size}) #{path}"
            CardImage.new path
        }
        @pictures.sort_by! &:index
        @deck_size = @pictures.sum &:count
        @height = (@deck_size.to_f / width).ceil
        @unit_width = @pictures.map(&:width).min
        @row = @column = 0
        @output = nil
        notify "Instance initialized with #{pluralize "picture", @pictures.size}:"
        notify "  width = #@width"
        notify "  unit_width = #@unit_width"
    end
    
    attr_reader :width, :pictures, :deck_size, :height, :unit_width, :output
    
    def increment_position
        @column += 1
        if @column == @width
            @column = 0
            @row += 1
        end
    end
    
    def append(image)
        if image.width != @unit_width
            image.resample_bilinear! unit_width, unit_width
        end
        @output.replace! image, @column * @unit_width, @row * @unit_width
        increment_position
    end
    
    def compose(outpath)
        notify "Composing picture."
        @output = ChunkyPNG::Image.new(
            @unit_width * @width,
            @unit_width * @height,
            ChunkyPNG::Color::TRANSPARENT
        )
        notify "Composing result..."
        @pictures.each { |pic|
            notify "  handling #{pic.inspect}..."
            pic.count.times { |i|
                notify "    (#{i + 1}/#{pic.count})"
                append pic.image
            }
        }
        notify "Result composed."
        
        fill_amount = @column.zero? ? 0 : @width - @column
        
        notify "Filling final #{fill_amount} cells..."
        if fill_amount.zero?
            notify "No cells to fill."
        else
            fill_amount.times { |i|
                notify "(#{i + 1}/#{fill_amount})"
                append @fill
            }
        end
        
        notify "Saving picture to #{outpath}"
        @output.save outpath
    end
    
    def notify(message)
        puts message if @verbose
    end
end

if ARGV.size < 2
    STDERR.puts "Expected 2 arguments, got #{ARGV.size}."
    STDERR.puts USAGE
    exit 1
end

folder_name = ARGV[0]
outfolder = ARGV[1]

unless File.directory? folder_name
    STDERR.puts "(source) #{folder_name} does not exist."
    STDERR.puts USAGE
    exit 2
end

unless File.directory? outfolder
    STDERR.puts "(output) #{outfolder} does not exist."
    STDERR.puts USAGE
    exit 2
end

width = ARGV[2]&.to_i || 6

if width <= 0
    STDERR.puts "(width) Expected width to be at least 1, got #{width}."
end

fill = ARGV[3] && CardImage.new(ARGV[3])

pictures = Dir[File.join folder_name, "*.png"]

begin
    maker = CanvasMaker.new(pictures, width, fill: fill, verbose: true)
    maker.compose "#{outfolder}/#{folder_name}.png"
rescue Exception => e
    STDERR.puts e
end

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