943592f698
Among other things, this will allow *2nix tools to output plain data while still being composable with the traditional callPackage/.override interfaces.
393 lines
16 KiB
Nix
393 lines
16 KiB
Nix
{ lib }:
|
|
let
|
|
inherit (builtins) head tail isList isAttrs isInt attrNames;
|
|
|
|
in
|
|
|
|
with lib.lists;
|
|
with lib.attrsets;
|
|
with lib.strings;
|
|
|
|
rec {
|
|
|
|
# returns default if env var is not set
|
|
maybeEnv = name: default:
|
|
let value = builtins.getEnv name; in
|
|
if value == "" then default else value;
|
|
|
|
defaultMergeArg = x : y: if builtins.isAttrs y then
|
|
y
|
|
else
|
|
(y x);
|
|
defaultMerge = x: y: x // (defaultMergeArg x y);
|
|
foldArgs = merger: f: init: x:
|
|
let arg = (merger init (defaultMergeArg init x));
|
|
# now add the function with composed args already applied to the final attrs
|
|
base = (setAttrMerge "passthru" {} (f arg)
|
|
( z: z // rec {
|
|
function = foldArgs merger f arg;
|
|
args = (lib.attrByPath ["passthru" "args"] {} z) // x;
|
|
} ));
|
|
withStdOverrides = base // {
|
|
override = base.passthru.function;
|
|
};
|
|
in
|
|
withStdOverrides;
|
|
|
|
|
|
# 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 lib.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 = args.${n};
|
|
in if isAttrs x then (mergeFun args x)
|
|
else assert lib.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 {};
|
|
|
|
|
|
# shortcut for attrByPath ["name"] default attrs
|
|
maybeAttrNullable = maybeAttr;
|
|
|
|
# shortcut for attrByPath ["name"] default attrs
|
|
maybeAttr = name: default: attrs: attrs.${name} or 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 (attrByPath ["flags"] [] attrSet)) then true else
|
|
attrByPath [name] false attrSet ;
|
|
|
|
|
|
# Input : attrSet, [ [name default] ... ], name
|
|
# Output : its value or default.
|
|
getValue = attrSet: argList: name:
|
|
( attrByPath [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));
|
|
|
|
|
|
# This function has O(n^2) performance.
|
|
uniqList = { inputList, acc ? [] }:
|
|
let go = xs: acc:
|
|
if xs == []
|
|
then []
|
|
else let x = head xs;
|
|
y = if elem x acc then [] else [x];
|
|
in y ++ go (tail xs) (y ++ acc);
|
|
in go inputList acc;
|
|
|
|
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;
|
|
|
|
lazyGenericClosure = {startSet, operator}:
|
|
let
|
|
work = list: doneKeys: result:
|
|
if list == [] then
|
|
result
|
|
else
|
|
let x = head list; key = x.key; in
|
|
if elem key doneKeys then
|
|
work (tail list) doneKeys result
|
|
else
|
|
work (tail list ++ operator x) ([key] ++ doneKeys) ([x] ++ result);
|
|
in
|
|
work startSet [] [];
|
|
|
|
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 = acc: xs:
|
|
if xs == []
|
|
then acc
|
|
else let y = head xs;
|
|
ys = tail xs;
|
|
in if ! isAttrs y
|
|
then innerClosePropagation acc ys
|
|
else let acc' = [y] ++ acc;
|
|
in innerClosePropagation
|
|
acc'
|
|
(uniqList { inputList = (maybeAttrNullable "propagatedBuildInputs" [] y)
|
|
++ (maybeAttrNullable "propagatedNativeBuildInputs" [] y)
|
|
++ ys;
|
|
acc = acc';
|
|
}
|
|
);
|
|
|
|
closePropagation = list: (uniqList {inputList = (innerClosePropagation [] list);});
|
|
|
|
# calls a function (f attr value ) for each record item. returns a list
|
|
mapAttrsFlatten = f: r: map (attr: f attr r.${attr}) (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 set ? ${n}
|
|
then setAttr set n (f set.${n} set2.${n})
|
|
else set )
|
|
(set2 // 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 exists 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 doesn't 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
|
|
# ! deprecated, use mergeAttrByFunc instead
|
|
mergeAttrsNoOverride = { mergeLists ? ["buildInputs" "propagatedBuildInputs"],
|
|
overrideSnd ? [ "buildPhase" ]
|
|
}: attrs1: attrs2:
|
|
fold (n: set:
|
|
setAttr set n ( if set ? ${n}
|
|
then # merge
|
|
if elem n mergeLists # attribute contains list, merge them by concatenating
|
|
then attrs2.${n} ++ attrs1.${n}
|
|
else if elem n overrideSnd
|
|
then attrs1.${n}
|
|
else throw "error mergeAttrsNoOverride, attribute ${n} given in both attributes - no merge func defined"
|
|
else attrs2.${n} # 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 x ? ${a}
|
|
then if y ? ${a}
|
|
then v x.${a} y.${a} # both have attr, use merge func
|
|
else x.${a} # only x has attr
|
|
else y.${a} # only y has attr)
|
|
) (removeAttrs mergeAttrBy2
|
|
# don't merge attrs which are neither in x nor y
|
|
(filter (a: ! x ? ${a} && ! y ? ${a})
|
|
(attrNames mergeAttrBy2))
|
|
)
|
|
)
|
|
];
|
|
mergeAttrsByFuncDefaults = foldl mergeAttrByFunc { inherit mergeAttrBy; };
|
|
mergeAttrsByFuncDefaultsClean = list: removeAttrs (mergeAttrsByFuncDefaults list) ["mergeAttrBy"];
|
|
|
|
# sane defaults (same name as attr name so that inherit can be used)
|
|
mergeAttrBy = # { buildInputs = concatList; [...]; passthru = mergeAttr; [..]; }
|
|
listToAttrs (map (n: nameValuePair n lib.concat)
|
|
[ "nativeBuildInputs" "buildInputs" "propagatedBuildInputs" "configureFlags" "prePhases" "postAll" "patches" ])
|
|
// listToAttrs (map (n: nameValuePair n lib.mergeAttrs) [ "passthru" "meta" "cfg" "flags" ])
|
|
// listToAttrs (map (n: nameValuePair n (a: b: "${a}\n${b}") ) [ "preConfigure" "postInstall" ])
|
|
;
|
|
|
|
# prepareDerivationArgs tries to make writing configurable derivations easier
|
|
# example:
|
|
# prepareDerivationArgs {
|
|
# mergeAttrBy = {
|
|
# myScript = x: y: x ++ "\n" ++ y;
|
|
# };
|
|
# cfg = {
|
|
# readlineSupport = true;
|
|
# };
|
|
# flags = {
|
|
# readline = {
|
|
# set = {
|
|
# configureFlags = [ "--with-compiler=${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: "${name}Support";
|
|
cfgWithDefaults = (listToAttrs (map (n: nameValuePair (flagName n) false) (attrNames args2.flags)))
|
|
// args2.cfg;
|
|
opts = attrValues (mapAttrs (a: v:
|
|
let v2 = if v ? set || v ? unset then v else { set = v; };
|
|
n = if cfgWithDefaults.${flagName a} 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" ];
|
|
|
|
|
|
nixType = x:
|
|
if isAttrs x then
|
|
if x ? outPath then "derivation"
|
|
else "attrs"
|
|
else if lib.isFunction x then "function"
|
|
else if isList x then "list"
|
|
else if x == true then "bool"
|
|
else if x == false then "bool"
|
|
else if x == null then "null"
|
|
else if isInt x then "int"
|
|
else "string";
|
|
|
|
/* deprecated:
|
|
|
|
For historical reasons, imap has an index starting at 1.
|
|
|
|
But for consistency with the rest of the library we want an index
|
|
starting at zero.
|
|
*/
|
|
imap = imap1;
|
|
}
|