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( [id://3333]=superdoc: print w/replies, xml ) Need Help??
Ok, try this. It's not guaranteed to work, but it should be better than trying to brave the multi-line problem from above.
package LineDebug; $LOADED = 0; $insert = qq<print "\\tDEBUG: " . __LINE__ . "\\n";\n>; sub import { return if $LOADED++; my $freq = (@_ == 3 && pop) || 1; my ($file) = (caller)[1]; my $code; open PROG, $file; while (<PROG>) { $code .= $_; if ($freq == 1) { next unless /\S/; $code =~ s/;\s*\n\z/; $insert/; } elsif ($. % $freq == 0) { if (!/\S/) { $code =~ s/\n\z/; $insert/ } else { $code =~ s/:;\s*\n\z/; $insert/ } } } close PROG; # print $code; eval $code; exit; } 1;
It's used like so:
use LineDebug; # code...
use LineDebug freq => 10; # code...
It will print the line number of the file on every line ending with a semicolon (THIS IS NOT 100% ACCURATE). Specifically, it will not do this on blank lines. If you give it a frequency argument, it will print every X lines, if that line ends in a semicolon or is blank.


In reply to constant line number reporting by japhy
in thread (Debugging, Tracing, Trace, Instrumenting) Automatic tracing of my Perl code? by princepawn

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