nixpkgs/pkgs/lib/trivial.nix

rec {

  # Identity function.
  id = x: x;

  # Constant function.
  const = x: y: x;

  # Named versions corresponding to some builtin operators.
  concat = x: y: x ++ y;
  or = x: y: x || y;
  and = x: y: x && y;
  mergeAttrs = x: y: x // y;
  
  # Take a function and evaluate it with its own returned value.
  fix = f: let result = f result; in result;

}
* Split lib/default.nix into several files, as it had become a big mess. Also cleaned up some functions: - foldl appeared broken (it recursively called fold). - Renamed logicalAND/logicalOR to and/or. - Removed listOfListsToAttrs, eqStrings: obsolete. - Removed isInList, which does the same thing as elem. - stringToCharacters: don't return a "" at the end of the list. - Renamed concatList to concat, as concatList (singular) is a misnomer: it takes two lists. Likewise, renamed mergeAttr to mergeAttrs. misc.nix still contains a lot of stuff that should be refactored and moved to other files. svn path=/nixpkgs/trunk/; revision=14013 2009-02-09 16:51:03 +00:00			`rec {`

			`# Identity function.`
			`id = x: x;`

			`# Constant function.`
			`const = x: y: x;`

			`# Named versions corresponding to some builtin operators.`
			`concat = x: y: x ++ y;`
			`or = x: y: x \|\| y;`
			`and = x: y: x && y;`
svn path=/nixpkgs/trunk/; revision=16131 2009-07-02 08:58:30 +00:00			`mergeAttrs = x: y: x // y;`
* Split lib/default.nix into several files, as it had become a big mess. Also cleaned up some functions: - foldl appeared broken (it recursively called fold). - Renamed logicalAND/logicalOR to and/or. - Removed listOfListsToAttrs, eqStrings: obsolete. - Removed isInList, which does the same thing as elem. - stringToCharacters: don't return a "" at the end of the list. - Renamed concatList to concat, as concatList (singular) is a misnomer: it takes two lists. Likewise, renamed mergeAttr to mergeAttrs. misc.nix still contains a lot of stuff that should be refactored and moved to other files. svn path=/nixpkgs/trunk/; revision=14013 2009-02-09 16:51:03 +00:00
			`# Take a function and evaluate it with its own returned value.`
			`fix = f: let result = f result; in result;`

			`}`