Add generated Emoji class with corresponding non-generated file

src/Spectre.Console/Emoji.cs

@@ -0,0 +1,23 @@
+using System.Text.RegularExpressions;
+
+namespace Spectre.Console
+{
+    /// <summary>
+    /// Utility class for working with emojis.
+    /// </summary>
+    internal static partial class Emoji
+    {
+        private static readonly Regex _emojiCode = new Regex(@"(:(\S*?):)", RegexOptions.Compiled);
+
+        /// <summary>
+        /// Replaces emoji markup with corresponding unicode characters.
+        /// </summary>
+        /// <param name="value">A string with emojis codes, e.g. "Hello :smiley:!".</param>
+        /// <returns>A string with emoji codes replaced with actual emoji.</returns>
+        public static string Replace(string value)
+        {
+            static string ReplaceEmoji(Match match) => _emojis[match.Groups[2].Value];
+            return _emojiCode.Replace(value, ReplaceEmoji);
+        }
+    }
+}

src/Spectre.Console/Spectre.Console.csproj

@@ -20,6 +20,9 @@
     <Compile Update="Border.*.cs">
       <DependentUpon>Border.cs</DependentUpon>
     </Compile>
+    <Compile Update="Emoji.*.cs">
+      <DependentUpon>Emoji.cs</DependentUpon>
+    </Compile>
     <Compile Update="Extensions/AnsiConsoleExtensions.*.cs">
       <DependentUpon>Extensions/AnsiConsoleExtensions.cs</DependentUpon>
     </Compile>