From 47259c7d220fc927a6d1e8b3fafbb06c5962ac5d Mon Sep 17 00:00:00 2001
From: Yonghwan SO <scinix@gmail.com>
Date: Fri, 24 Feb 2023 23:33:04 +0900
Subject: [PATCH] fixed incorrect titleizing of unicode string

---
 go.mod           |  2 ++
 humanize_test.go |  1 +
 titleize.go      | 14 +++++++++++---
 titleize_test.go |  2 ++
 4 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/go.mod b/go.mod
index e7c6303..66bab2d 100644
--- a/go.mod
+++ b/go.mod
@@ -5,3 +5,5 @@ go 1.16
 exclude github.com/stretchr/testify v1.7.1
 
 require github.com/stretchr/testify v1.8.1
+
+retract [v1.0.0, v1.0.1]
diff --git a/humanize_test.go b/humanize_test.go
index b2a963a..2186dde 100644
--- a/humanize_test.go
+++ b/humanize_test.go
@@ -20,6 +20,7 @@ func Test_Humanize(t *testing.T) {
 		{"first_name", "First name"},
 		{"first_Name", "First Name"},
 		{"firstName", "First Name"},
+		{"óbito", "Óbito"},
 	}
 
 	for _, tt := range table {
diff --git a/titleize.go b/titleize.go
index cbbf08a..0878ada 100644
--- a/titleize.go
+++ b/titleize.go
@@ -19,12 +19,20 @@ func Titleize(s string) string {
 //	"This is `code` ok" = "This Is `code` OK"
 func (i Ident) Titleize() Ident {
 	var parts []string
+
+	// TODO: we need to reconsider the design.
+	//       this approach preserves inline code block as is but it also
+	//       preserves the other words start with a special character.
+	//       I would prefer: "*wonderful* world" to be "*Wonderful* World"
 	for _, part := range i.Parts {
-		x := string(unicode.ToTitle(rune(part[0])))
-		if len(part) > 1 {
-			x += part[1:]
+		// CAUTION: in unicode, []rune(str)[0] is not rune(str[0])
+		runes := []rune(part)
+		x := string(unicode.ToTitle(runes[0]))
+		if len(runes) > 1 {
+			x += string(runes[1:])
 		}
 		parts = append(parts, x)
 	}
+
 	return New(strings.Join(parts, " "))
 }
diff --git a/titleize_test.go b/titleize_test.go
index ac0975a..8e6c44a 100644
--- a/titleize_test.go
+++ b/titleize_test.go
@@ -12,11 +12,13 @@ func Test_Titleize(t *testing.T) {
 		{"bob dylan", "Bob Dylan"},
 		{"Nice to see you!", "Nice To See You!"},
 		{"*hello*", "*hello*"},
+		{"hello *wonderful* world!", "Hello *wonderful* World!"}, // CHKME
 		{"i've read a book! have you?", "I've Read A Book! Have You?"},
 		{"This is `code` ok", "This Is `code` OK"},
 		{"foo_bar", "Foo Bar"},
 		{"admin/widget", "Admin Widget"},
 		{"widget", "Widget"},
+		{"óbito", "Óbito"},
 	}
 
 	for _, tt := range table {