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package manager
import (
"regexp"
"strings"
"unicode"
"github.com/bosssauce/ponzu/management/editor"
"golang.org/x/text/transform"
"golang.org/x/text/unicode/norm"
)
// Slug returns a URL friendly string from the title of a post item
func Slug(e editor.Editable) (string, error) {
// get the name of the post item
name := strings.TrimSpace(e.ContentName())
// filter out non-alphanumeric character or non-whitespace
slug, err := stringToSlug(name)
if err != nil {
return "", err
}
return slug, nil
}
func isMn(r rune) bool {
return unicode.Is(unicode.Mn, r) // Mn: nonspacing marks
}
// modified version of: https://www.socketloop.com/tutorials/golang-format-strings-to-seo-friendly-url-example
func stringToSlug(s string) (string, error) {
src := []byte(strings.ToLower(s))
// convert all spaces to dash
rx := regexp.MustCompile("[[:space:]]")
src = rx.ReplaceAll(src, []byte("-"))
// remove all blanks such as tab
rx = regexp.MustCompile("[[:blank:]]")
src = rx.ReplaceAll(src, []byte(""))
rx = regexp.MustCompile("[!/:-@[-`{-~]")
src = rx.ReplaceAll(src, []byte(""))
rx = regexp.MustCompile("/[^\x20-\x7F]/")
src = rx.ReplaceAll(src, []byte(""))
rx = regexp.MustCompile("`&(amp;)?#?[a-z0-9]+;`i")
src = rx.ReplaceAll(src, []byte("-"))
rx = regexp.MustCompile("`&([a-z])(acute|uml|circ|grave|ring|cedil|slash|tilde|caron|lig|quot|rsquo);`i")
src = rx.ReplaceAll(src, []byte("\\1"))
rx = regexp.MustCompile("`[^a-z0-9]`i")
src = rx.ReplaceAll(src, []byte("-"))
rx = regexp.MustCompile("`[-]+`")
src = rx.ReplaceAll(src, []byte("-"))
str := strings.Replace(string(src), "'", "", -1)
str = strings.Replace(str, `"`, "", -1)
t := transform.Chain(norm.NFD, transform.RemoveFunc(isMn), norm.NFC)
slug, _, err := transform.String(t, str)
if err != nil {
return "", err
}
return strings.TrimSpace(slug), nil
}
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