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lib/literature/uploaders/processor.ex
defmodule Literature.Uploaders.Processor do
@moduledoc false
alias Literature.Config
alias Waffle.Transformations.Convert
def process(definition, version, {file, scope}) do
transform = definition.transform(version, {file, scope})
apply_transformation(file, transform)
end
defp apply_transformation(_, :skip), do: [{:ok, nil}]
defp apply_transformation(file, :noaction), do: [{:ok, file}]
defp apply_transformation(file, {cmd, conversion}) do
file
|> generates_image_sizes(conversion)
|> Enum.map(&Convert.apply(cmd, file, &1))
end
defp apply_transformation(file, {cmd, conversion, extension}) do
file
|> generates_image_sizes(conversion)
|> Enum.map(&Convert.apply(cmd, file, &1, extension))
end
# To generate image sizes from 100px until the image width
defp generates_image_sizes(%{path: path}, conversion) do
%{width: width} =
path
|> Mogrify.open()
|> Mogrify.verbose()
Range.new(100, width, Config.waffle_width_step())
|> Enum.map(&"-resize #{&1} #{conversion}")
end
end