Basic Metadata Polish (#3548)

API/Helpers/StringHelper.cs

@@ -0,0 +1,42 @@
+using System.Text.RegularExpressions;
+
+namespace API.Helpers;
+#nullable enable
+
+public static class StringHelper
+{
+    /// <summary>
+    /// Used to squash duplicate break and new lines with a single new line.
+    /// </summary>
+    /// <example>Test br br Test -> Test br Test</example>
+    /// <param name="summary"></param>
+    /// <returns></returns>
+    public static string? SquashBreaklines(string? summary)
+    {
+        if (string.IsNullOrWhiteSpace(summary))
+        {
+            return null;
+        }
+
+        // First standardize all br tags to <br /> format
+        summary = Regex.Replace(summary, @"<br\s*/?>", "<br />", RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
+        // Replace multiple consecutive br tags with a single br tag
+        summary = Regex.Replace(summary, @"(?:<br />\s*)+", "<br /> ", RegexOptions.IgnoreCase | RegexOptions.Compiled);
+
+        // Normalize remaining whitespace (replace multiple spaces with a single space)
+        summary = Regex.Replace(summary, @"\s+", " ").Trim();
+
+        return summary.Trim();
+    }
+
+    /// <summary>
+    /// Removes the (Source: MangaDex) type of tags at the end of descriptions from AL
+    /// </summary>
+    /// <param name="description"></param>
+    /// <returns></returns>
+    public static string? RemoveSourceInDescription(string? description)
+    {
+        return description?.Trim();
+    }
+}