NAME

ExtUtils::InstallPaths - Build.PL install path logic made easy

VERSION

version 0.012

SYNOPSIS

 use ExtUtils::InstallPaths;
 use ExtUtils::Install 'install';
 GetOptions(\my %opt, 'install_base=s', 'install_path=s%', 'installdirs=s', 'destdir=s', 'prefix=s', 'uninst:1', 'verbose:1');
 my $paths = ExtUtils::InstallPaths->new(%opt, dist_name => $dist_name);
 install($paths->install_map, $opt{verbose}, 0, $opt{uninst});

DESCRIPTION

This module tries to make install path resolution as easy as possible.

When you want to install a module, it needs to figure out where to install things. The nutshell version of how this works is that default installation locations are determined from ExtUtils::Config, and they may be individually overridden by using the "install_path" attribute. An "install_base" attribute lets you specify an alternative installation root like /home/foo and "prefix" does something similar in a rather different (and more complicated) way. "destdir" lets you specify a temporary installation directory like /tmp/install in case you want to create bundled-up installable packages.

The following types are supported by default.

lib
Usually pure-Perl module files ending in .pm or .pod.
arch
"Architecture-dependent" module files, usually produced by compiling XS, Inline, or similar code.
script
Programs written in pure Perl. In order to improve reuse, you may want to make these as small as possible - put the code into modules whenever possible.
bin
"Architecture-dependent" executable programs, i.e. compiled C code or something. Pretty rare to see this in a perl distribution, but it happens.
bindoc
Documentation for the stuff in "script" and "bin". Usually generated from the POD in those files. Under Unix, these are manual pages belonging to the 'man1' category. Unless explicitly set, this is only available on platforms supporting manpages.
libdoc
Documentation for the stuff in "lib" and "arch". This is usually generated from the POD in .pm and .pod files. Under Unix, these are manual pages belonging to the 'man3' category. Unless explicitly set, this is only available on platforms supporting manpages.
binhtml
This is the same as "bindoc" above, but applies to HTML documents. Unless explicitly set, this is only available when perl was configured to do so.
libhtml
This is the same as "libdoc" above, but applies to HTML documents. Unless explicitly set, this is only available when perl was configured to do so.

ATTRIBUTES

installdirs

The default destinations for these installable things come from entries in your system's configuration. You can select from three different sets of default locations by setting the "installdirs" parameter as follows:

                          'installdirs' set to:
                   core          site                vendor

              uses the following defaults from ExtUtils::Config:

  lib     => installprivlib  installsitelib      installvendorlib
  arch    => installarchlib  installsitearch     installvendorarch
  script  => installscript   installsitescript   installvendorscript
  bin     => installbin      installsitebin      installvendorbin
  bindoc  => installman1dir  installsiteman1dir  installvendorman1dir
  libdoc  => installman3dir  installsiteman3dir  installvendorman3dir
  binhtml => installhtml1dir installsitehtml1dir installvendorhtml1dir [*]
  libhtml => installhtml3dir installsitehtml3dir installvendorhtml3dir [*]

  * Under some OS (eg. MSWin32) the destination for HTML documents is determined by the C<Config.pm> entry C<installhtmldir>.

The default value of "installdirs" is "site".

install_base

You can also set the whole bunch of installation paths by supplying the "install_base" parameter to point to a directory on your system. For instance, if you set "install_base" to "/home/ken" on a Linux system, you'll install as follows:

  lib     => /home/ken/lib/perl5
  arch    => /home/ken/lib/perl5/i386-linux
  script  => /home/ken/bin
  bin     => /home/ken/bin
  bindoc  => /home/ken/man/man1
  libdoc  => /home/ken/man/man3
  binhtml => /home/ken/html
  libhtml => /home/ken/html

prefix

This sets a prefix, identical to ExtUtils::MakeMaker's PREFIX option. This does something similar to "install_base" in a much more complicated way.

config()

The ExtUtils::Config object used for this object.

verbose

The verbosity of ExtUtils::InstallPaths. It defaults to 0

create_packlist

Together with "module_name" this controls whether a packlist will be added; it defaults to 1.

dist_name

The name of the current module.

module_name

The name of the main module of the package. This is required for packlist creation, but in the future it may be replaced by dist_name. It defaults to "dist_name =~ s/-/::/gr" if dist_name is set.

destdir

If you want to install everything into a temporary directory first (for instance, if you want to create a directory tree that a package manager like "rpm" or "dpkg" could create a package from), you can use the "destdir" parameter. E.g. Setting "destdir" to "/tmp/foo" will effectively install to "/tmp/foo/$sitelib", "/tmp/foo/$sitearch", and the like, except that it will use "File::Spec" to make the pathnames work correctly on whatever platform you're installing on.

METHODS

new

Create a new ExtUtils::InstallPaths object. All attributes are valid arguments to the constructor, as well as this:

install_path
This must be a hashref with the type as keys and the destination as values.
install_base_relpaths
This must be a hashref with types as keys and a path relative to the install_base as value.
prefix_relpaths
This must be a hashref any of these three keys: core, vendor, site. Each of the values mush be a hashref with types as keys and a path relative to the prefix as value. You probably want to make these three hashrefs identical.
original_prefix
This must be a hashref with the legal installdirs values as keys and the prefix directories as values.
install_sets
This mush be a hashref with the legal installdirs are keys, and the values being hashrefs with types as keys and locations as values.

install_map()

Return a map suitable for use with ExtUtils::Install. In most cases, this is the only method you'll need.

install_destination($type)

Returns the destination of a certain type.

install_types()

Return a list of all supported install types in the current configuration.

is_default_installable($type)

Given a file type, will return true if the file type would normally be installed when neither install-base nor prefix has been set. I.e. it will be true only if the path is set from the configuration object or set explicitly by the user via install_path.

AUTHORS

Ken Williams <kwilliams@cpan.org>
Leon Timmermans <leont@cpan.org>

COPYRIGHT AND LICENSE

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.