Resurrect cpanget as a symlink to cpanspec

- Update the POD in cpanspec to document its use as cpanget
- Subclass Module::Build to create the symlinks to cpanspec and
  cpanspec.1p at build time.

Build.PL

@@ -2,7 +2,22 @@ use strict;
 use warnings;
 use Module::Build;
 
-my $builder = Module::Build->new(
+my $class = Module::Build->subclass(
+    class => 'CpanSpec::Build',
+    code => q{
+        use File::Basename qw(dirname);
+        use FindBin;
+
+        sub ACTION_build {
+            my $self = shift;
+            $self->SUPER::ACTION_build(@_);
+            symlink("cpanspec", "$FindBin::Bin/blib/script/cpanget");
+            symlink("cpanspec.1p", "$FindBin::Bin/blib/bindoc/cpanget.1p");
+        }
+    }
+);
+
+my $builder = $class->new(
     dist_name           => 'cpanspec',
     license             => 'perl',
     dist_author         => 'Steven Pritchard <steve@cpan.org>',

TODO

@@ -4,6 +4,3 @@
   hard-coding $pkgdetails.
 
 * Add an option to honor %_sourcedir and such.
-
-* Install cpanspec as cpanget (with a symlink?) also.
-  - Also need to add a man page for cpanget.

cpanspec

@@ -19,9 +19,13 @@ our $VERSION='1.79';
 
 cpanspec - Generate a spec file for a CPAN module
 
+cpanget - Download a CPAN module
+
 =head1 SYNOPSIS
 
-cpanspec [options] [file [...]]
+cpanspec [options] [module [...]]
+
+cpanget [options] [module [...]]
 
  Options:
    --help       -h      Help message
@@ -39,6 +43,7 @@ cpanspec [options] [file [...]]
    --cpan       -c      CPAN mirror URL
    --verbose    -v      Be more verbose
    --prefer-macros  -m  Prefer macros over environment variables in the spec
+   --download-only  -D  Only download the tarball from CPAN
 
  Long options:
    --follow             Process build dependencies
@@ -49,11 +54,25 @@ cpanspec [options] [file [...]]
    --add-buildrequires  Add BuildRequires for this item
    --version            Print the version number and exit
 
+The modules specified on the command line can be either filenames of tarballs,
+or module names as downloadable from CPAN.
+
+=head1 EXAMPLES
+
+cpanspec Linux::Prctl
+
+cpanspec ~/downloads/Acme-MetaSyntactic-0.99.tar.gz
+
+cpanget Module::Build
+
 =head1 DESCRIPTION
 
 B<cpanspec> will generate a spec file to build a rpm from a CPAN-style
 Perl module distribution.
 
+B<cpanget> will download the tarball for a module from CPAN. This
+implies --download-only and ignores most other options.
+
 =head1 OPTIONS
 
 =over 4
@@ -135,7 +154,9 @@ semi-standard (for Fedora) string C<%{?dist}>.
 
 =item B<-D>, B<--download-only>
 
-Only download the upstream tarball, do not generate a specfile
+Only download the upstream tarball, do not generate a specfile. Most
+other options are ignored as they are only relevant when creating a
+specfile or building a package.
 
 =item B<-s>, B<--srpm>