1 files changed, 32 insertions, 0 deletions
diff --git a/lexlua/diff.lua b/lexlua/diff.lua
new file mode 100644
index 000000000..a0c62d214
--- /dev/null
+++ b/lexlua/diff.lua
@@ -0,0 +1,32 @@
+-- Copyright 2006-2018 Mitchell mitchell.att.foicica.com. See License.txt.
+-- Diff LPeg lexer.
+
+local lexer = require('lexer')
+local token, word_match = lexer.token, lexer.word_match
+local P, R, S = lpeg.P, lpeg.R, lpeg.S
+
+local lex = lexer.new('diff', {lex_by_line = true})
+
+-- Text, separators, and file headers.
+lex:add_rule('index', token(lexer.COMMENT, 'Index: ' * lexer.any^0 * -1))
+lex:add_rule('separator', token(lexer.COMMENT, ('---' + P('*')^4 + P('=')^1) *
+                                               lexer.space^0 * -1))
+lex:add_rule('header', token('header', (P('*** ') + '--- ' + '+++ ') *
+                                       lexer.any^1))
+lex:add_style('header', lexer.STYLE_COMMENT)
+
+-- Location.
+lex:add_rule('location', token(lexer.NUMBER, ('@@' + lexer.digit^1 + '****') *
+                                             lexer.any^1))
+
+-- Additions, deletions, and changes.
+lex:add_rule('addition', token('addition', S('>+') * lexer.any^0))
+lex:add_style('addition', 'fore:$(color.green)')
+lex:add_rule('deletion', token('deletion', S('<-') * lexer.any^0))
+lex:add_style('deletion', 'fore:$(color.red)')
+lex:add_rule('change', token('change', '!' * lexer.any^0))
+lex:add_style('change', 'fore:$(color.yellow)')
+
+lex:add_rule('any_line', token(lexer.DEFAULT, lexer.any^1))
+
+return lex