Progress(3)

NAME
Time::Progress - Elapsed and estimated finish time reporting.

SYNOPSIS
  use Time::Progress;
  # autoflush to get \r working
  $| = 1;
  # get new `timer'
  my $p = new Time::Progress;

  # restart and report progress
  $p->restart;
  sleep 5; # or do some work here
  print $p->report( "done %p elapsed: %L (%l sec), ETA %E (%e sec)\n", 50 );

  # set min and max values
  $p->attr( min => 2, max => 20 );
  # restart `timer'
  $p->restart;
  my $c;
  for( $c = 2; $c <= 20; $c++ )
    {
    # print progress bar and percentage done
    print $p->report( "eta: %E min, %40b %p\r", $c );
    sleep 1; # work...
    }
  # stop timer
  $p->stop;

  # report times
  print $p->elapsed_str;

DESCRIPTION
Shortest time interval that can be measured is 1 second. The available methods are:

new
      my $p = new Time::Progress;

    Returns new object of Time::Progress class and starts the timer. It also sets min and max values to 0 and 100, so the next report calls will default to percents range.

restart
    restarts the timer and clears the stop mark. optionally restart() may act also as attr() for setting attributes:

      $p->restart( min => 1, max => 5 );

    is the same as:

      $p->attr( min => 1, max => 5 );
      $p->restart();

    If you need to count things, you can set just 'max' attribute since 'min' is already set to 0 when object is constructed by new():

      $p->restart( max => 42 );

stop
    Sets the stop mark. this is only useful if you do some work, then finish, then do some work that shouldn't be timed and finally report. Something like:

      $p->restart;
      # do some work here...
      $p->stop;
      # do some post-work here
      print $p->report;
      # `post-work' will not be timed

    Stop is useless if you want to report time as soon as work is finished like:

      $p->restart;
      # do some work here...
      print $p->report;

continue
    Clears the stop mark. (mostly useless, perhaps you need to restart?)

attr
    Sets and returns internal values for attributes. Available attributes are:

    min This is the min value of the items that will follow (used to calculate estimated finish time)

    max This is the max value of all items in the even (also used to calculate estimated finish time)

    format
        This is the default report format. It is used if report is called without parameters.

    attr returns array of the set attributes:

      my ( $new_min, $new_max ) = $p->attr( min => 1, max => 5 );

    If you want just to get values use undef:

      my $old_format = $p->attr( format => undef );

    This way of handling attributes is a bit heavy but saves a lot of attribute handling functions. attr will complain if you pass odd number of parameters.

report
    report is the most complex method in this package. :)

    expected arguments are:

      $p->report( format, [current_item] );

    format is string that will be used for the result string. Recognized special sequences are:

    %l  elapsed seconds

    %L  elapsed time in minutes in format MM:SS

    %e  remaining seconds

    %E  remaining time in minutes in format MM:SS

    %p  percentage done in format PPP.P%

    %f  estimated finish time in format returned by localtime()

    %b
    %B  progress bar which looks like:

          ##############......................

        %b takes optional width:

          %40b -- 40-chars wide bar
          %9b  --  9-chars wide bar
          %b   -- 79-chars wide bar (default)

    Parameters can be ommited and then default format set with attr will be used.

    Sequences 'L', 'l', 'E' and 'e' can have width also:

      %10e
      %5l
      ...

    Estimate time calculations can be used only if min and max values are set (see attr method) and current item is passed to report! if you want to use the default format but still have estimates use it like this:

      $p->format( undef, 45 );

    If you don't give current item (step) or didn't set proper min/max value then all estimate sequences will have value `n/a'.

    You can freely mix reports during the same event.

elapsed
estimate
    helpers -- return elapsed/estimate seconds.

elapsed_str
estimate_str
    helpers -- return elapsed/estimated string in format:

      "elapsed time is MM:SS min.\n"
      "remaining time is MM:SS min.\n"

    all helpers need one argument--current item.

FORMAT EXAMPLES
  # $c is current element (step) reached
  # for the examples: min = 0, max = 100, $c = 33.3

  print $p->report( "done %p elapsed: %L (%l sec), ETA %E (%e sec)\n", $c );
  # prints:
  # done  33.3% elapsed time   0:05 (5 sec), ETA   0:07 (7 sec)

  print $p->report( "%45b %p\r", $c );
  # prints:
  # ###############..............................  33.3%

  print $p->report( "done %p ETA %f\n", $c );
  # prints:
  # done  33.3% ETA Sun Oct 21 16:50:57 2001

AUTHOR
  Vladi Belperchinov-Shabanski "Cade"

  <cade@biscom.net> <cade@datamax.bg> <cade@cpan.org>

  http://cade.datamax.bg