Make Tesla an optional dependency (#65)

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project aims to adhere to [Semantic Versioning](https://semver.org/spec
 
 ## [Unreleased]
 
+### Fixed
+
+- Stop failing if Tesla is not in the depencencies
+
 ## [0.4.0] - 2023-04-18
 
 Require Elixir v1.10+.

lib/ex_phone_number/mix/tasks/update_metadata.ex

@@ -1,52 +1,58 @@
-defmodule Mix.Tasks.UpdateMetadata do
-  @moduledoc "Downloads the latest libphonenumber metadata from GitHub"
-  @shortdoc "Update libphonenumber metadata"
-
-  use Mix.Task
-  @raw_files_url "https://raw.githubusercontent.com/google/libphonenumber"
-  @files_to_download ["resources/PhoneNumberMetadata.xml", "resources/PhoneNumberMetadataForTesting.xml"]
-  @resources_directory "resources"
-
-  defmodule GitHub do
-    use Tesla
-
-    plug(Tesla.Middleware.BaseUrl, "https://api.github.com")
-    plug(Tesla.Middleware.Headers, [{"User-Agent", "ex_phone_number"}])
-    plug(Tesla.Middleware.JSON)
-
-    def latest_release(repo) do
-      get("/repos/" <> repo <> "/releases/latest")
+if Code.ensure_loaded?(Tesla) do
+  defmodule Mix.Tasks.UpdateMetadata do
+    @moduledoc "Downloads the latest libphonenumber metadata from GitHub"
+    @shortdoc "Update libphonenumber metadata"
+
+    use Mix.Task
+    @raw_files_url "https://raw.githubusercontent.com/google/libphonenumber"
+    @files_to_download ["resources/PhoneNumberMetadata.xml", "resources/PhoneNumberMetadataForTesting.xml"]
+    @resources_directory "resources"
+
+    defmodule GitHub do
+      def latest_release(repo) do
+        Tesla.get(client(), "/repos/" <> repo <> "/releases/latest")
+      end
+
+      defp client do
+        middleware = [
+          {Tesla.Middleware.BaseUrl, "https://api.github.com"},
+          Tesla.Middleware.JSON,
+          {Tesla.Middleware.Headers, [{"User-Agent", "ex_phone_number"}]}
+        ]
+
+        Tesla.client(middleware)
+      end
     end
-  end
 
-  @impl Mix.Task
-  def run(_args) do
-    latest_tag = fetch_latest_tag()
-    Enum.each(@files_to_download, &download(latest_tag, &1))
-    update_readme(latest_tag)
-  end
+    @impl Mix.Task
+    def run(_args) do
+      latest_tag = fetch_latest_tag()
+      Enum.each(@files_to_download, &download(latest_tag, &1))
+      update_readme(latest_tag)
+    end
 
-  defp fetch_latest_tag() do
-    {:ok, %{body: body}} = GitHub.latest_release("google/libphonenumber")
-    body["tag_name"]
-  end
+    defp fetch_latest_tag() do
+      {:ok, %{body: body}} = GitHub.latest_release("google/libphonenumber")
+      body["tag_name"]
+    end
 
-  defp download(tag, path) do
-    filename = Path.basename(path)
-    local_path = Path.join([File.cwd!(), @resources_directory, filename])
-    file_url = "#{@raw_files_url}/#{tag}/#{path}"
-    {:ok, %{body: body}} = Tesla.get(file_url)
-    File.write!(local_path, body)
-  end
+    defp download(tag, path) do
+      filename = Path.basename(path)
+      local_path = Path.join([File.cwd!(), @resources_directory, filename])
+      file_url = "#{@raw_files_url}/#{tag}/#{path}"
+      {:ok, %{body: body}} = Tesla.get(file_url)
+      File.write!(local_path, body)
+    end
 
-  defp update_readme(tag) do
-    readme_path = Path.join([File.cwd!(), "README.md"])
+    defp update_readme(tag) do
+      readme_path = Path.join([File.cwd!(), "README.md"])
 
-    updated_content =
-      readme_path
-      |> File.read!()
-      |> String.replace(~r{Current metadata version: v[\d+].[\d+].[\d+]\.}, "Current metadata version: " <> tag <> ".")
+      updated_content =
+        readme_path
+        |> File.read!()
+        |> String.replace(~r{Current metadata version: v[\d+].[\d+].[\d+]\.}, "Current metadata version: " <> tag <> ".")
 
-    File.write!(readme_path, updated_content)
+      File.write!(readme_path, updated_content)
+    end
   end
 end

mix.exs

@@ -28,9 +28,9 @@ defmodule ExPhoneNumber.Mixfile do
       {:sweet_xml, "~> 0.7"},
       {:ex_doc, ">= 0.0.0", only: :dev, runtime: false},
       {:ex_spec, "~> 2.0", only: :test},
-      {:tesla, "~> 1.4", only: [:dev, :test]},
-      {:hackney, "~> 1.17", only: [:dev, :test]},
-      {:jason, ">= 1.0.0", only: [:dev, :test]}
+      {:tesla, "~> 1.4", only: [:dev, :test], optional: true},
+      {:hackney, "~> 1.17", only: [:dev, :test], optional: true},
+      {:jason, ">= 1.0.0", only: [:dev, :test], optional: true}
     ]
   end