Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

Re: Re: Unbelievably Obvious Debugging Tip

by Anomynous Monk (Scribe)
on Apr 27, 2004 at 16:52 UTC ( #348570=note: print w/ replies, xml ) Need Help??


in reply to Re: Unbelievably Obvious Debugging Tip
in thread Unbelievably Obvious Debugging Tip

When I don't use Data::Dumper, I do something like: print join "|", "", $list, $of, $vars, ""
with the beginning and ending empty string making join put the separator there.


Comment on Re: Re: Unbelievably Obvious Debugging Tip
Download Code
Replies are listed 'Best First'.
Re^3: Unbelievably Obvious Debugging Tip
by radiantmatrix (Parson) on Dec 15, 2004 at 00:05 UTC

    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)}

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://348570]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others having an uproarious good time at the Monastery: (8)
As of 2015-07-08 03:26 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 (94 votes), past polls