rwoeber · January 16, 2016 15:56 · Oct 6, 2015 · Oct 5, 2015 · Oct 5, 2015 · Oct 5, 2015
diff --git a/post-checkout b/post-checkout
@@ -1,3 +1,3 @@
 #!/bin/bash
 # installed to .git/hooks/post-checkout
-`git describe > VERSION`
+`git describe --always --tags > VERSION`
diff --git a/post-commit b/post-commit
@@ -1,3 +1,3 @@
 #!/bin/bash
 # installed to .git/hooks/post-commit
-`git describe > VERSION`
+`git describe --always --tags > VERSION`
diff --git a/mix.exs b/mix.exs
@@ -6,7 +6,7 @@ defmodule MyApp.Mixfile do
      version: get_version,
      elixir: "~> 1.0",
      elixirc_paths: elixirc_paths(Mix.env),
-     compilers: [:phoenix] ++ Mix.compilers,
+     compilers: Mix.compilers,
      build_embedded: Mix.env == :prod,
      start_permanent: Mix.env == :prod,
      deps: deps]
@@ -17,21 +17,38 @@ defmodule MyApp.Mixfile do
   # Type `mix help compile.app` for more information
   def application do
     [mod: {MyApp, []},
-     applications: [:phoenix, :phoenix_html, :cowboy, :logger, :con_cache, :conform]]
+     applications: [:logger]]
   end
 
   defp get_version do
-    System.cmd("git", ["describe", "--always", "--tags"])
-    |> Tuple.to_list 
-    |> List.first 
-    |> String.strip
-    |> String.split(git_version, "-")
+    version_from_file
+    |> handle_file_version
+    |> String.split("-")
     |> case do
       [tag] -> tag
       [tag, _num_commits, commit] -> "#{tag}-#{commit}"
     end
   end
 
+  defp version_from_file(file \\ "VERSION") do
+    File.read(file)
+  end
+
+  defp handle_file_version({:ok, content}) do
+    content
+  end
+  defp handle_file_version({:error, _}) do
+    retrieve_version_from_git
+  end
+  defp retrieve_version_from_git do
+    require Logger
+    Logger.warn "Calling out to `git describe` for the version number. This is slow! You should think about a hook to set the VERSION file"
+    System.cmd("git", ["describe", "--always", "--tags"]) 
+    |> Tuple.to_list 
+    |> List.first 
+    |> String.strip
+  end
+
   # Specifies which paths to compile per environment
   defp elixirc_paths(:test), do: ["lib", "web", "test/support"]
   defp elixirc_paths(_),     do: ["lib", "web"]
@@ -40,13 +57,7 @@ defmodule MyApp.Mixfile do
   #
   # Type `mix help deps` for examples and options
   defp deps do
-    [{:phoenix, "~> 0.13.1"},
-     {:phoenix_html, "~> 1.0"},
-     {:phoenix_live_reload, "~> 0.4", only: :dev},
-     {:cowboy, "~> 1.0"},
-     {:exrm, "~> 0.19.0"},
-     {:conform, "~> 0.16.0"},
-     {:con_cache, "~> 0.8.0"},
+    [
    ]
   end
-end
+end
diff --git a/post-checkout b/post-checkout
@@ -0,0 +1,3 @@
+#!/bin/bash
+# installed to .git/hooks/post-checkout
+`git describe > VERSION`
diff --git a/post-commit b/post-commit
@@ -0,0 +1,3 @@
+#!/bin/bash
+# installed to .git/hooks/post-commit
+`git describe > VERSION`
diff --git a/mix.exs b/mix.exs
@@ -21,8 +21,12 @@ defmodule MyApp.Mixfile do
   end
 
   defp get_version do
-    git_version = System.cmd("git", ["describe", "--always", "--tags"]) |> Tuple.to_list |> List.first |> String.strip
-    case String.split(git_version, "-") do
+    System.cmd("git", ["describe", "--always", "--tags"])
+    |> Tuple.to_list 
+    |> List.first 
+    |> String.strip
+    |> String.split(git_version, "-")
+    |> case do
       [tag] -> tag
       [tag, _num_commits, commit] -> "#{tag}-#{commit}"
     end

diff --git a/mix.exs b/mix.exs
@@ -0,0 +1,48 @@
+defmodule MyApp.Mixfile do
+  use Mix.Project
+
+  def project do
+    [app: :my_app,
+     version: get_version,
+     elixir: "~> 1.0",
+     elixirc_paths: elixirc_paths(Mix.env),
+     compilers: [:phoenix] ++ Mix.compilers,
+     build_embedded: Mix.env == :prod,
+     start_permanent: Mix.env == :prod,
+     deps: deps]
+  end
+
+  # Configuration for the OTP application
+  #
+  # Type `mix help compile.app` for more information
+  def application do
+    [mod: {MyApp, []},
+     applications: [:phoenix, :phoenix_html, :cowboy, :logger, :con_cache, :conform]]
+  end
+
+  defp get_version do
+    git_version = System.cmd("git", ["describe", "--always", "--tags"]) |> Tuple.to_list |> List.first |> String.strip
+    case String.split(git_version, "-") do
+      [tag] -> tag
+      [tag, _num_commits, commit] -> "#{tag}-#{commit}"
+    end
+  end
+
+  # Specifies which paths to compile per environment
+  defp elixirc_paths(:test), do: ["lib", "web", "test/support"]
+  defp elixirc_paths(_),     do: ["lib", "web"]
+
+  # Specifies your project dependencies
+  #
+  # Type `mix help deps` for examples and options
+  defp deps do
+    [{:phoenix, "~> 0.13.1"},
+     {:phoenix_html, "~> 1.0"},
+     {:phoenix_live_reload, "~> 0.4", only: :dev},
+     {:cowboy, "~> 1.0"},
+     {:exrm, "~> 0.19.0"},
+     {:conform, "~> 0.16.0"},
+     {:con_cache, "~> 0.8.0"},
+   ]
+  end
+end
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