serve images, not HTML

lib/labelmaker_web/constants.ex

@@ -0,0 +1,37 @@
+defmodule LabelmakerWeb.Constants do
+  @defaults %{
+    "label" => "Labelmaker",
+    "font" => "Helvetica",
+    "color" => "black",
+    "size" => "24"
+  }
+
+  @permitted_keys Map.keys(@defaults)
+
+  @colors System.cmd("magick", ["-list", "color"])
+          |> elem(0)
+          |> String.split("\n")
+          # drop header stuff
+          |> Enum.drop(5)
+          |> Enum.map(fn color_info -> color_info |> String.split() |> List.first() end)
+
+  @fonts System.cmd("magick", ["-list", "font"])
+         |> elem(0)
+         |> String.split("\n")
+         |> Enum.filter(&String.starts_with?(&1, "  Font:"))
+         |> Enum.reject(&String.starts_with?(&1, "  Font: ."))
+         |> Enum.map(&String.trim_leading(&1, "  Font: "))
+
+  @sizes 8..72
+         |> Enum.to_list()
+         |> Enum.take_every(4)
+         |> Enum.map(&Integer.to_string/1)
+
+  def defaults, do: @defaults
+  def permitted_keys, do: @permitted_keys
+  def colors, do: @colors
+  def color_count, do: @colors |> length()
+  def fonts, do: @fonts
+  def font_count, do: @fonts |> length()
+  def sizes, do: @sizes
+end