Method: Pixelart::Image.convert

Defined in:
lib/pixelart/convert.rb

.convert(dir, from: 'jpg', to: 'png', outdir: nil, overwrite: true) ⇒ Object

helper to convert (all) image in directory

  chech: move to ImageUtils.convert  or such - why? why not?

what about the name e.g. rename to convert_dir or
                                  batch_convert such - why? why not?



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# File 'lib/pixelart/convert.rb', line 11

def self.convert( dir, from: 'jpg',
                       to: 'png',
                       outdir: nil,
                       overwrite: true )

    outdir = dir   if outdir.nil?

    files = Dir.glob( "#{dir}/*.#{from}" )
    puts "==> found #{files.size} image(s) to convert from #{from} to #{to} (overwrite mode set to: #{overwrite})"

    files.each_with_index do |file,i|
      dirname   = File.dirname( file )
      extname   = File.extname( file )
      basename  = File.basename( file, extname )

      ## skip convert if target / dest file already exists

      next  if overwrite == false && File.exist?( "#{outdir}/#{basename}.#{to}" )

      ##  note: make sure outdir exists (magic will not create it??)

      FileUtils.mkdir_p( outdir )  unless Dir.exist?( outdir )

      cmd = "magick convert #{dirname}/#{basename}.#{from} #{outdir}/#{basename}.#{to}"

      puts "   [#{i+1}/#{files.size}] - #{cmd}"
      ## todo/fix:   check return value!!! magick comand not available (in path) and so on!!!

      system( cmd )

      if from == 'gif'
        ## check for multi-images for gif

        ##   save  image-0.png  to  image.png

        path0 = "#{outdir}/#{basename}-0.#{to}"
        path  = "#{outdir}/#{basename}.#{to}"

        ##  note:  image-0.png only exists (gets generated) for multi-images

        if File.exist?( path0 )
          puts "   saving #{path0} to #{path}..."

          blob = File.open( path0, 'rb' ) { |f| f.read }
          File.open( path, 'wb' ) { |f| f.write( blob ) }
        end
      end
    end
end