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Data can now come from STDIN or files on the cmdline

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This emulates the while(<>) syntax in perl, and makes self-plotting data files
work again. These have been broken since that syntax was taken away in
4cfcf0fc35
This commit is contained in:
Dima Kogan 2017-03-19 19:50:34 -07:00
parent a0c9e6e8bc
commit 5740e55a6f
1 changed files with 58 additions and 12 deletions
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70
bin/feedgnuplot
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@ -41,17 +41,10 @@ my $last_replot_time = [gettimeofday];
# whether the previous replot was timer based
my $last_replot_is_from_timer = 1;
my $prev_timed_replot_time = [gettimeofday];
my $this_replot_is_from_timer;
my $stdin = IO::Handle->new();
die "Couldn't open STDIN" unless $stdin->fdopen(fileno(STDIN),"r");
my $selector = IO::Select->new( $stdin );
mainThread();
@ -122,7 +115,6 @@ sub interpretCommandline
'help', 'dump', 'exit', 'version',
'geometry=s') or exit 1;
# handle various cmdline-option errors
if ( $options{help} )
{
@ -479,16 +471,66 @@ sub makeDomainNumeric
}
my $prev_timed_replot_time = [gettimeofday];
my $pipe_in;
my $selector;
my $line_number = 0;
my $is_stdin = !@ARGV; # read stdin only if no data files given on the cmdline
sub openNextFile
{
my $fd;
if($is_stdin)
{
$fd = IO::Handle->new();
$fd->fdopen(fileno(STDIN), "r") or die "Couldn't open STDIN";
}
else
{
my $filename = shift @ARGV;
$fd = IO::File->new($filename, "r") or die "Couldn't open file '$filename'";
}
my $selector = IO::Select->new( $fd );
return ($fd, $selector);
}
sub getNextLine
{
sub getline_internal
{
while(1)
{
my $line = $pipe_in->getline();
if( !$is_stdin && !defined $line && $pipe_in->eof() && @ARGV)
{
# I got to the end of one file, so open the next one (which I'm
# sure exists)
($pipe_in, $selector) = openNextFile();
next;
}
return $line;
}
}
if( !defined $pipe_in )
{
($pipe_in, $selector) = openNextFile();
}
while(1)
{
$this_replot_is_from_timer = undef;
# if we're not streaming, or we're doing triggered-only replotting, simply
# do a blocking read
return $stdin->getline()
if (! $options{stream} || $options{stream} < 0);
if (! $options{stream} || $options{stream} < 0)
{
$line_number++;
return getline_internal();
}
my $now = [gettimeofday];
@ -503,7 +545,8 @@ sub getNextLine
if ($selector->can_read($time_remaining))
{
return $stdin->getline();
$line_number++;
return getline_internal();
}
}
}
@ -773,7 +816,7 @@ sub mainThread
}
else
{
$domain[0] = $.;
$domain[0] = $line_number;
$domain0_numeric = makeDomainNumeric( $domain[0] );
}
@ -1082,6 +1125,9 @@ sub pushPoint
}
mainThread();
=head1 NAME
feedgnuplot - General purpose pipe-oriented plotting tool