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.\" ========================================================================
.\"
.IX Title "App::Cpan 3perl"
.TH App::Cpan 3perl "2011-09-26" "perl v5.14.2" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
App::Cpan \- easily interact with CPAN from the command line
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 2
\&        # with arguments and no switches, installs specified modules
\&        cpan module_name [ module_name ... ]
\&
\&        # with switches, installs modules with extra behavior
\&        cpan [\-cfFimt] module_name [ module_name ... ]
\&
\&        # use local::lib
\&        cpan \-l module_name [ module_name ... ]
\&        
\&        # with just the dot, install from the distribution in the
\&        # current directory
\&        cpan .
\&        
\&        # without arguments, starts CPAN.pm shell
\&        cpan
\&
\&        # without arguments, but some switches
\&        cpan [\-ahruvACDLO]
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This script provides a command interface (not a shell) to \s-1CPAN\s0. At the
moment it uses \s-1CPAN\s0.pm to do the work, but it is not a one-shot command
runner for \s-1CPAN\s0.pm.
.SS "Options"
.IX Subsection "Options"
.IP "\-a" 4
.IX Item "-a"
Creates a \s-1CPAN\s0.pm autobundle with CPAN::Shell\->autobundle.
.IP "\-A module [ module ... ]" 4
.IX Item "-A module [ module ... ]"
Shows the primary maintainers for the specified modules.
.IP "\-c module" 4
.IX Item "-c module"
Runs a `make clean` in the specified module's directories.
.IP "\-C module [ module ... ]" 4
.IX Item "-C module [ module ... ]"
Show the \fIChanges\fR files for the specified modules
.IP "\-D module [ module ... ]" 4
.IX Item "-D module [ module ... ]"
Show the module details. This prints one line for each out-of-date module
(meaning, modules locally installed but have newer versions on \s-1CPAN\s0).
Each line has three columns: module name, local version, and \s-1CPAN\s0
version.
.IP "\-f" 4
.IX Item "-f"
Force the specified action, when it normally would have failed. Use this
to install a module even if its tests fail. When you use this option,
\&\-i is not optional for installing a module when you need to force it:
.Sp
.Vb 1
\&        % cpan \-f \-i Module::Foo
.Ve
.IP "\-F" 4
.IX Item "-F"
Turn off \s-1CPAN\s0.pm's attempts to lock anything. You should be careful with 
this since you might end up with multiple scripts trying to muck in the
same directory. This isn't so much of a concern if you're loading a special
config with \f(CW\*(C`\-j\*(C'\fR, and that config sets up its own work directories.
.IP "\-g module [ module ... ]" 4
.IX Item "-g module [ module ... ]"
Downloads to the current directory the latest distribution of the module.
.IP "\-G module [ module ... ]" 4
.IX Item "-G module [ module ... ]"
\&\s-1UNIMPLEMENTED\s0
.Sp
Download to the current directory the latest distribution of the
modules, unpack each distribution, and create a git repository for each
distribution.
.Sp
If you want this feature, check out Yanick Champoux's \f(CW\*(C`Git::CPAN::Patch\*(C'\fR
distribution.
.IP "\-h" 4
.IX Item "-h"
Print a help message and exit. When you specify \f(CW\*(C`\-h\*(C'\fR, it ignores all
of the other options and arguments.
.IP "\-i" 4
.IX Item "-i"
Install the specified modules.
.IP "\-j Config.pm" 4
.IX Item "-j Config.pm"
Load the file that has the \s-1CPAN\s0 configuration data. This should have the
same format as the standard \fICPAN/Config.pm\fR file, which defines 
\&\f(CW$CPAN::Config\fR as an anonymous hash.
.IP "\-J" 4
.IX Item "-J"
Dump the configuration in the same format that \s-1CPAN\s0.pm uses. This is useful
for checking the configuration as well as using the dump as a starting point
for a new, custom configuration.
.IP "\-l" 4
.IX Item "-l"
Use \f(CW\*(C`local::lib\*(C'\fR.
.IP "\-L author [ author ... ]" 4
.IX Item "-L author [ author ... ]"
List the modules by the specified authors.
.IP "\-m" 4
.IX Item "-m"
Make the specified modules.
.IP "\-O" 4
.IX Item "-O"
Show the out-of-date modules.
.IP "\-t" 4
.IX Item "-t"
Run a `make test` on the specified modules.
.IP "\-r" 4
.IX Item "-r"
Recompiles dynamically loaded modules with CPAN::Shell\->recompile.
.IP "\-u" 4
.IX Item "-u"
Upgrade all installed modules. Blindly doing this can really break things,
so keep a backup.
.IP "\-v" 4
.IX Item "-v"
Print the script version and \s-1CPAN\s0.pm version then exit.
.SS "Examples"
.IX Subsection "Examples"
.Vb 2
\&        # print a help message
\&        cpan \-h
\&
\&        # print the version numbers
\&        cpan \-v
\&
\&        # create an autobundle
\&        cpan \-a
\&
\&        # recompile modules
\&        cpan \-r
\&
\&        # upgrade all installed modules
\&        cpan \-u
\&
\&        # install modules ( sole \-i is optional )
\&        cpan \-i Netscape::Booksmarks Business::ISBN
\&
\&        # force install modules ( must use \-i )
\&        cpan \-fi CGI::Minimal URI
.Ve
.SS "Methods"
.IX Subsection "Methods"
.IP "\fIrun()\fR" 4
.IX Item "run()"
Just do it.
.Sp
The \f(CW\*(C`run\*(C'\fR method returns 0 on success and a postive number on 
failure. See the section on \s-1EXIT\s0 \s-1CODES\s0 for details on the values.
.Sp
\&\s-1CPAN\s0.pm sends all the good stuff either to \s-1STDOUT\s0. I have to intercept
that output so I can find out what happened.
.SH "EXIT VALUES"
.IX Header "EXIT VALUES"
The script exits with zero if it thinks that everything worked, or a 
positive number if it thinks that something failed. Note, however, that
in some cases it has to divine a failure by the output of things it does
not control. For now, the exit codes are vague:
.PP
.Vb 1
\&        1       An unknown error
\&
\&        2       The was an external problem
\&
\&        4       There was an internal problem with the script
\&
\&        8       A module failed to install
.Ve
.SH "TO DO"
.IX Header "TO DO"
* There is initial support for Log4perl if it is available, but I
haven't gone through everything to make the NullLogger work out
correctly if Log4perl is not installed.
.PP
* When I capture \s-1CPAN\s0.pm output, I need to check for errors and
report them to the user.
.SH "BUGS"
.IX Header "BUGS"
* none noted
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Most behaviour, including environment variables and configuration,
comes directly from \s-1CPAN\s0.pm.
.SH "SOURCE AVAILABILITY"
.IX Header "SOURCE AVAILABILITY"
This code is in Github:
.PP
.Vb 1
\&        git://github.com/briandfoy/cpan_script.git
.Ve
.SH "CREDITS"
.IX Header "CREDITS"
Japheth Cleaver added the bits to allow a forced install (\-f).
.PP
Jim Brandt suggest and provided the initial implementation for the
up-to-date and Changes features.
.PP
Adam Kennedy pointed out that \fIexit()\fR causes problems on Windows
where this script ends up with a .bat extension
.SH "AUTHOR"
.IX Header "AUTHOR"
brian d foy, \f(CW\*(C`<bdfoy@cpan.org>\*(C'\fR
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c) 2001\-2009, brian d foy, All Rights Reserved.
.PP
You may redistribute this under the same terms as Perl itself.