2 files changed, 60 insertions, 0 deletions
diff --git a/internal/strutil/strutil.go b/internal/strutil/strutil.go
new file mode 100644
index 00000000..a2b84a20
--- /dev/null
+++ b/internal/strutil/strutil.go
@@ -0,0 +1,17 @@
+// Copyright 2020 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package strutil
+
+import (
+	"unicode"
+)
+
+// ToUpperFirst returns s with only the first Unicode letter mapped to its upper case.
+func ToUpperFirst(s string) string {
+	for i, v := range s {
+		return string(unicode.ToUpper(v)) + s[i+1:]
+	}
+	return ""
+}
diff --git a/internal/strutil/strutil_test.go b/internal/strutil/strutil_test.go
new file mode 100644
index 00000000..d603533b
--- /dev/null
+++ b/internal/strutil/strutil_test.go
@@ -0,0 +1,43 @@
+// Copyright 2020 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package strutil
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestToUpperFirst(t *testing.T) {
+	tests := []struct {
+		name   string
+		s      string
+		expStr string
+	}{
+		{
+			name: "empty string",
+		},
+		{
+			name:   "first letter is a digit",
+			s:      "123 let's go",
+			expStr: "123 let's go",
+		},
+		{
+			name:   "lower to upper",
+			s:      "this is a sentence",
+			expStr: "This is a sentence",
+		},
+		{
+			name:   "already in upper case",
+			s:      "Let's go",
+			expStr: "Let's go",
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			assert.Equal(t, test.expStr, ToUpperFirst(test.s))
+		})
+	}
+}