1 files changed, 54 insertions, 0 deletions
diff --git a/modules/util/truncate.go b/modules/util/truncate.go
new file mode 100644
index 0000000..77b116e
--- /dev/null
+++ b/modules/util/truncate.go
@@ -0,0 +1,54 @@
+// Copyright 2021 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package util
+
+import (
+	"strings"
+	"unicode/utf8"
+)
+
+// in UTF8 "…" is 3 bytes so doesn't really gain us anything...
+const (
+	utf8Ellipsis  = "…"
+	asciiEllipsis = "..."
+)
+
+// SplitStringAtByteN splits a string at byte n accounting for rune boundaries. (Combining characters are not accounted for.)
+func SplitStringAtByteN(input string, n int) (left, right string) {
+	if len(input) <= n {
+		return input, ""
+	}
+
+	if !utf8.ValidString(input) {
+		if n-3 < 0 {
+			return input, ""
+		}
+		return input[:n-3] + asciiEllipsis, asciiEllipsis + input[n-3:]
+	}
+
+	end := 0
+	for end <= n-3 {
+		_, size := utf8.DecodeRuneInString(input[end:])
+		if end+size > n-3 {
+			break
+		}
+		end += size
+	}
+
+	return input[:end] + utf8Ellipsis, utf8Ellipsis + input[end:]
+}
+
+// SplitTrimSpace splits the string at given separator and trims leading and trailing space
+func SplitTrimSpace(input, sep string) []string {
+	// replace CRLF with LF
+	input = strings.ReplaceAll(input, "\r\n", "\n")
+
+	var stringList []string
+	for _, s := range strings.Split(input, sep) {
+		// trim leading and trailing space
+		stringList = append(stringList, strings.TrimSpace(s))
+	}
+
+	return stringList
+}