forked from Fediversity/Fediversity
41 lines
1 KiB
Nix
41 lines
1 KiB
Nix
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{ lib }:
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rec {
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/**
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Create a URL-safe slug from any string
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*/
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slug = str:
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let
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# Replace non-alphanumeric characters with hyphens
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replaced = join ""
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(
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builtins.map
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(c:
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if (c >= "a" && c <= "z") || (c >= "0" && c <= "9")
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then c
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else "-"
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)
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(with lib; stringToCharacters (toLower str)));
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# Remove leading and trailing hyphens
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trimHyphens = s:
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let
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matched = builtins.match "(-*)([^-].*[^-]|[^-])(-*)" s;
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in
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with lib; optionalString (!isNull matched) (builtins.elemAt matched 1);
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collapseHyphens = s:
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let
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result = builtins.replaceStrings [ "--" ] [ "-" ] s;
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in
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if result == s then s else collapseHyphens result;
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in
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trimHyphens (collapseHyphens replaced);
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join = lib.concatStringsSep;
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splitLines = s: with builtins; filter (x: !isList x) (split "\n" s);
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indent = prefix: s:
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join "\n" (map (x: if x == "" then x else "${prefix}${x}") (splitLines s));
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}
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