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Expanded shortlink character set

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Switching out to a 30 character set means the codes are shorter (by 2 chars 😂) and look a little prettier.
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JP Hastings-Spital 2024-07-16 15:55:42 +01:00
parent 54e228b62f
commit 079e2edd5a
1 changed files with 27 additions and 3 deletions
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30
layouts/partials/shortlink.txt
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@ -1,6 +1,30 @@
{{- $shortlink := .Params.shortlink -}}
{{- if not $shortlink -}}
{{/* TODO: Could convert to base36 to reduce size by 2 chars */}}
{{- $shortlink = printf "b/%s" (substr (.RelPermalink | crypto.MD5 ) 0 10) -}}
{{- $chars := split "123456789bcdfghjkmnpqrstuvwxyz" "" -}}{{/* Omit vowels and confusing characters to prevent accidental spelling of words */}}
{{- $base := len $chars -}}
{{- $size := 8 -}}{{/* 8 chars with 30 possibilities means 0.0091% chance of collision with 10k posts; I currently have 3,213 */}}
{{- if and (not $shortlink) true -}}{{/* .IsPage Don't make dynamic shortlinks for list taxonomy/list/non-regular pages */}}
{{- $hex := .RelPermalink | crypto.MD5 -}}
{{- $idx := 0 -}}
{{- $n := 0 -}}
{{- $enc := slice -}}
{{- range (split $hex "") | collections.Reverse -}}
{{- $dec := int (printf "0x%s" .) -}}
{{- $n = add $dec (mul $n 16) -}}
{{- range seq 2 -}}
{{- if le $n $base -}}{{ break }}{{- end -}}
{{- $amt := (mod $n $base) -}}
{{- $char := index $chars $amt }}
{{- $enc = $enc | append $char -}}
{{- $n = div $n $base -}}
{{- end -}}
{{- if ge (len $enc) $size -}}{{- break -}}{{- end -}}
{{- end -}}
{{- $shortlink = printf "b/%s" (delimit ($enc | collections.Reverse) "") -}}
{{- end -}}
{{- $shortlink -}}