VintageNet.info: show disabled interfaces too

This is important to know now that power management applies to disabled
interfaces and also since it's good to know when someone explicitly
disables an interface.

This does a minor refactor of how things are printed as well, but the
result is almost identical.

lib/vintage_net/info.ex

@@ -11,39 +11,64 @@ defmodule VintageNet.Info do
         IO.puts("VintageNet hasn't been loaded yet. Try again soon.")
 
       version ->
-        IO.write(["VintageNet ", version, "\n\n"])
+        ifnames = interfaces_to_show()
 
-        do_info(opts)
+        IO.write([format_header(version), format_interfaces(ifnames, opts)])
     end
   end
 
-  defp do_info(opts) do
-    IO.write("""
+  defp format_header(version) do
+    """
+    VintageNet #{version}
+
     All interfaces:       #{inspect(VintageNet.all_interfaces())}
     Available interfaces: #{inspect(VintageNet.get(["available_interfaces"]))}
-    """)
 
-    ifnames = VintageNet.configured_interfaces()
+    """
+  end
+
+  defp format_interfaces([], _opts) do
+    "No interfaces"
+  end
+
+  defp format_interfaces(ifnames, opts) do
+    Enum.map(ifnames, &format_interface(&1, opts))
+  end
+
+  defp interfaces_to_show() do
+    type = VintageNet.match(["interface", :_, "type"])
+
+    for {[_interface, ifname, _type], _value} <- type do
+      ifname
+    end
+  end
 
-    if ifnames == [] do
-      IO.puts("\nNo configured interfaces")
+  defp format_interface(ifname, opts) do
+    if VintageNet.get(["interface", ifname, "present"]) do
+      [
+        "Interface ",
+        ifname,
+        "\n",
+        format_if_attribute(ifname, "type", "Type"),
+        format_if_attribute(ifname, "present", "Present"),
+        format_if_attribute(ifname, "state", "State", true),
+        format_if_attribute(ifname, "connection", "Connection", true),
+        format_addresses(ifname),
+        "  Configuration:\n",
+        format_config(ifname, "    ", opts),
+        "\n"
+      ]
     else
-      ifnames
-      |> Enum.map(fn ifname ->
-        [
-          "\nInterface ",
-          ifname,
-          "\n",
-          format_if_attribute(ifname, "type", "Type"),
-          format_if_attribute(ifname, "present", "Present"),
-          format_if_attribute(ifname, "state", "State", true),
-          format_if_attribute(ifname, "connection", "Connection", true),
-          format_addresses(ifname),
-          "  Configuration:\n",
-          format_config(ifname, "    ", opts)
-        ]
-      end)
-      |> IO.puts()
+      [
+        "Interface ",
+        ifname,
+        "\n",
+        format_if_attribute(ifname, "type", "Type"),
+        "  Present: false\n",
+        "  Configuration:\n",
+        format_config(ifname, "    ", opts),
+        "\n"
+      ]
     end
   end
 

test/vintage_net/info_test.exs

@@ -90,7 +90,7 @@ defmodule VintageNet.InfoTest do
 
     assert output =~ "All interfaces"
     assert output =~ "Available interfaces"
-    assert output =~ "No configured interfaces"
+    assert output =~ "No interfaces"
   end
 
   test "info works with a configured interface" do