don't erase what a user wrote when they go over max_label_length

lib/labelmaker_web/constants.ex

@@ -1,10 +1,10 @@
 defmodule LabelmakerWeb.Constants do
   @defaults %{
-    label: "64 character maximum",
+    label: "",
     font: "Helvetica",
     color: "black",
-    outline: "none",
-    size: "24"
+    outline: "white",
+    size: "32"
   }
 
   @preview %{
@@ -36,6 +36,7 @@ defmodule LabelmakerWeb.Constants do
          |> Enum.map(&String.trim_leading(&1, "  Font: "))
 
   @max_label_length 64
+  @max_label_error "64-character maximum"
 
   @outlines ~w(none white black gray)
 
@@ -50,6 +51,7 @@ defmodule LabelmakerWeb.Constants do
   def fonts, do: @fonts
   def font_count, do: @fonts |> length()
   def max_label_length, do: @max_label_length
+  def max_label_error, do: @max_label_error
   def outlines, do: @outlines
   def permitted_keys, do: @permitted_keys
   def preview, do: @preview

lib/labelmaker_web/live/home.ex

@@ -6,7 +6,6 @@ defmodule LabelmakerWeb.Home do
   def mount(_params, _session, socket) do
     assigns =
       Constants.defaults()
-      |> Map.replace(:label, "")
       |> Map.merge(Constants.preview())
       |> Enum.to_list()
 
@@ -45,10 +44,14 @@ defmodule LabelmakerWeb.Home do
         ]}
         style={"height: calc(2rem + #{@preview_height}px); color: #{@color}; font-family: #{@font}; font-size: #{@size}px; line-height: #{@size}px;"}
       >
+        <%= if String.length(@label) > Constants.max_label_length() do %>
+          {Constants.max_label_error()}
+        <% else %>
           <%= for {str, i} <- Enum.with_index(@preview_text) do %>
             {str}
             {if i < length(@preview_text) - 1, do: raw("<br />")}
           <% end %>
+        <% end %>
       </div>
 
       <form phx-change="update_label" phx-submit="make_label" class="space-y-4">

lib/labelmaker_web/tools.ex

@@ -11,14 +11,23 @@ defmodule LabelmakerWeb.Tools do
       |> Map.take(Constants.permitted_keys())
       |> Map.new(fn {k, v} -> {String.to_atom(k), v} end)
       |> Enum.map(fn
-        {:preview_height, _} -> {:preview_height, size + size * line_breaks}
-        {:preview_text, _} -> {:preview_text, String.split(label, "\\n")}
-        pair -> pair
+        {:label, label} ->
+          if String.length(label) > Constants.max_label_length(),
+            do: {:label, String.slice(label, 0, Constants.max_label_length())},
+            else: {:label, label}
+
+        {:preview_height, _} ->
+          {:preview_height, size + size * line_breaks}
+
+        {:preview_text, _} ->
+          {:preview_text, String.split(label, "\\n")}
+
+        pair ->
+          pair
       end)
       |> Enum.filter(fn
         {:color, color} -> color in Constants.colors()
         {:font, font} -> font in Constants.fonts()
-        {:label, label} -> String.length(label) <= Constants.max_label_length()
         {:outline, outline} -> outline in Constants.outlines()
         {:size, size} -> size in Constants.sizes()
         _ -> true