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Share common code for merging option definitions.

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This move idioms which were used in `evalOptionValue` and in the `merge`
functions of `listOf` and `attrsOf` types, such that we can use a names such
as `isDefined` and `optionalValue` instead or repeating identical
comparisons of `defsFinal == []`.
This commit is contained in:
Nicolas B. Pierron 2015-03-12 23:01:47 +01:00
parent dd4f5f6b78
commit ed91474e9b
2 changed files with 21 additions and 19 deletions
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18
lib/modules.nix
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@ -250,14 +250,14 @@ rec {
# Add in the default value for this option, if any.
defs' = (optional (opt ? default)
{ file = head opt.declarations; value = mkOptionDefault opt.default; }) ++ defs;
# Handle properties, check types, and merge everything together
inherit (mergeDefinitions loc opt.type defs') defsFinal mergedValue;
inherit (mergeDefinitions loc opt.type defs') isDefined defsFinal mergedValue;
files = map (def: def.file) defsFinal;
merged =
if defsFinal == [] then
throw "The option `${showOption loc}' is used but not defined."
else
mergedValue;
if isDefined then mergedValue
else throw "The option `${showOption loc}' is used but not defined.";
# Finally, apply the ‘apply’ function to the merged
# value. This allows options to yield a value computed
# from the definitions.
@ -265,8 +265,7 @@ rec {
in opt //
{ value = addErrorContext "while evaluating the option `${showOption loc}':" value;
definitions = map (def: def.value) defsFinal;
isDefined = defsFinal != [];
inherit files;
inherit isDefined files;
};
# Merge definitions of a value of a given type
@ -295,6 +294,11 @@ rec {
if type.check def.value then res
else throw "The option value `${showOption loc}' in `${def.file}' is not a ${type.name}.")
(type.merge loc defsFinal) defsFinal;
isDefined = defsFinal != [];
optionalValue =
if isDefined then { value = mergedValue; }
else {};
};
/* Given a config set, expand mkMerge properties, and push down the