NAME

Perinci::Sub::Complete - Shell completion routines using Rinci metadata

VERSION

version 0.35

SYNOPSIS

# require'd by Perinci::CmdLine when shell completion is enabled

DESCRIPTION

This module provides functionality for doing shell completion. It is meant to be used by Perinci::CmdLine, but nevertheless some routines are reusable outside it.

FUNCTIONS

None are exported by default, but they are exportable.

complete_arg_val(%args) -> array

Arguments ('*' denotes required arguments):

• arg* => str

  Argument name.

• args => hash

  Collected arguments so far, will be passed to completion routines.

• ci => bool (default: 0)

  Whether to be case-insensitive.

• meta* => hash

  Rinci function metadata.

• parent_args => hash

  To pass parent arguments to completion routines.

• word => str (default: "")

  Word to be completed.

Return value:

shell_complete_arg(%args) -> array

Assuming that command-line like:

foo a b c

is executing some function, and the command-line arguments will be parsed using Perinci::Sub::GetArgs::Argv, then try to complete command-line arguments using information from Rinci metadata.

Algorithm:

1. If word begins with $, we complete from environment variables and are done.

2. Call get_args_from_argv() to extract hash arguments from the given words.

3. Determine whether we need to complete argument name (e.g. --arg<tab>) or argument value (e.g. --arg1 <tab> or <tab> at 1st word where there is an argument specified at pos=0).

4. Call custom_completer if defined. If a list of words is returned, we're done. This can be used for, e.g. nested function call, e.g.:

   somecmd --opt-for-cmd ... subcmd --opt-for-subcmd ...

5. If we are completing argument name, then supply a list of possible argument names, or fallback to completing filenames.

6. If we are completing argument value, first check if custom_arg_completer is defined. If yes, call that routine. If a list of words is returned, we're done. Fallback to completing argument values from information in Rinci metadata (using complete_arg_val() function).

Arguments ('*' denotes required arguments):

• common_opts => array (default: [["--help", "-?", "-h"]])

  Common options.

  When completing argument name, this list will be added.

• custom_arg_completer => code|hash

  Supply custom argument value completion routines.

  Either code or a hash of argument names and codes.

  If supplied, instead of the default completion routine, this code will be called instead. Refer to function description to see when this routine is called.

  Code will be called with hash arguments containing these keys: word (string, the word to be completed), arg (string, the argument name that we are completing the value of), args (hash, the arguments that have been collected so far), parent_args.

  A use-case for using this option: getting argument value from Riap client using the complete_arg_val action. This allows getting completion from remote server.

• custom_completer => code

  Supply custom completion routine.

  If supplied, instead of the default completion routine, this code will be called instead. Refer to function description to see when this routine is called.

  Code will be called with a hash argument, with these keys: which (a string with value name or value depending on whether we should complete argument name or value), words (an array, the command line split into words), cword (int, position of word in words), word (the word to be completed), parent_args (hash, arguments given to shell_complete_arg()), args (hash, parsed function arguments from words) remaining_words (array, slice of words after cword), meta (the Rinci function metadata).

  Code should return an arrayref of completion, or undef to declare declination, on which case completion will resume using the standard builtin routine.

  A use-case of using this option: XXX.

• cword => int

  On which word cursor is located (zero-based).

  If unset, will be taken from COMPLINE and COMPPOINT.

• extra_completer_args => hash

  Arguments to pass to custom completion routines.

• meta* => hash

  Rinci function metadata.

• words => array

  Command-line, broken as words.

  If unset, will be taken from COMPLINE and COMPPOINT.

Return value:

BUGS/LIMITATIONS/TODOS

Due to parsing limitation (invokes subshell), can't complete unclosed quotes, e.g.

foo "bar <tab>

while shell function can complete this because they are provided COMP_WORDS and COMP_CWORD by bash.

SEE ALSO

Perinci::CmdLine

Other shell completion modules on CPAN: Getopt::Complete, Bash::Completion.

HOMEPAGE

Please visit the project's homepage at https://metacpan.org/release/Perinci-Sub-Complete.

SOURCE

Source repository is at https://github.com/sharyanto/perl-Perinci-Sub-Complete.

BUGS

Please report any bugs or feature requests on the bugtracker website https://rt.cpan.org/Public/Dist/Display.html?Name=Perinci-Sub-Complete

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

AUTHOR

Steven Haryanto <stevenharyanto@gmail.com>

COPYRIGHT AND LICENSE

This software is copyright (c) 2013 by Steven Haryanto.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

cpanm Perinci::Sub::Complete

perl -MCPAN -e shell
install Perinci::Sub::Complete