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added mergeAttr and concatList functions giving // and ++ a name

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svn path=/nixpkgs/trunk/; revision=13542
This commit is contained in:
Marc Weber 2008-12-02 12:26:20 +00:00
parent 1f69d4d1eb
commit bd0b75fe28
1 changed files with 4 additions and 3 deletions
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7
pkgs/lib/default.nix
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@ -81,8 +81,8 @@ rec {
# Concatenate a list of lists.
concatLists =
fold (x: y: x ++ y) [];
concatList = x : y : x ++ y;
concatLists = fold concatList [];
# Concatenate a list of strings.
@ -636,7 +636,8 @@ rec {
# iterates over a list of attributes collecting the attribute attr if it exists
catAttrs = attr : l : fold ( s : l : if (hasAttr attr s) then [(builtins.getAttr attr s)] ++ l else l) [] l;
mergeAttrs = fold ( x : y : x // y) {};
mergeAttr = x : y : x // y;
mergeAttrs = fold mergeAttr {};
attrVals = nameList : attrSet :
map (x: builtins.getAttr x attrSet) nameList;