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blend

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Test your package against different versions of its dependencies

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blend lib blend templates premix.exs
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lib/blend/templates/premix.exs 

# This file is autogenerated by blend package.

#

# Run `mix blend.gen.premix` to update it's contents after

# each blend package version update.



maybe_put_env = fn varname, value ->

  System.put_env(varname, System.get_env(varname, value))

end



existing_blend = fn name ->

  Code.eval_file("blend.exs")

  |> elem(0)

  |> Map.fetch!(String.to_atom(name))

end



blend = System.get_env("BLEND")



if blend && String.length(blend) > 0 && existing_blend.(blend) do

  maybe_put_env.("MIX_LOCKFILE", "blend/#{blend}.mix.lock")

  maybe_put_env.("MIX_DEPS_PATH", "blend/deps/#{blend}")

  maybe_put_env.("MIX_BUILD_ROOT", "blend/_build/#{blend}")

end