Use GNU unified diff terms

Author: dougthor42

Lib/_colorize.py

@@ -212,9 +212,9 @@ class Difflib(ThemeSection):
     """A 'git diff'-like theme for `difflib.unified_diff`."""
     header: str = ANSIColors.BOLD  # eg "---" and "+++" lines
     hunk: str = ANSIColors.CYAN  # the "@@" lines
-    equal: str = ANSIColors.RESET  # context lines
-    insert: str = ANSIColors.GREEN
-    delete: str = ANSIColors.RED
+    context: str = ANSIColors.RESET  # context lines
+    added: str = ANSIColors.GREEN
+    removed: str = ANSIColors.RED
     reset: str = ANSIColors.RESET
 
 

Lib/difflib.py

@@ -1161,14 +1161,14 @@ def unified_diff(a, b, fromfile='', tofile='', fromfiledate='',
         for tag, i1, i2, j1, j2 in group:
             if tag == 'equal':
                 for line in a[i1:i2]:
-                    yield f'{t.equal} {line}{t.reset}'
+                    yield f'{t.context} {line}{t.reset}'
                 continue
             if tag in {'replace', 'delete'}:
                 for line in a[i1:i2]:
-                    yield f'{t.delete}-{line}{t.reset}'
+                    yield f'{t.removed}-{line}{t.reset}'
             if tag in {'replace', 'insert'}:
                 for line in b[j1:j2]:
-                    yield f'{t.insert}+{line}{t.reset}'
+                    yield f'{t.added}+{line}{t.reset}'
 
 
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