Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

Because I often deal with data containing every char on the keyboard, I use:

print STDERR join("\x1E", @list),"\x1E\n";

This gives me an output with visible record separators (ASCII 0x1E is actuall "Record Separator") quite cleanly, and I use STDERR to avoid bufferring. Default buffering of STDOUT has bitten my debug routines a few times.

If I'm working a large project, I use my own little module that exports a number of debugging "tools", including this:

sub dbg { return unless $DEBUG; my $dump = 0; ($dump = 1 && shift) if ($_[0] eq ':DUMP:'); $LOGFILE = open_logfile(); foreach my $item (@_) { $str = (($dump && ref $item) ? Dumper($item) : $item)."\x1E\n +"; print $LOGFILE POSIX::strftime("%Y%m%d:%H.%M.%S\x1E",localtime +).$str if defined $LOGFILE; print STDERR $str unless $QUIET; } }

The open_logfile sub returns an opened file handle, or opens a new one if need be, to "DEBUG.LOG". Debug items are written to STDERR unless I set $QUIET, and they are always written to the logfile, prepended by a timestamp.

And, of course, if I unset $DEBUG, then it's basically a no-op.

Run the following with 'you stupid foo' as arguments:

#!/usr/bin/perl use Private::Debug 'dbg'; $Private::Debug::DEBUG = 1; $Private::Debug::QUIET = 0; dbg("Hello there", "You fool"); dbg(':DUMP:', "ARGV:", \@ARGV);

Results in

#DEBUG.LOG
20041214:17.58.22▲Hello there▲
20041214:17.58.22▲You fool▲
20041214:17.58.22▲ARGV:▲
20041214:17.58.22▲$VAR1 = [
          'you',
          'stupid',
          'foo'
        ];
▲

#STDERR
Hello there▲
You fool▲
ARGV:▲
$VAR1 = [
          'you',
          'stupid',
          'foo'
        ];
▲

It works quite well. The '?' you might see actually shows up as an upward triangle in a terminal, so it is very clear.

radiantmatrix
require General::Disclaimer;
s//2fde04abe76c036c9074586c1/; while(m/(.)/g){print substr(' ,JPacehklnorstu',hex($1),1)}


In reply to Re^3: Unbelievably Obvious Debugging Tip by radiantmatrix
in thread Unbelievably Obvious Debugging Tip by dreadpiratepeter

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others rifling through the Monastery: (6)
    As of 2015-07-28 02:06 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (251 votes), past polls