version bump

This looks like a large patch, but it's 99% re-indentation

Changes

@@ -1,10 +1,59 @@
-feedgnuplot (1.30) unstable; urgency=low
+feedgnuplot (1.36)
+
+  * Added --equation to plot symbolic equations
+
+ -- Dima Kogan <dima@secretsauce.net>  Fri, 13 Nov 2015 11:08:26 -0800
+
+feedgnuplot (1.35)
+
+  * replaced a 'say' with 'print'. Should work better with ancient perls
+  * an "exit" command now has effect even with triggered-only replotting
+
+  * More sophisticated handling of termination conditions:
+    - Without --exit, we always end up with an interactive plot when the
+    input data is exhausted or when the user sends a ^C to the pipeline
+    - When streaming, the first ^C does not kill feedgnuplot
+  
+  * Removed threading
+
+ -- Dima Kogan <dima@secretsauce.net>  Sun, 01 Nov 2015 12:50:33 -0800
+
+feedgnuplot (1.34)
+
+  * Fix for "Use of implicit split to @_ is deprecated". Thanks to Corey
+    Putkunz
+
+  * Declaring feedgnuplot as a package to let MetaCPAN index this
+    distribution
+
+ -- Dima Kogan <dima@secretsauce.net>  Wed, 14 May 2014 00:45:24 -0700
+
+feedgnuplot (1.33)
+
+  * fixed incorrect plotting of --timefmt --rangesize plots
+
+ -- Dima Kogan <dima@secretsauce.net>  Thu, 06 Feb 2014 23:17:21 -0800
+
+feedgnuplot (1.32)
+
+  * Added --rangesize and --rangesizeall. Different curves can now plot
+    different-size tuples
+
+ -- Dima Kogan <dima@secretsauce.net>  Wed, 05 Feb 2014 13:57:58 -0800
+
+feedgnuplot (1.31)
+
+  * Test suite requires gawk to get strftime()
+
+ -- Dima Kogan <dima@secretsauce.net>  Sat, 25 Jan 2014 20:49:38 -0800
+
+feedgnuplot (1.30)
 
   * Added --with, --set, --unset, --style, --styleall
 
  -- Dima Kogan <dima@secretsauce.net>  Fri, 24 Jan 2014 15:38:07 -0800
 
-feedgnuplot (1.29) unstable; urgency=low
+feedgnuplot (1.29)
 
   * added CPAN meta-data to require IPC::Run at build time
 

bin/feedgnuplot

@@ -1,19 +1,20 @@
 #!/usr/bin/perl
+
+package feedgnuplot; # for the metacpan indexer
+
 use strict;
 use warnings;
 use Getopt::Long;
 use Time::HiRes qw( usleep gettimeofday tv_interval );
 use IO::Handle;
+use IO::Select;
 use List::Util qw( first );
 use Scalar::Util qw( looks_like_number );
-use Text::ParseWords;
-use threads;
-use threads::shared;
-use Thread::Queue;
+use Text::ParseWords; # for shellwords
 use Pod::Usage;
 use Time::Piece;
 
-my $VERSION = 1.30;
+my $VERSION = 1.36;
 
 my %options;
 interpretCommandline();
@@ -26,16 +27,11 @@ interpretCommandline();
 # with --xlen, the offsets are preserved by using $curve->{datastring_offset} to
 # represent the offset IN THE ORIGINAL STRING of the current start of the
 # datastring
-
-
 my @curves = ();
 
 # list mapping curve names to their indices in the @curves list
 my %curveIndices = ();
 
-# now start the data acquisition and plotting threads
-my $dataQueue;
-
 # Whether any new data has arrived since the last replot
 my $haveNewData;
 
@@ -45,39 +41,16 @@ my $last_replot_time = [gettimeofday];
 # whether the previous replot was timer based
 my $last_replot_is_from_timer = 1;
 
-my $streamingFinished : shared = undef;
 
-if($options{stream})
-{
-  $dataQueue  = Thread::Queue->new();
-  my $addThr  = threads->create(\&mainThread);
+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 );
 
-  # spawn the plot updating thread. If I'm replotting from a data trigger, I don't need this
-  my $plotThr = threads->create(\&plotUpdateThread) if $options{stream} > 0;
 
-  while(<>)
-  {
-    chomp;
 
-    last if /^exit/;
-
-    # place every line of input to the queue, so that the plotting thread can process it. if we are
-    # using an implicit domain (x = line number), then we send it on the data queue also, since
-    # $. is not meaningful in the plotting thread
-    if(!$options{domain})
-    {
-      $_ .= " $.";
-    }
-    $dataQueue->enqueue($_);
-  }
-
-  $streamingFinished = 1;
-
-  $plotThr->join() if defined $plotThr;
-  $addThr->join();
-}
-else
-{ mainThread(); }
+mainThread();
 
 
 
@@ -116,20 +89,25 @@ sub interpretCommandline
   $options{extracmds}  = [];
   $options{set}        = [];
   $options{unset}      = [];
+  $options{equation}   = [];
 
   $options{curvestyleall} = '';
   $options{styleall}      = '';
   $options{with}          = '';
 
+  $options{rangesize} = [];
+
   GetOptions(\%options, 'stream:s', 'domain!', 'dataid!', '3d!', 'colormap!', 'lines!', 'points!',
              'circles', 'legend=s{2}', 'autolegend!', 'xlabel=s', 'ylabel=s', 'y2label=s', 'zlabel=s',
              'title=s', 'xlen=f', 'ymin=f', 'ymax=f', 'xmin=s', 'xmax=s', 'y2min=f', 'y2max=f',
              'zmin=f', 'zmax=f', 'y2=s@',
              'style=s{2}', 'curvestyle=s{2}', 'curvestyleall=s', 'styleall=s', 'with=s', 'extracmds=s@', 'set=s@', 'unset=s@',
              'square!', 'square_xy!', 'hardcopy=s', 'maxcurves=i', 'monotonic!', 'timefmt=s',
+             'equation=s@',
              'histogram=s@', 'binwidth=f', 'histstyle=s',
              'terminal=s',
-             'extraValuesPerPoint=i', 'help', 'dump', 'exit', 'version',
+             'rangesize=s{2}', 'rangesizeall=i', 'extraValuesPerPoint=i',
+             'help', 'dump', 'exit', 'version',
              'geometry=s') or pod2usage( -exitval => 1,
                                          -verbose => 1, # synopsis and args
                                          -output  => \*STDERR );
@@ -176,7 +154,7 @@ sub interpretCommandline
   # arrays in order to preserve the ordering. I parse both of these into hashes
   # because those are useful to have later. After this I can access individual
   # legends with $options{legend_hash}{curveid}
-  for my $listkey (qw(legend curvestyle))
+  for my $listkey (qw(legend curvestyle rangesize))
   {
     $options{"${listkey}_hash"} = {};
 
@@ -193,11 +171,37 @@ sub interpretCommandline
     exit -1;
   }
 
+  if ( defined $options{rangesizeall} && defined $options{extraValuesPerPoint} )
+  {
+    print STDERR "Only one of --rangesizeall and --extraValuesPerPoint may be given\n";
+    exit -1;
+  }
+
+
+  # I now set up the rangesize to always be
+  #  $options{rangesize_hash}{$id} // $options{rangesize_default}
+  if ( $options{rangesizeall} )
+  {
+      $options{rangesize_default} = $options{rangesizeall};
+  }
+  else
+  {
+      $options{rangesize_default} = 1;
+
+      $options{rangesize_default} += $options{extraValuesPerPoint} if ($options{extraValuesPerPoint});
+      $options{rangesize_default}++                                if ($options{colormap});
+      $options{rangesize_default}++                                if ($options{circles} );
+  }
+
+
   # parse stream option. Allowed only numbers >= 0 or 'trigger'. After this code
   # $options{stream} is
   #  -1 for triggered replotting
   #  >0 for timed replotting
   #  undef if not streaming
+  #
+  #  Note that '0' is not allowed, so !$options{stream} will do the expected
+  #  thing
   if(defined $options{stream})
   {
     # if no streaming period is given, default to 1Hz.
@@ -345,10 +349,8 @@ sub interpretCommandline
     $options{timefmt} =~ s/^\s*//;
     $options{timefmt} =~ s/\s*$//;
 
-    my $Nfields = scalar split( ' ', $options{timefmt});
+    my $Nfields = () = split /\s+/, $options{timefmt}, -1;
     $options{timefmt_Ncols} = $Nfields;
-    my $regex_str = join( '\s+', ('\S+') x $Nfields );
-    $options{timefmt_regex} = qr/$regex_str/;
 
     # make sure --xlen is an integer. With a timefmt xlen goes through strptime
     # and strftime, and those are integer-only
@@ -356,7 +358,7 @@ sub interpretCommandline
     {
       if( $options{xlen} - int($options{xlen}) )
       {
-        say STDERR "When streaming --xlen MUST be an integer. Rounding up to the nearest second";
+        print STDERR "When streaming --xlen MUST be an integer. Rounding up to the nearest second\n";
         $options{xlen} = 1 + int($options{xlen});
       }
     }
@@ -377,19 +379,6 @@ sub getGnuplotVersion
   return $gnuplotVersion;
 }
 
-sub plotUpdateThread
-{
-  while(! $streamingFinished)
-  {
-    usleep( $options{stream} * 1e6 );
-
-    # indicate that the timer was the replot source
-    $dataQueue->enqueue('replot timertick');
-  }
-
-  $dataQueue->enqueue(undef);
-}
-
 sub sendRangeCommand
 {
   my ($name, $min, $max) = @_;
@@ -425,21 +414,64 @@ sub makeDomainNumeric
   return $domain0;
 }
 
+
+sub getNextLine
+{
+    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);
+
+
+        my $now = [gettimeofday];
+        my $time_remaining = $options{stream} - tv_interval($prev_timed_replot_time, $now);
+
+        if ( $time_remaining < 0 )
+        {
+            $prev_timed_replot_time = $now;
+            $this_replot_is_from_timer = 1;
+            return 'replot';
+        }
+
+        if ($selector->can_read($time_remaining))
+        {
+            return $stdin->getline();
+        }
+    }
+}
+
 sub mainThread
 {
-    my $valuesPerPoint = 1;
-    if($options{extraValuesPerPoint}) { $valuesPerPoint += $options{extraValuesPerPoint}; }
-    if($options{colormap})            { $valuesPerPoint++; }
-    if($options{circles} )            { $valuesPerPoint++; }
-
     local *PIPE;
     my $dopersist = '';
 
-    if( !$options{stream} && getGnuplotVersion() >= 4.3)
+    if( getGnuplotVersion() >= 4.3 && # --persist not available before this
+
+        # --persist is needed for the "half-alive" state (see documentation for
+        # --exit). This state is only used with these options:
+        !$options{stream} && $options{exit})
     {
       $dopersist = '--persist';
     }
 
+    # We trap SIGINT to kill the data input, but keep the plot up. see
+    # documentation for --exit
+    if ($options{stream} && !$options{exit})
+    {
+        $SIG{INT} = sub
+        {
+            print STDERR "$0 received SIGINT. Send again to quit\n";
+            $SIG{INT} = undef;
+        };
+    }
+
+
+
+
     if(exists $options{dump})
     {
       *PIPE = *STDOUT;
@@ -573,16 +605,6 @@ sub mainThread
 
     setCurveAsHistogram( $_ ) foreach (@{$options{histogram}});
 
-    # regexp for a possibly floating point, possibly scientific notation number
-    my $numRE   = '-?\d*\.?\d+(?:[Ee][-+]?\d+)?';
-    my $domainRE = $options{timefmt_regex} || $numRE;
-
-
-    # a point may be preceded by an id
-    my $pointRE = $options{dataid} ? '(\S+)\s+' : '()';
-    $pointRE .= '(' . join('\s+', ($numRE) x $valuesPerPoint) . ')';
-    $pointRE = qr/$pointRE/;
-
 # set all the axis ranges
     # If a bound isn't given I want to set it to the empty string, so I can communicate it simply to
     # gnuplot
@@ -616,8 +638,7 @@ sub mainThread
     # number of seconds since the UNIX epoch.
     my $domain0_numeric;
 
-    # I should be using the // operator, but I'd like to be compatible with perl 5.8
-    while( $_ = (defined $dataQueue ? $dataQueue->dequeue() : <>))
+    while( defined ($_ = getNextLine()) )
     {
       next if /^#/o;
 
@@ -631,89 +652,104 @@ sub mainThread
 
         if(/^replot/o )
         {
-          # /timertick/ determines if the timer was the source of the replot
-          replot( $domain0_numeric, /timertick/ );
+          replot( $domain0_numeric );
           next;
         }
 
-        # /exit/ is handled in the data-reading thread
+        last if /^exit/o;
       }
 
-      if(! /^replot/o)
+      # parse the incoming data lines. The format is
+      # x id0 dat0 id1 dat1 ....
+      # where idX is the ID of the curve that datX corresponds to
+      #
+      # $options{domain} indicates whether the initial 'x' is given or not (if not, the line
+      # number is used)
+      # $options{dataid} indicates whether idX is given or not (if not, the point order in the
+      # line is used)
+      # 3d plots require $options{domain}, and dictate "x y" for the domain instead of just "x"
+
+      my @fields = split;
+
+      if($options{domain})
       {
-        # parse the incoming data lines. The format is
-        # x id0 dat0 id1 dat1 ....
-        # where idX is the ID of the curve that datX corresponds to
-        #
-        # $options{domain} indicates whether the initial 'x' is given or not (if not, the line
-        # number is used)
-        # $options{dataid} indicates whether idX is given or not (if not, the point order in the
-        # line is used)
-        # 3d plots require $options{domain}, and dictate "x y" for the domain instead of just "x"
-
-        if($options{domain})
+        if( $options{timefmt} )
         {
-          /($domainRE)/go or next;
-          $domain[0] = $1;
-          $domain0_numeric = makeDomainNumeric( $domain[0] );
+            # no point if doing anything unless I have at least the domain and
+            # 1 piece of data
+            next if @fields < $options{timefmt_Ncols}+1;
 
-          if($options{'3d'})
-          {
-            /($numRE)/go or next;
-            $domain[1] = $1;
-          }
-          elsif( $options{monotonic} )
-          {
-            if( defined $latestX && $domain0_numeric < $latestX )
-            {
-              # the x-coordinate of the new point is in the past, so I wipe out
-              # all the data and start anew. Before I wipe the old data, I
-              # replot the old data
-              replot( $domain0_numeric );
-              clearCurves();
-              $latestX = undef;
-            }
-            else
-            { $latestX = $domain0_numeric; }
-          }
+            $domain[0] = join (' ', splice( @fields, 0, $options{timefmt_Ncols}) );
+            $domain0_numeric = makeDomainNumeric( $domain[0] );
+        }
+        elsif(!$options{'3d'})
+        {
+            # no point if doing anything unless I have at least the domain and
+            # 1 piece of data
+            next if @fields < 1+1;
 
+            $domain[0] = $domain0_numeric = shift @fields;
         }
         else
         {
-          # since $. is not meaningful in the plotting thread if we're using the data queue, we pass
-          # $. on the data queue in that case
-          if(defined $dataQueue)
+            # no point if doing anything unless I have at least the domain and
+            # 1 piece of data
+            next if @fields < 2+1;
+
+            @domain = splice(@fields, 0, 2);
+        }
+
+        if( $options{monotonic} )
+        {
+          if( defined $latestX && $domain0_numeric < $latestX )
           {
-            s/ ([\d]+)$//o;
-            $domain[0] = $1;
+            # the x-coordinate of the new point is in the past, so I wipe out
+            # all the data and start anew. Before I wipe the old data, I
+            # replot the old data
+            replot( $domain0_numeric );
+            clearCurves();
+            $latestX = undef;
+          }
+          else
+          { $latestX = $domain0_numeric; }
+        }
+      }
+      else
+      {
+        $domain[0] = $.;
+        $domain0_numeric = makeDomainNumeric( $domain[0] );
+      }
+
+      my $id = -1;
+
+      while(@fields)
+      {
+          if($options{dataid})
+          {
+              $id = shift @fields;
           }
           else
           {
-            $domain[0] = $.;
+              $id++;
           }
-          $domain0_numeric = makeDomainNumeric( $domain[0] );
-        }
 
-        my $id = -1;
-        while (/$pointRE/go)
-        {
-          if($1 ne '') {$id = $1;}
-          else         {$id++;   }
+          # I'd like to use //, but I guess some people are still on perl 5.8
+          my $rangesize = exists $options{rangesize_hash}{$id} ?
+            $options{rangesize_hash}{$id} :
+            $options{rangesize_default};
+
+          last if @fields < $rangesize;
 
           pushPoint(getCurve($id),
-                    "@domain $2\n", $domain0_numeric);
-        }
+                    join(' ',
+                         @domain,
+                         splice( @fields, 0, $rangesize ) ) . "\n",
+                    $domain0_numeric);
       }
     }
 
-    # if we were streaming, we're now done!
-    if( $options{stream} )
-    {
-      return;
-    }
-
     # finished reading in all. Plot what we have
-    plotStoredData();
+    plotStoredData() unless $options{stream};
 
     if ( defined $options{hardcopy})
     {
@@ -722,7 +758,7 @@ sub mainThread
       # sleep until the plot file exists, and it is closed. Sometimes the output
       # is still being written at this point. If the output filename starts with
       # '|', gnuplot pipes the output to that process, instead of writing to a
-      # file. In that case I don't make sure the file exists, since there IS not
+      # file. In that case I don't make sure the file exists, since there IS no
       # file
       if( $options{hardcopy} !~ /^\|/ )
       {
@@ -734,6 +770,13 @@ sub mainThread
       return;
     }
 
+    # data exhausted. If we're killed now, then we should peacefully die.
+    if($options{stream} && !$options{exit})
+    {
+        print STDERR "Input data exhausted\n";
+        $SIG{INT} = undef;
+    }
+
     # we persist gnuplot, so we shouldn't need this sleep. However, once
     # gnuplot exits, but the persistent window sticks around, you can no
     # longer interactively zoom the plot. So we still sleep
@@ -777,7 +820,9 @@ sub plotStoredData
   my @nonemptyCurves = grep { $_->{datastring} } @curves;
   my @extraopts = map {$_->{options}} @nonemptyCurves;
 
-  my $body = join(', ' , map({ "'-' $_" } @extraopts) );
+  my $body = join('', map { "$_," } @{$options{equation}});
+  $body .= join(', ' , map({ "'-' $_" } @extraopts) );
+
   if($options{'3d'}) { print PIPE "splot $body\n"; }
   else               { print PIPE  "plot $body\n"; }
 
@@ -824,7 +869,19 @@ sub updateCurveOptions
   my $usingoptions = '';
   if( $options{timefmt} )
   {
-    $usingoptions = "using 1:" . ($options{timefmt_Ncols}+1);
+      # with --timefmt I need an explicit 'using' specification. I specify the
+      # columns as 1:2:3..... I need the right number of columns (this is given
+      # as 1 + rangesize). I also need to start the range at the first column
+      # past the timefmt
+
+      # I'd like to use //, but I guess some people are still on perl 5.8
+      my $rangesize = exists $options{rangesize_hash}{$id} ?
+        $options{rangesize_hash}{$id} :
+        $options{rangesize_default};
+
+      my @rest = map {$_ + $options{timefmt_Ncols}} (1..$rangesize);
+
+      $usingoptions = "using 1:" . join(':', @rest);
   }
 
   $curve->{options} = "$histoptions $usingoptions $titleoption $curve->{extraoptions} $curvestyleall";
@@ -919,7 +976,7 @@ sub replot
   # }
 
 
-  my ($domain0_numeric, $replot_is_from_timer) = @_;
+  my ($domain0_numeric) = @_;
 
   my $now = [gettimeofday];
 
@@ -929,7 +986,7 @@ sub replot
       # if the last replot was timer-based, but this one isn't, force a replot.
       # This makes sure that a replot happens for a domain rollover shortly
       # after a timer replot
-      !$replot_is_from_timer && $last_replot_is_from_timer ||
+      !$this_replot_is_from_timer && $last_replot_is_from_timer ||
 
       # if enough time has elapsed since the last replot, it's ok to replot
       tv_interval ( $last_replot_time, $now ) > 0.8*$options{stream} )
@@ -955,7 +1012,7 @@ sub replot
 
     # update replot state
     $last_replot_time          = $now;
-    $last_replot_is_from_timer = $replot_is_from_timer;
+    $last_replot_is_from_timer = $this_replot_is_from_timer;
   }
 }
 
@@ -1112,17 +1169,24 @@ conjunction with C<--dataid>.
 =head3 Multi-value style support
 
 Depending on how gnuplot is plotting the data, more than one value may be needed
-to represent a single point. For example, the script has support to plot all the
-data with C<--circles>. This requires a radius to be specified for each point in
-addition to the position of the point. Thus, when plotting with C<--circles>, 2
-numbers are read for each data point instead of 1. A similar situation exists
-with C<--colormap> where each point contains the position I<and> the color.
-There are other gnuplot styles that require more data (such as error bars), but
-none of these are directly supported by the script. They can still be used,
-though, by specifying the specific style with C<--style>, and specifying how
-many extra values are needed for each point with C<--extraValuesPerPoint extra>.
-C<--extraValuesPerPoint> is ONLY needed for the styles not explicitly supported;
-supported styles set that variable automatically.
+to represent the range of a single point. Basic 2D plots have 2 numbers
+representing each point: 1 domain and 1 range. But if plotting with
+C<--circles>, for instance, then there's an extra range value: the radius. A
+similar situation exists with C<--colormap> where each point contains the
+position I<and> the color. There are other gnuplot styles that require more data
+(such as error bars), but none of these are directly supported by the script.
+They can still be used, however, by specifying the specific style with
+C<--style>, and specifying how many values are needed for each point with
+C<--rangesizeall> or C<--rangesize> or C<--extraValuesPerPoint>. Those options
+that specify the range size are required I<only> for styles not explicitly
+supported by feedgnuplot; supported styles do the right thing automatically.
+
+More examples: if making a 2d plot of y error bars where gnuplot expects a
+(x,y,ydelta) tuple for each point, you want C<--rangesizeall 2> because you have
+one domain value (x) and 2 range values (y,ydelta). Gnuplot can also plot
+lopsided y errorbars by giving a tuple (x,y,ylow,yhigh). This is similar as
+before, but you want C<--rangesizeall 3> instead.
+
 
 =head3 3D data
 
@@ -1157,7 +1221,7 @@ C<--xmin> and C<--xmax> I<must> use the format passed in to C<--timefmt>
 
 Using this option changes both the way the input is parsed I<and> the way the
 x-axis tics are labelled. Gnuplot tries to be intelligent in this labelling, but
-it doesn't always to what the user wants. The labelling can be controlled with
+it doesn't always do what the user wants. The labelling can be controlled with
 the gnuplot C<set format> command, which takes the same type of format string as
 C<--timefmt>. Example:
 
@@ -1365,8 +1429,7 @@ Interpret the X data as a time/date, parsed with the given format
 C<--colormap>
 
 Show a colormapped xy plot. Requires extra data for the color. zmin/zmax can be
-used to set the extents of the colors. Automatically increments
-C<--extraValuesPerPoint>
+used to set the extents of the colors. Automatically sets the C<--rangesize>.
 
 =item
 
@@ -1394,8 +1457,7 @@ Do [not] draw points
 C<--circles>
 
 Plot with circles. This requires a radius be specified for each point.
-Automatically increments C<--extraValuesPerPoint>). C<Not> supported for 3d
-plots.
+Automatically sets the C<--rangesize>. C<Not> supported for 3d plots.
 
 =item
 
@@ -1552,6 +1614,34 @@ times.
 
 =item
 
+C<--equation xxx>
+
+Gnuplot can plot both data and symbolic equations. C<feedgnuplot> generally
+plots data, but with this option can plot symbolic equations /also/. This is
+generally intended to augment data plots, since for equation-only plots you
+don't need C<feedgnuplot>. C<--equation> can be passed multiple times for
+multiple equations. The given strings are passed to gnuplot directly without any
+thing added or removed, so styling and such should be applied in the string. A
+basic example:
+
+ seq 100 | awk '{print $1/10, $1/100}' |
+   feedgnuplot --with 'lines lw 3' --domain --ymax 1
+               --equation 'sin(x)/x' --equation 'cos(x)/x with lines lw 4'
+
+Here I plot the incoming data (points along a line) with the given style (a line
+with thickness 3), /and/ I plot two damped sinusoids on the same plot. The
+sinusoids are not affected by C<feedgnuplot> styling, so their styles are set
+separately, as in this example. More complicated example:
+
+ seq 360 | perl -nE '$th=$_/360 * 3.14*2; $c=cos($th); $s=sin($th); say "$c $s"' |
+   feedgnuplot --domain --square
+               --set parametric --set "trange [0:2*3.14]" --equation "sin(t),cos(t)"
+
+Here the data I generate is points along the unit circle. I plot these as
+points, and I /also/ plot a true circle as a parametric equation.
+
+=item
+
 C<--square>
 
 Plot data with aspect ratio 1. For 3D plots, this controls the aspect ratio for
@@ -1599,13 +1689,32 @@ replotted before being purged
 
 =item
 
+C<--rangesize curveID xxx>
+
+The options C<--rangesizeall>, C<--rangesize> and C<--extraValuesPerPoint> set
+the number of values are needed to represent each point being plotted (see
+L</"Multi-value style support"> above). These options are I<only> needed if
+unknown styles are used, with C<--styleall> or C<--with> for instance.
+
+C<--rangesize> is used to set how many values are needed to represent the range
+of a point for a particular curve. This overrides any defaults that may exist
+for this curve only.
+
+=item
+
+C<--rangesizeall xxx>
+
+Like C<--rangesize>, but applies to I<all> the curves.
+
 C<--extraValuesPerPoint xxx>
 
-How many extra values are given for each data point. Normally this is 0, and
-does not need to be specified, but sometimes we want extra data, like for colors
-or point sizes or error bars, etc. feedgnuplot options that require this
-(colormap, circles) automatically set it. This option is ONLY needed if unknown
-styles are used, with C<--styleall> or C<--with> for instance
+Like C<--rangesizeall>, but instead of overriding the default, adds to it. For
+example, if plotting non-lopsided y errorbars gnuplot wants (x,y,ydelta) tuples.
+These can be specified both with C<--rangesizeall 2> (because there are 2 range
+values) or C<--extraValuesPerPoint 1> (because there's 1 more value than usual).
+
+This option is I<only> needed if unknown styles are used, with C<--styleall> or
+C<--with> for instance.
 
 =item
 
@@ -1618,10 +1727,80 @@ is possible to send the output produced this way to gnuplot directly.
 
 C<--exit>
 
-Terminate the feedgnuplot process after passing data to gnuplot. The window will
-persist but will not be interactive. Without this option feedgnuplot keeps
-running and must be killed by the user. Note that this option works only with
-later versions of gnuplot and only with some gnuplot terminals.
+This controls the details of what happens when the input data is exhausted, or
+when some part of the C<feedgnuplot> pipeline is killed. This option does
+different things depending on whether C<--stream> is active, so read this
+closely.
+
+With interactive gnuplot terminals (qt, x11, wxt), the plot windows live in a
+separate process from the main C<gnuplot> process. It is thus possible for the
+main C<gnuplot> process to exit, while leaving the plot windows up (a caveat is
+that such decapitated windows aren't interactive). To be clear, there are 3
+possible states:
+
+=over
+
+=item Alive: C<feedgnuplot>, C<gnuplot> alive, plot window process alive, no
+shell prompt (shell busy with C<feedgnuplot>)
+
+=item Half-alive: C<feedgnuplot>, C<gnuplot> dead, plot window process alive
+(but non-interactive), shell prompt available
+
+=item Dead: C<feedgnuplot>, C<gnuplot> dead, plot window process dead, shell
+prompt available
+
+=back
+
+The C<--exit> option controls the details of this behavior. The possibilities
+are:
+
+=over
+
+=item No C<--stream>, input pipe is exhausted (all data read in)
+
+=over
+
+=item default; no C<--exit>
+
+Alive. Need to Ctrl-C to get back into the shell
+
+=item C<--exit>
+
+Half-alive. Non-interactive prompt up, and the shell accepts new commands.
+Without C<--stream> the goal is to show a plot, so a Dead state is not useful
+here.
+
+=back
+
+=item C<--stream>, input pipe is exhausted (all data read in) or the
+C<feedgnuplot> process terminated
+
+=over
+
+=item default; no C<--exit>
+
+Alive. Need to Ctrl-C to get back into the shell
+
+=item C<--exit>
+
+Dead. No plot is shown, and the shell accepts new commands. With C<--stream> the
+goal is to show a plot as the data comes in, which we have been doing. Now that
+we're done, we can clean up everything.
+
+=back
+
+=back
+
+Note that one usually invokes C<feedgnuplot> as a part of a shell pipeline:
+
+ $ write_data | feedgnuplot
+
+If the user terminates this pipeline with ^C, then I<all> the processes in the
+pipeline receive SIGINT. This normally kills C<feedgnuplot> and all its
+C<gnuplot> children, and we let this happen unless C<--stream> and no C<--exit>.
+If C<--stream> and no C<--exit>, then we ignore the first ^C. The data feeder
+dies, and we behave as if the input data was exhausted. A second ^C kills us
+also.
 
 =item
 
@@ -1675,10 +1854,12 @@ in a Thinkpad.
  $ while true; do cat /proc/acpi/ibm/thermal | awk '{$1=""; print}' ; sleep 1; done |
    feedgnuplot --stream --xlen 100 --lines --autolegend --ymax 100 --ymin 20 --ylabel 'Temperature (deg C)'
 
-=head2 Plotting a histogram of file sizes in a directory
+=head2 Plotting a histogram of file sizes in a directory, granular to 10MB
 
  $ ls -l | awk '{print $5/1e6}' |
-   feedgnuplot --histogram 0 --with boxes --ymin 0 --xlabel 'File size (MB)' --ylabel Frequency
+   feedgnuplot --histogram 0 --with boxes
+     --binwidth 10 --set 'style fill solid'
+     --ymin 0 --xlabel 'File size (MB)' --ylabel Frequency
 
 =head1 ACKNOWLEDGEMENT
 

completions/bash/feedgnuplot

@@ -15,6 +15,8 @@ complete -W               \
     --dump                \
     --exit                \
     --extraValuesPerPoint \
+    --rangesizeall        \
+    --rangesize           \
     --extracmds           \
     --set                 \
     --unset               \

completions/zsh/_feedgnuplot

@@ -37,7 +37,9 @@ _arguments -S
     '--hardcopy[Plot to a file]:filename'                                         \
     '--maxcurves[The maximum allowed number of curves]:number of curves'          \
     '(--3d)--monotonic[Resets plot if an X in the past is seen]'                  \
-    '--extraValuesPerPoint[How many extra values are given for each data point]:N'\
+    '(--rangesizeall)--extraValuesPerPoint[How many extra values are given for each data range]:N'\
+    '(--extraValuesPerPoint)--rangesizeall[How many values are given for each data range]:N'\
+    '*--rangesize[How many values comprise a data range in this curve]:curve id: :N:' \
     '--dump[Instead of printing to gnuplot, print to STDOUT]'                     \
     '--geometry[The X11 geometry string]:geometry string:'                        \
     '*--curvestyle[Additional styles for a curve]:curve id: :style:'              \

debian/changelog

@@ -1,58 +0,0 @@
-feedgnuplot (1.30-1) unstable; urgency=low
-
-  * made the VCS links canonical
-  * added --set, --unset, --with, --style, --styleall
-
- -- Dima Kogan <dima@secretsauce.net>  Fri, 24 Jan 2014 15:50:03 -0800
-
-feedgnuplot (1.28-1) unstable; urgency=low
-
-  * Upstream update:
-    - Removed example debianization
-    - Removed unreliable unit tests from automated testing (Closes: #731080)
-  * gnuplot dependency now favors graphical gnuplot packages
-  * Removed Anton Gladky from the Uploaders
-
- -- Dima Kogan <dima@secretsauce.net>  Wed, 04 Dec 2013 02:05:08 -0800
-
-feedgnuplot (1.26-1) unstable; urgency=low
-
-  [ Dima Kogan ]
-  * Minor POD update
-  * Added test suite
-  * Added initial support for --timefmt. Currently time/date data is
-    supported only at the x-axis domain
-  * Added --exit option for force feedgnuplot to return even if gnuplot
-    may not yet be done rendering (patch by Eric Schulte)
-  * Reformatted the documentation
-  * y2-axis curves no longer have a thicker line by default
-  * --hardcopy now handles piped output (gnuplot 'set output |process'
-    syntax)
-
-  [ Anton Gladky ]
-  * Add libipc-run-perl to Build-Depends to execute tests
-
- -- Dima Kogan <dima@secretsauce.net>  Sun, 20 Oct 2013 01:19:51 -0700
-
-feedgnuplot (1.24-2) unstable; urgency=low
-
-  * Now building the html documentation from the correct POD source
-
- -- Dima Kogan <dima@secretsauce.net>  Sun, 28 Apr 2013 17:42:52 -0700
-
-feedgnuplot (1.24-1) unstable; urgency=low
-
-  * Fixed regression in --monotonic. This works again now
-  * moved POD back into the main source file. This fixes the broken usage
-    messages
-  * added --version
-  * fixed watchfile to work with newer github pages
-  * priority now optional
-
- -- Dima Kogan <dima@secretsauce.net>  Fri, 08 Feb 2013 02:01:32 -0800
-
-feedgnuplot (1.23-2) unstable; urgency=low
-
-  * Initial Debian release (Closes: #686413)
-
- -- Dima Kogan <dima@secretsauce.net>  Tue, 30 Oct 2012 11:14:01 -0700

debian/compat

@@ -1 +0,0 @@
-9

debian/control

@@ -1,19 +0,0 @@
-Source: feedgnuplot
-Section: science
-Priority: optional
-Build-Depends: debhelper (>= 9), libstring-shellquote-perl, perl, gawk, gnuplot, libipc-run-perl
-Maintainer: Debian Science Maintainers <debian-science-maintainers@lists.alioth.debian.org>
-Uploaders: Dima Kogan <dima@secretsauce.net>
-Standards-Version: 3.9.4
-Homepage: https://github.com/dkogan/feedgnuplot
-Vcs-Git: git://anonscm.debian.org/debian-science/packages/feedgnuplot.git
-Vcs-Browser: http://anonscm.debian.org/gitweb/?p=debian-science/packages/feedgnuplot.git
-
-Package: feedgnuplot
-Architecture: all
-Depends: ${misc:Depends}, ${perl:Depends}, gnuplot-qt | gnuplot-x11 | gnuplot
-Description: Pipe-oriented frontend to Gnuplot
- Flexible, command-line-oriented frontend to Gnuplot. Creates plots from data
- coming in on STDIN or given in a filename passed on the commandline. Various
- data representations are supported, as is hardcopy output and streaming display
- of live data.

debian/copyright

@@ -1,24 +0,0 @@
-Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
-Source: https://github.com/dkogan/feedgnuplot
-Upstream-Contact: Dima Kogan, <dima@secretsauce.net>
-Upstream-Name: feedgnuplot
-
-Files: *
-Copyright: 2011, Dima Kogan <dima@secretsauce.net>
-License: Artistic or GPL-1+
-
-License: Artistic
- This program is free software; you can redistribute it and/or modify
- it under the terms of the Artistic License, which comes with Perl.
- .
- On Debian GNU/Linux systems, the complete text of the Artistic License
- can be found in `/usr/share/common-licenses/Artistic'.
-
-License: GPL-1+
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
- .
- On Debian GNU/Linux systems, the complete text of version 1 of the
- General Public License can be found in `/usr/share/common-licenses/GPL-1'.

debian/feedgnuplot.doc-base

@@ -1,9 +0,0 @@
-Document: feedgnuplot
-Title: Feedgnuplot Manual
-Author: Dima Kogan
-Abstract: Formatted manpage for feedgnuplot
-Section: Science/Data Analysis
-
-Format: HTML
-Index: /usr/share/doc/feedgnuplot/feedgnuplot.html
-Files: /usr/share/doc/feedgnuplot/feedgnuplot.html

debian/feedgnuplot.docs

@@ -1 +0,0 @@
-feedgnuplot.html

debian/feedgnuplot.install

@@ -1,2 +0,0 @@
-completions/bash/feedgnuplot /etc/bash_completion.d/
-completions/zsh/_feedgnuplot /usr/share/zsh/vendor-completions

debian/gbp.conf

@@ -1,4 +0,0 @@
-[DEFAULT]
-debian-branch = debian
-upstream-tag = v%(version)s
-pristine-tar = True

debian/rules

@@ -1,12 +0,0 @@
-#!/usr/bin/make -f
-
-%:
-	dh $@
-
-override_dh_auto_build:
-	dh_auto_build
-	pod2html --title=feedgnuplot bin/feedgnuplot > feedgnuplot.html
-
-override_dh_auto_clean:
-	rm -rf feedgnuplot.html pod2htm*
-	dh_auto_clean

debian/source/format

@@ -1 +0,0 @@
-3.0 (quilt)

debian/watch

@@ -1,4 +0,0 @@
-version=3
-opts=uversionmangle=s/(\d)[_\.\-\+]?((RC|rc|pre|dev|beta|alpha|b|a)\d*)$/$1~$2/,dversionmangle=s/\+(debian|dfsg|ds|deb)\d*$// \
-https://github.com/dkogan/feedgnuplot/tags .*/v?(\d.*)\.(?:tgz|tbz2|txz|tar\.(?:gz|bz2|xz))
-# Bart Martens <bartm@debian.org>  Sat, 22 Dec 2012 12:54:18 +0000

t/plots.t

@@ -17,14 +17,20 @@ BEGIN {
     exit(0);
   }
 
-  open(my $pipe, 'gnuplot --version |');
-  if( !$pipe )
+  my $gawkversion = `gawk -V`;
+  if( !$gawkversion || $@ )
+  {
+    print("1..0 # Skip: gawk is required for strftime() in the test suite. Skipping tests.\n");
+    exit(0);
+  }
+
+  my $gnuplotVersion = `gnuplot --version`;
+  if( !$gnuplotVersion || $@)
   {
     print("1..0 # Skip: gnuplot not installed. Tests require ver. 4.6.4; feedgnuplot works with any.\n");
     exit(0);
   }
 
-  my $gnuplotVersion = <$pipe>;
   chomp $gnuplotVersion;
   if ($gnuplotVersion ne "gnuplot 4.6 patchlevel 4")
   {
@@ -33,7 +39,7 @@ BEGIN {
   }
 }
 
-use Test::More tests => 52;
+use Test::More tests => 58;
 use File::Temp 'tempfile';
 use IPC::Run 'run';
 use String::ShellQuote;
@@ -320,7 +326,7 @@ tryplot( testname => 'basic line plot with bounds, square aspect ratio',
 EOF
 
 tryplot( testname => 'lines on both axes with labels, legends, titles',
-         cmd      => q{seq 5 | awk '{print 2*$1, $1*$1}'},
+         cmd      => q{seq 5 | gawk '{print 2*$1, $1*$1}'},
          options  => [qw(--lines --points),
                       '--legend', '0', 'data 0',
                       '--title', "Test plot",
@@ -369,7 +375,7 @@ tryplot( testname => 'lines on both axes with labels, legends, titles',
 EOF
 
 tryplot( testname => 'lines on both axes with labels, legends, titles; different styles',
-         cmd      => q{seq 5 | awk '{print 2*$1, $1*$1}'},
+         cmd      => q{seq 5 | gawk '{print 2*$1, $1*$1}'},
          options  => ['--legend', '0', 'data 0',
                       '--title', "Test plot",
                       qw(--y2 1 --y2label y2 --xlabel x --ylabel y --y2max 30),
@@ -419,7 +425,7 @@ tryplot( testname => 'lines on both axes with labels, legends, titles; different
 EOF
 
 tryplot( testname => 'domain plot',
-         cmd      => q{seq 5 | awk '{print 2*$1, $1*$1}'},
+         cmd      => q{seq 5 | gawk '{print 2*$1, $1*$1}'},
          options  => [qw(--lines --points), '--domain'],
          refplot  => <<'EOF' );
 
@@ -465,7 +471,7 @@ tryplot( testname => 'domain plot',
 EOF
 
 tryplot( testname => 'dataid plot',
-         cmd      => q{seq 5 | awk '{print 2*$1, $1*$1}'},
+         cmd      => q{seq 5 | gawk '{print 2*$1, $1*$1}'},
          options  => [qw(--lines --points),
                       qw(--dataid --autolegend)],
          refplot  => <<'EOF' );
@@ -512,7 +518,7 @@ tryplot( testname => 'dataid plot',
 EOF
 
 tryplot( testname => '3d spiral with bounds, labels',
-         cmd      => q{seq 50 | awk '{print 2*cos($1/5), sin($1/5), $1}'},
+         cmd      => q{seq 50 | gawk '{print 2*cos($1/5), sin($1/5), $1}'},
          options  => [qw(--lines --points),
                       qw(--3d --domain --zmin -5 --zmax 45 --zlabel z),
                      '--extracmds', 'set view 60,30'],
@@ -560,7 +566,7 @@ tryplot( testname => '3d spiral with bounds, labels',
 EOF
 
 tryplot( testname => '3d spiral with bounds, labels, square xy aspect ratio',
-         cmd      => q{seq 50 | awk '{print 2*cos($1/5), sin($1/5), $1}'},
+         cmd      => q{seq 50 | gawk '{print 2*cos($1/5), sin($1/5), $1}'},
          options  => [qw(--lines --points),
                       qw(--3d --domain --zmin -5 --zmax 45 --zlabel z),
                      '--extracmds', 'set view 60,30', '--square_xy'],
@@ -608,7 +614,7 @@ tryplot( testname => '3d spiral with bounds, labels, square xy aspect ratio',
 EOF
 
 tryplot( testname => 'Monotonicity check',
-         cmd      => q{seq 10 | awk '{print (NR-1)%5,NR}'},
+         cmd      => q{seq 10 | gawk '{print (NR-1)%5,NR}'},
          options  => [qw(--lines --points --domain --monotonic)],
          refplot  => <<'EOF' );
 
@@ -655,7 +661,7 @@ EOF
 
 
 tryplot( testname => 'basic --timefmt plot',
-         cmd      => q{seq 5 | awk '{print strftime("%d %b %Y %T",1382249107+$1,1),$1}'},
+         cmd      => q{seq 5 | gawk '{print strftime("%d %b %Y %T",1382249107+$1,1),$1}'},
          options  => ['--domain', '--timefmt', '%d %b %Y %H:%M:%S'],
          refplot  => <<'EOF' );
 
@@ -701,7 +707,7 @@ tryplot( testname => 'basic --timefmt plot',
 EOF
 
 tryplot( testname => '--timefmt plot with bounds',
-         cmd      => q{seq 5 | awk '{print strftime("%d %b %Y %T",1382249107+$1,1),$1}'},
+         cmd      => q{seq 5 | gawk '{print strftime("%d %b %Y %T",1382249107+$1,1),$1}'},
          options  => ['--domain', '--timefmt', '%d %b %Y %H:%M:%S',
                       '--xmin', '20 Oct 2013 06:05:00',
                       '--xmax', '20 Oct 2013 06:05:20'],
@@ -749,7 +755,7 @@ tryplot( testname => '--timefmt plot with bounds',
 EOF
 
 tryplot( testname => '--timefmt plot with --monotonic',
-         cmd      => q{seq 10 | awk '{x=(NR-1)%5; print strftime("%d %b %Y %T",1382249107+x,1),$1}'},
+         cmd      => q{seq 10 | gawk '{x=(NR-1)%5; print strftime("%d %b %Y %T",1382249107+x,1),$1}'},
          options  => ['--domain', '--timefmt', '%d %b %Y %H:%M:%S',
                       '--monotonic'],
          refplot  => <<'EOF' );
@@ -795,10 +801,57 @@ tryplot( testname => '--timefmt plot with --monotonic',
 
 EOF
 
+tryplot( testname => '--timefmt with custom rangesize',
+         cmd      => q{seq 5 | gawk '{print strftime("%d %b %Y %T",1382249107+$1,1),$1,$1/10}'},
+         options  => ['--domain', '--timefmt', '%d %b %Y %H:%M:%S',
+                      qw(--with errorbars --rangesizeall 2)],
+         refplot  => <<'EOF' );
+
+
+  5.5 ++---------+-----------+----------+----------+----------+-----------+----------+---------**
+      +          +           +          +          +          +           +          +          *
+      |                                                                                         *
+    5 ++                                                                                       +A
+      |                                                                                         *
+      |                                                                                         *
+      |                                                                                         *
+  4.5 ++                                                                                       **
+      |                                                                  ***                    |
+      |                                                                   *                     |
+    4 ++                                                                  A                    ++
+      |                                                                   *                     |
+      |                                                                   *                     |
+      |                                                                  ***                    |
+  3.5 ++                                                                                       ++
+      |                                           ***                                           |
+      |                                            *                                            |
+    3 ++                                           A                                           ++
+      |                                            *                                            |
+      |                                            *                                            |
+      |                                           ***                                           |
+  2.5 ++                                                                                       ++
+      |                                                                                         |
+      |                     ***                                                                 |
+    2 ++                     A                                                                 ++
+      |                      *                                                                  |
+      |                     ***                                                                 |
+      |                                                                                         |
+  1.5 ++                                                                                       ++
+      |                                                                                         |
+      |                                                                                         |
+    1 A*                                                                                       ++
+      **                                                                                        |
+      |                                                                                         |
+      +          +           +          +          +          +           +          +          +
+  0.5 ++---------+-----------+----------+----------+----------+-----------+----------+---------++
+    05:08      05:08       05:09      05:09      05:10      05:10       05:11      05:11      05:12
+
+EOF
+
 tryplot( testname => 'Error bars (using extraValuesPerPoint)',
-         cmd      => q{seq 5 | awk '{print $1,$1,$1/10}'},
+         cmd      => q{seq 5 | gawk '{print $1,$1,$1/10}'},
          options  => [qw(--domain),
-                      qw(--extraValuesPerPoint 1 --curvestyle 0), 'with errorbars'],
+                      qw(--extraValuesPerPoint 1 --with errorbars)],
          refplot  => <<'EOF' );
 
 
@@ -843,6 +896,103 @@ tryplot( testname => 'Error bars (using extraValuesPerPoint)',
 EOF
 
 
+tryplot( testname => 'Error bars (using rangesizeall)',
+         cmd      => q{seq 5 | gawk '{print $1,$1,$1/10}'},
+         options  => [qw(--domain),
+                      qw(--rangesizeall 2 --with errorbars)],
+         refplot  => <<'EOF' );
+
+
+  5.5 ++---------+-----------+----------+----------+----------+-----------+----------+---------**
+      +          +           +          +          +          +           +          +          *
+      |                                                                                         *
+    5 ++                                                                                       +A
+      |                                                                                         *
+      |                                                                                         *
+      |                                                                                         *
+  4.5 ++                                                                                       **
+      |                                                                  ***                    |
+      |                                                                   *                     |
+    4 ++                                                                  A                    ++
+      |                                                                   *                     |
+      |                                                                   *                     |
+      |                                                                  ***                    |
+  3.5 ++                                                                                       ++
+      |                                           ***                                           |
+      |                                            *                                            |
+    3 ++                                           A                                           ++
+      |                                            *                                            |
+      |                                            *                                            |
+      |                                           ***                                           |
+  2.5 ++                                                                                       ++
+      |                                                                                         |
+      |                     ***                                                                 |
+    2 ++                     A                                                                 ++
+      |                      *                                                                  |
+      |                     ***                                                                 |
+      |                                                                                         |
+  1.5 ++                                                                                       ++
+      |                                                                                         |
+      |                                                                                         |
+    1 A*                                                                                       ++
+      **                                                                                        |
+      |                                                                                         |
+      +          +           +          +          +          +           +          +          +
+  0.5 ++---------+-----------+----------+----------+----------+-----------+----------+---------++
+      1         1.5          2         2.5         3         3.5          4         4.5         5
+
+EOF
+
+
+tryplot( testname => 'Error bars (using rangesize, rangesizeall)',
+         cmd      => q{seq 5 | gawk '{print $1,"vert",$1,$1/10,"horiz",5-$1,$1-$1/5,$1+$1/20}'},
+         options  => [qw(--domain --dataid),
+                      qw(--rangesize vert 2 --rangesizeall 3 --with xerrorbars --style vert), 'with errorbars',
+                      qw(--xmin 1 --xmax 5 --ymin 0.5 --ymax 5.5)],
+         refplot  => <<'EOF' );
+
+
+    +-----------+----------+-----------+----------+-----------+----------+-----------+---------**
+    +           +          +           +          +           +          +           +          *
+    |                                                                                           *
+  5 ++                                                                                         +A
+    |                                                                                           *
+    |                                                                                           *
+    |                                                                                           *
+    |                                                                                          **
+    |                                                                   ***                     |
+    ##                                                                   *                      |
+  4 B#                                                                   A                     ++
+    ##                                                                   *                      |
+    |                                                                    *                      |
+    |                                                                   ***                     |
+    |                                                                                           |
+    |                                            ***                                            |
+    |             #          #                    *                                             |
+  3 ++            #########B##                    A                                            ++
+    |             #          #                    *                                             |
+    |                                             *                                             |
+    |                                            ***                                            |
+    |                                                                                           |
+    |                                                                                           |
+    |                     ***       #                #                                          |
+  2 ++                     A        ##############B###                                         ++
+    |                      *        #                #                                          |
+    |                     ***                                                                   |
+    |                                                                                           |
+    |                                                                                           |
+    |                                                                                           |
+    |                                                  #                      #                 |
+  1 A*                                                 ##################B#####                ++
+    **                                                 #                      #                 |
+    |                                                                                           |
+    +           +          +           +          +           +          +           +          +
+    +-----------+----------+-----------+----------+-----------+----------+-----------+----------+
+    1          1.5         2          2.5         3          3.5         4          4.5         5
+
+EOF
+
+
 SKIP:
 {
 
@@ -860,7 +1010,7 @@ skip "Skipping unreliable tests. Set RUN_ALL_TESTS environment variable to run t
 
 
 tryplot( testname => 'Histogram plot',
-         cmd      => q{seq 50 | awk '{print $1*$1}'},
+         cmd      => q{seq 50 | gawk '{print $1*$1}'},
          options  => [qw(--lines --points),
                       qw(--histo 0 --binwidth 50 --ymin 0 --curvestyleall), 'with boxes'],
          refplot  => <<'EOF' );
@@ -907,7 +1057,7 @@ tryplot( testname => 'Histogram plot',
 EOF
 
 tryplot( testname => 'Cumulative histogram',
-         cmd      => q{seq 50 | awk '{print $1*$1}'},
+         cmd      => q{seq 50 | gawk '{print $1*$1}'},
          options  => [qw(--lines --points),
                       qw(--histo 0 --histstyle cum --binwidth 50 --ymin 0 --curvestyleall), 'with boxes'],
          refplot  => <<'EOF' );
@@ -954,7 +1104,7 @@ tryplot( testname => 'Cumulative histogram',
 EOF
 
 tryplot( testname => 'Circles',
-         cmd      => q{seq 5 | awk '{print $1,$1,$1/10}'},
+         cmd      => q{seq 5 | gawk '{print $1,$1,$1/10}'},
          options  => [qw(--circles --domain)],
          refplot  => <<'EOF' );
 
@@ -1008,7 +1158,7 @@ note( "Starting to run streaming tests. These will take several seconds each" );
 # points, and then "exit", so I should have two frames worth of data plotted. I
 # pre-send a 0 so that the gnuplot autoscaling is always well-defined
 tryplot( testname => 'basic streaming test',
-         cmd      => q{seq 500 | awk 'BEGIN{ print 0; } {print (NR==3)? "exit" : $0; fflush(); system("sleep 1.2");}'},
+         cmd      => q{seq 500 | gawk 'BEGIN{ print 0; } {print (NR==3)? "exit" : $0; fflush(); system("sleep 1.2");}'},
          options  => [qw(--lines --points --stream)],
          refplot  => <<'EOF' );
 
@@ -1094,7 +1244,7 @@ tryplot( testname => 'basic streaming test',
 EOF
 
 tryplot( testname => 'basic streaming test, twice as fast',
-         cmd      => q{seq 500 | awk 'BEGIN{ print 0; } {print (NR==3)? "exit" : $0; fflush(); system("sleep 0.6");}'},
+         cmd      => q{seq 500 | gawk 'BEGIN{ print 0; } {print (NR==3)? "exit" : $0; fflush(); system("sleep 0.6");}'},
          options  => [qw(--lines --points --stream 0.4)],
          refplot  => <<'EOF' );
 
@@ -1181,7 +1331,7 @@ EOF
 
 
 tryplot( testname => 'streaming with --xlen',
-         cmd      => q{seq 500 | awk 'BEGIN{ print 0; } {print (NR==3)? "exit" : $0; fflush(); system("sleep 0.6");}'},
+         cmd      => q{seq 500 | gawk 'BEGIN{ print 0; } {print (NR==3)? "exit" : $0; fflush(); system("sleep 0.6");}'},
          options  => [qw(--lines --points --stream 0.4 --xlen 1.1)],
          refplot  => <<'EOF' );
 
@@ -1267,7 +1417,7 @@ tryplot( testname => 'streaming with --xlen',
 EOF
 
 tryplot( testname => 'streaming with --monotonic',
-         cmd      => q{seq 500 | awk '{if(NR==11) {print "exit";} else {x=(NR-1)%5; if(x==0) {print -1,-1;} print x,NR;}; fflush(); system("sleep 0.6");}'},
+         cmd      => q{seq 500 | gawk '{if(NR==11) {print "exit";} else {x=(NR-1)%5; if(x==0) {print -1,-1;} print x,NR;}; fflush(); system("sleep 0.6");}'},
          options  => [qw(--lines --points --stream 0.4 --domain --monotonic)],
          refplot  => <<'EOF' );
 
@@ -1673,7 +1823,7 @@ tryplot( testname => 'streaming with --monotonic',
 EOF
 
 tryplot( testname => '--timefmt streaming plot with --xlen',
-         cmd      => q{seq 5 | awk 'BEGIN{ print strftime("%d %b %Y %T",1382249107-1,1),-4;} {if(NR==3) {print "exit";} else{ print strftime("%d %b %Y %T",1382249107+$1,1),$1;} fflush(); system("sleep 0.6")}'},
+         cmd      => q{seq 5 | gawk 'BEGIN{ print strftime("%d %b %Y %T",1382249107-1,1),-4;} {if(NR==3) {print "exit";} else{ print strftime("%d %b %Y %T",1382249107+$1,1),$1;} fflush(); system("sleep 0.6")}'},
          options  => ['--points', '--lines',
                       '--domain', '--timefmt', '%d %b %Y %H:%M:%S',
                       qw(--stream 0.4 --xlen 3)],
@@ -1761,7 +1911,7 @@ tryplot( testname => '--timefmt streaming plot with --xlen',
 EOF
 
 tryplot( testname => '--timefmt streaming plot with --monotonic',
-         cmd      => q{seq 10 | awk '{x=(NR-1)%5; if(x==0) {print strftime("%d %b %Y %T",1382249107-1,-4),-4;} print strftime("%d %b %Y %T",1382249107+x,1),NR; fflush(); system("sleep 0.6")}'},
+         cmd      => q{seq 10 | gawk '{x=(NR-1)%5; if(x==0) {print strftime("%d %b %Y %T",1382249107-1,-4),-4;} print strftime("%d %b %Y %T",1382249107+x,1),NR; fflush(); system("sleep 0.6")}'},
          options  => ['--points', '--lines',
                       '--domain', '--timefmt', '%d %b %Y %H:%M:%S',
                       qw(--stream 0.4 --monotonic)],
@@ -2177,7 +2327,7 @@ sub tryplot
   my %args = @_;
 
   my @options = ('--exit',
-                 '--extracmds', 'unset grid',
+                 qw(--unset grid),
                  '--terminal', 'dumb 100,40');
   unshift @options, @{$args{options}};