mirror of
https://github.com/NixOS/nixpkgs.git
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b53ef57554
* Added a function mapAttrsRecursive, which is like mapAttrs, but recursively applies itself to attribute sets. * Commented and cleaned up some functions. svn path=/nixpkgs/trunk/; revision=14495
397 lines
16 KiB
Nix
397 lines
16 KiB
Nix
let lib = import ./default.nix; in
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with import ./lists.nix;
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with import ./attrsets.nix;
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with import ./strings.nix;
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rec {
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# accumulates / merges all attr sets until null is fed.
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# example: sumArgs id { a = 'a'; x = 'x'; } { y = 'y'; x = 'X'; } null
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# result : { a = 'a'; x = 'X'; y = 'Y'; }
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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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# Advanced sumArgs version. Hm, twice as slow, I'm afraid.
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# composedArgs id (x:x//{a="b";}) (x:x//{b=x.a + "c";}) null;
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# {a="b" ; b="bc";};
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innerComposedArgs = f : x : y : (if y==null then (f x)
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else (if (builtins.isAttrs y) then
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(innerComposedArgs f (x//y))
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else (innerComposedArgs f (y x))));
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composedArgs = f: innerComposedArgs f {};
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defaultMergeArg = x : y: if builtins.isAttrs y then
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y
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else
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(y x);
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defaultMerge = x: y: x // (defaultMergeArg x y);
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sumTwoArgs = f: x: y:
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f (defaultMerge x y);
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foldArgs = merger: f: init: x:
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let arg=(merger init (defaultMergeArg init x)); in
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# now add the function with composed args already applied to the final attrs
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setAttrMerge "passthru" {} (f arg) ( x : x // { function = foldArgs merger f arg; } );
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# predecessors: proposed replacement for applyAndFun (which has a bug cause it merges twice)
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# the naming "overridableDelayableArgs" tries to express that you can
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# - override attr values which have been supplied earlier
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# - use attr values before they have been supplied by accessing the fix point
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# name "fixed"
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# f: the (delayed overridden) arguments are applied to this
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#
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# initial: initial attrs arguments and settings. see defaultOverridableDelayableArgs
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#
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# returns: f applied to the arguments // special attributes attrs
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# a) merge: merge applied args with new args. Wether an argument is overridden depends on the merge settings
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# b) replace: this let's you replace and remove names no matter which merge function has been set
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#
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# examples: see test cases "res" below;
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overridableDelayableArgs =
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f : # the function applied to the arguments
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initial : # you pass attrs, the functions below are passing a function taking the fix argument
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let
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takeFixed = if (__isFunction initial) then initial else (fixed : initial); # transform initial to an expression always taking the fixed argument
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tidy = args :
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let # apply all functions given in "applyPreTidy" in sequence
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applyPreTidyFun = fold ( n : a : x : n ( a x ) ) lib.id (maybeAttr "applyPreTidy" [] args);
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in removeAttrs (applyPreTidyFun args) ( ["applyPreTidy"] ++ (maybeAttr "removeAttrs" [] args) ); # tidy up args before applying them
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fun = n : x :
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let newArgs = fixed :
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let args = takeFixed fixed;
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mergeFun = __getAttr n args;
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in if __isAttrs x then (mergeFun args x)
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else assert __isFunction x;
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mergeFun args (x ( args // { inherit fixed; }));
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in overridableDelayableArgs f newArgs;
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in
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(f (tidy (lib.fix takeFixed))) // {
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merge = fun "mergeFun";
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replace = fun "keepFun";
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};
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defaultOverridableDelayableArgs = f :
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let defaults = {
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mergeFun = mergeAttrByFunc; # default merge function. merge strategie (concatenate lists, strings) is given by mergeAttrBy
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keepFun = a : b : { inherit (a) removeAttrs mergeFun keepFun mergeAttrBy; } // b; # even when using replace preserve these values
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applyPreTidy = []; # list of functions applied to args before args are tidied up (usage case : prepareDerivationArgs)
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mergeAttrBy = mergeAttrBy // {
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applyPreTidy = a : b : a ++ b;
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removeAttrs = a : b: a ++ b;
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};
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removeAttrs = ["mergeFun" "keepFun" "mergeAttrBy" "removeAttrs" "fixed" ]; # before applying the arguments to the function make sure these names are gone
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};
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in (overridableDelayableArgs f defaults).merge;
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# rec { # an example of how composedArgsAndFun can be used
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# a = composedArgsAndFun (x : x) { a = ["2"]; meta = { d = "bar";}; };
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# # meta.d will be lost ! It's your task to preserve it (eg using a merge function)
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# b = a.passthru.function { a = [ "3" ]; meta = { d2 = "bar2";}; };
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# # instead of passing/ overriding values you can use a merge function:
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# c = b.passthru.function ( x: { a = x.a ++ ["4"]; }); # consider using (maybeAttr "a" [] x)
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# }
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# result:
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# {
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# a = { a = ["2"]; meta = { d = "bar"; }; passthru = { function = .. }; };
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# b = { a = ["3"]; meta = { d2 = "bar2"; }; passthru = { function = .. }; };
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# c = { a = ["3" "4"]; meta = { d2 = "bar2"; }; passthru = { function = .. }; };
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# # c2 is equal to c
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# }
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composedArgsAndFun = f: foldArgs defaultMerge f {};
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# example a = pairMap (x : y : x + y) ["a" "b" "c" "d"];
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# result: ["ab" "cd"]
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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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# shortcut for getAttr ["name"] default attrs
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maybeAttr = name: default: attrs:
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if (__hasAttr name attrs) then (__getAttr name attrs) else default;
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# Return the second argument if the first one is true or the empty version
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# of the second argument.
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ifEnable = cond: val:
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if cond then val
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else if builtins.isList val then []
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else if builtins.isAttrs val then {}
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# else if builtins.isString val then ""
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else if (val == true || val == false) then false
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else null;
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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 (elem name (getAttr ["flags"] [] attrSet)) then true else
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getAttr [name] false attrSet ;
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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 lib.and true
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(map (x: let name = (head x) ; in
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((checkFlag attrSet name) ->
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(fold lib.and 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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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 elem x outputList then [] else [x]);
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in uniqList {outputList=newOutputList;
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inputList = (tail inputList);};
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uniqListExt = {inputList, outputList ? [],
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getter ? (x : x), compare ? (x: y: x==y)}:
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if (inputList == []) then outputList else
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let x=head inputList;
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isX = y: (compare (getter y) (getter x));
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newOutputList = outputList ++
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(if any isX outputList then [] else [x]);
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in uniqListExt {outputList=newOutputList;
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inputList = (tail inputList);
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inherit getter compare;
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};
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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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# Merge sets of attributes and use the function f to merge
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# attributes values.
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zip = f: sets:
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builtins.listToAttrs (map (name: {
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inherit name;
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value =
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f name
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(map (__getAttr name)
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(filter (__hasAttr name) sets));
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}) (concatMap builtins.attrNames sets));
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# flatten a list of elements by following the properties of the elements.
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# next : return the list of following elements.
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# seen : lists of elements already visited.
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# default: result if 'x' is empty.
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# x : list of values that have to be processed.
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uniqFlatten = next: seen: default: x:
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if x == []
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then default
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else
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let h = head x; t = tail x; n = next h; in
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if elem h seen
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then uniqFlatten next seen default t
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else uniqFlatten next (seen ++ [h]) (default ++ [h]) (n ++ t)
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;
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innerModifySumArgs = f: x: a: b: if b == null then (f a b) // x else
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innerModifySumArgs f x (a // b);
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modifySumArgs = f: x: innerModifySumArgs f x {};
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innerClosePropagation = ready: list: if list == [] then ready else
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if (head list) ? propagatedBuildInputs then
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innerClosePropagation (ready ++ [(head list)])
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((head list).propagatedBuildInputs ++ (tail list)) else
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innerClosePropagation (ready ++ [(head list)]) (tail list);
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closePropagation = list: (uniqList {inputList = (innerClosePropagation [] list);});
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# calls a function (f attr value ) for each record item. returns a list
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# should be renamed to mapAttrsFlatten
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mapRecordFlatten = f : r : map (attr: f attr (builtins.getAttr attr r) ) (attrNames r);
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# attribute set containing one attribute
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nvs = name : value : listToAttrs [ (nameValuePair name value) ];
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# adds / replaces an attribute of an attribute set
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setAttr = set : name : v : set // (nvs name v);
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# setAttrMerge (similar to mergeAttrsWithFunc but only merges the values of a particular name)
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# setAttrMerge "a" [] { a = [2];} (x : x ++ [3]) -> { a = [2 3]; }
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# setAttrMerge "a" [] { } (x : x ++ [3]) -> { a = [ 3]; }
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setAttrMerge = name : default : attrs : f :
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setAttr attrs name (f (maybeAttr name default attrs));
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# Using f = a : b = b the result is similar to //
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# merge attributes with custom function handling the case that the attribute
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# exists in both sets
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mergeAttrsWithFunc = f : set1 : set2 :
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fold (n: set : if (__hasAttr n set)
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then setAttr set n (f (__getAttr n set) (__getAttr n set2))
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else set )
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set1 (__attrNames set2);
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# merging two attribute set concatenating the values of same attribute names
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# eg { a = 7; } { a = [ 2 3 ]; } becomes { a = [ 7 2 3 ]; }
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mergeAttrsConcatenateValues = mergeAttrsWithFunc ( a : b : (toList a) ++ (toList b) );
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# merges attributes using //, if a name exisits in both attributes
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# an error will be triggered unless its listed in mergeLists
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# so you can mergeAttrsNoOverride { buildInputs = [a]; } { buildInputs = [a]; } {} to get
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# { buildInputs = [a b]; }
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# merging buildPhase does'nt really make sense. The cases will be rare where appending /prefixing will fit your needs?
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# in these cases the first buildPhase will override the second one
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# ! depreceated, use mergeAttrByFunc instead
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mergeAttrsNoOverride = { mergeLists ? ["buildInputs" "propagatedBuildInputs"],
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overrideSnd ? [ "buildPhase" ]
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} : attrs1 : attrs2 :
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fold (n: set :
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setAttr set n ( if (__hasAttr n set)
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then # merge
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if elem n mergeLists # attribute contains list, merge them by concatenating
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then (__getAttr n attrs2) ++ (__getAttr n attrs1)
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else if elem n overrideSnd
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then __getAttr n attrs1
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else throw "error mergeAttrsNoOverride, attribute ${n} given in both attributes - no merge func defined"
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else __getAttr n attrs2 # add attribute not existing in attr1
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)) attrs1 (__attrNames attrs2);
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# example usage:
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# mergeAttrByFunc {
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# inherit mergeAttrBy; # defined below
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# buildInputs = [ a b ];
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# } {
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# buildInputs = [ c d ];
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# };
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# will result in
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# { mergeAttrsBy = [...]; buildInputs = [ a b c d ]; }
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# is used by prepareDerivationArgs, defaultOverridableDelayableArgs and can be used when composing using
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# foldArgs, composedArgsAndFun or applyAndFun. Example: composableDerivation in all-packages.nix
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mergeAttrByFunc = x : y :
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let
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mergeAttrBy2 = { mergeAttrBy=lib.mergeAttrs; }
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// (maybeAttr "mergeAttrBy" {} x)
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// (maybeAttr "mergeAttrBy" {} y); in
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fold lib.mergeAttrs {} [
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x y
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(mapAttrs ( a : v : # merge special names using given functions
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if (__hasAttr a x)
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then if (__hasAttr a y)
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then v (__getAttr a x) (__getAttr a y) # both have attr, use merge func
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else (__getAttr a x) # only x has attr
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else (__getAttr a y) # only y has attr)
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) (removeAttrs mergeAttrBy2
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# don't merge attrs which are neither in x nor y
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(filter (a : (! __hasAttr a x) && (! __hasAttr a y) )
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(__attrNames mergeAttrBy2))
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)
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)
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];
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mergeAttrsByFuncDefaults = foldl mergeAttrByFunc { inherit mergeAttrBy; };
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# sane defaults (same name as attr name so that inherit can be used)
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mergeAttrBy = # { buildInputs = concatList; [...]; passthru = mergeAttr; [..]; }
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listToAttrs (map (n : nameValuePair n lib.concat) [ "buildInputs" "propagatedBuildInputs" "configureFlags" "prePhases" "postAll" ])
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// listToAttrs (map (n : nameValuePair n lib.mergeAttrs) [ "passthru" "meta" "cfg" "flags" ]);
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# returns atribute values as a list
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flattenAttrs = set : map ( attr : builtins.getAttr attr set) (attrNames set);
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mapIf = cond : f : fold ( x : l : if (cond x) then [(f x)] ++ l else l) [];
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# pick attrs subset_attr_names and apply f
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subsetmap = f : attrs : subset_attr_names :
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listToAttrs (fold ( attr : r : if __hasAttr attr attrs
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then r ++ [ ( nameValuePair attr ( f (__getAttr attr attrs) ) ) ] else r ) []
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subset_attr_names );
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# prepareDerivationArgs tries to make writing configurable derivations easier
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# example:
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# prepareDerivationArgs {
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# mergeAttrBy = {
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# myScript = x : y : x ++ "\n" ++ y;
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# };
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# cfg = {
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# readlineSupport = true;
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# };
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# flags = {
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# readline = {
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# set = {
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# configureFlags = [ "--with-compiler=${compiler}" ];
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# buildInputs = [ compiler ];
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# pass = { inherit compiler; READLINE=1; };
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# assertion = compiler.dllSupport;
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# myScript = "foo";
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# };
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# unset = { configureFlags = ["--without-compiler"]; };
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# };
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# };
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# src = ...
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# buildPhase = '' ... '';
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# name = ...
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# myScript = "bar";
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# };
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# if you don't have need for unset you can omit the surrounding set = { .. } attr
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# all attrs except flags cfg and mergeAttrBy will be merged with the
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# additional data from flags depending on config settings
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# It's used in composableDerivation in all-packages.nix. It's also used
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# heavily in the new python and libs implementation
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#
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# should we check for misspelled cfg options?
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# TODO use args.mergeFun here as well?
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prepareDerivationArgs = args:
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let args2 = { cfg = {}; flags = {}; } // args;
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flagName = name : "${name}Support";
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cfgWithDefaults = (listToAttrs (map (n : nameValuePair (flagName n) false) (attrNames args2.flags)))
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// args2.cfg;
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opts = flattenAttrs (mapAttrs (a : v :
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let v2 = if (v ? set || v ? unset) then v else { set = v; };
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n = if (__getAttr (flagName a) cfgWithDefaults) then "set" else "unset";
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attr = maybeAttr n {} v2; in
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if (maybeAttr "assertion" true attr)
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then attr
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else throw "assertion of flag ${a} of derivation ${args.name} failed"
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) args2.flags );
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in removeAttrs
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(mergeAttrsByFuncDefaults ([args] ++ opts ++ [{ passthru = cfgWithDefaults; }]))
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["flags" "cfg" "mergeAttrBy" ];
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# deep, strict equality testing. This should be implemented as primop
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eqStrict = a : b :
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let eqListStrict = a : b :
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if (a == []) != (b == []) then false
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else if a == [] then true
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else eqStrict (__head a) (__head b) && eqListStrict (__tail a) (__tail b);
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in
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if __isList a && __isList b then eqListStrict a b
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else if __isAttrs a && isAttrs b then
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(eqListStrict (__attrNames a) (__attrNames b))
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&& (eqListStrict (lib.attrValues a) (lib.attrValues b))
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else a == b; # FIXME !
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}
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