better newline support

lib/labelmaker_web/tools.ex

@@ -12,6 +12,14 @@ defmodule LabelmakerWeb.Tools do
       Constants.defaults()
       |> Map.new(fn {k, v} -> {Atom.to_string(k), v} end)
       |> Map.merge(parameters)
+      |> Enum.map(fn
+        {"label", label} ->
+          {"label", process_label(label)}
+
+        pair ->
+          pair
+      end)
+      |> Map.new()
 
     parameters =
       Constants.defaults()
@@ -29,9 +37,6 @@ defmodule LabelmakerWeb.Tools do
         {:height, height} ->
           {:height, process_height(height, parameters)}
 
-        {:label, label} ->
-          {:label, process_label(label)}
-
         {:label_too_long, _} ->
           {:label_too_long, String.length(parameters["label"]) > Constants.max_label_length()}
 
@@ -39,7 +44,10 @@ defmodule LabelmakerWeb.Tools do
           {:preview_height, calculate_preview_height(parameters)}
 
         {:preview_text, _} ->
-          {:preview_text, String.split(parameters["label"], "\\n")}
+          {:preview_text, generate_preview_text(parameters["label"])}
+
+        {:rows, _} ->
+          {:rows, process_rows(parameters["label"])}
 
         {:width, width} ->
           {:width, process_width(width, parameters)}
@@ -78,11 +86,9 @@ defmodule LabelmakerWeb.Tools do
   end
 
   defp process_label(label) do
-    if String.length(label) > Constants.max_label_length() do
-      String.slice(label, 0, Constants.max_label_length())
-    else
-      label
-    end
+    label
+    |> String.replace("\\n", "\n")
+    |> String.slice(0, Constants.max_label_length())
   end
 
   defp generate_link(%{height: "", label: label, width: ""} = parameters) do
@@ -93,6 +99,11 @@ defmodule LabelmakerWeb.Tools do
     ~p"/#{label}?#{Map.take(parameters, [:align, :color, :font, :height, :outline, :width])}"
   end
 
+  defp generate_preview_text(label) do
+    label
+    |> String.replace("\n", "<br />")
+  end
+
   def process_preview_background(bg) do
     case bg do
       "r" -> "bg-[linear-gradient(to_right,_black_33%,_white_67%)]"
@@ -114,9 +125,19 @@ defmodule LabelmakerWeb.Tools do
 
   defp calculate_preview_height(parameters) do
     size = parameters["size"] |> String.to_integer()
-    line_breaks = Regex.scan(~r/#{Regex.escape("\\n")}/, parameters["label"]) |> length()
+    rows = calculate_rows(parameters["label"])
 
-    size + size * line_breaks
+    size + size * rows
+  end
+
+  defp calculate_rows(label) do
+    Regex.scan(~r/#{Regex.escape("\n")}/, label) |> length()
+  end
+
+  defp process_rows(label) do
+    calculate_rows(label)
+    |> max(Constants.rows_min())
+    |> min(Constants.rows_max())
   end
 
   def outline(_, error: true), do: outline(Constants.danger(), false)