nix-super/doc/manual/generate-builtin-constants.nix

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let
inherit (builtins) concatStringsSep attrValues mapAttrs;
inherit (import <nix/utils.nix>) optionalString squash;
in
builtinsInfo:
let
showBuiltin = name: { doc, type, impure-only }:
let
type' = optionalString (type != null) " (${type})";
impureNotice = optionalString impure-only ''
> **Note**
>
> Not available in [pure evaluation mode](@docroot@/command-ref/conf-file.md#conf-pure-eval).
'';
in
squash ''
<dt id="builtins-${name}">
<a href="#builtins-${name}"><code>${name}</code></a>${type'}
</dt>
<dd>
${doc}
${impureNotice}
</dd>
'';
in
concatStringsSep "\n" (attrValues (mapAttrs showBuiltin builtinsInfo))