Elixir 20使用mix

参考https://elixir-lang.org/getting-started/mix-otp/introduction-to-mix.html

mix 就是个自动化的工具，包含了创建项目，运行等。 跟rails, rake, bundle差不多。

$ mix new kv --module KV

$ mix new kv --module KV
* creating README.md
* creating .formatter.exs
* creating .gitignore
* creating mix.exs
* creating config
* creating config/config.exs
* creating lib
* creating lib/kv.ex
* creating test
* creating test/test_helper.exs
* creating test/kv_test.exs

Your Mix project was created successfully.
You can use "mix" to compile it, test it, and more:

    cd kv
    mix test

Run "mix help" for more commands.

直接运行测试：

$ cd kv
$ mix test

$ mix test
Compiling 1 file (.ex)
Generated kv app
..

Finished in 0.05 seconds
1 doctest, 1 test, 0 failures

Randomized with seed 685811

同时，可以看到很多文件被生成了。

$ find .
.
./test
./test/test_helper.exs
./test/kv_test.exs
./_build
./_build/test
./_build/test/lib
./_build/test/lib/kv
./_build/test/lib/kv/ebin
./_build/test/lib/kv/ebin/kv.app
./_build/test/lib/kv/ebin/Elixir.KV.beam
./_build/test/lib/kv/consolidated
./_build/test/lib/kv/consolidated/Elixir.IEx.Info.beam
./_build/test/lib/kv/consolidated/Elixir.String.Chars.beam
./_build/test/lib/kv/consolidated/Elixir.Inspect.beam
./_build/test/lib/kv/consolidated/Elixir.List.Chars.beam
./_build/test/lib/kv/consolidated/Elixir.Enumerable.beam
./_build/test/lib/kv/consolidated/Elixir.Collectable.beam
./_build/test/lib/kv/.mix
./_build/test/lib/kv/.mix/compile.elixir
./_build/test/lib/kv/.mix/compile.elixir_scm
./_build/test/lib/kv/.mix/compile.xref
./_build/test/lib/kv/.mix/.mix_test_failures
./_build/test/lib/kv/.mix/compile.protocols
./.formatter.exs
./.gitignore
./mix.exs
./README.md
./config
./config/config.exs
./lib
./lib/kv.ex

可以看到，根目录下，生成了一个文件：mix.exs

defmodule KV.MixProject do
  use Mix.Project

  def project do
    [   
      app: :kv,
      version: "0.1.0",
      elixir: "~> 1.8",
      start_permanent: Mix.env() == :prod,
      deps: deps()
    ]   
  end 

  # Run "mix help compile.app" to learn about applications.
  def application do
    [   
      extra_applications: [:logger]
    ]   
  end 

  # Run "mix help deps" to learn about dependencies.
  defp deps do
    [   
      # {:dep_from_hexpm, "~> 0.3.0"},
      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
    ]   
  end 
end

lib 目录下，生成了一个 kv.ex 文件

defmodule KV do
  def hello do
    :world
  end
end

test 目录下，是相关的文件。 

test/test_helper.exs    中，只有一行内容：ExUnit.start()   这个是废代码，先留着。 

test/kv_test.exs  该文件是单元测试文件。 内容如下：

defmodule KVTest do
  use ExUnit.Case
  doctest KV

  test "greets the world" do   
    assert KV.hello() == :world
  end
end

编译

$ mix compile
Compiling 1 file (.ex)
Generated kv app

$ MIX_ENV=prod mix compile
Compiling 1 file (.ex)
Generated kv app