From 3f0e6a5806aba76037d53476e991cce045de16e4 Mon Sep 17 00:00:00 2001
From: Junegunn Choi <junegunn.c@gmail.com>
Date: Tue, 21 Apr 2015 22:10:14 +0900
Subject: Fix #209 - Invalid mutation of input on case conversion

---
 src/algo/algo.go | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'src/algo')

diff --git a/src/algo/algo.go b/src/algo/algo.go
index c1c07f3e..3d5edb09 100644
--- a/src/algo/algo.go
+++ b/src/algo/algo.go
@@ -42,10 +42,8 @@ func FuzzyMatch(caseSensitive bool, runes *[]rune, pattern []rune) (int, int) {
 			// compiler as of now does not inline non-leaf functions.)
 			if char >= 'A' && char <= 'Z' {
 				char += 32
-				(*runes)[index] = char
 			} else if char > unicode.MaxASCII {
 				char = unicode.To(unicode.LowerCase, char)
-				(*runes)[index] = char
 			}
 		}
 		if char == pattern[pidx] {
@@ -63,6 +61,13 @@ func FuzzyMatch(caseSensitive bool, runes *[]rune, pattern []rune) (int, int) {
 		pidx--
 		for index := eidx - 1; index >= sidx; index-- {
 			char := (*runes)[index]
+			if !caseSensitive {
+				if char >= 'A' && char <= 'Z' {
+					char += 32
+				} else if char > unicode.MaxASCII {
+					char = unicode.To(unicode.LowerCase, char)
+				}
+			}
 			if char == pattern[pidx] {
 				if pidx--; pidx < 0 {
 					sidx = index
-- 
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