forked from Shiloh/githaven
36 lines
812 B
Go
36 lines
812 B
Go
|
// 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
|
||
|
|
}
|