Check if all used modules are use'ed

Sewi has asked for the wisdom of the Perl Monks concerning the following question:

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Re: Check if all used modules are use'ed by Corion (Patriarch) on Oct 27, 2011 at 09:49 UTC
I would assume that Module::Scandeps can do that. Alternatively, if you are worried about implicit loading of modules, I would just grep for everything that looks like a class name (`/\b(\w+(?:'\|::)(?:\w+(?:'\|::)?)*/`), and see where else that shows up. Note that `use $module` isn't sufficient, as there are many other "loader-style" modules, like if.	[reply] [d/l] [select]
Re^2: Check if all used modules are use'ed by Sewi (Friar) on Oct 27, 2011 at 12:41 UTC
scandeps doesn't work: `scandeps -e 'print $Foo::Bar::x' No modules found!` [download] and `use File::Spec::Unix; print $Foo::Bar::x; Bar::Baz->new' 'File::Spec::Unix' => '3.33',` [download] Try Padre - the free Perl IDE	[reply] [d/l] [select]
Re^3: Check if all used modules are use'ed by Anonymous Monk on Oct 27, 2011 at 18:09 UTC
scandeps isn't lint :) `$ perl -MO=Xref -e " print $Foo::Bar::x " \| perl -ne " $f++ if /Subro +utine..main/; print if $f " -e syntax OK Subroutine (main) Package Foo::Bar $x 1` [download]	[reply] [d/l]
Re: Check if all used modules are use'ed by JavaFan (Canon) on Oct 27, 2011 at 09:48 UTC
No, there is not such a script. Take the following code, which module is used, but not imported? `#!/usr/bin/perl use strict; use warnings; my $class1 = $ARGV[rand @ARGV]; my $class2 = $ARGV[rand @ARGV]; $class1 =~ s{::}{/}g; require "$class1.pm"; $class2->method(); __END__` [download] Even if you know the arguments, you still don't know which module is going to be used, and whether it's used without being required.	[reply] [d/l]
Re^2: Check if all used modules are use'ed by Sewi (Friar) on Oct 27, 2011 at 12:34 UTC
Finding all special cases would require a package/namespace list from a running task. Any solution finding the basic things would be ok as there are very few (if any) code pieces with dynamic dependencies in this project. Try Padre - the free Perl IDE	[reply]
Re: Check if all used modules are use'ed by Tux (Canon) on Oct 27, 2011 at 11:16 UTC
Not the way you describe the wish, but I've had enormous help of Devel::TraceUse which will show - when the program finishes - a list of modules actually loaded with their versions. Enjoy, Have FUN! H.Merijn	[reply]
Re: Check if all used modules are use'ed by CountZero (Bishop) on Oct 27, 2011 at 22:21 UTC
Just run the program through its paces and see if you get any errors. Of course your test suite will discover such errors quickly. I am more worried about modules "`use`"d but never used, because that is a waste of memory, processing power and time. CountZero A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James	[reply] [d/l]
Re^2: Check if all used modules are use'ed by Sewi (Friar) on Oct 28, 2011 at 13:31 UTC
All web scripte are running in a persistant interpreter (mod_perl/FastCGI), every module is used sooner or later. Problems start when a script is called which doesn't use a used module and no other script has pre-loaded (use'd) the module before. Try Padre - the free Perl IDE	[reply]