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Add a common pattern used in jobs definition.

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svn path=/nixpkgs/trunk/; revision=13370
This commit is contained in:
Nicolas Pierron 2008-11-23 00:19:06 +00:00
parent 26212b62c7
commit b62298f7c7
1 changed files with 10 additions and 0 deletions
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10
pkgs/lib/default.nix
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@ -233,6 +233,16 @@ rec {
optionalString = cond: string: if cond then string else "";
# Return the second argument if the first one is true or the empty version
# of the second argument.
ifEnable = cond: val:
if cond then val
else if builtins.isList val then []
else if builtins.isAttrs val then {}
# else if builtins.isString val then ""
# else if builtins.isBoolean val then false
else null;
# Return a list of integers from `first' up to and including `last'.
range = first: last:
if builtins.lessThan last first