mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-27 16:11:58 +00:00
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
|
|
|
|
with import ./lists.nix;
|
|
with import ./attrsets.nix;
|
|
with import ./strings.nix;
|
|
|
|
rec {
|
|
|
|
|
|
# accumulates / merges all attr sets until null is fed.
|
|
# example: sumArgs id { a = 'a'; x = 'x'; } { y = 'y'; x = 'X'; } null
|
|
# result : { a = 'a'; x = 'X'; y = 'Y'; }
|
|
innerSumArgs = f : x : y : (if y == null then (f x)
|
|
else (innerSumArgs f (x // y)));
|
|
sumArgs = f : innerSumArgs f {};
|
|
|
|
# Advanced sumArgs version. Hm, twice as slow, I'm afraid.
|
|
# composedArgs id (x:x//{a="b";}) (x:x//{b=x.a + "c";}) null;
|
|
# {a="b" ; b="bc";};
|
|
innerComposedArgs = f : x : y : (if y==null then (f x)
|
|
else (if (builtins.isAttrs y) then
|
|
(innerComposedArgs f (x//y))
|
|
else (innerComposedArgs f (y x))));
|
|
composedArgs = f: innerComposedArgs f {};
|
|
|
|
defaultMergeArg = x : y: if builtins.isAttrs y then
|
|
y
|
|
else
|
|
(y x);
|
|
defaultMerge = x: y: x // (defaultMergeArg x y);
|
|
sumTwoArgs = f: x: y:
|
|
f (defaultMerge x y);
|
|
foldArgs = merger: f: init: x:
|
|
let arg=(merger init (defaultMergeArg init x)); in
|
|
# now add the function with composed args already applied to the final attrs
|
|
setAttrMerge "passthru" {} (f arg) ( x : x // { function = foldArgs merger f arg; } );
|
|
|
|
# predecessors: proposed replacement for applyAndFun (which has a bug cause it merges twice)
|
|
# the naming "overridableDelayableArgs" tries to express that you can
|
|
# - override attr values which have been supplied earlier
|
|
# - use attr values before they have been supplied by accessing the fix point
|
|
# name "fixed"
|
|
# f: the (delayed overridden) arguments are applied to this
|
|
#
|
|
# initial: initial attrs arguments and settings. see defaultOverridableDelayableArgs
|
|
#
|
|
# returns: f applied to the arguments // special attributes attrs
|
|
# a) merge: merge applied args with new args. Wether an argument is overridden depends on the merge settings
|
|
# b) replace: this let's you replace and remove names no matter which merge function has been set
|
|
#
|
|
# examples: see test cases "res" below;
|
|
overridableDelayableArgs =
|
|
f : # the function applied to the arguments
|
|
initial : # you pass attrs, the functions below are passing a function taking the fix argument
|
|
let
|
|
takeFixed = if (__isFunction initial) then initial else (fixed : initial); # transform initial to an expression always taking the fixed argument
|
|
tidy = args :
|
|
let # apply all functions given in "applyPreTidy" in sequence
|
|
applyPreTidyFun = fold ( n : a : x : n ( a x ) ) lib.id (maybeAttr "applyPreTidy" [] args);
|
|
in removeAttrs (applyPreTidyFun args) ( ["applyPreTidy"] ++ (maybeAttr "removeAttrs" [] args) ); # tidy up args before applying them
|
|
fun = n : x :
|
|
let newArgs = fixed :
|
|
let args = takeFixed fixed;
|
|
mergeFun = __getAttr n args;
|
|
in if __isAttrs x then (mergeFun args x)
|
|
else assert __isFunction x;
|
|
mergeFun args (x ( args // { inherit fixed; }));
|
|
in overridableDelayableArgs f newArgs;
|
|
in
|
|
(f (tidy (lib.fix takeFixed))) // {
|
|
merge = fun "mergeFun";
|
|
replace = fun "keepFun";
|
|
};
|
|
defaultOverridableDelayableArgs = f :
|
|
let defaults = {
|
|
mergeFun = mergeAttrByFunc; # default merge function. merge strategie (concatenate lists, strings) is given by mergeAttrBy
|
|
keepFun = a : b : { inherit (a) removeAttrs mergeFun keepFun mergeAttrBy; } // b; # even when using replace preserve these values
|
|
applyPreTidy = []; # list of functions applied to args before args are tidied up (usage case : prepareDerivationArgs)
|
|
mergeAttrBy = mergeAttrBy // {
|
|
applyPreTidy = a : b : a ++ b;
|
|
removeAttrs = a : b: a ++ b;
|
|
};
|
|
removeAttrs = ["mergeFun" "keepFun" "mergeAttrBy" "removeAttrs" "fixed" ]; # before applying the arguments to the function make sure these names are gone
|
|
};
|
|
in (overridableDelayableArgs f defaults).merge;
|
|
|
|
|
|
|
|
# rec { # an example of how composedArgsAndFun can be used
|
|
# a = composedArgsAndFun (x : x) { a = ["2"]; meta = { d = "bar";}; };
|
|
# # meta.d will be lost ! It's your task to preserve it (eg using a merge function)
|
|
# b = a.passthru.function { a = [ "3" ]; meta = { d2 = "bar2";}; };
|
|
# # instead of passing/ overriding values you can use a merge function:
|
|
# c = b.passthru.function ( x: { a = x.a ++ ["4"]; }); # consider using (maybeAttr "a" [] x)
|
|
# }
|
|
# result:
|
|
# {
|
|
# a = { a = ["2"]; meta = { d = "bar"; }; passthru = { function = .. }; };
|
|
# b = { a = ["3"]; meta = { d2 = "bar2"; }; passthru = { function = .. }; };
|
|
# c = { a = ["3" "4"]; meta = { d2 = "bar2"; }; passthru = { function = .. }; };
|
|
# # c2 is equal to c
|
|
# }
|
|
composedArgsAndFun = f: foldArgs defaultMerge f {};
|
|
|
|
# example a = pairMap (x : y : x + y) ["a" "b" "c" "d"];
|
|
# result: ["ab" "cd"]
|
|
innerPairMap = acc: f: l:
|
|
if l == [] then acc else
|
|
innerPairMap (acc ++ [(f (head l)(head (tail l)))])
|
|
f (tail (tail l));
|
|
pairMap = innerPairMap [];
|
|
|
|
|
|
# shortcut for getAttr ["name"] default attrs
|
|
maybeAttr = name: default: attrs:
|
|
if (__hasAttr name attrs) then (__getAttr name attrs) else default;
|
|
|
|
|
|
# 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 (val == true || val == false) then false
|
|
else null;
|
|
|
|
|
|
# Return true only if there is an attribute and it is true.
|
|
checkFlag = attrSet: name:
|
|
if (name == "true") then true else
|
|
if (name == "false") then false else
|
|
if (elem name (getAttr ["flags"] [] attrSet)) then true else
|
|
getAttr [name] false attrSet ;
|
|
|
|
|
|
# Input : attrSet, [ [name default] ... ], name
|
|
# Output : its value or default.
|
|
getValue = attrSet: argList: name:
|
|
( getAttr [name] (if checkFlag attrSet name then true else
|
|
if argList == [] then null else
|
|
let x = builtins.head argList; in
|
|
if (head x) == name then
|
|
(head (tail x))
|
|
else (getValue attrSet
|
|
(tail argList) name)) attrSet );
|
|
|
|
|
|
# Input : attrSet, [[name default] ...], [ [flagname reqs..] ... ]
|
|
# Output : are reqs satisfied? It's asserted.
|
|
checkReqs = attrSet : argList : condList :
|
|
(
|
|
fold lib.and true
|
|
(map (x: let name = (head x) ; in
|
|
|
|
((checkFlag attrSet name) ->
|
|
(fold lib.and true
|
|
(map (y: let val=(getValue attrSet argList y); in
|
|
(val!=null) && (val!=false))
|
|
(tail x))))) condList)) ;
|
|
|
|
|
|
uniqList = {inputList, outputList ? []}:
|
|
if (inputList == []) then outputList else
|
|
let x=head inputList;
|
|
newOutputList = outputList ++
|
|
(if elem x outputList then [] else [x]);
|
|
in uniqList {outputList=newOutputList;
|
|
inputList = (tail inputList);};
|
|
|
|
uniqListExt = {inputList, outputList ? [],
|
|
getter ? (x : x), compare ? (x: y: x==y)}:
|
|
if (inputList == []) then outputList else
|
|
let x=head inputList;
|
|
isX = y: (compare (getter y) (getter x));
|
|
newOutputList = outputList ++
|
|
(if any isX outputList then [] else [x]);
|
|
in uniqListExt {outputList=newOutputList;
|
|
inputList = (tail inputList);
|
|
inherit getter compare;
|
|
};
|
|
|
|
|
|
|
|
condConcat = name: list: checker:
|
|
if list == [] then name else
|
|
if checker (head list) then
|
|
condConcat
|
|
(name + (head (tail list)))
|
|
(tail (tail list))
|
|
checker
|
|
else condConcat
|
|
name (tail (tail list)) checker;
|
|
|
|
# Merge sets of attributes and use the function f to merge
|
|
# attributes values.
|
|
zip = f: sets:
|
|
builtins.listToAttrs (map (name: {
|
|
inherit name;
|
|
value =
|
|
f name
|
|
(map (__getAttr name)
|
|
(filter (__hasAttr name) sets));
|
|
}) (concatMap builtins.attrNames sets));
|
|
|
|
# flatten a list of elements by following the properties of the elements.
|
|
# next : return the list of following elements.
|
|
# seen : lists of elements already visited.
|
|
# default: result if 'x' is empty.
|
|
# x : list of values that have to be processed.
|
|
uniqFlatten = next: seen: default: x:
|
|
if x == []
|
|
then default
|
|
else
|
|
let h = head x; t = tail x; n = next h; in
|
|
if elem h seen
|
|
then uniqFlatten next seen default t
|
|
else uniqFlatten next (seen ++ [h]) (default ++ [h]) (n ++ t)
|
|
;
|
|
|
|
innerModifySumArgs = f: x: a: b: if b == null then (f a b) // x else
|
|
innerModifySumArgs f x (a // b);
|
|
modifySumArgs = f: x: innerModifySumArgs f x {};
|
|
|
|
|
|
innerClosePropagation = ready: list: if list == [] then ready else
|
|
if (head list) ? propagatedBuildInputs then
|
|
innerClosePropagation (ready ++ [(head list)])
|
|
((head list).propagatedBuildInputs ++ (tail list)) else
|
|
innerClosePropagation (ready ++ [(head list)]) (tail list);
|
|
|
|
closePropagation = list: (uniqList {inputList = (innerClosePropagation [] list);});
|
|
|
|
# calls a function (f attr value ) for each record item. returns a list
|
|
# should be renamed to mapAttrsFlatten
|
|
mapRecordFlatten = f : r : map (attr: f attr (builtins.getAttr attr r) ) (attrNames r);
|
|
|
|
# attribute set containing one attribute
|
|
nvs = name : value : listToAttrs [ (nameValuePair name value) ];
|
|
# adds / replaces an attribute of an attribute set
|
|
setAttr = set : name : v : set // (nvs name v);
|
|
|
|
# setAttrMerge (similar to mergeAttrsWithFunc but only merges the values of a particular name)
|
|
# setAttrMerge "a" [] { a = [2];} (x : x ++ [3]) -> { a = [2 3]; }
|
|
# setAttrMerge "a" [] { } (x : x ++ [3]) -> { a = [ 3]; }
|
|
setAttrMerge = name : default : attrs : f :
|
|
setAttr attrs name (f (maybeAttr name default attrs));
|
|
|
|
# Using f = a : b = b the result is similar to //
|
|
# merge attributes with custom function handling the case that the attribute
|
|
# exists in both sets
|
|
mergeAttrsWithFunc = f : set1 : set2 :
|
|
fold (n: set : if (__hasAttr n set)
|
|
then setAttr set n (f (__getAttr n set) (__getAttr n set2))
|
|
else set )
|
|
set1 (__attrNames set2);
|
|
|
|
# merging two attribute set concatenating the values of same attribute names
|
|
# eg { a = 7; } { a = [ 2 3 ]; } becomes { a = [ 7 2 3 ]; }
|
|
mergeAttrsConcatenateValues = mergeAttrsWithFunc ( a : b : (toList a) ++ (toList b) );
|
|
|
|
# merges attributes using //, if a name exisits in both attributes
|
|
# an error will be triggered unless its listed in mergeLists
|
|
# so you can mergeAttrsNoOverride { buildInputs = [a]; } { buildInputs = [a]; } {} to get
|
|
# { buildInputs = [a b]; }
|
|
# merging buildPhase does'nt really make sense. The cases will be rare where appending /prefixing will fit your needs?
|
|
# in these cases the first buildPhase will override the second one
|
|
# ! depreceated, use mergeAttrByFunc instead
|
|
mergeAttrsNoOverride = { mergeLists ? ["buildInputs" "propagatedBuildInputs"],
|
|
overrideSnd ? [ "buildPhase" ]
|
|
} : attrs1 : attrs2 :
|
|
fold (n: set :
|
|
setAttr set n ( if (__hasAttr n set)
|
|
then # merge
|
|
if elem n mergeLists # attribute contains list, merge them by concatenating
|
|
then (__getAttr n attrs2) ++ (__getAttr n attrs1)
|
|
else if elem n overrideSnd
|
|
then __getAttr n attrs1
|
|
else throw "error mergeAttrsNoOverride, attribute ${n} given in both attributes - no merge func defined"
|
|
else __getAttr n attrs2 # add attribute not existing in attr1
|
|
)) attrs1 (__attrNames attrs2);
|
|
|
|
|
|
# example usage:
|
|
# mergeAttrByFunc {
|
|
# inherit mergeAttrBy; # defined below
|
|
# buildInputs = [ a b ];
|
|
# } {
|
|
# buildInputs = [ c d ];
|
|
# };
|
|
# will result in
|
|
# { mergeAttrsBy = [...]; buildInputs = [ a b c d ]; }
|
|
# is used by prepareDerivationArgs, defaultOverridableDelayableArgs and can be used when composing using
|
|
# foldArgs, composedArgsAndFun or applyAndFun. Example: composableDerivation in all-packages.nix
|
|
mergeAttrByFunc = x : y :
|
|
let
|
|
mergeAttrBy2 = { mergeAttrBy=lib.mergeAttrs; }
|
|
// (maybeAttr "mergeAttrBy" {} x)
|
|
// (maybeAttr "mergeAttrBy" {} y); in
|
|
fold lib.mergeAttrs {} [
|
|
x y
|
|
(mapAttrs ( a : v : # merge special names using given functions
|
|
if (__hasAttr a x)
|
|
then if (__hasAttr a y)
|
|
then v (__getAttr a x) (__getAttr a y) # both have attr, use merge func
|
|
else (__getAttr a x) # only x has attr
|
|
else (__getAttr a y) # only y has attr)
|
|
) (removeAttrs mergeAttrBy2
|
|
# don't merge attrs which are neither in x nor y
|
|
(filter (a : (! __hasAttr a x) && (! __hasAttr a y) )
|
|
(__attrNames mergeAttrBy2))
|
|
)
|
|
)
|
|
];
|
|
mergeAttrsByFuncDefaults = foldl mergeAttrByFunc { inherit mergeAttrBy; };
|
|
# sane defaults (same name as attr name so that inherit can be used)
|
|
mergeAttrBy = # { buildInputs = concatList; [...]; passthru = mergeAttr; [..]; }
|
|
listToAttrs (map (n : nameValuePair n lib.concat) [ "buildInputs" "propagatedBuildInputs" "configureFlags" "prePhases" "postAll" ])
|
|
// listToAttrs (map (n : nameValuePair n lib.mergeAttrs) [ "passthru" "meta" "cfg" "flags" ]);
|
|
|
|
# returns atribute values as a list
|
|
flattenAttrs = set : map ( attr : builtins.getAttr attr set) (attrNames set);
|
|
mapIf = cond : f : fold ( x : l : if (cond x) then [(f x)] ++ l else l) [];
|
|
|
|
# pick attrs subset_attr_names and apply f
|
|
subsetmap = f : attrs : subset_attr_names :
|
|
listToAttrs (fold ( attr : r : if __hasAttr attr attrs
|
|
then r ++ [ ( nameValuePair attr ( f (__getAttr attr attrs) ) ) ] else r ) []
|
|
subset_attr_names );
|
|
|
|
# prepareDerivationArgs tries to make writing configurable derivations easier
|
|
# example:
|
|
# prepareDerivationArgs {
|
|
# mergeAttrBy = {
|
|
# myScript = x : y : x ++ "\n" ++ y;
|
|
# };
|
|
# cfg = {
|
|
# readlineSupport = true;
|
|
# };
|
|
# flags = {
|
|
# readline = {
|
|
# set = {
|
|
# configureFlags = [ "--with-compiler=${compiler}" ];
|
|
# buildInputs = [ compiler ];
|
|
# pass = { inherit compiler; READLINE=1; };
|
|
# assertion = compiler.dllSupport;
|
|
# myScript = "foo";
|
|
# };
|
|
# unset = { configureFlags = ["--without-compiler"]; };
|
|
# };
|
|
# };
|
|
# src = ...
|
|
# buildPhase = '' ... '';
|
|
# name = ...
|
|
# myScript = "bar";
|
|
# };
|
|
# if you don't have need for unset you can omit the surrounding set = { .. } attr
|
|
# all attrs except flags cfg and mergeAttrBy will be merged with the
|
|
# additional data from flags depending on config settings
|
|
# It's used in composableDerivation in all-packages.nix. It's also used
|
|
# heavily in the new python and libs implementation
|
|
#
|
|
# should we check for misspelled cfg options?
|
|
# TODO use args.mergeFun here as well?
|
|
prepareDerivationArgs = args:
|
|
let args2 = { cfg = {}; flags = {}; } // args;
|
|
flagName = name : "${name}Support";
|
|
cfgWithDefaults = (listToAttrs (map (n : nameValuePair (flagName n) false) (attrNames args2.flags)))
|
|
// args2.cfg;
|
|
opts = flattenAttrs (mapAttrs (a : v :
|
|
let v2 = if (v ? set || v ? unset) then v else { set = v; };
|
|
n = if (__getAttr (flagName a) cfgWithDefaults) then "set" else "unset";
|
|
attr = maybeAttr n {} v2; in
|
|
if (maybeAttr "assertion" true attr)
|
|
then attr
|
|
else throw "assertion of flag ${a} of derivation ${args.name} failed"
|
|
) args2.flags );
|
|
in removeAttrs
|
|
(mergeAttrsByFuncDefaults ([args] ++ opts ++ [{ passthru = cfgWithDefaults; }]))
|
|
["flags" "cfg" "mergeAttrBy" ];
|
|
|
|
|
|
# deep, strict equality testing. This should be implemented as primop
|
|
eqStrict = a : b :
|
|
let eqListStrict = a : b :
|
|
if (a == []) != (b == []) then false
|
|
else if a == [] then true
|
|
else eqStrict (__head a) (__head b) && eqListStrict (__tail a) (__tail b);
|
|
in
|
|
if __isList a && __isList b then eqListStrict a b
|
|
else if __isAttrs a && isAttrs b then
|
|
(eqListStrict (__attrNames a) (__attrNames b))
|
|
&& (eqListStrict (lib.attrValues a) (lib.attrValues b))
|
|
else a == b; # FIXME !
|
|
}
|