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235 lines
6.8 KiB
Nix
235 lines
6.8 KiB
Nix
# Utility functions.
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let
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inherit (builtins)
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head tail isList stringLength substring lessThan sub;
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in
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rec {
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innerSumArgs = f : x : y : (if y == null then (f x)
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else (innerSumArgs f (x // y)));
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sumArgs = f : innerSumArgs f {};
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innerPairMap = acc: f: l:
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if l == [] then acc else
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innerPairMap (acc ++ [(f (head l)(head (tail l)))])
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f (tail (tail l));
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pairMap = innerPairMap [];
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# "Fold" a binary function `op' between successive elements of
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# `list' with `nul' as the starting value, i.e., `fold op nul [x_1
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# x_2 ... x_n] == op x_1 (op x_2 ... (op x_n nul))'. (This is
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# Haskell's foldr).
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fold = op: nul: list:
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if list == []
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then nul
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else op (head list) (fold op nul (tail list));
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# Concatenate a list of lists.
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concatLists =
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fold (x: y: x ++ y) [];
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# Concatenate a list of strings.
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concatStrings =
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fold (x: y: x + y) "";
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# Place an element between each element of a list, e.g.,
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# `intersperse "," ["a" "b" "c"]' returns ["a" "," "b" "," "c"].
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intersperse = separator: list:
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if list == [] || tail list == []
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then list
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else [(head list) separator]
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++ (intersperse separator (tail list));
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concatStringsSep = separator: list:
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concatStrings (intersperse separator list);
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# Flatten the argument into a single list; that is, nested lists are
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# spliced into the top-level lists. E.g., `flatten [1 [2 [3] 4] 5]
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# == [1 2 3 4 5]' and `flatten 1 == [1]'.
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flatten = x:
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if isList x
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then fold (x: y: (flatten x) ++ y) [] x
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else [x];
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# Return an attribute from nested attribute sets. For instance ["x"
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# "y"] applied to some set e returns e.x.y, if it exists. The
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# default value is returned otherwise.
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getAttr = attrPath: default: e:
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let {
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attr = head attrPath;
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body =
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if attrPath == [] then e
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else if builtins ? hasAttr && builtins.hasAttr attr e
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then getAttr (tail attrPath) default (builtins.getAttr attr e)
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else default;
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};
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# Filter a list using a predicate; that is, return a list containing
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# every element from `list' for which `pred' returns true.
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filter = pred: list:
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fold (x: y: if pred x then [x] ++ y else y) [] list;
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# Return true if `list' has an element `x':
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elem = x: list: fold (a: bs: x == a || bs) false list;
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# Find the sole element in the list matching the specified
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# predicate, returns `default' if no such element exists, or
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# `multiple' if there are multiple matching elements.
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findSingle = pred: default: multiple: list:
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let found = filter pred list;
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in if found == [] then default
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else if tail found != [] then multiple
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else head found;
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# Return true if each element of a list is equal, false otherwise.
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eqLists = xs: ys:
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if xs == [] && ys == [] then true
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else if xs == [] || ys == [] then false
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else head xs == head ys && eqLists (tail xs) (tail ys);
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# Workaround, but works in stable Nix now.
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eqStrings = a: b: (a+(substring 0 0 b)) == ((substring 0 0 a)+b);
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# Determine whether a filename ends in the given suffix.
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hasSuffix = ext: fileName:
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let lenFileName = stringLength fileName;
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lenExt = stringLength ext;
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in !(lessThan lenFileName lenExt) &&
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substring (sub lenFileName lenExt) lenFileName fileName == ext;
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hasSuffixHack = a: b: hasSuffix (a+(substring 0 0 b)) ((substring 0 0 a)+b);
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# Bring in a path as a source, filtering out all Subversion and CVS
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# directories, as well as backup files (*~).
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cleanSource =
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let filter = name: type: let baseName = baseNameOf (toString name); in ! (
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# Filter out Subversion and CVS directories.
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(type == "directory" && (name == ".svn" || name == "CVS")) ||
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# Filter out backup files.
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(hasSuffix "~" name)
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);
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in src: builtins.filterSource filter src;
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# Return a singleton list or an empty list, depending on a boolean
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# value. Useful when building lists with optional elements
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# (e.g. `++ optional (system == "i686-linux") flashplayer').
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optional = cond: elem: if cond then [elem] else [];
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# Return a list of integers from `first' up to and including `last'.
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range = first: last:
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if builtins.lessThan last first
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then []
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else [first] ++ range (builtins.add first 1) last;
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# Return true only if there is an attribute and it is true.
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checkFlag = attrSet: name:
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if (name == "true") then true else
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if (name == "false") then false else
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if (isInList (getAttr ["flags"] [] attrSet) name) then true else
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getAttr [name] false attrSet ;
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logicalOR = x: y: x || y;
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logicalAND = x: y: x && y;
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# Input : attrSet, [ [name default] ... ], name
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# Output : its value or default.
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getValue = attrSet: argList: name:
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( getAttr [name] (if checkFlag attrSet name then true else
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if argList == [] then null else
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let x = builtins.head argList; in
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if (head x) == name then
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(head (tail x))
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else (getValue attrSet
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(tail argList) name)) attrSet );
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# Input : attrSet, [[name default] ...], [ [flagname reqs..] ... ]
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# Output : are reqs satisfied? It's asserted.
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checkReqs = attrSet : argList : condList :
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(
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fold logicalAND true
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(map (x: let name = (head x) ; in
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((checkFlag attrSet name) ->
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(fold logicalAND true
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(map (y: let val=(getValue attrSet argList y); in
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(val!=null) && (val!=false))
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(tail x))))) condList)) ;
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isInList = list: x:
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if (list == []) then false else
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if (x == (head list)) then true else
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isInList (tail list) x;
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uniqList = {inputList, outputList ? []}:
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if (inputList == []) then outputList else
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let x=head inputList;
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newOutputList = outputList ++
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(if (isInList outputList x) then [] else [x]);
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in uniqList {outputList=newOutputList;
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inputList = (tail inputList);};
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condConcat = name: list: checker:
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if list == [] then name else
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if checker (head list) then
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condConcat
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(name + (head (tail list)))
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(tail (tail list))
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checker
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else condConcat
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name (tail (tail list)) checker;
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/* Options. */
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mkOption = attrs: attrs // {_type = "option";};
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typeOf = x: if x ? _type then x._type else "";
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fillOptionsDefaults = defs: opts: opts //
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builtins.listToAttrs (map (defName:
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{ name = defName;
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value =
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let
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defValue = builtins.getAttr defName defs;
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optValue = builtins.getAttr defName opts;
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in
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if typeOf defValue == "option"
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then
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# `defValue' is an option.
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if builtins.hasAttr defName opts
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then builtins.getAttr defName opts
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else defValue.default
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else
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# `defValue' is an attribute set containing options.
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# So recurse.
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if builtins.hasAttr defName opts && builtins.isAttrs optValue
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then fillOptionsDefaults defValue optValue
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else fillOptionsDefaults defValue {};
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}
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) (builtins.attrNames defs));
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}
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