File-DesktopEntry
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lib/File/DesktopEntry.pm view on Meta::CPAN
package File::DesktopEntry;
use strict;
use warnings;
use vars qw/$AUTOLOAD/;
use Carp;
use Encode;
use File::Spec;
use File::BaseDir 0.03 qw/data_files data_home/;
use URI::Escape;
our $VERSION = '0.23';
our $VERBOSE = 0;
if ($^O eq 'MSWin32') {
eval q/use Win32::Process/;
die $@ if $@;
}
=head1 NAME
File::DesktopEntry - Object to handle .desktop files
=head1 SYNOPSIS
use File::DesktopEntry;
my $entry = File::DesktopEntry->new('firefox');
print "Using ".$entry->Name." to open http://perl.org\n";
$entry->run('http://perl.org');
=head1 DESCRIPTION
This module is designed to work with F<.desktop> files. The format of these files
is specified by the freedesktop "Desktop Entry" specification. This module can
parse these files but also knows how to run the applications defined by these
files.
For this module version 1.0 of the specification was used.
This module was written to support L<File::MimeInfo::Applications>.
Please remember: case is significant for the names of Desktop Entry keys.
=head1 VARIABLES
You can set the global variable C<$File::DesktopEntry::VERBOSE>. If set the
module prints a warning every time a command gets executed.
The global variable C<$File::DesktopEntry::LOCALE> tells you what the default
locale being used is. However, changing it will not change the default locale.
=head1 AUTOLOAD
All methods that start with a capital are autoloaded as C<get(KEY)> where
key is the autoloaded method name.
=head1 METHODS
=over 4
=item C<new(FILE)>
=item C<new(\$TEXT)>
=item C<new(NAME)>
Constructor. FILE, NAME or TEXT are optional arguments.
When a name is given (a string without 'C</>', 'C<\>' or 'C<.>') a lookup is
done using File::BaseDir. If the file found in this lookup is not writable or
if no file was found, the XDG_DATA_HOME path will be used when writing.
=cut
our $LOCALE = 'C';
# POSIX setlocale(LC_MESSAGES) not supported on all platforms
# so we do it ourselves ...
# string might look like lang_COUNTRY.ENCODING@MODIFIER
for (qw/LC_ALL LC_MESSAGES LANGUAGE LANG/) {
next unless $ENV{$_};
$LOCALE = $ENV{$_};
last;
}
our $_locale = _parse_lang($LOCALE);
sub new {
my ($class, $file) = @_;
my $self = bless {}, $class;
if (! defined $file) { # initialize new file
$self->set(Version => '1.0', Encoding => 'UTF-8');
}
elsif (ref $file) { $self->read($file) } # SCALAR
elsif ($file =~ /[\/\\\.]/) { $$self{file} = $file } # file
else {
$$self{file} = $class->lookup($file); # name
$$self{name} = $file;
}
return $self;
}
sub AUTOLOAD {
$AUTOLOAD =~ s/.*:://;
return if $AUTOLOAD eq 'DESTROY';
croak "No such method: File::DesktopEntry::$AUTOLOAD"
unless $AUTOLOAD =~ /^[A-Z][A-Za-z0-9-]+$/;
return $_[0]->get($AUTOLOAD);
}
=item C<lookup(NAME)>
Returns a filename for a desktop entry with desktop file id NAME.
=cut
sub lookup {
my (undef, $name) = @_;
$name .= '.desktop';
my $file = data_files('applications', $name);
if (! $file and $name =~ /-/) {
# name contains "-" and was not found
my @name = split /-/, $name;
$file = data_files('applications', @name);
}
return $file;
}
sub _parse_lang {
# lang might look like lang_COUNTRY.ENCODING@MODIFIER
my $lang = shift;
return '' if !$lang or $lang eq 'C' or $lang eq 'POSIX';
$lang =~ m{^
([^_@\.]+) # lang $1
(?: _ ([^@\.]+) )? # COUNTRY $2
(?: \. [^@]+ )? # ENCODING
(?: \@ (.+) )? # MODIFIER $3
$}x or return '';
my ($l, $c, $m) = ($1, $2, $3);
my @locale = (
$l,
($m ? "$l\@$m" : ()),
($c ? "$l\_$c" : ()),
(($m && $c) ? "$l\_$c\@$m" : ()) );
return join '|', reverse @locale;
}
=item C<wants_uris( )>
Returns true if the Exec string for this desktop entry specifies that the
application uses URIs instead of paths. This can be used to determine
whether an application uses a VFS library.
=item C<wants_list( )>
Returns true if the Exec string for this desktop entry specifies that the
application can handle multiple arguments at once.
=cut
sub wants_uris {
my $self = shift;
my $exec = $self->get('Exec');
croak "No Exec string defined for desktop entry" unless length $exec;
$exec =~ s/\%\%//g;
return $exec =~ /\%U/i;
}
sub wants_list {
my $self = shift;
my $exec = $self->get('Exec');
croak "No Exec string defined for desktop entry" unless length $exec;
$exec =~ s/\%\%//g;
return $exec !~ /\%[fud]/; # we default to %F if no /\%[FUD]/i is found
}
=item C<run(@FILES)>
Forks and runs the application specified in this Desktop Entry
with arguments FILES as a background process. Returns the pid.
The child process fails when this is not a Desktop Entry of type Application
or if the Exec key is missing or invalid.
If the desktop entry specifies that the program needs to be executed in a
terminal the $TERMINAL environment variable is used. If this variable is not
set C<xterm -e> is used as default.
(On Windows this method returns a L<Win32::Process> object.)
=item C<system(@FILES)>
Like C<run()> but using the C<system()> system call.
It only return after the application has ended.
=item C<exec(@FILES)>
Like C<run()> but using the C<exec()> system call. This method
is expected not to return but to replace the current process with the
application you try to run.
On Windows this method doesn't always work the way you want it to
due to the C<fork()> emulation on this platform. Try using C<run()> or
C<system()> instead.
=cut
sub run {
my $pid = fork;
return $pid if $pid; # parent process
unshift @_, 'exec'; goto \&_run;
}
sub system { unshift @_, 'system'; goto \&_run }
sub exec { unshift @_, 'exec'; goto \&_run }
sub _run {
my $call = shift;
my $self = shift;
croak "Desktop entry is not an Application"
unless $self->get('Type') eq 'Application';
my @exec = $self->parse_Exec(@_);
my $t = $self->get('Terminal');
if ($t and $t eq 'true') {
my $term = $ENV{TERMINAL} || 'xterm -e';
unshift @exec, _split($term);
}
my $cwd;
if (my $path = $self->get('Path')) {
require Cwd;
$cwd = Cwd::getcwd();
chdir $path or croak "Could not change to dir: $path";
$ENV{PWD} = $path;
warn "Running from directory: $path\n" if $VERBOSE;
}
warn "Running: "._quote(@exec)."\n" if $VERBOSE;
if ($call eq 'exec') { CORE::exec {$exec[0]} @exec; exit 1 }
else { CORE::system {$exec[0]} @exec }
warn "Error: $!\n" if $VERBOSE and $?;
if (defined $cwd) {
chdir $cwd or croak "Could not change back to dir: $cwd";
$ENV{PWD} = $cwd;
}
}
=item C<parse_Exec(@FILES)>
Expands the Exec format in this desktop entry with. Returns a properly quoted
string in scalar context or a list of words in list context. Dies when the
Exec key is invalid.
It supports the following fields:
%f single file
%F multiple files
%u single url
%U multiple urls
%i Icon field prefixed by --icon
%c Name field, possibly translated
%k location of this .desktop file
%% literal '%'
If necessary this method tries to convert between paths and URLs but this
is not perfect.
Fields that are deprecated, but (still) supported by this module:
%d single directory
%D multiple directories
The fields C<%n>, C<%N>, C<%v> and C<%m> are deprecated and will cause a
warning if C<$VERBOSE> is used. Any other unknown fields will cause an error.
The fields C<%F>, C<%U>, C<%D> and C<%i> can only occur as separate words
because they expand to multiple arguments.
Also see L</LIMITATIONS>.
=cut
sub parse_Exec {
my ($self, @argv) = @_;
my @format = _split( $self->get('Exec') );
# Check format
my $seen = 0;
for (@format) {
my $s = $_; # copy;
$s =~ s/\%\%//g;
$seen += ($s =~ /\%[fFuUdD]/);
die "Exec key for '".$self->get('Name')."' contains " .
"'\%F\', '\%U' or '\%D' at the wrong place\n"
if $s !~ /^\%[FUD]$/ and $s =~ /\%[FUD]/;
die "Exec key for '".$self->get('Name')."' contains " .
"unknown field code '$1'\n"
if $s =~ /(\%[^fFuUdDnNickvm])/;
croak "Application '".$self->get('Name')."' ".
"takes only one argument"
if @argv > 1 and $s =~ /\%[fud]/;
warn "Exec key for '".$self->get('Name')."' contains " .
"deprecated field codes\n"
if $VERBOSE and $s =~ /%([nNvm])/;
}
if ($seen == 0) { push @format, '%F' }
elsif ($seen > 1) {
# not allowed according to the spec
warn "Exec key for '".$self->get('Name')."' contains " .
"multiple fields for files or uris.\n"
}
# Expand format
my @exec;
for (@format) {
if (/^\%([FUD])$/) {
push @exec,
lib/File/DesktopEntry.pm view on Meta::CPAN
else {
open $fh, '<', $file or croak "Could not open SCALAR ref !?";
}
binmode $fh, ':utf8';
$self->read_fh($fh);
close $fh;
}
sub read_fh {
my ($self, $fh) = @_;
$$self{groups} = [];
# Read groups
my $group = '';
while (my $l = <$fh>) {
$l =~ s/\r?\n$/\n/; # DOS to Unix conversion
if ($l =~ /^\[(.*?)\]\s*$/) {
push @{$$self{groups}}, $group
if length $group;
$group = '';
}
$group .= $l;
}
push @{$$self{groups}}, $group;
s/\n\n$/\n/ for @{$$self{groups}}; # remove last empty line
# Some checks
for (qw/Name Type/) {
carp "Required key missing in Desktop Entry: $_"
unless defined $self->get($_);
}
my $enc = $self->get('Encoding');
carp "Desktop Entry uses unsupported encoding: $enc"
if $enc and $enc ne 'UTF-8';
}
=item C<write(FILE)>
Write the Desktop Entry data to FILE. Without arguments it writes to
the filename given to the constructor if any.
The keys Name and Type are required. Type can be either C<Application>,
C<Link> or C<Directory>. For an application set the optional key C<Exec>. For
a link set the C<URL> key.
=cut
# Officially we should check lines end with LF - this is \n on Unix
# but on Windows \n is CR LF, which breaks the spec
sub write {
my $self = shift;
my $file = shift || $$self{file};
unless ($$self{groups}) {
if ($$self{file}) { $self->read() }
else { croak "Can not write empty Desktop Entry file" }
}
# Check keys
for (qw/Name Type/) {
croak "Can not write a desktop file without a $_ field"
unless defined $self->get($_);
}
$self->set(Version => '1.0', Encoding => 'UTF-8');
# Check file writable
$file = $self->_data_home_file
if (! $file or ! -w $file) and defined $$self{name};
croak "No file given for writing Desktop Entry" unless length $file;
# Write file
s/\n?$/\n/ for @{$$self{groups}}; # just to be sure
open OUT, ">$file" or die "Could not write file: $file\n";
binmode OUT, ':utf8' unless $] < 5.008;
print OUT join "\n", @{$$self{groups}};
close OUT;
}
sub _data_home_file {
# create new file name in XDG_DATA_HOME from name
my $self = shift;
my @parts = split /-/, $$self{name};
$parts[-1] .= '.desktop';
my $dir = data_home('applications', @parts[0 .. $#parts-1]);
unless (-d $dir) { # create dir if it doesn't exist
require File::Path;
File::Path::mkpath($dir);
}
return data_home('applications', @parts);
}
=back
=head2 Backwards Compatibility
Methods supported for backwards compatibility with 0.02.
=over 4
=item C<new_from_file(FILE)>
Alias for C<new(FILE)>.
=item C<new_from_data(TEXT)>
Alias for C<new(\$TEXT)>.
=item C<get_value(NAME, GROUP, LANG)>
Identical to C<get(GROUP, "NAME[LANG]")>.
LANG defaults to 'C', GROUP is optional.
=cut
sub new_from_file { $_[0]->new($_[1]) }
sub new_from_data { $_[0]->new(\$_[1]) }
sub get_value {
my ($self, $key, $group, $locale) = @_;
$locale ||= 'C';
$key .= "[$locale]";
$group ? $self->get($group, $key) : $self->get($key);
}
=back
=head1 NON-UNIX PLATFORMS
This module has a few bits of code to make it work on Windows. It handles
C<file://> uri a bit different and it uses L<Win32::Process>. On other
platforms your mileage may vary.
Please note that the specification is targeting Unix platforms only and
will only have limited relevance on other platforms. Any platform-dependent
behavior in this module should be considered an extension of the spec.
=cut
if ($^O eq 'MSWin32') {
# Re-define some modules - I assume this block gets optimized away by the
# interpreter when not running on windows.
no warnings;
lib/File/DesktopEntry.pm view on Meta::CPAN
}
my $dir = $self->get('Path') || '.';
if ($VERBOSE) {
warn "Running from directory: $dir" unless $dir eq '.';
warn "Running: $cmd\n";
}
my $obj;
eval {
Win32::Process::Create(
$obj, $bin, $cmd, 0, &NORMAL_PRIORITY_CLASS, $dir );
};
warn $@ if $@;
return $obj;
};
}
1;
__END__
=head1 LIMITATIONS
If you try to exec a remote file with an application that can only handle files
on the local file system we should -according to the spec- download the file to
a temp location. This is not supported. Use the C<wants_uris()> method to check
if an application supports urls.
The values of the various Desktop Entry keys are not parsed (except for the
Exec key). This means that booleans will be returned as the strings "true" and
"false" and lists will still be ";" separated.
If the icon is given as name and not as path it should be resolved for the C<%i>
code in the Exec key. We need a separate module for the icon spec to deal with
this.
According to the spec comments can contain any encoding. However since this
module read files as utf8, invalid UTF-8 characters in a comment will cause
an error.
There is no support for Legacy-Mixed Encoding. Everybody is using utf8 now
... right ?
=head1 AUTHOR
Jaap Karssenberg (Pardus) E<lt>pardus@cpan.orgE<gt>
Maintained by Michiel Beijen E<lt>michielb@cpan.orgE<gt>
Copyright (c) 2005, 2007 Jaap G Karssenberg. All rights reserved.
=head1 LICENSE
This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.
=head1 SEE ALSO
L<http://standards.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html>
L<File::BaseDir> and L<File::MimeInfo::Applications>
L<X11::FreeDesktop::DesktopEntry>
=cut
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