move additional classes to new server lib

Emby.Server.Implementations/Library/PathExtensions.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Text.RegularExpressions;
+
+namespace Emby.Server.Implementations.Library
+{
+    public static class PathExtensions
+    {
+        /// <summary>
+        /// Gets the attribute value.
+        /// </summary>
+        /// <param name="str">The STR.</param>
+        /// <param name="attrib">The attrib.</param>
+        /// <returns>System.String.</returns>
+        /// <exception cref="System.ArgumentNullException">attrib</exception>
+        public static string GetAttributeValue(this string str, string attrib)
+        {
+            if (string.IsNullOrEmpty(str))
+            {
+                throw new ArgumentNullException("str");
+            }
+
+            if (string.IsNullOrEmpty(attrib))
+            {
+                throw new ArgumentNullException("attrib");
+            }
+
+            string srch = "[" + attrib + "=";
+            int start = str.IndexOf(srch, StringComparison.OrdinalIgnoreCase);
+            if (start > -1)
+            {
+                start += srch.Length;
+                int end = str.IndexOf(']', start);
+                return str.Substring(start, end - start);
+            }
+            // for imdbid we also accept pattern matching
+            if (string.Equals(attrib, "imdbid", StringComparison.OrdinalIgnoreCase))
+            {
+                var m = Regex.Match(str, "tt\\d{7}", RegexOptions.IgnoreCase);
+                return m.Success ? m.Value : null;
+            }
+
+            return null;
+        }
+    }
+}