check for new phx.new version

Author: SteffenDE

installer/lib/mix/tasks/phx.new.ex

@@ -150,6 +150,7 @@ defmodule Mix.Tasks.Phx.New do
 
   def run(argv) do
     elixir_version_check!()
+    check_for_new_version()
 
     case OptionParser.parse!(argv, strict: @switches) do
       {_opts, []} ->
@@ -385,4 +386,56 @@ defmodule Mix.Tasks.Phx.New do
       )
     end
   end
+
+  defp check_for_new_version do
+    current_version =
+      Application.spec(:phx_new)[:vsn]
+      |> to_string()
+      |> Version.parse!()
+
+    latest_version = get_latest_version("phx_new")
+
+    if Version.compare(current_version, latest_version) == :lt do
+      Mix.shell().info([
+        :yellow,
+        "A new version of phx.new is available:",
+        :green,
+        " v#{latest_version}",
+        :reset,
+        ".",
+        "\n",
+        "You are currently running ",
+        :red,
+        "v#{current_version}",
+        :reset,
+        ".\n",
+        "To update, run:\n\n",
+        "    $ mix local.phx\n"
+      ])
+    end
+  rescue
+    _ ->
+      # ignore any errors to not prevent the generators from running
+      # due to any issues while checking the version
+      :ok
+  end
+
+  defp get_latest_version(package) do
+    case :hex_repo.get_package(:hex_core.default_config(), package) do
+      {:ok, {200, _headers, package}} ->
+        latest_release =
+          Enum.max_by(
+            package.releases,
+            fn release ->
+              Version.parse!(release.version)
+            end,
+            Version
+          )
+
+        Version.parse!(latest_release.version)
+
+      _ ->
+        nil
+    end
+  end
 end

installer/mix.exs

@@ -58,6 +58,7 @@ defmodule Phx.New.MixProject do
 
   def deps do
     [
+      {:hex_core, "~> 0.11.0"},
       {:ex_doc, "~> 0.24", only: :docs}
     ]
   end

installer/mix.lock

@@ -2,6 +2,7 @@
   "earmark": {:hex, :earmark, "1.4.10", "bddce5e8ea37712a5bfb01541be8ba57d3b171d3fa4f80a0be9bcf1db417bcaf", [:mix], [{:earmark_parser, ">= 1.4.10", [hex: :earmark_parser, repo: "hexpm", optional: false]}], "hexpm", "12dbfa80810478e521d3ffb941ad9fbfcbbd7debe94e1341b4c4a1b2411c1c27"},
   "earmark_parser": {:hex, :earmark_parser, "1.4.39", "424642f8335b05bb9eb611aa1564c148a8ee35c9c8a8bba6e129d51a3e3c6769", [:mix], [], "hexpm", "06553a88d1f1846da9ef066b87b57c6f605552cfbe40d20bd8d59cc6bde41944"},
   "ex_doc": {:hex, :ex_doc, "0.34.0", "ab95e0775db3df71d30cf8d78728dd9261c355c81382bcd4cefdc74610bef13e", [:mix], [{:earmark_parser, "~> 1.4.39", [hex: :earmark_parser, repo: "hexpm", optional: false]}, {:makeup_c, ">= 0.1.0", [hex: :makeup_c, repo: "hexpm", optional: true]}, {:makeup_elixir, "~> 0.14 or ~> 1.0", [hex: :makeup_elixir, repo: "hexpm", optional: false]}, {:makeup_erlang, "~> 0.1 or ~> 1.0", [hex: :makeup_erlang, repo: "hexpm", optional: false]}, {:makeup_html, ">= 0.1.0", [hex: :makeup_html, repo: "hexpm", optional: true]}], "hexpm", "60734fb4c1353f270c3286df4a0d51e65a2c1d9fba66af3940847cc65a8066d7"},
+  "hex_core": {:hex, :hex_core, "0.11.0", "d1c6bbf2a4ee6b5f002bec6fa52b5080c53c8b63b7caf6eb88b943687547bff4", [:rebar3], [], "hexpm", "707893677a425491962a2db522f1d2b1f85f97ea27418b06f7929f1d30cde0b0"},
   "makeup": {:hex, :makeup, "1.1.2", "9ba8837913bdf757787e71c1581c21f9d2455f4dd04cfca785c70bbfff1a76a3", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "cce1566b81fbcbd21eca8ffe808f33b221f9eee2cbc7a1706fc3da9ff18e6cac"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.16.2", "627e84b8e8bf22e60a2579dad15067c755531fea049ae26ef1020cad58fe9578", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "41193978704763f6bbe6cc2758b84909e62984c7752b3784bd3c218bb341706b"},
   "makeup_erlang": {:hex, :makeup_erlang, "1.0.0", "6f0eff9c9c489f26b69b61440bf1b238d95badae49adac77973cbacae87e3c2e", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "ea7a9307de9d1548d2a72d299058d1fd2339e3d398560a0e46c27dab4891e4d2"},