+#!/usr/bin/perl
+#
+# watch the end of the current debug file (like tail -f) applying
+# any regexes supplied on the command line.
+#
+# examples:-
+#
+# watchdbg g1tlh # watch everything g1tlh does
+# watchdbg gb7baa gb7djk # watch the conversation between BAA and DJK
+#
+
+require 5.004;
+
+# search local then perl directories
+BEGIN {
+ # root of directory tree for this system
+ $root = "/spider";
+ $root = $ENV{'DXSPIDER_ROOT'} if $ENV{'DXSPIDER_ROOT'};
+
+ unshift @INC, "$root/perl"; # this IS the right way round!
+ unshift @INC, "$root/local";
+}
+
+use IO::File;
+use DXVars;
+use DXUtil;
+use DXLog;
+
+use strict;
+
+my $fp = DXLog::new('debug', 'dat', 'd');
+my @today = Julian::unixtoj(time());
+my $fh = $fp->open(@today) or die $!;
+my $exp = join '|', @ARGV;
+
+# seek to end of file
+$fh->seek(0, 2);
+for (;;) {
+ my $line = <$fh>;
+ if ($line) {
+ if ($exp) {
+ printit($line) if $line =~ m{(?:$exp)}oi;
+ } else {
+ printit($line);
+ }
+ } else {
+ sleep(1);
+
+ # check that the debug hasn't rolled over to next day
+ # open it if it has
+ my @now = Julian::unixtoj(time());
+ if ($today[1] != $now[1]) {
+ $fp->close;
+ $fh = $fp->open(@now) or die $!;
+ }
+ }
+}
+
+sub printit
+{
+ my $line = shift;
+ my @line = split '\^', $line;
+ my $t = shift @line;
+ print atime($t), ' ', join('^', @line);
+}
+exit(0);