From e94d9b7da77e89e60173316e2993be58e27ca0b3 Mon Sep 17 00:00:00 2001
From: Michael Lyons <github@michael.lyo.nz>
Date: Wed, 18 Dec 2024 15:15:20 -0500
Subject: [PATCH] [Diff] Side-by-side diff

---
 Diff/Diff.sublime-syntax         | 27 ++++++++++++++++++++++++++
 Diff/tests/syntax_test_diff.diff | 33 ++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)

diff --git a/Diff/Diff.sublime-syntax b/Diff/Diff.sublime-syntax
index 4dca8144e6..ea3a8e190d 100644
--- a/Diff/Diff.sublime-syntax
+++ b/Diff/Diff.sublime-syntax
@@ -40,6 +40,7 @@ contexts:
     - include: diff-deltas
     - include: diff3-edit
     - include: diff3-normal
+    - include: side-by-side
 
 ###[ HEADERS ]#################################################################
 
@@ -313,6 +314,32 @@ contexts:
     - match: ^(?:{{conflict_any}})
       scope: invalid.illegal.conflict.diff
 
+###[ SIDE-BY-SIDE ]############################################################
+
+  # https://www.gnu.org/software/diffutils/manual/diffutils.html#Side-by-Side
+  side-by-side:
+    - match: ^(.*)   (<)$
+      captures:
+        1: markup.deleted.diff
+        2: punctuation.definition.deleted.diff
+    - match: ^(.*)   (\()$
+      captures:
+        1: comment.line.diff
+        2: punctuation.definition.deleted.diff
+    - match: ^(.*)   ([\\|/])   (.*)$
+      captures:
+        1: markup.changed.diff
+        2: punctuation.definition.changed.diff
+        3: markup.changed.diff
+    - match: '^   {4,}(>)(?:   (.*))?$'
+      captures:
+        1: punctuation.definition.inserted.diff
+        2: markup.inserted.diff
+    - match: '^   {4,}(\))(?:   (.*))?$'
+      captures:
+        1: punctuation.definition.inserted.diff
+        2: comment.line.diff
+
 ###############################################################################
 
 variables:
diff --git a/Diff/tests/syntax_test_diff.diff b/Diff/tests/syntax_test_diff.diff
index 87a99aeabc..582560a4f3 100644
--- a/Diff/tests/syntax_test_diff.diff
+++ b/Diff/tests/syntax_test_diff.diff
@@ -562,3 +562,36 @@ hello()
 \^^^^^^^^^^^^^^^^ meta.block.conflict.diff
 \^^^^^^ punctuation.section.block.end.diff
 \       ^^^^^^^^^ entity.name.section.diff
+
+
+\ https://www.gnu.org/software/diffutils/manual/diffutils.html#Example-Side-by-Side
+The Way that can be told of is n   <
+\^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ markup.deleted.diff
+\                                  ^ punctuation.definition.deleted.diff
+The name that can be named is no   <
+\^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ markup.deleted.diff
+\                                  ^ punctuation.definition.deleted.diff
+The Nameless is the origin of He        The Nameless is the origin of He
+\^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ - markup
+The Named is the mother of all t   |    The named is the mother of all t
+\^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ markup.changed.diff
+\                                  ^ punctuation.definition.changed.diff
+\                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ markup.changed.diff
+                                   >
+\                                  ^ punctuation.definition.inserted.diff
+Therefore let there always be no        Therefore let there always be no
+  so we may see their subtlety,           so we may see their subtlety,
+And let there always be being,          And let there always be being,
+  so we may see their outcome.            so we may see their outcome.
+The two are the same,                   The two are the same,
+But after they are produced,            But after they are produced,
+  they have different names.              they have different names.
+                                   >    They both may be called deep and
+\                                  ^ punctuation.definition.inserted.diff
+\                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ markup.inserted.diff
+                                   >    Deeper and more profound,
+\                                  ^ punctuation.definition.inserted.diff
+\                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^ markup.inserted.diff
+                                   >    The door of all subtleties!
+\                                  ^ punctuation.definition.inserted.diff
+\                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ markup.inserted.diff