NAME
    Module::Util - Module name tools and transformations

SYNOPSIS
        use Module::Util qw( :all );

        $valid = is_valid_module_name $potential_module;

        $relative_path = module_path $module_name;

        $file_system_path = module_fs_path $module_name;

        # load module at runtime
        require module_path $module_name;

        # (see perldoc -f require for limitations of this approach.)

DESCRIPTION
    This module provides a few useful functions for manipulating module
    names. Its main aim is to centralise some of the functions commonly used
    by modules that manipulate other modules in some way, like converting
    module names to relative paths.

EXPORTS
    Nothing by default.

    Use the tag :all to import all functions.

FUNCTIONS
  is_valid_module_name
        $bool = is_valid_module_name($module)

    Returns true if $module looks like a module name, false otherwise.

  module_is_loaded
        $abs_path_or_hook = module_is_loaded($module)

    Returns the %INC entry for the given module. This is usually the
    absolute path of the module, but sometimes it is the hook object that
    loaded it.

    See perldoc -f require

    Equivalent to:

        $INC{module_path($module)};

    Except that invalid module names simply return false without generating
    warnings.

  find_installed
        $path = find_installed($module, [@inc])

    Returns the first found installed location of the given module. This is
    always an absolute filesystem path, even if it is derived from a
    relative path in the include list.

    By default, @INC is searched, but this can be overridden by providing
    extra arguments.

        # look in @INC
        $path = find_installed("Module::Util")

        # look only in lib and blib/lib, not in @INC
        $path = find_installed("Module::Util", 'lib', 'blib/lib')

    Note that this will ignore any references in the search path, so it
    doesn't necessarily follow that the module cannot be successfully
    "require"d if this returns nothing.

  all_installed
        @paths = all_installed($module, [@inc])

    Like find_installed, but will return multiple results if the module is
    installed in multiple locations.

  find_in_namespace
        @modules = find_in_namespace($namespace, [ @inc ])

    Searches for modules under a given namespace in the search path (@INC by
    default).

        find_in_namespace("My::Namespace");

    Returns unique installed module names under the namespace. Note that
    this does not include the passed-in name, even if it is the name of an
    installed module.

    Use of an empty string as the namespace returns all modules in @inc.

  module_path
        $path = module_path($module)

    Returns a relative path in the form used in %INC. Which I am led to
    believe is always a unix file path, regardless of the platform.

    If the argument is not a valid module name, nothing is returned.

  module_fs_path
        $path = module_fs_path($module)

    Like module_path, but returns the path in the native filesystem format.

    On unix systems, this should be identical to module_path.

  path_to_module
        $module = path_to_module($path)

    Transforms a relative unix file path into a module name.

        # Print loaded modules as module names instead of paths:
        print join("\n", map { path_to_module($_) } keys %INC

    Returns undef if the resulting module name is not valid.

  fs_path_to_module
        $module = fs_path_to_module($fs_path)

    Transforms relative filesystem paths into module names.

        # on windows:
        fs_path_to_module("Module\\Util.pm")
        # returns Module::Util

    Returns undef if the resulting module is not valid.

  module_path_parts
        @parts = module_path_parts($module_name)

    Returns the module name split into parts suitable for feeding to
    File::Spec->catfile.

        module_path_parts('Module::Util')
        # returns ('Module', 'Util.pm')

    If the module name is invalid, nothing is returned.

  canonical_module_name
        $module = canonical_module_name($module);

    Returns the canonical module name for the given module. This basically
    consists of eliminating any apostrophe symbols and replacing them with
    '::'.

        canonical_module_name("Acme::Don't"); # Acme::Don::t

    Returns undef if the name is not valid.

  module_name_parts
        @parts = module_name_parts($module);

    Returns a list of name parts for the given module.

        module_name_parts('Acme::Example); # ('Acme', 'Example')

BUGS
    None known. Please report any found.

SEE ALSO
    pm_which, a command-line utility for finding installed perl modules that
    is bundled with this module.

    Other, similar CPAN modules:

    Class::Inspector, Module::Info,

    Module::Require, UNIVERSAL::require, Module::Runtime

    perldoc -f require

AUTHOR
    Matt Lawrence <mattlaw@cpan.org>

THANKS
    Alexander K├╝hne, Adrian Lai and Daniel Lukasiak for submitting patches.

COPYRIGHT
    Copyright 2005 Matt Lawrence, All Rights Reserved.

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