122 lines
3.1 KiB
Perl
Executable File
122 lines
3.1 KiB
Perl
Executable File
#!/usr/local/bin/perl -w
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use IO::Socket;
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use Fcntl;
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if($#ARGV < 0)
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{
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print "Usage: tail.pl file\n";
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exit;
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}
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$filename = shift @ARGV;
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# Connect to the server...
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$remote = IO::Socket::INET->new(
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Proto => "tcp",
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PeerAddr => "localhost",
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PeerPort => "13666",
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)
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|| die "Cannot connect to LCDproc port\n";
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# Make sure our messages get there right away
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$remote->autoflush(1);
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sleep 1; # Give server plenty of time to notice us...
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print $remote "hello\n";
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my $lcdconnect = <$remote>;
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print $lcdconnect;
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# Turn off blocking mode...
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fcntl($remote, F_SETFL, O_NONBLOCK);
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# Set up some screen widgets...
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print $remote "client_set name {Tail ($filename)}\n";
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print $remote "screen_add tail\n";
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print $remote "screen_set tail name {Tail $filename}\n";
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print $remote "widget_add tail title title\n";
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print $remote "widget_set tail title {Tail: $filename}\n";
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print $remote "widget_add tail 1 string\n";
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print $remote "widget_add tail 2 string\n";
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print $remote "widget_add tail 3 string\n";
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# These define the visible part of the file...
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$top = 3; # How far from the end of the file should we start?
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$lines = 3; # How many lines to display?
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$left = 1; # Left/right scrolling position,
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$width = 20; # and number of characters per line to show
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$slow = 1; # Should we pause after the current frame?
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# Forever, we should do stuff...
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while(1)
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{
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# Handle input... (spew it to the console)
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# Also, certain keys scroll the display
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while(defined($input = <$remote>)) {
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print $input;
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$slow = -10;
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# Make sure we handle each line...
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@lines = split(/\n/, $input);
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foreach $line (@lines)
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{
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if($line =~ /^key (\S)/) # Keypresses are useful.
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{
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$key = $1;
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if($key eq "G") { $top++; }
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if($key eq "H")
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{
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if($top > $lines) {$top--; }
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}
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if($key eq "F") { $left++; }
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if($key eq "E")
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{
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if($left > 1) {$left--; }
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}
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}
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}
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}
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# Now, show what the file contains, if anything...
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if( -f $filename )
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{
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# Grab some text.
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$right = $left + $width - 1;
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$text = `tail -$top $filename | head -$lines | cut -c$left-$right`;
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@lines = split(/\n/, $text);
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# Now, display that text...
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for($i=0; $i<$lines; $i++)
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{
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$j = $i + 1;
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$k = $i + 2;
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if($#lines < $i) { $line = " "; } # Avoid blank lines
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else { $line = $lines[$i]; }
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if(!($line =~ /\S/)) { $line = " ";}
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print $remote "widget_set tail $j 1 $k {$line }\n";
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}
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}
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else # If the file is unreadable, show an error
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{
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print $remote "widget_set tail one 1 2 {$filename}\n";
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print $remote "widget_set tail two 1 3 {doesn't exist.}\n";
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print $remote "widget_set tail three 1 4 { }\n";
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}
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# And wait a little while before we show stuff again.
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if($slow > 0) {sleep 1; $slow++;}
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elsif($slow > 4) {sleep 2; $slow++;}
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elsif($slow > 64) {sleep 4; }
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else {$slow++;}
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# The "slow" thing just lets us have a better response time
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# while the user is pressing keys... But while the user
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# is inactive, it gradually decreases update frequency.
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}
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close ($remote) || die "close: $!";
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exit;
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