nixpkgs/doc/doc-support/lib-function-locations.nix

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{ pkgs, nixpkgs ? { }, libsets }:
let
revision = pkgs.lib.trivial.revisionWithDefault (nixpkgs.revision or "master");
libDefPos = prefix: set:
builtins.concatMap
(name: [{
name = builtins.concatStringsSep "." (prefix ++ [name]);
location = builtins.unsafeGetAttrPos name set;
}] ++ nixpkgsLib.optionals
(builtins.length prefix == 0 && builtins.isAttrs set.${name})
(libDefPos (prefix ++ [name]) set.${name})
) (builtins.attrNames set);
libset = toplib:
builtins.map
(subsetname: {
subsetname = subsetname;
functions = libDefPos [] toplib.${subsetname};
})
(builtins.map (x: x.name) libsets);
nixpkgsLib = pkgs.lib;
flattenedLibSubset = { subsetname, functions }:
builtins.map
(fn: {
name = "lib.${subsetname}.${fn.name}";
value = fn.location;
})
functions;
locatedlibsets = libs: builtins.map flattenedLibSubset (libset libs);
removeFilenamePrefix = prefix: filename:
let
prefixLen = (builtins.stringLength prefix) + 1; # +1 to remove the leading /
filenameLen = builtins.stringLength filename;
substr = builtins.substring prefixLen filenameLen filename;
in substr;
removeNixpkgs = removeFilenamePrefix (builtins.toString pkgs.path);
liblocations =
builtins.filter
(elem: elem.value != null)
(nixpkgsLib.lists.flatten
(locatedlibsets nixpkgsLib));
fnLocationRelative = { name, value }:
{
inherit name;
value = value // { file = removeNixpkgs value.file; };
};
relativeLocs = (builtins.map fnLocationRelative liblocations);
sanitizeId = builtins.replaceStrings
[ "'" ]
[ "-prime" ];
urlPrefix = "https://github.com/NixOS/nixpkgs/blob/${revision}";
xmlstrings = (nixpkgsLib.strings.concatMapStrings
({ name, value }:
''
<section><title>${name}</title>
<para xml:id="${sanitizeId name}">
Located at
<link
xlink:href="${urlPrefix}/${value.file}#L${builtins.toString value.line}">${value.file}:${builtins.toString value.line}</link>
in <literal>&lt;nixpkgs&gt;</literal>.
</para>
</section>
'')
relativeLocs);
in pkgs.writeText
"locations.xml"
''
<section xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
version="5">
<title>All the locations for every lib function</title>
<para>This file is only for inclusion by other files.</para>
${xmlstrings}
</section>
''