NAME
File::ShareDir::ProjectDistDir - Simple set-and-forget using of a
'/share' directory in your projects root
VERSION
version 1.000004
SYNOPSIS
package An::Example::Package;
use File::ShareDir::ProjectDistDir;
# during development, $dir will be $projectroot/share
# but once installed, it will be wherever File::Sharedir thinks it is.
my $dir = dist_dir('An-Example')
Project layout requirements:
$project/
$project/lib/An/Example/Package.pm
$project/share/ # files for package 'An-Example' go here.
You can use a directory name other than 'share' ( Assuming you make sure
when you install that, you specify the different directory there also )
as follows:
use File::ShareDir::ProjectDistDir ':all', defaults => {
projectdir => 'templates',
};
METHODS
import
use File::ShareDir::ProjectDistDir (@args);
This uses "Sub::Exporter" to do the heavy lifting, so most usage of this
module can be maximized by understanding that first.
* ":all"
->import( ':all' , .... )
Import both "dist_dir" and "dist_file"
* "dist_dir"
->import('dist_dir' , .... )
Import the dist_dir method
* "dist_file"
->import('dist_file' , .... )
Import the dist_file method
* "projectdir"
->import( .... , projectdir => 'share' )
Specify what the project directory is as a path relative to the base
of your distributions source, and this directory will be used as a
"ShareDir" simulation path for the exported methods *During
development*.
If not specified, the default value 'share' is used.
* "filename"
->import( .... , filename => 'some/path/to/foo.pm' );
Generally you don't want to set this, as its worked out by caller()
to work out the name of the file its being called from. This file's
path is walked up to find the 'lib' element with a sibling of the
name of your "projectdir".
* "distname"
->import( .... , distname => 'somedistname' );
Specifying this argument changes the way the functions are emitted
at *installed "runtime"*, so that instead of taking the standard
arguments File::ShareDir does, the specification of the "distname"
in those functions is eliminated.
i.e:
# without this flag
use File::ShareDir::ProjectDistDir qw( :all );
my $dir = dist_dir('example');
my $file = dist_file('example', 'path/to/file.pm' );
# with this flag
use File::ShareDir::ProjectDistDir ( qw( :all ), distname => 'example' );
my $dir = dist_dir();
my $file = dist_file('path/to/file.pm' );
* "strict"
->import( ... , strict => 1 );
This parameter specifies that all "dist" "sharedirs" will occur
within the "projectdir" directory using the following layout:
<root>/<projectdir>/dist/<DISTNAME>/
As opposed to
<root>/<projectdir>
This means if Heuristics misfire and accidentally find another
distributions "share" directory, it will not pick up on it unless
that "share" directory also has that layout, and will instead revert
to the "installdir" path in @INC
This parameter may become the default option in the future
Specifying this parameter also mandates you MUST declare the
"DISTNAME" value in your file somewhere. Doing otherwise is
considered insanity anyway.
* "defaults"
->import( ... , defaults => {
filename => ....,
projectdir => ....,
});
This is mostly an alternative syntax for specifying "filename" and
"projectdir", which is mostly used internally, and their
corresponding other values are packed into this one.
Sub::Exporter tricks of note.
Make your own sharedir util
package Foo::Util;
sub import {
my ($caller_class, $caller_file, $caller_line ) = caller();
if ( grep { /share/ } @_ ) {
require File::ShareDir::ProjectDistDir;
File::ShareDir::ProjectDistDir->import(
filename => $caller_file,
dist_dir => { distname => 'myproject' , -as => 'share' },
dist_dir => { distname => 'otherproject' , -as => 'other_share' , projectdir => 'share2' },
-into => $caller_class,
);
}
}
....
package Foo;
use Foo::Util qw( share );
my $dir = share();
my $other_dir => other_share();
build_dist_dir
use File::ShareDir::ProjectDirDir ( : all );
# this calls
my $coderef = File::ShareDir::ProjectDistDir->build_dist_dir(
'dist_dir' => {},
{ defaults => { filename => 'path/to/yourcallingfile.pm', projectdir => 'share' } }
);
use File::ShareDir::ProjectDirDir ( qw( :all ), distname => 'example-dist' );
# this calls
my $coderef = File::ShareDir::ProjectDistDir->build_dist_dir(
'dist_dir' => {},
{ distname => 'example-dist', defaults => { filename => 'path/to/yourcallingfile.pm', projectdir => 'share' } }
);
use File::ShareDir::ProjectDirDir
dist_dir => { distname => 'example-dist', -as => 'mydistdir' },
dist_dir => { distname => 'other-dist', -as => 'otherdistdir' };
# This calls
my $coderef = File::ShareDir::ProjectDistDir->build_dist_dir(
'dist_dir',
{ distname => 'example-dist' },
{ defaults => { filename => 'path/to/yourcallingfile.pm', projectdir => 'share' } },
);
my $othercoderef = File::ShareDir::ProjectDistDir->build_dist_dir(
'dist_dir',
{ distname => 'other-dist' },
{ defaults => { filename => 'path/to/yourcallingfile.pm', projectdir => 'share' } },
);
# And leverages Sub::Exporter to create 2 subs in your package.
Generates the exported 'dist_dir' method. In development environments,
the generated method will return a path to the development directories
'share' directory. In non-development environments, this simply returns
"File::ShareDir::dist_dir".
As a result of this, specifying the Distribution name is not required
during development ( unless in "strict" mode ), however, it will start
to matter once it is installed. This is a potential avenues for bugs if
you happen to name it wrong.
In "strict" mode, the distribution name is ALWAYS REQUIRED, either at
least at "import" or "dist_dir()" time.
build_dist_file
use File::ShareDir::ProjectDirDir ( : all );
# this calls
my $coderef = File::ShareDir::ProjectDistDir->build_dist_file(
'dist_file' => {},
{ defaults => { filename => 'path/to/yourcallingfile.pm', projectdir => 'share' } }
);
use File::ShareDir::ProjectDirDir ( qw( :all ), distname => 'example-dist' );
# this calls
my $coderef = File::ShareDir::ProjectDistDir->build_dist_file(
'dist_file' => {},
{ distname => 'example-dist', defaults => { filename => 'path/to/yourcallingfile.pm', projectdir => 'share' } }
);
use File::ShareDir::ProjectDirDir
dist_file => { distname => 'example-dist', -as => 'mydistfile' },
dist_file => { distname => 'other-dist', -as => 'otherdistfile' };
# This calls
my $coderef = File::ShareDir::ProjectDistDir->build_dist_file(
'dist_file',
{ distname => 'example-dist' },
{ defaults => { filename => 'path/to/yourcallingfile.pm', projectdir => 'share' } },
);
my $othercoderef = File::ShareDir::ProjectDistDir->build_dist_file(
'dist_file',
{ distname => 'other-dist' },
{ defaults => { filename => 'path/to/yourcallingfile.pm', projectdir => 'share' } },
);
# And leverages Sub::Exporter to create 2 subs in your package.
Generates the 'dist_file' method.
In development environments, the generated method will return a path to
the development directories 'share' directory. In non-development
environments, this simply returns "File::ShareDir::dist_file".
Caveats as a result of package-name as stated in "build_dist_dir" also
apply to this method.
SIGNIFICANT CHANGES
1.000000
Strict Mode.
Using Strict Mode
use File::ShareDir::ProjectDistDir ':all', strict => 1;
use File::ShareDir::ProjectDistDir 'dist_dir' => { defaults => { strict => 1 }};
Why you should use strict mode
Starting with 1.000000, there is a parameter "strict" that changes how
"sharedir" resolution performs.
Without strict:
lib/...
share/...
With strict
lib/...
share/dist/Dist-Name-Here/...
This technique greatly builds resilience to the long standing problem
with "develop" vs "install" heuristic ambiguity.
Here at least,
dist_dir('Dist-Name')
Will instead fall back to
@INC/auto/share/dist/Dist-Name
When
share/dist/Dist-Name
Does not exist.
This means if you have a layout like this:
<DEVROOT>/inc/<a local::lib path here>
<DEVROOT>/lib/<development files here>
Then when "Foo-Bar-Baz" is installed as:
<DEVROOT>/inc/lib/Foo/Bar/Baz.pm
<DEVROOT>/inc/lib/auto/share/dist/Foo-Bar-Baz
Then "Baz.pm" will not see the "DEVROOT" and assume "Hey, this is
development" and then proceed to try finding files in "DEVROOT/share"
Instead, "DEVROOT" must have "DEVROOT/share/dist/Foo-Bar-Baz" too,
otherwise it reverts to "DEVROOT/inc/lib/auto..."
"Path::Class" interfaces deprecated and dependency dropped.
If you have any dependence on this function, now is the time to get
yourself off it.
Minimum Changes to stay with "Path::Class" short term.
As the dependency has been dropped on "Path::Class", if you have "CPAN"
modules relying on "Path::Class" interface, you should now at a very
minimum start declaring
{ requires => "Path::Class" }
This will keep your dist working, but will not be future proof against
further changes.
Staying with "Path::Class" long term.
Recommended approach if you want to stay using the "Path::Class"
interface:
use File::ShareDir::... etc
use Path::Class qw( dir file );
my $dir = dir( dist_dir('Dist-Name') );
This should future-proof you against anything File::ShareDir may do in
the future.
"Versioning Scheme arbitrary converted to float"
This change is a superficial one, and should have no bearing on how
significant you think this release is.
It is a significant release, but the primary reason for the version
change is simply to avoid compatibility issues in *versions themselves*.
However, outside that, "x.y.z" semantics are still intended to be
semi-meaningful, just with less "." and more 0 ☺
"dev" path determination now deferred to call time instead of "use"
This was essentially a required change to make "strict" mode plausible,
because strict mode _requires_ the "distname" to be known, even in the
development environment.
This should not have any user visible effects, but please, if you have
any problems, file a bug.
"file" component determination wrested from "File::ShareDir".
dist_file('foo','bar')
Is now simply sugar syntax for
path(dist_dir('foo'))->child('bar')
This should have no side effects in your code, but please file any bugs
you experience.
( return value is still "undef" if the file does not exist, and still
"croak"'s if the file is not a file, or unreadable, but these may both
be subject to change )
0.5.0 - Heuristics and Return type changes
New "devdir" heuristic
Starting with 0.5.0, instead of using our simple "lib/../share" pattern
heuristic, a more advanced heuristic is used from the new
"Path::FindDev" and "Path::IsDev".
This relies on a more "concrete" marker somewhere at the top of your
development tree, and more importantly, checks for the existence of
specific files that are not likely to occur outside a project root.
"lib" and "share" based heuristics were a little fragile, for a few
reasons:
* "lib" can, and does appear all over UNIX file systems, for purposes
other than development project roots.
For instance, have a look in "/usr/"
/usr/bin
/usr/lib
/usr/share ## UHOH.
This would have the very bad side effect of anything installed in
"/usr/lib" thinking its "in development".
Fortunately, nobody seems to have hit this specific bug, which I
suspect is due only to "/usr/lib" being a symbolic link on most
x86_64 systems.
* "lib" is also reasonably common within "CPAN" package names.
For instance:
lib::abs
Which means you'll have a hierarchy like:
$PREFIX/lib/lib/abs
All you need for something to go horribly wrong would be for
somebody to install a "CPAN" module named:
share::mystuff
Or similar, and instantly, you have:
$PREFIX/lib/lib/
$PREFIX/lib/share/
Which would mean any module calling itself "lib::*" would be unable
to use this module.
So instead, as of 0.5.0, the heuristic revolves around certain specific
files being in the "dev" directory.
Which is hopefully a more fault resilient mechanism.
New Return Types
Starting with 0.5.0, the internals are now based on "Path::Tiny" instead
of "Path::Class", and as a result, there may be a few glitches in
transition.
Also, previously you could get a "Path::Class::*" object back from
"dist_dir" and "dist_file" by importing it as such:
use File::ShareDir::ProjectDistDir
qw( dist_dir dist_file ),
defaults => { pathclass => 1 };
Now you can also get "Path::Tiny" objects back, by passing:
use File::ShareDir::ProjectDistDir
qw( dist_dir dist_file ),
defaults => { pathtiny => 1 };
For the time being, you can still get Path::Class objects back, it is
deprecated since 1.000000
( In fact, I may even make 2 specific sub-classes of "PDD" for people
who want objects back, as it will make the "API" and the code much
cleaner )
AUTHOR
Kent Fredric <kentnl@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2014 by Kent Fredric <kentnl@cpan.org>.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.