doc: manual fixup after migration
This commit is contained in:
Johannes Kirschbauer
parent
f917ed536b
commit
56b5634a90
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@ -63,11 +63,8 @@ rec {
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:::
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*/
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attrByPath =
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# A list of strings representing the attribute path to return from `set`
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attrPath:
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# Default value if `attrPath` does not resolve to an existing value
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default:
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# The nested attribute set to select values from
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set:
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let
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lenAttrPath = length attrPath;
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@ -134,9 +131,7 @@ rec {
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:::
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*/
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hasAttrByPath =
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# A list of strings representing the attribute path to check from `set`
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attrPath:
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# The nested attribute set to check
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e:
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let
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lenAttrPath = length attrPath;
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@ -205,9 +200,7 @@ rec {
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:::
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*/
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longestValidPathPrefix =
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# A list of strings representing the longest possible path that may be returned.
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attrPath:
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# The nested attribute set to check.
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v:
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let
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lenAttrPath = length attrPath;
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@ -270,9 +263,7 @@ rec {
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:::
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*/
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setAttrByPath =
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# A list of strings representing the attribute path to set
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attrPath:
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# The value to set at the location described by `attrPath`
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value:
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let
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len = length attrPath;
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@ -284,15 +275,15 @@ rec {
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/**
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Like `attrByPath`, but without a default value. If it doesn't find the
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path it will throw an error.
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path it will throw an error.
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Nix has an [attribute selection operator](https://nixos.org/manual/nix/stable/language/operators#attribute-selection) which is sufficient for such queries, as long as the number of attributes is static. For example:
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Nix has an [attribute selection operator](https://nixos.org/manual/nix/stable/language/operators#attribute-selection) which is sufficient for such queries, as long as the number of attributes is static. For example:
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```nix
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x.a.b == getAttrByPath ["a" "b"] x
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# and
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x.${f p}."example.com" == getAttrByPath [ (f p) "example.com" ] x
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```
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x.a.b == getAttrByPath ["a" "b"] x
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# and
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x.${f p}."example.com" == getAttrByPath [ (f p) "example.com" ] x
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```
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# Inputs
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@ -326,9 +317,7 @@ rec {
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:::
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*/
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getAttrFromPath =
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# A list of strings representing the attribute path to get from `set`
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attrPath:
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# The nested attribute set to find the value in.
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set:
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attrByPath attrPath (abort ("cannot find attribute `" + concatStringsSep "." attrPath + "'")) set;
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@ -522,9 +511,7 @@ rec {
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:::
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*/
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attrVals =
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# The list of attributes to fetch from `set`. Each attribute name must exist on the attrbitue set
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nameList:
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# The set to get attribute values from
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set: map (x: set.${x}) nameList;
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@ -585,9 +572,7 @@ rec {
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:::
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*/
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getAttrs =
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# A list of attribute names to get out of `set`
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names:
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# The set to get the named attributes from
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attrs: genAttrs names (name: attrs.${name});
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/**
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@ -647,9 +632,7 @@ rec {
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:::
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*/
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filterAttrs =
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# Predicate taking an attribute name and an attribute value, which returns `true` to include the attribute, or `false` to exclude the attribute.
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pred:
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# The attribute set to filter
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set:
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listToAttrs (concatMap (name: let v = set.${name}; in if pred name v then [(nameValuePair name v)] else []) (attrNames set));
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@ -687,9 +670,7 @@ rec {
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:::
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*/
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filterAttrsRecursive =
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# Predicate taking an attribute name and an attribute value, which returns `true` to include the attribute, or `false` to exclude the attribute.
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pred:
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# The attribute set to filter
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set:
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listToAttrs (
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concatMap (name:
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@ -709,9 +690,9 @@ rec {
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The result of the callback function is often called `acc` for accumulator. It is passed between callbacks from left to right and the final `acc` is the return value of `foldlAttrs`.
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Attention:
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There is a completely different function
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`lib.foldAttrs`
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which has nothing to do with this function, despite the similar name.
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There is a completely different function `lib.foldAttrs`
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which has nothing to do with this function, despite the similar name.
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# Inputs
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@ -824,11 +805,8 @@ rec {
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:::
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*/
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foldAttrs =
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# A function, given a value and a collector combines the two.
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op:
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# The starting value.
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nul:
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# A list of attribute sets to fold together by key.
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list_of_attrs:
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foldr (n: a:
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foldr (name: o:
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@ -839,7 +817,7 @@ rec {
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/**
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Recursively collect sets that verify a given predicate named `pred`
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from the set `attrs`. The recursion is stopped when the predicate is
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from the set `attrs`. The recursion is stopped when the predicate is
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verified.
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@ -875,10 +853,8 @@ rec {
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:::
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*/
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collect =
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# Given an attribute's value, determine if recursion should stop.
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pred:
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# The attribute set to recursively collect.
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attrs:
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pred:
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attrs:
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if pred attrs then
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[ attrs ]
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else if isAttrs attrs then
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@ -919,7 +895,6 @@ rec {
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:::
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*/
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cartesianProductOfSets =
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# Attribute set with attributes that are lists of values
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attrsOfLists:
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foldl' (listOfAttrs: attrName:
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concatMap (attrs:
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@ -960,9 +935,7 @@ rec {
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:::
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*/
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nameValuePair =
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# Attribute name
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name:
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# Attribute value
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value:
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{ inherit name value; };
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@ -1026,9 +999,7 @@ rec {
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:::
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*/
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mapAttrs' =
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# A function, given an attribute's name and value, returns a new `nameValuePair`.
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f:
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# Attribute set to map over.
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set:
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listToAttrs (map (attr: f attr set.${attr}) (attrNames set));
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@ -1037,7 +1008,6 @@ rec {
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Call a function for each attribute in the given set and return
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the result in a list.
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# Inputs
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`f`
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@ -1067,9 +1037,7 @@ rec {
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:::
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*/
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mapAttrsToList =
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# A function, given an attribute's name and value, returns a new value.
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f:
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# Attribute set to map over.
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attrs:
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map (name: f name attrs.${name}) (attrNames attrs);
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@ -1139,9 +1107,7 @@ rec {
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```
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*/
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mapAttrsRecursive =
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# A function that, given an attribute path as a list of strings and the corresponding attribute value, returns a new value.
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f:
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# Attribute set to recursively map over.
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set:
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mapAttrsRecursiveCond (as: true) f set;
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@ -1170,12 +1136,8 @@ rec {
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```
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*/
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mapAttrsRecursiveCond =
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# A function that, given the attribute set the recursion is currently at, determines if to recurse deeper into that attribute set.
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cond:
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# A function that, given an attribute path as a list of strings and the corresponding attribute value, returns a new value.
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# The attribute value is either an attribute set for which `cond` returns false, or something other than an attribute set.
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f:
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# Attribute set to recursively map over.
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set:
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let
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recurse = path:
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@ -1221,9 +1183,7 @@ rec {
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:::
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*/
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genAttrs =
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# Names of values in the resulting attribute set.
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names:
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# A function, given the name of the attribute, returns the attribute's value.
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f:
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listToAttrs (map (n: nameValuePair n (f n)) names);
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@ -1260,7 +1220,6 @@ rec {
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:::
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*/
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isDerivation =
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# Value to check.
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value: value.type or null == "derivation";
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/**
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@ -1280,7 +1239,6 @@ rec {
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```
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*/
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toDerivation =
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# A store path to convert to a derivation.
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path:
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let
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path' = builtins.storePath path;
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@ -1330,9 +1288,7 @@ rec {
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:::
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*/
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optionalAttrs =
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# Condition under which the `as` attribute set is returned.
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cond:
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# The attribute set to return if `cond` is `true`.
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as:
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if cond then as else {};
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@ -1374,11 +1330,8 @@ rec {
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:::
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*/
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zipAttrsWithNames =
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# List of attribute names to zip.
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names:
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# A function, accepts an attribute name, all the values, and returns a combined value.
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f:
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# List of values from the list of attribute sets.
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sets:
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listToAttrs (map (name: {
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inherit name;
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@ -1551,11 +1504,8 @@ rec {
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:::
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*/
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recursiveUpdateUntil =
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# Predicate, taking the path to the current attribute as a list of strings for attribute names, and the two values at that path from the original arguments.
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pred:
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# Left attribute set of the merge.
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lhs:
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# Right attribute set of the merge.
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rhs:
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let f = attrPath:
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zipAttrsWith (n: values:
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@ -1613,9 +1563,7 @@ rec {
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:::
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*/
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recursiveUpdate =
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# Left attribute set of the merge.
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lhs:
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# Right attribute set of the merge.
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rhs:
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recursiveUpdateUntil (path: lhs: rhs: !(isAttrs lhs && isAttrs rhs)) lhs rhs;
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@ -1654,9 +1602,7 @@ rec {
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:::
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*/
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matchAttrs =
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# Attribute set structure to match
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pattern:
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# Attribute set to check
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attrs:
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assert isAttrs pattern;
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all
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@ -1712,9 +1658,7 @@ rec {
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:::
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*/
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overrideExisting =
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# Original attribute set
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old:
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# Attribute set with attributes to override in `old`.
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new:
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mapAttrs (name: value: new.${name} or value) old;
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@ -1752,7 +1696,6 @@ rec {
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:::
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*/
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showAttrPath =
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# Attribute path to render to a string
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path:
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if path == [] then "<root attribute path>"
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else concatMapStringsSep "." escapeNixIdentifier path;
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@ -1937,7 +1880,6 @@ rec {
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:::
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*/
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recurseIntoAttrs =
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# An attribute set to scan for derivations.
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attrs:
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attrs // { recurseForDerivations = true; };
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@ -1958,7 +1900,6 @@ rec {
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```
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*/
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dontRecurseIntoAttrs =
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# An attribute set to not scan for derivations.
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attrs:
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attrs // { recurseForDerivations = false; };
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