lib/module: add mkChangedOptionModule function

This commit is contained in:
Eric Sagnes 2016-09-24 21:10:29 +09:00
parent 13eefc3a31
commit 26ea947d33

View file

@ -598,6 +598,32 @@ rec {
(mergeFn config)));
};
/* Single "from" version of mkMergedOptionModule.
Return a module that causes a warning to be shown if the "from" option is
defined; the defined value can be used in the "mergeFn" to set the "to"
value.
This function can be used to change an option into another that has a
different type.
"mergeFn" takes the module "config" as a parameter and must return a value of
"to" option type.
mkChangedOptionModule [ "a" "b" "c" ] [ "x" "y" "z" ]
(config:
let value = getAttrFromPath [ "a" "b" "c" ] config;
in
if value > 100 then "high"
else "normal")
- options.a.b.c is a removed int option
- options.x.y.z is a new str option that supersedes a.b.c
This show a warning if a.b.c is set, and set the value of x.y.z to the
result of the change function
*/
mkChangedOptionModule = from: to: changeFn:
mkMergedOptionModule [ from ] to changeFn;
/* Like mkRenamedOptionModule, but doesn't show a warning. */
mkAliasOptionModule = from: to: doRename {
inherit from to;