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version_tasks

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A suite of mix tasks for managing your libs version numbers with git and hex

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version_tasks lib mix tasks inc.ex
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lib/mix/tasks/inc.ex 

defmodule Mix.Tasks.Version.Inc do

  use Mix.Task

  use FnExpr

  alias Mix.Tasks.Version



  @shortdoc "Increment to the next version of your project, provide major, minor or patch as input"

  def run(mode) do

    current = Version.Current.calc(mode)

    next = Version.Next.calc(mode)



    IO.puts "Updating mix.exs from #{current} to #{next}"



    update_file("mix.exs", current, next, &update_mix_version/3)

    update_file("README.md", current, next, &update_readme_version/3)

    next

  end





  defp update_file(filename, current, next, update_fn) do



    if File.exists?(filename) do

      IO.puts "  -- Updating #{filename}"

      filename

      |> File.read

      |> invoke(fn ({:ok, content}) -> content end)

      |> String.split("\n")

      |> Enum.map(fn line -> update_fn.(line, current, next) end)

      |> Enum.join("\n")

      |> invoke(fn content -> File.write!(filename, content) end)

    else

      IO.puts "  -- Skipping missing file #{filename}"

    end

  end





  defp update_mix_version(line, current, next) do

    line

    |> String.replace("@version \"#{current}\"", "@version \"#{next}\"")

  end



  defp update_readme_version(line, current, next) do

    line

    |> String.replace("~> #{current}", "~> #{next}")

  end



end