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https://github.com/NixOS/nixpkgs.git
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943592f698
Among other things, this will allow *2nix tools to output plain data while still being composable with the traditional callPackage/.override interfaces.
394 lines
16 KiB
Nix
394 lines
16 KiB
Nix
{ lib }:
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let
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inherit (builtins) head tail isList isAttrs isInt attrNames;
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in
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with lib.lists;
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with lib.attrsets;
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with lib.strings;
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rec {
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# returns default if env var is not set
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maybeEnv = name: default:
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let value = builtins.getEnv name; in
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if value == "" then default else value;
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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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foldArgs = merger: f: init: x:
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let arg = (merger init (defaultMergeArg init x));
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# now add the function with composed args already applied to the final attrs
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base = (setAttrMerge "passthru" {} (f arg)
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( z: z // rec {
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function = foldArgs merger f arg;
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args = (lib.attrByPath ["passthru" "args"] {} z) // x;
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} ));
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withStdOverrides = base // {
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override = base.passthru.function;
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};
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in
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withStdOverrides;
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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 lib.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 = args.${n};
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in if isAttrs x then (mergeFun args x)
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else assert lib.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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# shortcut for attrByPath ["name"] default attrs
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maybeAttrNullable = maybeAttr;
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# shortcut for attrByPath ["name"] default attrs
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maybeAttr = name: default: attrs: attrs.${name} or 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 (attrByPath ["flags"] [] attrSet)) then true else
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attrByPath [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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( attrByPath [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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# This function has O(n^2) performance.
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uniqList = { inputList, acc ? [] }:
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let go = xs: acc:
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if xs == []
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then []
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else let x = head xs;
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y = if elem x acc then [] else [x];
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in y ++ go (tail xs) (y ++ acc);
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in go inputList acc;
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uniqListExt = { inputList,
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outputList ? [],
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getter ? (x: x),
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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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lazyGenericClosure = {startSet, operator}:
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let
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work = list: doneKeys: result:
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if list == [] then
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result
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else
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let x = head list; key = x.key; in
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if elem key doneKeys then
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work (tail list) doneKeys result
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else
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work (tail list ++ operator x) ([key] ++ doneKeys) ([x] ++ result);
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in
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work startSet [] [];
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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 = acc: xs:
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if xs == []
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then acc
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else let y = head xs;
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ys = tail xs;
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in if ! isAttrs y
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then innerClosePropagation acc ys
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else let acc' = [y] ++ acc;
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in innerClosePropagation
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acc'
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(uniqList { inputList = (maybeAttrNullable "propagatedBuildInputs" [] y)
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++ (maybeAttrNullable "propagatedNativeBuildInputs" [] y)
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++ ys;
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acc = acc';
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}
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);
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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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mapAttrsFlatten = f: r: map (attr: f attr r.${attr}) (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 set ? ${n}
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then setAttr set n (f set.${n} set2.${n})
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else set )
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(set2 // 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 exists 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 doesn't 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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# ! deprecated, 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 set ? ${n}
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then # merge
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if elem n mergeLists # attribute contains list, merge them by concatenating
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then attrs2.${n} ++ attrs1.${n}
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else if elem n overrideSnd
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then attrs1.${n}
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else throw "error mergeAttrsNoOverride, attribute ${n} given in both attributes - no merge func defined"
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else attrs2.${n} # 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 x ? ${a}
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then if y ? ${a}
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then v x.${a} y.${a} # both have attr, use merge func
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else x.${a} # only x has attr
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else y.${a} # 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: ! x ? ${a} && ! y ? ${a})
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(attrNames mergeAttrBy2))
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)
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)
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];
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mergeAttrsByFuncDefaults = foldl mergeAttrByFunc { inherit mergeAttrBy; };
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mergeAttrsByFuncDefaultsClean = list: removeAttrs (mergeAttrsByFuncDefaults list) ["mergeAttrBy"];
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# sane defaults (same name as attr name so that inherit can be used)
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mergeAttrBy = # { buildInputs = concatList; [...]; passthru = mergeAttr; [..]; }
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listToAttrs (map (n: nameValuePair n lib.concat)
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[ "nativeBuildInputs" "buildInputs" "propagatedBuildInputs" "configureFlags" "prePhases" "postAll" "patches" ])
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// listToAttrs (map (n: nameValuePair n lib.mergeAttrs) [ "passthru" "meta" "cfg" "flags" ])
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// listToAttrs (map (n: nameValuePair n (a: b: "${a}\n${b}") ) [ "preConfigure" "postInstall" ])
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;
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# prepareDerivationArgs tries to make writing configurable derivations easier
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# example:
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# prepareDerivationArgs {
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# mergeAttrBy = {
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# myScript = x: y: x ++ "\n" ++ y;
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# };
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# cfg = {
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# readlineSupport = true;
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# };
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# flags = {
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# readline = {
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# set = {
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# configureFlags = [ "--with-compiler=${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: "${name}Support";
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cfgWithDefaults = (listToAttrs (map (n: nameValuePair (flagName n) false) (attrNames args2.flags)))
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// args2.cfg;
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opts = attrValues (mapAttrs (a: v:
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let v2 = if v ? set || v ? unset then v else { set = v; };
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n = if cfgWithDefaults.${flagName a} 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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nixType = x:
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if isAttrs x then
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if x ? outPath then "derivation"
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else "attrs"
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else if lib.isFunction x then "function"
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else if isList x then "list"
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else if x == true then "bool"
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else if x == false then "bool"
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else if x == null then "null"
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else if isInt x then "int"
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else "string";
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/* deprecated:
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For historical reasons, imap has an index starting at 1.
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But for consistency with the rest of the library we want an index
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starting at zero.
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*/
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imap = imap1;
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}
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