init

Author: goofansu

.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+locale_plug-*.tar
+

README.md

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+# LocalePlug
+
+A plug to set locale for web applications.
+
+## Installation
+
+```elixir
+def deps do
+  [
+    {:locale_plug, "~> 0.1.0"}
+  ]
+end
+```

config/config.exs

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+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+use Mix.Config
+
+# This configuration is loaded before any dependency and is restricted
+# to this project. If another project depends on this project, this
+# file won't be loaded nor affect the parent project. For this reason,
+# if you want to provide default values for your application for
+# third-party users, it should be done in your "mix.exs" file.
+
+# You can configure your application as:
+#
+#     config :locale_plug, key: :value
+#
+# and access this configuration in your application as:
+#
+#     Application.get_env(:locale_plug, :key)
+#
+# You can also configure a third-party app:
+#
+#     config :logger, level: :info
+#
+
+# It is also possible to import configuration files, relative to this
+# directory. For example, you can emulate configuration per environment
+# by uncommenting the line below and defining dev.exs, test.exs and such.
+# Configuration from the imported file will override the ones defined
+# here (which is why it is important to import them last).
+#
+#     import_config "#{Mix.env()}.exs"

lib/locale_plug.ex

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+defmodule LocalePlug do
+  @moduledoc """
+  Fetch locale from params or cookies and set it for the specified Gettext backend.
+
+  ## Example
+
+      plug LocalePlug, backend: MyApp.Gettext
+  """
+
+  import Plug.Conn
+
+  @max_age 365 * 24 * 60 * 60
+
+  def init(opts) do
+    backend = Keyword.fetch!(opts, :backend)
+    [backend: backend]
+  end
+
+  def call(conn, [backend: backend]) do
+    case fetch_locale(conn, backend) do
+      nil ->
+        conn
+      locale ->
+        Gettext.put_locale(backend, locale)
+        put_resp_cookie(conn, "locale", locale, max_age: @max_age)
+    end
+  end
+
+  defp fetch_locale(conn, backend) do
+    (conn.params["locale"] || conn.cookies["locale"])
+    |> check_locale(backend)
+  end
+
+  defp check_locale(locale, backend) do
+    supported_locales = Gettext.known_locales(backend)
+    if locale in supported_locales do
+      locale
+    else
+      nil
+    end
+  end
+end

mix.exs

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+defmodule LocalePlug.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :locale_plug,
+      version: "0.1.0",
+      elixir: "~> 1.8",
+      start_permanent: Mix.env() == :prod,
+      deps: deps(),
+
+      # Publish package
+      name: "LocalePlug",
+      description: description(),
+      package: package()
+    ]
+  end
+
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  defp deps do
+    [
+      {:plug, "~> 1.7"},
+      {:gettext, ">= 0.0.0"},
+      {:ex_doc, "~> 0.19", only: :dev, runtime: false}
+    ]
+  end
+
+  defp description do
+    "A plug to set locale for web applications."
+  end
+
+  defp package do
+    [
+      name: :locale_plug,
+      licenses: ["MIT"],
+      maintainers: ["goofansu"],
+      links: %{"Github" => "https://github.com/goofansu/locale_plug"}
+    ]
+  end
+end

mix.lock

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+%{
+  "earmark": {:hex, :earmark, "1.3.2", "b840562ea3d67795ffbb5bd88940b1bed0ed9fa32834915125ea7d02e35888a5", [:mix], [], "hexpm"},
+  "ex_doc": {:hex, :ex_doc, "0.20.1", "88eaa16e67c505664fd6a66f42ddb962d424ad68df586b214b71443c69887123", [:mix], [{:earmark, "~> 1.3", [hex: :earmark, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.10", [hex: :makeup_elixir, repo: "hexpm", optional: false]}], "hexpm"},
+  "gettext": {:hex, :gettext, "0.16.1", "e2130b25eebcbe02bb343b119a07ae2c7e28bd4b146c4a154da2ffb2b3507af2", [:mix], [], "hexpm"},
+  "makeup": {:hex, :makeup, "0.8.0", "9cf32aea71c7fe0a4b2e9246c2c4978f9070257e5c9ce6d4a28ec450a839b55f", [:mix], [{:nimble_parsec, "~> 0.5.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm"},
+  "makeup_elixir": {:hex, :makeup_elixir, "0.13.0", "be7a477997dcac2e48a9d695ec730b2d22418292675c75aa2d34ba0909dcdeda", [:mix], [{:makeup, "~> 0.8", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm"},
+  "mime": {:hex, :mime, "1.3.1", "30ce04ab3175b6ad0bdce0035cba77bba68b813d523d1aac73d9781b4d193cf8", [:mix], [], "hexpm"},
+  "nimble_parsec": {:hex, :nimble_parsec, "0.5.0", "90e2eca3d0266e5c53f8fbe0079694740b9c91b6747f2b7e3c5d21966bba8300", [:mix], [], "hexpm"},
+  "plug": {:hex, :plug, "1.8.0", "9d2685cb007fe5e28ed9ac27af2815bc262b7817a00929ac10f56f169f43b977", [:mix], [{:mime, "~> 1.0", [hex: :mime, repo: "hexpm", optional: false]}, {:plug_crypto, "~> 1.0", [hex: :plug_crypto, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4", [hex: :telemetry, repo: "hexpm", optional: true]}], "hexpm"},
+  "plug_crypto": {:hex, :plug_crypto, "1.0.0", "18e49317d3fa343f24620ed22795ec29d4a5e602d52d1513ccea0b07d8ea7d4d", [:mix], [], "hexpm"},
+}

test/locale_plug_test.exs

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+defmodule LocalePlugTest do
+  use ExUnit.Case
+  doctest LocalePlug
+end

test/test_helper.exs

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+ExUnit.start()