DESCRIPTION

    The namespace Complete:: is used for the family of modules that deal
    with completion (including, but not limited to, shell tab completion,
    tab completion feature in other CLI-based application, web
    autocomplete, completion in GUI, etc). This (family of) modules try to
    have a clear separation between general completion routine and
    shell-/environment specific ones, for more reusability.

    This POD page establishes convention and gives an overview of the
    modules in Complete::*.

 Modules

  Common/shared settings and other stuffs

    Complete::Common

  Generic (non-environment-specific) modules

    Modules usually are named after the type of completion answer they
    provide. For example: Complete::Unix completes username/group name,
    Complete::Getopt::Long completes from Getopt::Long specification,
    Complete::Module completes Perl module names, and so on. A current
    exception is Complete::Util which contains several routines to complete
    from common/generic sources (array, hash, file, environment).

  Environment-specific modules

    Complete::Bash::* modules are specific to bash shell. See
    Complete::Bash on some of the ways to do bash tab completion with Perl.
    Other shells are also supported. For shell-specific information, please
    refer to Complete::Zsh, Complete::Tcsh, Complete::Fish, as well as
    their submodules.

    Complete::* modules for non-shell environment (like browser or GUI)
    have not been developed. Please check again from time to time in the
    future.

 complete_*() functions

    The main functions that do the actual completion are the complete_*()
    functions. These functions are generic completion routines: they accept
    the word to be completed, zero or more other arguments, and return a
    completion answer structure (see "Completion answer structure").

     use Complete::Util qw(complete_array_elem);
     my $ary = complete_array_elem(array=>[qw/apple apricot banana/], word=>'ap');
     # -> ['apple', 'apricot']

    Convention for complete_* function:

      * Accept a hash argument

      Example:

       complete_array_elem(%args)

      Required arguments: word (the word to be completed). Sometimes, for
      lower-level functions, you can accept words and cword instead of
      word, For example, in function
      Complete::Getopt::Long::complete_cli_arg.

      You can define more arguments as you fit. Often there is at least one
      argument to specify or customize the source of completion, for
      example for the function Complete::Util::complete_array_elem there is
      an array argument to specify the source array.

      * Follow behaviors specified in Complete::Common

      * Return completion answer structure

      See "Completion answer structure".

 Completion answer structure

    complete_*() functions return completion answer structure. Completion
    answer contains the completion entries as well as extra metadata to
    give hints to formatters/tools. It is a hashref which can contain the
    following keys:

      * words => array

      This key is required. Its value is an array of completion entries. A
      completion entry can be a string or a hashref. Example:

       ['apple', 'apricot'] # array of strings
      
       [{word=>'apple', summary=>'A delicious fruit with thousands of varieties'},
        {word=>'apricot', summary=>'Another delicious fruit'},] # array of hashes

      As you can see from the above, each entry can contain description
      (can be displayed in shells that support them, like fish and zsh).

      * type => str

      See Complete::Bash.

      * path_sep => str

      See Complete::Bash.

      * esc_mode => str

      See Complete::Bash.

      * static => bool

      Specify that completion is "static", meaning that it does not depend
      on external state (like filesystem) or a custom code which can return
      different answer everytime completion is requested.

      This can be useful for code that wants to generate completion code,
      like bash completion or fish completion. Knowing that completion for
      an option value is static means that completion for that option can
      be answered from an array instead of having to call code/program
      (faster).

    As a shortcut, completion answer can also be an arrayref (just the
    words) without any metadata.

    Examples:

     # hash form
     {words=>[qw/apple apricot/]}
    
     # another hash form. type=env instructs formatter not to escape '$'
     {words=>[qw/$HOME $ENV/], type=>'env'}
    
     # array form
     ['apple', 'apricot']
    
     # another array form, each entry is a hashref to include description
     [{word=>'apple', summary=>'A delicious fruit with thousands of varieties'},
      {word=>'apricot', summary=>'Another delicious fruit'},] # array of hashes

