Improve noscm error message

Author: José Valim

lib/mix/lib/mix/dep.ex

@@ -159,10 +159,11 @@ defmodule Mix.Dep do
   def format_status(%Mix.Dep{status: { :nomatchvsn, vsn }, requirement: req}),
     do: "the dependency does not match the requirement #{inspect req}, got #{inspect vsn}"
 
-  def format_status(%Mix.Dep{status: :noscm, from: from}),
-    do: "the dependency defined in #{Path.relative_to_cwd(from)} did not specify a supported scm, " <>
-        "expected one of :git, :path, :in_umbrella or " <>
-        "the package manager Hex to be installed"
+  def format_status(%Mix.Dep{app: app, status: :noscm, from: from}) do
+    "the dependency #{app} in #{Path.relative_to_cwd(from)} did not specify a supported scm. " <>
+    "Please ensure a package manager (like http://hex.pm/) is available or give one of " <>
+    ":git, :path or :in_umbrella as option"
+  end
 
   def format_status(%Mix.Dep{status: { :lockmismatch, _ }}),
     do: "lock mismatch: the dependency is out of date"

lib/mix/test/mix/tasks/deps_test.exs

@@ -122,16 +122,15 @@ defmodule Mix.Tasks.DepsTest do
     end
   end
 
-  test "raises when no SCM is specified" do
+  test "warns when no SCM is specified" do
     Mix.Project.push NoSCMApp
 
     in_fixture "deps_status", fn ->
       Mix.Tasks.Deps.run []
 
-      msg = "  the dependency defined in mix.exs did not specify a supported scm, " <>
-            "expected one of :git, :path, :in_umbrella " <>
-            "or the package manager Hex to be installed"
-      assert_received { :mix_shell, :info, ["* ok"] }
+      msg = "  the dependency ok in mix.exs did not specify a supported scm. " <>
+            "Please ensure a package manager (like http://hex.pm/) is available or " <>
+            "give one of :git, :path or :in_umbrella as option"
       assert_received { :mix_shell, :info, [^msg] }
     end
   end