Category: | Miscellaneous |
Author/Contact Info | |
Description: | This traps warnings and prints them summarized instead of in masses. Instead of getting 3542 messages stating "Use of uninitialized value ..." at various lines you get only a few and they list all the lines it happened at and how many times. Updated: The warnings are now displayed in the order they were first seen (they used to be in ascibetical order) and the warning messages are slightly more succinct. Instead of "on line 5 (11 times), line 8" now "on line 5 (x11) and 8". |
package Devel::SummarizedWarnings; use strict; use warnings; our @Warnings; use constant NoSuchLine => 'NoSuchLine'; # Modify this globally BEGIN { my $old_sig = $SIG{'__WARN__'}; $SIG{'__WARN__'} = ref $SIG{'__WARN__'} ? sub { &$old_sig; &append_to_warning_log } : \ &append_to_warning_log; } END { dump_warnings(); } sub append_to_warning_log { push @Warnings, grep +(not ref), @_; } sub dump_warnings { if ( $SIG{'__WARN__'} == \&append_to_warning_log ) { delete $SIG{'__WARN__'}; } else { push @Warnings, __PACKAGE__ . " was disabled prior to summariz +ation\n"; } # Summarize the saved warnings my %order; my %sum; for ( @Warnings ) { my $msg; my $line; if ( not /^(.*) at $0 line (\d+).$/os ) { s/\n$//; $msg = $_; $line = NoSuchLine; } else { $msg = $1; $line = $2; } $sum{$msg}{$line}++; if ( not exists $order{$msg} ) { no warnings 'numeric'; $order{$msg} = 1 + %order; } } @Warnings = (); # Reformat the summarization my @out; for ( sort { $order{$a} <=> $order{$b} } keys %order ) { my $wrn = $sum{$_}; if ( exists $wrn->{+NoSuchLine} ) { push @out, $_ . ( $wrn->{+NoSuchLine} > 1 ? " (x$wrn->{+NoSuchLine})" : '' ); } else { push @out, "$_ on line@{[1 < keys %$wrn ? 's' : '']} " . join( 2 == keys %$wrn ? ' and ' : ', ', map "$_@{[ $wrn->{$_} == 1 ? '' : qq[ (x$wrn->{$_})]]}", sort { $a <=> $b } keys %$wrn ); } } local $, = "\n"; print STDERR @out; } 1; __END__ =head1 NAME Devel::SummarizedWarnings - Causes warnings to be summarized =head1 SYNOPSIS use Devel::SummarizedWarnings; use warnings; for ( 0 .. 10 ) { $k = 0 + undef . $_; } $k = 1 + undef . $_; warn "Seagulls!\n"; produces the output Warning: Use of "undef" without parens is ambiguous on lines 5 and 8 Use of uninitialized value in addition (+) on lines 5 (x11) and 8 Use of uninitialized value in concatenation (.) or string on line 8 Seagulls! instead of Warning: Use of "undef" without parens is ambiguous at w.pl line 5. Warning: Use of "undef" without parens is ambiguous at w.pl line 8. Use of uninitialized value in addition (+) at w.pl line 5. Use of uninitialized value in addition (+) at w.pl line 5. Use of uninitialized value in addition (+) at w.pl line 5. Use of uninitialized value in addition (+) at w.pl line 5. Use of uninitialized value in addition (+) at w.pl line 5. Use of uninitialized value in addition (+) at w.pl line 5. Use of uninitialized value in addition (+) at w.pl line 5. Use of uninitialized value in addition (+) at w.pl line 5. Use of uninitialized value in addition (+) at w.pl line 5. Use of uninitialized value in addition (+) at w.pl line 5. Use of uninitialized value in addition (+) at w.pl line 5. Use of uninitialized value in addition (+) at w.pl line 8. Use of uninitialized value in concatenation (.) or string at w.pl lin +e 8. Seagulls! =head1 DESCRIPTION This module traps all warnings and summarizes them when the your perl +script exits. Warning trapping can be interrupted and resumed by removing/ins +talling the Devel::SummarizedWarnings::append_to_warning_log handler into $SIG{'__WARN__'}. Trapped warnings are stored in @Devel::SummarizedWarnings::Warnings. =head1 AUTHOR Joshua b. Jore E<lt>jjore@cpan.orgE<gt> =cut |
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