Golang : Create unique title slugs example
A simple example on how to create title slug from a string and also demonstrate what you can do in case the title slug is not unique after querying the database. In this example, we append the number from 1 to 10 in case there's a conflict of title slugs in the database. The range of numbers from 1 to 10 should be sufficient. Feel free to increase to 100 to ensure there are more rooms to generate unique title slugs.
Here you go!
package main
import (
"fmt"
"golang.org/x/text/transform"
"golang.org/x/text/unicode/norm"
"regexp"
"strconv"
"strings"
"unicode"
)
func isMn(r rune) bool {
return unicode.Is(unicode.Mn, r) // Mn: nonspacing marks
}
func stringToSlug(s string) (string, error) {
str := []byte(strings.ToLower(s))
// convert all spaces to dash
regE := regexp.MustCompile("[[:space:]]")
str = regE.ReplaceAll(str, []byte("-"))
// remove all blanks such as tab
regE = regexp.MustCompile("[[:blank:]]")
str = regE.ReplaceAll(str, []byte(""))
// remove all punctuations with the exception of dash
regE = regexp.MustCompile("[!/:-@[-`{-~]")
str = regE.ReplaceAll(str, []byte(""))
regE = regexp.MustCompile("/[^\x20-\x7F]/")
str = regE.ReplaceAll(str, []byte(""))
regE = regexp.MustCompile("`&(amp;)?#?[a-z0-9]+;`i")
str = regE.ReplaceAll(str, []byte("-"))
regE = regexp.MustCompile("`&([a-z])(acute|uml|circ|grave|ring|cedil|slash|tilde|caron|lig|quot|rsquo);`i")
str = regE.ReplaceAll(str, []byte("\\1"))
regE = regexp.MustCompile("`[^a-z0-9]`i")
str = regE.ReplaceAll(str, []byte("-"))
regE = regexp.MustCompile("`[-]+`")
str = regE.ReplaceAll(str, []byte("-"))
strReplaced := strings.Replace(string(str), "&", "", -1)
strReplaced = strings.Replace(strReplaced, `"`, "", -1)
strReplaced = strings.Replace(strReplaced, "&", "-", -1)
strReplaced = strings.Replace(strReplaced, "--", "-", -1)
if strings.HasPrefix(strReplaced, "-") || strings.HasPrefix(strReplaced, "--") {
strReplaced = strings.TrimPrefix(strReplaced, "-")
strReplaced = strings.TrimPrefix(strReplaced, "--")
}
if strings.HasSuffix(strReplaced, "-") || strings.HasSuffix(strReplaced, "--") {
strReplaced = strings.TrimSuffix(strReplaced, "-")
strReplaced = strings.TrimSuffix(strReplaced, "--")
}
// normalize unicode strings and remove all diacritical/accents marks
// see https://www.socketloop.com/tutorials/golang-normalize-unicode-strings-for-comparison-purpose
t := transform.Chain(norm.NFD, transform.RemoveFunc(isMn), norm.NFC)
slug, _, err := transform.String(t, strReplaced)
if err != nil {
return "", err
}
return strings.TrimSpace(slug), nil
}
func main() {
testStr := "?This is a test-title with question mark ? and& \" exclaimation mark !"
testSlug, err := stringToSlug(testStr)
if err != nil {
panic(err)
}
fmt.Printf("%v to:\n %v\n", testStr, testSlug)
// in case you encounter a situation where the slug title is not unique after you query the database.
// just append a number the string with a number to make it unique
// NOTE : You will have to make a function of your own here to query your database
newSlug := ""
for i := 1; i <= 10; i++ {
newSlug = testSlug + "-" + strconv.Itoa(i)
// here is where you want to query your database
// if newSlug is unique, break
// let's pretend that number 5 is unique after querying
// the database 5 times.
if i == 5 {
break
}
}
// our unique slug title
fmt.Println(newSlug)
}
Output:
?This is a test-title with question mark ? and& " exclaimation mark ! to:
this-is-a-test-title-with-question-mark-and-exclaimation-mark
this-is-a-test-title-with-question-mark-and-exclaimation-mark-5
NOTE: Before inserting the title slugs into your database, it would be advisable to trim the title first.
References:
https://www.socketloop.com/tutorials/golang-format-strings-to-seo-friendly-url-example
https://www.socketloop.com/tutorials/golang-increment-string-example
See also : Golang : Format strings to SEO friendly URL example
By Adam Ng
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