From b8685fc5df2e8691ea6073b0bbdcf32a6833f90e Mon Sep 17 00:00:00 2001
From: Roland Walker <walker@pobox.com>
Date: Sat, 12 Aug 2017 09:09:37 -0400
Subject: [PATCH] make uppercase detection Unicode-aware

---
 include/tig/string.h |  2 ++
 src/search.c         | 12 +-----------
 src/string.c         | 26 ++++++++++++++++++++++++++
 3 files changed, 29 insertions(+), 11 deletions(-)

diff --git a/include/tig/string.h b/include/tig/string.h
index 08cece548..509082bc9 100644
--- a/include/tig/string.h
+++ b/include/tig/string.h
@@ -21,6 +21,8 @@
  * Strings.
  */
 
+bool string_contains_uppercase(const char *search);
+
 #define prefixcmp(str1, str2) \
 	strncmp(str1, str2, STRING_SIZE(str2))
 
diff --git a/src/search.c b/src/search.c
index fa9797be1..f3375abe4 100644
--- a/src/search.c
+++ b/src/search.c
@@ -57,16 +57,6 @@ find_matches(struct view *view)
 
 static enum status_code find_next_match(struct view *view, enum request request);
 
-static bool contains_uppercase(const char *search)
-{
-	const char *c = search;
-	for (; *c != '\0'; ++c) {
-		if (isupper(*c))
-			return true;
-	}
-	return false;
-}
-
 static enum status_code
 setup_and_find_next(struct view *view, enum request request)
 {
@@ -74,7 +64,7 @@ setup_and_find_next(struct view *view, enum request request)
 	int regex_flags = opt_ignore_case == IGNORE_CASE_YES ? REG_ICASE : 0;
 
 	if (opt_ignore_case == IGNORE_CASE_SMART_CASE
-	    && !contains_uppercase(view->env->search))
+	    && !string_contains_uppercase(view->env->search))
 		regex_flags |= REG_ICASE;
 
 	if (view->regex) {
diff --git a/src/string.c b/src/string.c
index 1ef352d91..a4d5b04f3 100644
--- a/src/string.c
+++ b/src/string.c
@@ -19,6 +19,32 @@
  * Strings.
  */
 
+#ifdef HAVE_ICU
+bool string_contains_uppercase(const char *search)
+{
+	int32_t i;
+	int32_t len = strlen(search);
+	UChar32 c;
+
+	for(i = 0; i < len;) {
+		U8_NEXT(search, i, len, c);
+		if (u_isUUppercase(c))
+			return true;
+	}
+	return false;
+}
+#else
+bool string_contains_uppercase(const char *search)
+{
+	const char *c = search;
+	for (; *c != '\0'; ++c) {
+		if (isupper(*c))
+			return true;
+	}
+	return false;
+}
+#endif
+
 bool
 string_isnumber(const char *str)
 {