attach_packs/2

Documentation
- Reference manual
  - Packs: community add-ons
    - Built-in predicates for attaching packs
- Packages

Availability:built-in

attach_packs(+Directory)

attach_packs(+Directory, +Options)

Attach all packs that are subdirectories of Directory. Directory is translated into a physical directory using absolute_file_name/3. This implies it can be a term Alias(SubDir) and the search is relative to the current source file if Directory is not an absolute path and these predicates are used as a directive. Defined options are:

search(+Where): Determines the order in which pack library directories are searched. Default is to add new packages at the end (last). Using first, new packages are added at the start.
duplicate(+Action): Determines what happens if a pack with the same name is already attached. Default is warning, which prints a warning and ignores the new pack. Other options are keep, which is like warning but operates silently and replace, which detaches the old pack and attaches the new.
replace(+Boolean): If true, unregister all packs before registering the new packs.

The predicate attach_packs/2 can be used to attach packages that are bundled with an application. With the option replace(true), attach_packs/2 ensures that the application only relies on bundled packs.