CPAN::Nearest - find the nearest module to a given name.
use CPAN::Nearest 'search'; my $module = search ('02package.details.txt', 'Lingua::Stop::Wars'); # Now $module = "Lingua::StopWords";
This module provides a way of searching for CPAN modules whose name may be misspelt. For example, if a user accidentally types "Lingua::Stopwords" when looking for the module "Lingua::StopWords", the common cpan clients will not be able to function:
Warning: Cannot install Lingua::Stopwords, don't know what it is. Try the command i /Lingua::Stopwords/ to find objects with matching identifiers.
! Finding Lingua::Stopwords on cpanmetadb failed. ! Finding Lingua::Stopwords on search.cpan.org failed. ! Finding Lingua::Stopwords () on mirror http://www.cpan.org failed. ! Couldn't find module or a distribution Lingua::Stopwords ()
CPAN::Nearest supplies a spelling-mistake tolerant search for the most similar name, intended for people making tools like
pm-uninstall, and anything else which needs to use the CPAN packages list. CPAN::Nearest was written to be fast enough for practical use.
CPAN::Nearest was inspired by the helpful "git" version control system, which provides suggestions for spelling mistakes.
my $close_name = search ($file, $module_name);
Search the package detail file
$file for a module named
$module_name and return the closest name. E.g. if you search for "Harry::Potter",
my $close_name = search ($file, 'Harry::Potter');
the value in
$close_name, the closest CPAN module, is "Data::Lotter".
The file specified by the first argument,
$file in the example, is usually found at ~/.cpan/sources/modules/02packages.details.txt.gz on a Unix-like system. This may be specified as the file name. This module can read either a compressed or uncompressed version. There is a speed increase of 10-20% when an uncompressed file is used.
Users of the
cpan utility supplied with Perl may find the file listing the CPAN modules in ~/.cpan/sources/modules/02packages.details.txt.gz. Others can download the file from the directory /modules/ of any CPAN mirror.
The distribution includes a standalone program called "nearest-module" as shown in this blog entry. To use this program, edit the file nearest-module.c in the top level of the distribution to point to the name of the file 02packages.details.txt or 02packages.details.txt.gz on your system, and compile it with
make -f makeitfile nearest-module
It is run with the name of a single module:
./nearest-module Lingo::Jingo::Mojo Closest to 'Lingo::Jingo::Mojo' is 'Lingua::JA::Moji'.
There is a
-v option to view candidate modules:
$ ./nearest-module -v Lingo::Jingo::Mojo Games::Bingo::Bot (9) is nearer than 10. Lingua::JA::Moji (7) is nearer than 9. Closest to 'Lingo::Jingo::Mojo' is 'Lingua::JA::Moji'.
Ben Bullock, <firstname.lastname@example.org>
This package and associated files are copyright (C) 2012-2014 Ben Bullock.
You can use, copy, modify and redistribute this package and associated files under the Perl Artistic Licence or the GNU General Public Licence.