red: diff syntax added

data/lib/red/presets.lua

@@ -5,4 +5,5 @@ return {
   {"%.go$", { ts = 8, spaces_tab = false, trim_spaces = true } },
   {"%.py$", { ts = 4, spaces_tab = true, trim_spaces = true } },
   {"%.md$", { ts = 2, spaces_tab = true, trim_spaces = true, syntax = "markdown" } },
+  {"%.diff$", { ts = 8, spaces_tab = false, trim_spaces = false, syntax = "diff" } },
 }

data/lib/red/syntax/diff.lua

@@ -0,0 +1,52 @@
+local scheme = require "red/syntax/scheme"
+
+local col = {
+  col = scheme.default,
+  {
+    linestart = 'diff ',
+    stop = '\n',
+    col = scheme.number,
+  },
+  {
+    linestart = 'index ',
+    stop = '\n',
+    col = scheme.number,
+  },
+  { -- section
+    linestart = '--- ',
+    stop = '\n',
+    col = scheme.lib,
+  },
+  { -- section
+    linestart = '+++ ',
+    stop = '\n',
+    col = scheme.lib,
+  },
+  { -- add
+    linestart = '+',
+    stop = '\n',
+    col = { 0, 190, 0 },
+  },
+  { -- add
+    linestart = '>',
+    stop = '\n',
+    col = { 0, 190, 0 },
+  },
+  { -- del
+    linestart = '-',
+    stop = '\n',
+    col = {255, 0, 0 },
+  },
+  { -- del
+    linestart = '<',
+    stop = '\n',
+    col = {255, 0, 0 },
+  },
+  {
+    linestart = '@@ ',
+    stop = '\n',
+    col = scheme.string,
+  }
+}
+
+return col