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App-used (v0.0.8)

Uses simple regex instead of properly parses Perl source code (PPI, Compiler::Lexer) so potentially lots of false positives. Better use existing solutions like Perl::PrereqScanner or Perl::PrereqScanner::Lite, which already come with their own CLI's.

spamcupNG (0.6) *

What does this offer over the established module WWW::Mechanize::SpamCop?

Also, shouldn't this module be called App::SpamcupNG?

Net-FTPServer (1.122)

Currently the only "real" module to create FTP servers in Perl. My suggestion would be to separate the Perl API documentation vs using the ftpd*.pl script, as the Net::FTPServer documentation currently mixes the two.

XML-LibXML (2.0132) *****

Eveybody who gives comment for this module has already told everything about the module. What I can only say that if you are not able to do something about XML, just try XML::LibXML before you give up, you will see that what you try to do is not imposible. Thanks for this great module and thanks for everybody in CPAN for their effort to keep Perl still one of the most usable and promising language...

Pango (1.227)

Undocumented and unuseable. The few times I have needed to use this, it's been far more trouble than it was worth. For example, how on earth can I load an arbitrary typeface? There doesn't seem to be documentation even in the C version.

I ended up doing the following procedure:

* Write a parser to break the truetype font format up
* Write a method of getting the curves out of the truetype font
* Write a drawing routines to draw the truetype font curves onto a Cairo canvas

That's how I did these illustrations, for example:

www.sljfaq.org/afaq/similar-kana.html

I don't understand how people can be using this module at all, it doesn't make sense to me. I even had to make a module called PangoConst (on CPAN) because this doesn't export its constants.

BioPerl (1.007002) *****

BioPerl is the standard library for bioinformatics in Perl. Its design leans fairly heavily on concepts borrowed from Java and other object-oriented languages (for example, the separation between interfaces and implementation classes), which means that it is somewhat hard to understand the sprawling architecture at first but also that it is very, very extensible.

Once you get it - and there is good documentation and a user community to help you with this - it turns out to be very useful. This is probably especially true for the many different file readers and writers. Bioinformatics is unfortunately plagued by a proliferation of file formats, many of which are represented in BioPerl. Other good things are the interfacing with web services and databases, and the architecture for invoking command line tools and parsing the results.

If you are doing something with biological data in Perl you probably need to learn BioPerl.

Geo-Coder-RandMcnally (0.01) *****

Works well.

Geo-Coder-Ovi (0.03) *****

Does what it says on the tin. Thanks so much! I'll add support in the next release of Geo::Coder::List.

Games-Sudoku-CLI (0.02) *****

Early release, so not polished yet, but... cool! Thanks, Gabor. We need more CLI games!

XML-TreePP (0.43) *****

This module is direct replacement for XML::Simple (Core module) and "relatively faster" that it. Many options are the same with XML::Simple. It appends prefix ('-') to attributes by default, but it can easily be changed by ..->set( attr_prefix => '' ) call to none or any other character. It should be a core module in my opinion.

HTML-Scrubber (0.17) ****

very configurable module in order to sanitize your HTML

Unicode-String (2.10)

It has basic errors in compilation:

rt.cpan.org/Public/Bug/Display.html?i...

The database included with the module is an old one which doesn't include the latest Unicode characters:

use Unicode::UCD 'charinfo';

use Unicode::CharName 'uname';

print uname (0x1F61C), "\n";

print charinfo (0x1f61c)->{name}, "\n";

outputs
```
defined(%hash) is deprecated at /home/ben/software/install/lib/perl5/site_perl/5.18.2/i386-freebsd/Unicode/CharName.pm line 80.

(Maybe you should just omit the defined()?)
Use of uninitialized value in print at /home/ben/charname-test.pl line 6.

FACE WITH STUCK-OUT TONGUE AND WINKING EYE
```
Even pod errors in the documentation remain unfixed:

rt.cpan.org/Public/Bug/Display.html?i...

Too bad that this module has been neglected since Unicode::UCD is incredibly heavyweight in terms of loading and also lookups, with loading taking 0.05 seconds and each call to charinfo taking about 0.10 seconds.

Devel-PerlySense (0.0218) ****

What a pleasant surprise! I had never heard of PerlySense before. For installation from CPAN on Debian Stretch I had to suppress tests, but after that everything seems to work just fine. The class overview is just wonderful... makes navigating big projects a lot faster.
Lots of keystrokes to remember... integration into the Emacs menu would be great for beginners like me.

File-Dircmp (1.30)

The module seems to work correctly. The documentation is unformatted:

metacpan.org/pod/File::Dircmp

One of the documented parameters for the sole function, dircmp, $diff, is read into a global variable:

metacpan.org/source/SCHULTE/File-Dirc...

but a quick search will show that g_d is ignored. It says that is a "TODO" in the documentation, but since the last release was in 2004, it looks unlikely to ever be implemented.

The output is a lot of strings like this:

"Files /home/ben/lemoda/deploy-current/go/gzip-handler/index.html and /home/ben/lemoda/deploy-previous/go/gzip-handler/index.html differ"

I don't understand why it outputs strings like this, rather than some kind of parsed format.

The module does not seem to attempt to go into directories which are only in one directory but not the other, similar to the Unix diff command.

People considering what module to use might want to also consider using File::DirCompare:

metacpan.org/pod/File::DirCompare

It seems more useable since it relies on a callback function rather than producing a lot of formatted strings.

XML-Hash-XS (0.51) *****

This is a great module! It does its job efficiently and is a joy to use. Thanks, Yuriy!
SSF

Net-IPv6Address (0.02) *

I strongly suggest not using this module for the following reasons:

* It has no tests beyond ok(1)

metacpan.org/source/JJMB/Net-IPv6Addr...

and yet it fails tests on most systems.

matrix.cpantesters.org/?dist=Net-IPv6...

* The main module relies on something called "Debug" yet does not supply that.

metacpan.org/source/JJMB/Net-IPv6Addr...

rt.cpan.org/Public/Bug/Display.html?i...

* Its documentation is completely unformatted.

metacpan.org/pod/Net::IPv6Address#DES...

* It has not been updated since 2008.

Module-Build (0.4224) *

Absolutely horrible. Intended as a replacement for the ExtUtils::MakeMaker, but does not replicate EU::MM's install options, nor fully document its differences. After ten years of using it, I am sick of modules which use Build.PL failing to install, or build into Debian packages due to permissions errors.

After a decade, you've had long enough to prove perl can do everything make can seamlessly. It can't, or at least your implementation can't. Make works. This module feels as though it exists out of an ideological purity, rather than any technical superiority to EU::MM.

If you are a module author, using this module is trading the users of your module's ease of use for your own. I would discourage any module authors from using Module::Build in the strongest possible terms.

Shannon-Entropy (0.04)

It's not very clear what this calculates, since it isn't documented, and the module is written almost as obfuscated Perl, and the output results of the module given in the documentation don't really make sense. There is not really any such thing as the Shannon entropy of a string, unless one defines the probabilities of the alphabet beforehand, which this doesn't do.

YAML (1.23)

To erikb495: the tarball of this version (and subsequent devel versions) unpacks correctly for me, as well as for metacpan and search.cpan.org ( metacpan.org/source/INGY/YAML-1.23 ), this is not a problem in the module. Please use the issue tracker or a module's listed support channels to discuss issues rather than a review site.

Pod-ProjectDocs (0.48) *****

Bhai gand fad hai. Awesome!

YAML (1.23) *

This YAML won't install. It unpacks in the current directory in a flat hierarchy.
ns2 .../home/bennett/tmp 554# ll YAML-1.23.tar.gz
-rwxr-xr-x 1 bennett tsysadm 83566 Aug 19 09:20 YAML-1.23.tar.gz*
ns2 .../home/bennett/tmp 555# tar tzf YAML-1.23.tar.gz
YAML-1.23
README
Changes
t
svk.t
LICENSE
xt
pod.t
pmv.t
test.t
MANIFEST
META.yml
meta.t
inbox.t
META.json
numify.t
export.t
errors.t
regexp.t
changes.t
bugs-rt.t
lib
YAML.pm
Makefile.PL
CONTRIBUTING
marshall.t
issue-69.t
preserve.t
rt-90593.t
YAML.pod
dump-file.t
node-info.t
TestYAML.pm
... you get the idea ...

PPR (0.000011) *****

The coolest thing since PPI. Now every time someone still says that one can't parse HTML or balanced parentheses using regex, you can just point him to this module to shut him up (although, if he had said that one *shouldn't*...).

Also now you can say that Perl is a simple language that is easy to learn. Why? Well, it's so simple you can parse the whole syntax with a single regex.

Compress-Zstd (0.05)

This module offers an interface to Facebook's new Zstandard compression library based on the new asymmetric numeral compression algorithms of Jarek Duda. It incorporates the Zstandard libraries into the module, which means that you don't have to download any third-party libraries to install this. It should be a great contribution, but I have to say I'm frustrated by this module.

If you look at the tests here:

matrix.cpantesters.org/?dist=Compress...

it's fairly clear that there is a problem. The problem can be solved with a very minor change:

github.com/spiritloose/Compress-Zstd/...

The bug was reported twice:

github.com/spiritloose/Compress-Zstd/...

The author went on to release another version to CPAN after the bug reports.

While I think this module could be a big contribution to CPAN, I'm not really sure why the module owner won't fix trivial bugs like that, but leaves the module in a state of disarray.

All of the Windows compilations report errors too:

www.cpantesters.org/cpan/report/f2b84...

www.cpantesters.org/cpan/report/0cc9e...

I don't know how these problems could be rectified, but presumably it is just a question of using the right compilation options.

DBIx-Compare (1.7) **

Use MySQL-specific SQL dialect "SHOW TABLES" so comparing e.g. two SQLite database is an instant fail, even though there is DBIx::Compare::SQLite. Instead of the common convention like DBIx::Compare->new(...), uses db_comparison->new(...), sqlite_comparison->new(...), etc.

ExtUtils-ParseXS (3.35)

Doesn't accept bugreports.
Broken visibility for -flto=thin (link time optimization) and solaris,
fixed in cperl since Nov 2016.
The CPAN release misses the 3 xs pods.
do_open() broken under C++, fixed in cperl since Nov 2016.