Data.Settings.Section

This module provides functions work working with the Section type, i.e. option trees. The style is similar to the APIs for HashMaps and Maps. You can use these functions to construct a custom settings tree UI. Before you do that, try the Data.Settings.Interface module, which may already offer what you need.

Construction

empty :: Section m

Construct an empty section, no options and no subsections.

singleton :: SecName -> Option m -> Section m

Construct a section with a single option.

Observation

hasOpts :: Section m -> Bool

Return True if this section contains any options, False otherwise.

hasSubs :: Section m -> Bool

Return True if this section contains any subsections, False otherwise.

null :: Section m -> Bool

Return True if this section is empty (no options, no subsections), False otherwise.

member :: OptRoute -> Section m -> (Bool, Bool)

Return True if an option or a subsection is present at the specified path, False otherwise.

memberOpt :: OptRoute -> Section m -> Bool

Return True if an option is present at the specified path, False otherwise.

memberSub :: OptRoute -> Section m -> Bool

Return True if a subsection is present at the specified path, False otherwise.

lookup :: OptRoute -> Section m -> Maybe (Either (Section m) (Option m))

Return Just the section or option at the specified path, or Nothing if this section contains no such path.

lookupOpt :: [String] -> Section m -> Maybe (Option m)

Return Just the option at the specified path, or Nothing if this section doesn't contain an option at this path.

lookupSub :: [String] -> Section m -> Maybe (Section m)

Return Just the section at the specified path, or Nothing if this section doesn't contain a subsection at this path.

Modification

insert :: [String] -> Option m -> Section m -> Section m

Add the specified option at the specified path under this section. If the section previously contained an option for this path, the old value is replaced.

deleteOpt :: [String] -> Section m -> Section m

Remove the option at the specified path, if present. If there is a section under this path, it won't be removed.

deleteSub :: [String] -> Section m -> Section m

Remove the section at the specified path, if present. If there is an option under this path, it won't be removed.

delete :: [String] -> Section m -> Section m

Remove the option or section at the specified path, if present.