caption.rb

# -*- encoding : utf-8 -*-

require 'rmagick'

class Caption < Object
    WIDTH = 1440
    HEIGHT = 900
    FONT_SIZE = 20
    MARGIN_LEFT = 30
    MARGIN_BOTTOM = 30


    def make_caption(text, infile, outfile)
        f = File.open infile
        i = Magick::Image.read f
        f.close
        i = i[0]

        i.resize_to_fill! WIDTH, HEIGHT

        d = Magick::Draw.new

        d.font('GillSans.ttc') # put your font near the script
        d.font_size(FONT_SIZE)
        d.fill("black")
        d.text(MARGIN_LEFT+1, HEIGHT-MARGIN_BOTTOM+1, text)
        d.fill("white")
        d.text(MARGIN_LEFT, HEIGHT-MARGIN_BOTTOM, text)
        d.draw i

        i.write outfile
        i.destroy!

    end

    def caption_dir(indir, outdir)
        Dir.foreach(indir) do |filename|
            inpath = indir+"/"+filename

            if inpath.end_with? "jpg", "jpeg"
                text = filename.split(".").first
                text[" - "] = " — " if text.include? " - "
                outpath = [outdir, filename].join "/"
                puts "Making caption for " + filename
                make_caption text, inpath, outpath
            end
        end
    end

end

    
c = Caption.new

c.caption_dir "/Volumes/HDD/Downloads/Media/Pictures/Sotheby`s", "/Volumes/HDD/Downloads/Media/Pictures/Sothebys_captionated_for_Narkomany"