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- // 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 (
- "crypto/rand"
- "math/big"
- "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 ""
- }
- // RandomChars returns a generated string in given number of random characters.
- func RandomChars(n int) (string, error) {
- const alphanum = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
- randomInt := func(max *big.Int) (int, error) {
- r, err := rand.Int(rand.Reader, max)
- if err != nil {
- return 0, err
- }
- return int(r.Int64()), nil
- }
- buffer := make([]byte, n)
- max := big.NewInt(int64(len(alphanum)))
- for i := 0; i < n; i++ {
- index, err := randomInt(max)
- if err != nil {
- return "", err
- }
- buffer[i] = alphanum[index]
- }
- return string(buffer), nil
- }
- // Ellipsis returns a truncated string and appends "..." to the end of the
- // string if the string length is larger than the threshold. Otherwise, the
- // original string is returned.
- func Ellipsis(str string, threshold int) string {
- if len(str) <= threshold || threshold < 0 {
- return str
- }
- return str[:threshold] + "..."
- }
- // Truncate returns a truncated string if its length is over the limit.
- // Otherwise, it returns the original string.
- func Truncate(str string, limit int) string {
- if len(str) < limit {
- return str
- }
- return str[:limit]
- }
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