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factor mergeOptionSets and filterOptionSets into the function handleOptionSets.

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svn path=/nixpkgs/trunk/; revision=13838
This commit is contained in:
Nicolas Pierron 2009-01-25 00:31:23 +00:00
parent db7f0d3ef5
commit 13d5c8923d
1 changed files with 52 additions and 29 deletions
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81
pkgs/lib/default.nix
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@ -485,11 +485,11 @@ rec {
else if all __isAttrs list then mergeAttrs list
else if all (x: true == x || false == x) list then fold logicalOR false list
else if all (x: x == toString x) list then concatStrings list
else abort "${name}: Cannot merge values.";
else throw "Cannot merge values.";
mergeTypedOption = typeName: predicate: merge: name: list:
if all predicate list then merge list
else abort "${name}: Expect a ${typeName}.";
else throw "Expect a ${typeName}.";
mergeEnableOption = mergeTypedOption "boolean"
(x: true == x || false == x) (fold logicalOR false);
@ -501,38 +501,59 @@ rec {
(x: if builtins ? isString then builtins.isString x else x + "")
concatStrings;
# Merge sets of options and bindings.
# noOption: function to call if no option is declared.
mergeOptionSets = noOption: path: opts:
if all __isAttrs opts then
zip (attr: opts:
let
name = if path == "" then attr else path + "." + attr;
test = partition isOption opts;
opt = ({ merge = mergeDefaultOption; apply = id; } // head test.right);
in
if test.right == [] then mergeOptionSets noOption name (map delayIf test.wrong)
else if tail test.right != [] then throw "Multiple options for '${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:
# Handle the traversal of option sets. All sets inside 'opts' are zipped
# and options declaration and definition are separated. If no option are
# declared at a specific depth, then the function recurse into the values.
# Other cases are handled by the optionHandler which contains two
# functions that are used to defined your goal.
# - export is a function which takes two arguments which are the option
# and the list of values.
# - notHandle is a function which takes the list of values are not handle
# by this function.
handleOptionSets = optionHandler@{export, notHandle, ...}: path: opts:
if all __isAttrs opts then
zip (attr: opts:
let
name = if path == "" then attr else path + "." + attr;
test = partition isOption opts;
opt = {
inherit name;
merge = mergeDefaultOption;
apply = id;
} // (head test.right);
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)
if test.right == [] then handleOptionSets optionHandler name (map delayIf test.wrong)
else addLocation "while evaluating the option ${name}:" (
if tail test.right != [] then throw "Multiple options."
else export opt (map evalIf test.wrong)
)
) opts
else {};
else addLocation "while evaluating ${path}:" (notHandle opts);
# Merge option sets and produce a set of values which is the merging of
# all options declare and defined. If no values are defined for an
# option, then the default value is used otherwise it use the merge
# function of each option to get the result.
mergeOptionSets = noOption: newMergeOptionSets; # ignore argument
newMergeOptionSets =
handleOptionSets {
export = opt: values:
opt.apply (
if values == [] then
if opt ? default then opt.default
else throw "Not defined."
else opt.merge (opt.name) values
);
notHandle = throw "Used without option declaration.";
};
# Keep all option declarations.
filterOptionSets =
handleOptionSets {
export = opt: values: opt;
notHandle = {};
};
# Evaluate a list of option sets that would be merged with the
# function "merge" which expects two arguments. The attribute named
@ -550,11 +571,11 @@ rec {
# 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, ...}: {..}
let result = configFun { inherit pkgs config merge; }; in
# {pkgs, config, merge, ...}: {..}
if builtins.isAttrs result then result
# pkgs: config: {..}
else configFun pkgs config
else builtins.trace "obsolete:" (configFun {} {})
# {..}
else configFun;
@ -592,6 +613,8 @@ rec {
innerModifySumArgs f x (a // b);
modifySumArgs = f: x: innerModifySumArgs f x {};
addLocation = if builtins ? addLocation then builtins.addLocation else msg: val: val;
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;