#!/usr/bin/perl
#
# git-graph.pl - Generate an ascii graph of git repository activity
#
# Copyright (C) 2008 James Bowes <jbowes@dangerouslyinc.com>
#
# Graphing routine Adapted from http://www.perlmonks.org/?node_id=336907

sub get_activity {
    my $day = shift;
    my $git_cmd = 'git diff --shortstat "@{' . ($day + 1) .' day ago}" "@{' .
                  ($day or "0") . ' day ago}"';
    $res = `$git_cmd 2> /dev/null`;

    $res =~ /, (.*?) insertions\(\+\), (.*?) deletions\(-\)/;
    $activity = $1 + $2;
    
    return $activity;
}

@deltas = ();
foreach $day (0..70) {
    push (@deltas, get_activity ($day));
}

print ("\n");
print graph(@deltas);
print ("\n");


sub graph {
  my( $i, $magic, $m, $p, $top, @g ) = ( 0, 20, 7, 70, 0, () );

  foreach $pad (0..($p - scalar(@_))) {
      push (@_, 0);
  }
 
  @_ = reverse @_; 
  
  for (0..($p)) {
      $top = ($top > $_[$_]) ? $top : $_[$_];
  }
  
  $top = $top - ($top % 100) + 100;
  
  my $s = $top > $magic ? ( $top / $magic ) : 1;  ### calculate scale

  for (0..$magic) {
    $g[$_] = sprintf("%" . ($m - 1) . "d |", $_ * $s) .
             ($_ % 5 == 0 ? '_' : ' ') x ($p);
    for $i (0..($p)) {
        substr($g[$_], ($i + $m), 1) = '#' if ($_[$i] / $s) > $_;
    }
  }
  join( "\n", reverse( @g ), ' Date:  ' . '^^^^^^|' x ( $p / 7 ));  
}  # end sub graph

__END__