810 lines
30 KiB
Nix
810 lines
30 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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listToAttrs attrNames hasAttr;
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in
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rec {
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listOfListsToAttrs = ll : builtins.listToAttrs (map (l : { name = (head l); value = (head (tail l)); }) ll);
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# Identity function.
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id = x: x;
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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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# returns f x // { passthru.fun = y : f (merge x y); } while preserving other passthru names.
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# example: let ex = applyAndFun (x : removeAttrs x ["fixed"]) (mergeOrApply mergeAttr) {name = 6;};
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# usage1 = ex.passthru.fun { name = 7; }; # result: { name = 7;}
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# usage2 = ex.passthru.fun (a: a // {name = __add a.name 1; }); # result: { a = 7; }
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# fix usage:
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# usage3a = ex.passthru.fun (a: a // {name2 = a.fixed.toBePassed; }); # usage3a will fail because toBePassed is not yet given
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# usage3b usage3a.passthru.fun { toBePassed = "foo";}; # result { name = 7; name2 = "foo"; toBePassed = "foo"; fixed = <this attrs>; }
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applyAndFun = f : merge : x : assert (__isAttrs x || __isFunction x);
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let takeFix = if (__isFunction x) then x else (attr: merge attr x); in
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setAttrMerge "passthru" {} (fix (fixed : f (takeFix {inherit fixed;})))
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( y : y //
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{
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fun = z : applyAndFun f merge (fixed: merge (takeFix fixed) z);
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funMerge = z : applyAndFun f merge (fixed: let e = takeFix fixed; in merge e (merge e z));
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} );
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mergeOrApply = merge : x : y : if (__isFunction y) then y x else merge x y;
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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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# "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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# Haskell's fold
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foldl = op: nul: list:
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if list == []
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then nul
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else fold op (op nul (head list)) (tail list);
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# Concatenate a list of lists.
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concatList = x : y : x ++ y;
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concatLists = fold concatList [];
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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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# Map and concatenate the result.
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concatMap = f: list: concatLists (map f list);
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concatMapStrings = f: list: concatStrings (map f list);
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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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toList = x : if (__isList x) then x else [x];
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concatStringsSep = separator: list:
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concatStrings (intersperse separator list);
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makeLibraryPath = paths: concatStringsSep ":" (map (path: path + "/lib") paths);
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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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# comment: there is also builtins.getAttr ? (is there a better name for this function?)
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getAttr = attrPath: default: e:
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let attr = head attrPath;
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in
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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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# 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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# 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 iff function `pred' returns true for at least element
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# of `list'.
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any = pred: list:
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if list == [] then false
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else if pred (head list) then true
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else any pred (tail list);
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# Return true iff function `pred' returns true for all elements of
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# `list'.
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all = pred: list:
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if list == [] then true
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else if pred (head list) then all pred (tail list)
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else false;
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# much shorter implementations using map and fold (are lazy as well)
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# which ones are better?
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# true if all/ at least one element(s) satisfy f
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# all = f : l : fold logicalAND true (map f l);
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# any = f : l : fold logicalOR false (map f l);
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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" && (baseName == ".svn" || baseName == "CVS")) ||
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# Filter out backup files.
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(hasSuffix "~" baseName)
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);
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in src: builtins.filterSource filter src;
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# Get all files ending with the specified suffices from the given
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# directory. E.g. `sourceFilesBySuffices ./dir [".xml" ".c"]'.
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sourceFilesBySuffices = path: exts:
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let filter = name: type:
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let base = baseNameOf (toString name);
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in type != "directory" && any (ext: hasSuffix ext base) exts;
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in builtins.filterSource filter path;
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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 or an empty list, dependening on a boolean value.
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optionals = cond: elems: if cond then elems else [];
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optionalString = cond: string: if cond then string else "";
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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 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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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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# divide a list in two depending on the evaluation of a predicate.
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partition = pred:
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fold (h: t:
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if pred h
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then { right = [h] ++ t.right; wrong = t.wrong; }
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else { right = t.right; wrong = [h] ++ t.wrong; }
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) { right = []; wrong = []; };
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# Take a function and evaluate it with its own returned value.
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fix = f:
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(rec { result = f result; }).result;
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# flatten a list of elements by following the properties of the elements.
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# key : return the key which correspond to the value.
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# value : return the value inserted in the returned list.
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# next : return the list of following elements.
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# keys : lists of keys already seen.
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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 = prop@{key, value, next, ...}: keys: 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;
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k = key h; v = value h; n = next h;
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in
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if elem k keys
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then uniqFlatten prop keys default t
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else uniqFlatten prop (keys ++ [k]) (default ++ [v]) (n ++ t)
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;
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/* If. ThenElse. Always. */
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# create "if" statement that can be dealyed on sets until a "then-else" or
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# "always" set is reached. When an always set is reached the condition
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# is ignore.
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isIf = attrs: (typeOf attrs) == "if";
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mkIf = condition: thenelse:
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if isIf thenelse then
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mkIf (condition && thenelse.condition) thenelse.thenelse
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else {
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_type = "if";
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inherit condition thenelse;
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};
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isThenElse = attrs: (typeOf attrs) == "then-else";
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mkThenElse = attrs:
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assert attrs ? thenPart && attrs ? elsePart;
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attrs // { _type = "then-else"; };
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isAlways = attrs: (typeOf attrs) == "always";
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mkAlways = value: { inherit value; _type = "always"; };
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pushIf = f: attrs:
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if isIf attrs then pushIf f (
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let val = attrs.thenelse; in
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# evaluate the condition.
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if isThenElse val then
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if attrs.condition then
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val.thenPart
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else
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val.elsePart
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# ignore the condition.
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else if isAlways val then
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val.value
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# otherwise
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else
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f attrs.condition val)
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else
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attrs;
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# take care otherwise you will have to handle this by hand.
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rmIf = pushIf (condition: val: val);
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evalIf = pushIf (condition: val:
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# guess: empty else part.
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ifEnable condition val
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);
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delayIf = pushIf (condition: val:
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# rewrite the condition on sub-attributes.
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mapAttrs (name: mkIf condition) val
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);
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/* Options. */
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mkOption = attrs: attrs // {_type = "option";};
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typeOf = x: if (__isAttrs x && x ? _type) then x._type else "";
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isOption = attrs: (typeOf attrs) == "option";
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addDefaultOptionValues = 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 addDefaultOptionValues defValue optValue
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else addDefaultOptionValues defValue {};
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}
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) (builtins.attrNames defs));
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mergeDefaultOption = name: list:
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if list != [] && tail list == [] then head list
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else if all __isFunction list then x: mergeDefaultOption (map (f: f x) list)
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else if all __isList list then concatLists list
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else if all __isAttrs list then mergeAttrs list
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else if all (x: true == x || false == x) list then fold logicalOR false list
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else if all (x: x == toString x) list then concatStrings list
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else abort "${name}: Cannot merge values.";
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mergeTypedOption = typeName: predicate: merge: name: list:
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if all predicate list then merge list
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else abort "${name}: Expect a ${typeName}.";
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|
|
|
mergeEnableOption = mergeTypedOption "boolean"
|
|
(x: true == x || false == x) (fold logicalOR false);
|
|
|
|
mergeListOption = mergeTypedOption "list"
|
|
__isList concatLists;
|
|
|
|
mergeStringOption = mergeTypedOption "string"
|
|
(x: if builtins ? isString then builtins.isString x else x + "")
|
|
concatStrings;
|
|
|
|
# Merge sets of options and bindings.
|
|
# noOption: function to call if no option is declared.
|
|
mergeOptionSets = noOption: path: opts:
|
|
if all __isAttrs opts then
|
|
zip (attr: opts:
|
|
let
|
|
name = if path == "" then attr else path + "." + attr;
|
|
test = partition isOption opts;
|
|
opt = ({ merge = mergeDefaultOption; apply = id; } // head test.right);
|
|
in
|
|
if test.right == [] then mergeOptionSets noOption name (map delayIf test.wrong)
|
|
else if tail test.right != [] then throw "Multiple options for '${name}'."
|
|
else if test.wrong == [] then opt.apply opt.default
|
|
else opt.apply (opt.merge name (map evalIf test.wrong))
|
|
) opts
|
|
else noOption path opts;
|
|
|
|
# Keep all option declarations and add an attribute "name" inside
|
|
# each option which contains the path that has to be followed to
|
|
# access it.
|
|
filterOptionSets = path: opts:
|
|
if all __isAttrs opts then
|
|
zip (attr: opts:
|
|
let
|
|
name = if path == "" then attr else path + "." + attr;
|
|
test = partition isOption opts;
|
|
in
|
|
if test.right == [] then filterOptionSets name (map delayIf test.wrong)
|
|
else if tail test.right != [] then throw "Multiple options for '${name}'."
|
|
else { inherit name; } // (head test.right)
|
|
) opts
|
|
else {};
|
|
|
|
# Evaluate a list of option sets that would be merged with the
|
|
# function "merge" which expects two arguments. The attribute named
|
|
# "require" is used to imports option declarations and bindings.
|
|
fixOptionSetsFun = merge: pkgs: opts:
|
|
let
|
|
# ignore all conditions that are on require attributes.
|
|
rmRequireIf = conf:
|
|
let conf2 = delayIf conf; in
|
|
if conf2 ? require then
|
|
conf2 // { require = rmIf conf2.require; }
|
|
else
|
|
conf2;
|
|
|
|
# call configuration "files" with one of the existing convention.
|
|
optionSet = config: configFun:
|
|
if __isFunction configFun then
|
|
let result = configFun { inherit pkgs config; }; in
|
|
# {pkgs, config, ...}: {..}
|
|
if builtins.isAttrs result then result
|
|
# pkgs: config: {..}
|
|
else configFun pkgs config
|
|
# {..}
|
|
else configFun;
|
|
|
|
processConfig = config: configFun:
|
|
rmRequireIf (optionSet config configFun);
|
|
|
|
prop = config: rec {
|
|
key = id;
|
|
prepare = x: processConfig config x;
|
|
value = x: removeAttrs (prepare x) ["require"];
|
|
next = x: toList (getAttr ["require"] [] (prepare x));
|
|
};
|
|
in config:
|
|
merge "" (uniqFlatten (prop config) [] [] (toList opts));
|
|
|
|
fixOptionSets = merge: pkgs: opts:
|
|
fix (fixOptionSetsFun merge pkgs opts);
|
|
|
|
optionAttrSetToDocList = (l: attrs:
|
|
(if (getAttr ["_type"] "" attrs) == "option" then
|
|
[({
|
|
#inherit (attrs) description;
|
|
description = if attrs ? description then attrs.description else
|
|
throw ("No description ${toString l} : ${whatis attrs}");
|
|
}
|
|
//(if attrs ? example then {inherit(attrs) example;} else {} )
|
|
//(if attrs ? default then {inherit(attrs) default;} else {} )
|
|
//{name = l;}
|
|
)]
|
|
else (concatLists (map (s: (optionAttrSetToDocList
|
|
(l + (if l=="" then "" else ".") + s) (builtins.getAttr s attrs)))
|
|
(builtins.attrNames attrs)))));
|
|
|
|
innerModifySumArgs = f: x: a: b: if b == null then (f a b) // x else
|
|
innerModifySumArgs f x (a // b);
|
|
modifySumArgs = f: x: innerModifySumArgs f x {};
|
|
|
|
debugVal = if builtins ? trace then x: (builtins.trace x x) else x: x;
|
|
debugXMLVal = if builtins ? trace then x: (builtins.trace (builtins.toXML x) x) else x: x;
|
|
|
|
# this can help debug your code as well - designed to not produce thousands of lines
|
|
traceWhatis = x : __trace (whatis x) x;
|
|
traceMarked = str: x: __trace (str + (whatis x)) x;
|
|
attrNamesToStr = a : concatStringsSep "; " (map (x : "${x}=") (__attrNames a));
|
|
whatis = x :
|
|
if (__isAttrs x) then
|
|
if (x ? outPath) then "x is a derivation, name ${if x ? name then x.name else "<no name>"}, { ${attrNamesToStr x} }"
|
|
else "x is attr set { ${attrNamesToStr x} }"
|
|
else if (__isFunction x) then "x is a function"
|
|
else if (x == []) then "x is an empty list"
|
|
else if (__isList x) then "x is a list, first item is : ${whatis (__head x)}"
|
|
else if (x == true) then "x is boolean true"
|
|
else if (x == false) then "x is boolean false"
|
|
else if (x == null) then "x is null"
|
|
else "x is probably a string starting, starting characters: ${__substring 0 50 x}..";
|
|
# trace the arguments passed to function and its result
|
|
traceCall = n : f : a : let t = n2 : x : traceMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a));
|
|
traceCall2 = n : f : a : b : let t = n2 : x : traceMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b));
|
|
traceCall3 = n : f : a : b : c : let t = n2 : x : traceMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b) (t "arg 3" c));
|
|
|
|
|
|
|
|
innerClosePropagation = ready: list: if list == [] then ready else
|
|
if (head list) ? propagatedBuildInputs then
|
|
innerClosePropagation (ready ++ [(head list)])
|
|
((head list).propagatedBuildInputs ++ (tail list)) else
|
|
innerClosePropagation (ready ++ [(head list)]) (tail list);
|
|
|
|
closePropagation = list: (uniqList {inputList = (innerClosePropagation [] list);});
|
|
|
|
stringToCharacters = s : let l = __stringLength s; in
|
|
if (__lessThan l 1) then [""] else [(__substring 0 1 s)] ++ stringToCharacters (__substring 1 (__sub l 1) s);
|
|
|
|
# should this be implemented as primop ? Yes it should..
|
|
escapeShellArg = s :
|
|
let escapeChar = x : if ( x == "'" ) then "'\"'\"'" else x;
|
|
in "'" + concatStrings (map escapeChar (stringToCharacters s) ) +"'";
|
|
|
|
defineShList = name : list : "\n${name}=(${concatStringsSep " " (map escapeShellArg list)})\n";
|
|
|
|
# this as well :-) arg: http://foo/bar/bz.ext returns bz.ext
|
|
dropPath = s :
|
|
if s == "" then "" else
|
|
let takeTillSlash = left : c : s :
|
|
if left == 0 then s
|
|
else if (__substring left 1 s == "/") then
|
|
(__substring (__add left 1) (__sub c 1) s)
|
|
else takeTillSlash (__sub left 1) (__add c 1) s; in
|
|
takeTillSlash (__sub (__stringLength s) 1) 1 s;
|
|
|
|
# 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);
|
|
|
|
# maps a function on each attr value
|
|
# f = attr : value : ..
|
|
mapAttrs = f : r : listToAttrs ( mapRecordFlatten (a : v : nv a ( f a v ) ) r);
|
|
|
|
# to be used with listToAttrs (_a_ttribute _v_alue)
|
|
nv = name : value : { inherit name value; };
|
|
# attribute set containing one attribute
|
|
nvs = name : value : listToAttrs [ (nv 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));
|
|
|
|
# iterates over a list of attributes collecting the attribute attr if it exists
|
|
catAttrs = attr : l : fold ( s : l : if (hasAttr attr s) then [(builtins.getAttr attr s)] ++ l else l) [] l;
|
|
|
|
mergeAttr = x : y : x // y;
|
|
mergeAttrs = fold mergeAttr {};
|
|
|
|
attrVals = nameList : attrSet :
|
|
map (x: builtins.getAttr x attrSet) nameList;
|
|
|
|
# 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 and can be used when composing using
|
|
# foldArgs, composedArgsAndFun or applyAndFun. Example: composableDerivation in all-packages.nix
|
|
mergeAttrByFunc = x : y :
|
|
let
|
|
mergeAttrBy2 = { mergeAttrBy=mergeAttr; }
|
|
// (maybeAttr "mergeAttrBy" {} x)
|
|
// (maybeAttr "mergeAttrBy" {} y); in
|
|
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 : nv n concatList) [ "buildInputs" "propagatedBuildInputs" "configureFlags" "prePhases" "postAll" ])
|
|
// listToAttrs (map (n : nv n mergeAttr) [ "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 ++ [ ( nv 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?
|
|
prepareDerivationArgs = args:
|
|
let args2 = { cfg = {}; flags = {}; } // args;
|
|
flagName = name : "${name}Support";
|
|
cfgWithDefaults = (listToAttrs (map (n : nv (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" "fixed" ]; # fixed may be passed as fix argument or such
|
|
|
|
}
|