added some comments

[spider.git] / perl / watchdbg

diff --git a/perl/watchdbg b/perl/watchdbg
index fef5cdf7e8e1f54a081f3da530b2fcd08e32f71b..dec397091dba07d826dbc7e7eb887c8a0a98d0ca 100755 (executable)
--- a/perl/watchdbg
+++ b/perl/watchdbg
@@ -6,6 +6,7 @@
 # examples:-
 # 
 #   watchdbg g1tlh       # watch everything g1tlh does
+#   watchdbg 2 PCPROT       # watch all PCPROT messages + up to 2 lines before
 #   watchdbg gb7baa gb7djk   # watch the conversation between BAA and DJK 
 #
 
@@ -31,7 +32,10 @@ use strict;
 my $fp = DXLog::new('debug', 'dat', 'd');
 my @today = Julian::unixtoj(time()); 
 my $fh = $fp->open(@today) or die $!; 
+my $nolines = 1;
+$nolines = shift if $ARGV[0] =~ /^\d+$/;
 my $exp = join '|', @ARGV;
+my @prev;
 
 # seek to end of file
 $fh->seek(0, 2);
@@ -39,13 +43,18 @@ for (;;) {
        my $line = <$fh>;
        if ($line) {
                if ($exp) {
-                       printit($line) if $line =~ m{(?:$exp)}oi;
+                       push @prev, $line;
+                       shift @prev while @prev > $nolines; 
+                       if ($line =~ m{(?:$exp)}oi) {
+                               printit(@prev); 
+                               @prev = ();
+                       }
                } else {
-                   printit($line);
-               }
+                       printit($line);
+               }
        } else {
                sleep(1);
-
+               
                # check that the debug hasn't rolled over to next day
                # open it if it has
                my @now = Julian::unixtoj(time()); 
@@ -64,12 +73,16 @@ for (;;) {
 
 sub printit
 {
-       my $line = shift;
-       my @line =  split '\^', $line;
-       my $t = shift @line;
-        my ($sec,$min,$hour) = gmtime((defined $t) ? $t : time);
-        my $buf = sprintf "%02d:%02d:%02d", $hour, $min, $sec;
-
-       print $buf, ' ', join('^', @line); 
+       while (@_) {
+               my $line = shift;
+               chomp $line;
+               $line =~ s/([\x00-\x1f\x7f-\xff])/sprintf("\\x%02X", ord($1))/eg; 
+               my @line =  split '\^', $line;
+               my $t = shift @line;
+               my ($sec,$min,$hour) = gmtime((defined $t) ? $t : time);
+               my $buf = sprintf "%02d:%02d:%02d", $hour, $min, $sec;
+               
+               print $buf, ' ', join('^', @line), "\n"; 
+       }
 }
 exit(0);