Add support for gleam dev_dependencies

Author: Papipo

lib/mix/lib/mix/gleam.ex

@@ -31,7 +31,14 @@ defmodule Mix.Gleam do
       |> Enum.map(&parse_dep!/1)
 
     dev_deps =
-      Map.get(json, "dev-dependencies", %{})
+      case Map.has_key?(json, "dev_dependencies") do
+        true ->
+          Map.get(json, "dev_dependencies", %{})
+
+        # Old format, for compatibility purposes
+        false ->
+          Map.get(json, "dev-dependencies", %{})
+      end
       |> Enum.map(&parse_dep!(&1, only: [:dev, :test]))
 
     with {:ok, name} <- Map.fetch(json, "name"),
@@ -122,7 +129,7 @@ defmodule Mix.Gleam do
 
   defp fetch_gleam_version() do
     case gleam(["--version"]) do
-      {:ok, version} ->
+      {:ok, "gleam " <> version} ->
         case Version.parse(version) do
           {:ok, parsed_version} ->
             {:ok, Version.to_string(parsed_version)}

lib/mix/test/mix/gleam_test.exs

@@ -38,7 +38,7 @@ defmodule Mix.GleamTest do
 
   describe "Gleam export package-information format" do
     test "parse_config" do
-      config =
+      {:ok, config} =
         %{
           "name" => "gael",
           "version" => "1.0.0",
@@ -47,7 +47,7 @@ defmodule Mix.GleamTest do
             "git_dep" => %{"git" => "../git_dep", "ref" => "957b83b"},
             "gleam_stdlib" => %{"version" => ">= 0.18.0 and < 2.0.0"}
           },
-          "dev-dependencies" => %{
+          "dev_dependencies" => %{
             "gleeunit" => %{"version" => ">= 1.0.0 and < 2.0.0"}
           },
           "erlang" => %{
@@ -72,6 +72,32 @@ defmodule Mix.GleamTest do
                ]
              }
     end
+
+    test "with old dev-dependencies format" do
+      {:ok, config} =
+        %{
+          "name" => "gael",
+          "version" => "1.0.0",
+          "gleam" => ">= 1.8.0",
+          "dependencies" => %{
+            "gleam_stdlib" => %{"version" => ">= 0.18.0 and < 2.0.0"}
+          },
+          "dev-dependencies" => %{
+            "gleeunit" => %{"version" => ">= 1.0.0 and < 2.0.0"}
+          }
+        }
+        |> Mix.Gleam.parse_config()
+
+      assert config == %{
+               name: "gael",
+               version: "1.0.0",
+               gleam: ">= 1.8.0",
+               deps: [
+                 {:gleam_stdlib, ">= 0.18.0 and < 2.0.0"},
+                 {:gleeunit, ">= 1.0.0 and < 2.0.0", only: [:dev, :test]}
+               ]
+             }
+    end
   end
 
   describe "integration with Mix" do