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- // Copyright 2021 The Gitea 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 util
-
- import "unicode/utf8"
-
- // 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 {
- left = input
- return
- }
-
- if !utf8.ValidString(input) {
- left = input[:n-3] + "..."
- right = "..." + input[n-3:]
- return
- }
-
- // in UTF8 "…" is 3 bytes so doesn't really gain us anything...
- end := 0
- for end <= n-3 {
- _, size := utf8.DecodeRuneInString(input[end:])
- if end+size > n-3 {
- break
- }
- end += size
- }
-
- left = input[:end] + "…"
- right = "…" + input[end:]
- return
- }
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