Fix inspect exception with ANSI enabled (#148)

Author: pnezis

lib/nimble_options/validation_error.ex

@@ -51,11 +51,10 @@ defmodule NimbleOptions.ValidationError do
         |> Map.drop([:__struct__, :__exception__])
         |> Map.update!(:value, &if(redacted?, do: "**redacted**", else: &1))
         |> Enum.sort_by(fn {key, _val} -> key end)
-        |> Enum.map(fn {key, val} -> [string("#{key}:"), break(), to_doc(val, opts)] end)
-        |> Enum.intersperse([string(","), break()])
-        |> List.flatten()
+        |> Enum.map(fn {key, val} -> concat([string("#{key}: "), to_doc(val, opts)]) end)
+        |> Enum.intersperse(string(", "))
 
-      concat(["##{inspect(@for)}<"] ++ fields ++ [">"])
+      concat(["##{inspect(@for)}<", concat(fields), ">"])
     end
   end
 end

test/nimble_options/validation_error_test.exs

@@ -45,6 +45,16 @@ defmodule NimbleOptions.ValidationErrorTest do
                ~s(#NimbleOptions.ValidationError<key: :foo, keys_path: [], message: "invalid value for :foo option: expected integer, got: true", redact: false, value: true>)
     end
 
+    test "with syntax colors" do
+      schema = [foo: [type: :integer]]
+      opts = [foo: true]
+
+      {:error, error} = NimbleOptions.validate(opts, schema)
+
+      assert inspect(error, syntax_colors: [atom: :red]) ==
+               ~s(#NimbleOptions.ValidationError<key: \e[31m:foo\e[0m, keys_path: [], message: "invalid value for :foo option: expected integer, got: true", redact: false, value: true>)
+    end
+
     test "with a redacted option" do
       schema = [foo: [type: :integer, redact: true]]