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lib.attrsets: Introduce showAttrPath
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@ -4,7 +4,7 @@
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let
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inherit (builtins) head tail length;
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inherit (lib.trivial) id;
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inherit (lib.strings) concatStringsSep sanitizeDerivationName;
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inherit (lib.strings) concatStringsSep concatMapStringsSep escapeNixIdentifier sanitizeDerivationName;
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inherit (lib.lists) foldr foldl' concatMap concatLists elemAt all;
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in
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@ -477,6 +477,20 @@ rec {
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overrideExisting = old: new:
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mapAttrs (name: value: new.${name} or value) old;
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/* Turns a list of strings into a human-readable description of those
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strings represented as an attribute path. The result of this function is
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not intended to be machine-readable.
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Example:
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showAttrPath [ "foo" "10" "bar" ]
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=> "foo.\"10\".bar"
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showAttrPath []
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=> "<root attribute path>"
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*/
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showAttrPath = path:
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if path == [] then "<root attribute path>"
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else concatMapStringsSep "." escapeNixIdentifier path;
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/* Get a package output.
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If no output is found, fallback to `.out` and then to the default.
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@ -78,7 +78,7 @@ let
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mapAttrs' mapAttrsToList mapAttrsRecursive mapAttrsRecursiveCond
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genAttrs isDerivation toDerivation optionalAttrs
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zipAttrsWithNames zipAttrsWith zipAttrs recursiveUpdateUntil
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recursiveUpdate matchAttrs overrideExisting getOutput getBin
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recursiveUpdate matchAttrs overrideExisting showAttrPath getOutput getBin
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getLib getDev getMan chooseDevOutputs zipWithNames zip
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recurseIntoAttrs dontRecurseIntoAttrs cartesianProductOfSets;
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inherit (self.lists) singleton forEach foldr fold foldl foldl' imap0 imap1
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@ -761,4 +761,26 @@ runTests {
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{ a = 3; b = 30; c = 300; }
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];
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};
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# The example from the showAttrPath documentation
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testShowAttrPathExample = {
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expr = showAttrPath [ "foo" "10" "bar" ];
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expected = "foo.\"10\".bar";
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};
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testShowAttrPathEmpty = {
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expr = showAttrPath [];
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expected = "<root attribute path>";
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};
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testShowAttrPathVarious = {
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expr = showAttrPath [
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"."
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"foo"
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"2"
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"a2-b"
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"_bc'de"
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];
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expected = "\".\".foo.\"2\".a2-b._bc'de";
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};
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}
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