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docs: lib/options.nix function documentation

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Tobias Pflug 2017-10-30 18:12:49 +01:00 committed by Robert Hensing
parent 1643967b8d
commit d5166027e2
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39
lib/options.nix
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@ -8,7 +8,31 @@ with lib.strings;
rec {
# Returns true when the given argument is an option
#
# Examples:
# isOption 1 // => false
# isOption (mkOption {}) // => true
isOption = lib.isType "option";
# Creates an Option attribute set. mkOption accepts an attribute set with the following keys:
#
# default: Default value used when no definition is given in the configuration.
# defaultText: Textual representation of the default, for in the manual.
# example: Example value used in the manual.
# description: String describing the option.
# type: Option type, providing type-checking and value merging.
# apply: Function that converts the option value to something else.
# internal: Whether the option is for NixOS developers only.
# visible: Whether the option shows up in the manual.
# readOnly: Whether the option can be set only once
# options: Obsolete, used by types.optionSet.
#
# All keys default to `null` when not given.
#
# Examples:
# mkOption { } // => { _type = "option"; }
# mkOption { defaultText = "foo"; } // => { _type = "option"; defaultText = "foo"; }
mkOption =
{ default ? null # Default value used when no definition is given in the configuration.
, defaultText ? null # Textual representation of the default, for in the manual.
@ -24,6 +48,10 @@ rec {
} @ attrs:
attrs // { _type = "option"; };
# Creates a Option attribute set for a boolean value option i.e an option to be toggled on or off:
#
# Examples:
# mkEnableOption "foo" // => { _type = "option"; default = false; description = "Whether to enable foo."; example = true; type = { ... }; }
mkEnableOption = name: mkOption {
default = false;
example = true;
@ -74,7 +102,18 @@ rec {
else
val) (head defs).value defs;
# Extracts values of all "value" keys of the given list
#
# Examples:
# getValues [ { value = 1; } { value = 2; } ] // => [ 1 2 ]
# getValues [ ] // => [ ]
getValues = map (x: x.value);
# Extracts values of all "file" keys of the given list
#
# Examples:
# getFiles [ { file = "file1"; } { file = "file2"; } ] // => [ "file1" "file2" ]
# getFiles [ ] // => [ ]
getFiles = map (x: x.file);
# Generate documentation template from the list of option declaration like