320 lines
8.0 KiB
Perl
320 lines
8.0 KiB
Perl
package Xchat::Embed;
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use strict;
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use warnings;
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# list of loaded scripts keyed by their package names
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# The package names are generated from the filename of the script using
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# the file2pkg() function.
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# The values of this hash are hash references with the following keys:
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# filename
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# The full path to the script.
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# gui_entry
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# This is xchat_plugin pointer that is used to remove the script from
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# Plugins and Scripts window when a script is unloaded. This has also
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# been converted with the PTR2IV() macro.
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# hooks
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# This is an array of hooks that are associated with this script.
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# These are pointers that have been converted with the PTR2IV() macro.
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# inner_packages
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# Other packages that are defined in a script. This is not recommended
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# partly because these will also get removed when a script is unloaded.
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# loaded_at
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# A timestamp of when the script was loaded. The value is whatever
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# Time::HiRes::time() returns. This is used to retain load order when
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# using the RELOADALL command.
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# shutdown
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# This is either a code ref or undef. It will be executed just before a
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# script is unloaded.
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our %scripts;
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# This is a mapping of "inner package" => "containing script package"
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our %owner_package;
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# used to keep track of which package a hook belongs to, if the normal way of
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# checking which script is calling a hook function fails this will be used
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# instead. When a hook is created this will be copied to the HookData structure
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# and when a callback is invoked this it will be used to set this value.
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our $current_package;
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sub load {
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my $file = expand_homedir( shift @_ );
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my $package = file2pkg( $file );
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if( exists $scripts{$package} ) {
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my $pkg_info = pkg_info( $package );
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my $filename = File::Basename::basename( $pkg_info->{filename} );
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Xchat::printf(
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qq{'%s' already loaded from '%s'.\n},
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$filename, $pkg_info->{filename}
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);
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Xchat::print(
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'If this is a different script then it rename and try '.
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'loading it again.'
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);
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return 2;
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}
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if( open my $source_handle, $file ) {
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my $source = do {local $/; <$source_handle>};
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close $source_handle;
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# we shouldn't care about things after __END__
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$source =~ s/^__END__.*//ms;
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# this must come before the eval or the filename will not be found in
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# Xchat::register
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$scripts{$package}{filename} = $file;
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$scripts{$package}{loaded_at} = Time::HiRes::time();
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# this must be done before the error check so the unload will remove
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# any inner packages defined by the script. if a script fails to load
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# then any inner packages need to be removed as well.
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my @inner_packages = $source =~
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m/^\s*package \s+
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((?:[^\W:]+(?:::)?)+)\s*? # package name
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# strict version number
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(?:\d+(?:[.]\d+) # positive integer or decimal-fraction
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|v\d+(?:[.]\d+){2,})? # dotted-decimal v-string
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[{;]
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/mgx;
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# check if any inner package defined in the to be loaded script has
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# already been defined by another script
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my @conflicts;
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for my $inner ( @inner_packages ) {
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if( exists $owner_package{ $inner } ) {
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push @conflicts, $inner;
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}
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}
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# report conflicts and bail out
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if( @conflicts ) {
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my $error_message =
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"'$file' won't be loaded due to conflicting inner packages:\n";
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for my $conflict_package ( @conflicts ) {
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$error_message .= " $conflict_package already defined in " .
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pkg_info($owner_package{ $conflict_package })->{filename}."\n";
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}
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Xchat::print( $error_message );
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return 2;
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}
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my $full_path = File::Spec->rel2abs( $file );
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$source =~ s/^/#line 1 "$full_path"\n\x7Bpackage $package;/;
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# make sure we add the closing } even if the last line is a comment
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if( $source =~ /^#.*\Z/m ) {
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$source =~ s/^(?=#.*\Z)/\x7D/m;
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} else {
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$source =~ s/\Z/\x7D/;
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}
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$scripts{$package}{inner_packages} = [ @inner_packages ];
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@owner_package{ @inner_packages } = ($package) x @inner_packages;
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_do_eval( $source );
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unless( exists $scripts{$package}{gui_entry} ) {
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$scripts{$package}{gui_entry} =
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Xchat::Internal::register(
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"", "unknown", "", $file
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);
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}
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if( $@ ) {
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# something went wrong
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$@ =~ s/\(eval \d+\)/$file/g;
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Xchat::print( "Error loading '$file':\n$@\n" );
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# make sure the script list doesn't contain false information
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unload( $scripts{$package}{filename} );
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return 1;
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}
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} else {
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Xchat::print( "Error opening '$file': $!\n" );
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return 2;
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}
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return 0;
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}
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sub _do_eval {
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no strict;
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no warnings;
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eval $_[0];
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}
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sub unload {
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my $file = shift @_;
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my $package = file2pkg( $file );
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my $pkg_info = pkg_info( $package );
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if( $pkg_info ) {
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# take care of the shutdown callback
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if( exists $pkg_info->{shutdown} ) {
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# allow incorrectly written scripts to be unloaded
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eval {
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if( ref $pkg_info->{shutdown} eq 'CODE' ) {
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$pkg_info->{shutdown}->();
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} elsif ( $pkg_info->{shutdown} ) {
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no strict 'refs';
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&{$pkg_info->{shutdown}};
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}
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};
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}
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if( exists $pkg_info->{hooks} ) {
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for my $hook ( @{$pkg_info->{hooks}} ) {
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Xchat::unhook( $hook, $package );
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}
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}
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if( exists $pkg_info->{gui_entry} ) {
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plugingui_remove( $pkg_info->{gui_entry} );
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}
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delete @owner_package{ @{$pkg_info->{inner_packages}} };
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for my $inner_package ( @{$pkg_info->{inner_packages}} ) {
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Symbol::delete_package( $inner_package );
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}
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Symbol::delete_package( $package );
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delete $scripts{$package};
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return Xchat::EAT_ALL;
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} else {
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Xchat::print( qq{"$file" is not loaded.\n} );
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return Xchat::EAT_NONE;
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}
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}
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sub unload_all {
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for my $package ( keys %scripts ) {
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unload( $scripts{$package}->{filename} );
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}
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return Xchat::EAT_ALL;
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}
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sub reload {
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my $file = shift @_;
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my $package = file2pkg( $file );
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my $pkg_info = pkg_info( $package );
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my $fullpath = $file;
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if( $pkg_info ) {
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$fullpath = $pkg_info->{filename};
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unload( $file );
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}
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load( $fullpath );
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return Xchat::EAT_ALL;
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}
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sub reload_all {
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my @dirs = Xchat::get_info( "xchatdirfs" ) || Xchat::get_info( "xchatdir" );
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push @dirs, File::Spec->catdir( $dirs[0], "plugins" );
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for my $dir ( @dirs ) {
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my $auto_load_glob = File::Spec->catfile( $dir, "*.pl" );
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my @scripts = map { $_->{filename} }
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sort { $a->{loaded_at} <=> $b->{loaded_at} } values %scripts;
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push @scripts, File::Glob::bsd_glob( $auto_load_glob );
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my %seen;
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@scripts = grep { !$seen{ $_ }++ } @scripts;
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unload_all();
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for my $script ( @scripts ) {
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if( !pkg_info( file2pkg( $script ) ) ) {
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load( $script );
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}
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}
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}
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}
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sub expand_homedir {
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my $file = shift @_;
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if ( $^O eq "MSWin32" ) {
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$file =~ s/^~/$ENV{USERPROFILE}/;
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} else {
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$file =~ s{^~}{
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(getpwuid($>))[7] || $ENV{HOME} || $ENV{LOGDIR}
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}ex;
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}
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return $file;
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}
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sub file2pkg {
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my $string = File::Basename::basename( shift @_ );
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$string =~ s/\.pl$//i;
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$string =~ s|([^A-Za-z0-9/])|'_'.unpack("H*",$1)|eg;
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return "Xchat::Script::" . $string;
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}
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sub pkg_info {
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my $package = shift @_;
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return $scripts{$package};
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}
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sub find_external_pkg {
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my $level = 1;
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while( my @frame = caller( $level ) ) {
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return @frame if $frame[0] !~ /(?:^IRC$|^Xchat)/;
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$level++;
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}
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}
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sub find_pkg {
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my $level = 1;
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while( my ($package, $file, $line) = caller( $level ) ) {
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return $package if $package =~ /^Xchat::Script::/;
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$level++;
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}
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my $current_package = get_current_package();
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if( defined $current_package ) {
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return $current_package;
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}
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my @frame = find_external_pkg();
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my $location;
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if( $frame[0] or $frame[1] ) {
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my $calling_package = $frame[0];
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if( defined( my $owner = $owner_package{ $calling_package } ) ) {
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return $owner;
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}
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$location = $frame[1] ? $frame[1] : "package $frame[0]";
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$location .= " line $frame[2]";
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} else {
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$location = "unknown location";
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}
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die "Unable to determine which script this hook belongs to. at $location\n";
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}
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sub fix_callback {
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my ($package, $callback) = @_;
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unless( ref $callback ) {
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no strict 'subs';
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$callback = \&{$callback};
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}
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return $callback;
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}
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sub get_current_package {
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return $current_package;
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}
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sub set_current_package {
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my $old_package = $current_package;
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$current_package = shift;
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return $old_package;
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}
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1
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