Support for diff

ColorCode.Core/Common/ScopeName.cs

@@ -60,5 +60,9 @@ public class ScopeName
         public const string Intrinsic = "Intrinsic";
         public const string Brackets = "Brackets";
         public const string Continuation = "Continuation";
+        public const string DiffAddition = "DiffAddition";
+        public const string DiffDeletion = "DiffDeletion";
+        public const string DiffMeta = "DiffMeta";
+        public const string DiffComment = "DiffComment";
     }
-}
+}

ColorCode.Core/Compilation/Languages/Diff.cs

@@ -0,0 +1,92 @@
+// Copyright (c) 2015 Christopher Pardi.
+
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+
+using System.Collections.Generic;
+using ColorCode.Common;
+
+namespace ColorCode.Compilation.Languages
+{
+    public class Diff : ILanguage
+    {
+        public string Id
+        {
+            get { return LanguageId.Diff; }
+        }
+
+        public string Name
+        {
+            get { return "Diff"; }
+        }
+
+        public string CssClassName
+        {
+            get { return "diff"; }
+        }
+
+        public string FirstLinePattern
+        {
+            get
+            {
+                return null;
+            }
+        }
+
+        public IList<LanguageRule> Rules
+        {
+            get
+            {
+                return new List<LanguageRule>
+                           {
+                               new LanguageRule(
+                                   @"^(((---)|(\*\*\*)) +\d+,\d+ +((----)|(\*\*\*\*))|@@ +\-\d+,\d+ \+\d+,\d+ +@@)(\r?\n?)",
+                                   new Dictionary<int, string>
+                                       {
+                                           { 0, ScopeName.DiffMeta },
+                                       }),
+                               new LanguageRule(
+                                   @"^(\*{5}).*(\*{5})(\r?\n?)",
+                                   new Dictionary<int, string>
+                                       {
+                                           { 0, ScopeName.DiffComment },
+                                       }),
+                               new LanguageRule(
+                                   @"^((-{3,})|(\*{3,})|(\+{3,})|(Index:)|(={3,})).*(\r?\n?)",
+                                   new Dictionary<int, string>
+                                       {
+                                           { 0, ScopeName.DiffComment },
+                                       }),
+                                new LanguageRule(
+                                   @"(^(\+|!).*(\r?\n?))",
+                                   new Dictionary<int, string>
+                                       {
+                                           { 0, ScopeName.DiffAddition },
+                                       }),
+                                new LanguageRule(
+                                   @"^\-.*(\r?\n?)",
+                                   new Dictionary<int, string>
+                                       {
+                                           { 0, ScopeName.DiffDeletion },
+                                       }),
+                           };
+            }
+        }
+
+        public bool HasAlias(string lang)
+        {
+            switch (lang.ToLower())
+            {
+                case "diff":
+                case "patch":
+                    return true;
+                default:
+                    return false;
+            }
+        }
+
+        public override string ToString()
+        {
+            return Name;
+        }
+    }
+}

ColorCode.Core/Languages.cs

@@ -44,6 +44,7 @@ static Languages()
             Load<Haskell>();
             Load<Markdown>();
             Load<Fortran>();
+            Load<Diff>();
         }
 
         /// <summary>
@@ -280,4 +281,4 @@ public static void Load(ILanguage language)
             LanguageRepository.Load(language);
         }
     }
-}
+}

ColorCode.Core/Styling/StyleDictionary.DefaultDark.cs

@@ -298,8 +298,28 @@ public static StyleDictionary DefaultDark
                     {
                         ReferenceName = "specialChar"
                     },
+                    new Style(ScopeName.DiffAddition)
+                    {
+                        Foreground = Green,
+                        ReferenceName = "diffAddition"
+                    },
+                    new Style(ScopeName.DiffDeletion)
+                    {
+                        Foreground = Red,
+                        ReferenceName = "diffDeletion"
+                    },
+                    new Style(ScopeName.DiffMeta)
+                    {
+                        Foreground = OrangeRed,
+                        ReferenceName = "diffMeta"
+                    },
+                    new Style(ScopeName.DiffComment)
+                    {
+                        Foreground = VSDarkGray,
+                        ReferenceName = "diffComment"
+                    }
                 };
             }
         }
     }
-}
+}

ColorCode.Core/Styling/StyleDictionary.DefaultLight.cs

@@ -281,8 +281,28 @@ public static StyleDictionary DefaultLight
                     {
                         ReferenceName = "specialChar"
                     },
+                    new Style(ScopeName.DiffAddition)
+                    {
+                        Foreground = Green,
+                        ReferenceName = "diffAddition"
+                    },
+                    new Style(ScopeName.DiffDeletion)
+                    {
+                        Foreground = Red,
+                        ReferenceName = "diffDeletion"
+                    },
+                    new Style(ScopeName.DiffMeta)
+                    {
+                        Foreground = OrangeRed,
+                        ReferenceName = "diffMeta"
+                    },
+                    new Style(ScopeName.DiffComment)
+                    {
+                        Foreground = Gray,
+                        ReferenceName = "diffComment"
+                    }
                 };
             }
         }
     }
-}
+}