clawbot
64eaceb0ef
Slugify lowercases text and keeps only ASCII letters and digits, turning every run of other characters into a single hyphen with none left at either end. Comes with a doc comment and table-driven tests. (closes #9) Model: opus-5
37 lines
1.1 KiB
Go
37 lines
1.1 KiB
Go
package util
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import "strings"
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// Slugify returns input as lowercase ASCII letters, digits and hyphens, which
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// is safe to put in a URL path, a filename or a fragment identifier. Every run
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// of other characters becomes a single hyphen, and the result never starts or
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// ends with one.
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//
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// Characters outside ASCII are treated as separators rather than being folded
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// to their nearest ASCII relative, because doing that properly needs a Unicode
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// table that this package does not carry. Text with no ASCII letters or digits
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// in it therefore slugifies to an empty string.
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func Slugify(input string) string {
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var out strings.Builder
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pendingHyphen := false
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for _, character := range strings.ToLower(input) {
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if (character >= 'a' && character <= 'z') || (character >= '0' && character <= '9') {
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if pendingHyphen {
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out.WriteByte('-')
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pendingHyphen = false
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}
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out.WriteRune(character)
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continue
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}
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// Remember that a separator was seen, but only write a hyphen once
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// another usable character turns up, so nothing trails off the end.
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if out.Len() > 0 {
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pendingHyphen = true
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}
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}
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return out.String()
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}
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