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#!/usr/bin/perl
#
# This tool will print vaguely pretty information about a pack.  It
# expects the output of "git verify-pack -v" as input on stdin.
#
# $ git verify-pack -v | packinfo.pl
#
# This prints some full-pack statistics; currently "all sizes", "all
# path sizes", "tree sizes", "tree path sizes", and "depths".
#
# * "all sizes" stats are across every object size in the file;
#   full sizes for base objects, and delta size for deltas.
# * "all path sizes" stats are across all object's "path sizes".
#   A path size is the sum of the size of the delta chain, including the
#   base object.  In other words, it's how many bytes need be read to
#   reassemble the file from deltas.
# * "tree sizes" are object sizes grouped into delta trees.
# * "tree path sizes" are path sizes grouped into delta trees.
# * "depths" should be obvious.
#
# When run as:
#
# $ git verify-pack -v | packinfo.pl -tree
#
# the trees of objects are output along with the stats.  This looks
# like:
#
#   0 commit 031321c6...      803      803
#
#   0   blob 03156f21...     1767     1767
#   1    blob f52a9d7f...       10     1777
#   2     blob a8cc5739...       51     1828
#   3      blob 660e90b1...       15     1843
#   4       blob 0cb8e3bb...       33     1876
#   2     blob e48607f0...      311     2088
#      size: count 6 total 2187 min 10 max 1767 mean 364.50 median 51 std_dev 635.85
# path size: count 6 total 11179 min 1767 max 2088 mean 1863.17 median 1843 std_dev 107.26
#
# The first number after the sha1 is the object size, the second
# number is the path size.  The statistics are across all objects in
# the previous delta tree.  Obviously they are omitted for trees of
# one object.
#
# When run as:
#
# $ git verify-pack -v | packinfo.pl -tree -filenames
#
# it adds filenames to the tree.  Getting this information is slow:
#
#   0   blob 03156f21...     1767     1767 Documentation/git-lost-found.txt @ tags/v1.2.0~142
#   1    blob f52a9d7f...       10     1777 Documentation/git-lost-found.txt @ tags/v1.5.0-rc1~74
#   2     blob a8cc5739...       51     1828 Documentation/git-lost+found.txt @ tags/v0.99.9h^0
#   3      blob 660e90b1...       15     1843 Documentation/git-lost+found.txt @ master~3222^2~2
#   4       blob 0cb8e3bb...       33     1876 Documentation/git-lost+found.txt @ master~3222^2~3
#   2     blob e48607f0...      311     2088 Documentation/git-lost-found.txt @ tags/v1.5.2-rc3~4
#      size: count 6 total 2187 min 10 max 1767 mean 364.50 median 51 std_dev 635.85
# path size: count 6 total 11179 min 1767 max 2088 mean 1863.17 median 1843 std_dev 107.26
#
# When run as:
#
# $ git verify-pack -v | packinfo.pl -dump
#
# it prints out "sha1 size pathsize depth" for each sha1 in lexical
# order.
#
# 000079a2eaef17b7eae70e1f0f635557ea67b644 30 472 7
# 00013cafe6980411aa6fdd940784917b5ff50f0a 44 1542 4
# 000182eacf99cde27d5916aa415921924b82972c 499 499 0
# ...
#
# This is handy for comparing two packs.  Adding "-filenames" will add
# filenames, as per "-tree -filenames" above.

use strict;
use Getopt::Long;

my $filenames = 0;
my $tree = 0;
my $dump = 0;
GetOptions("tree" => \$tree,
           "filenames" => \$filenames,
           "dump" => \$dump);

my %parents;
my %children;
my %sizes;
my @roots;
my %paths;
my %types;
my @commits;
my %names;
my %depths;
my @depths;

while (<STDIN>) {
    my ($sha1, $type, $size, $space, $offset, $depth, $parent) = split(/\s+/, $_);
    next unless ($sha1 =~ /^[0-9a-f]{40}$/);
    $depths{$sha1} = $depth || 0;
    push(@depths, $depth || 0);
    push(@commits, $sha1) if ($type eq 'commit');
    push(@roots, $sha1) unless $parent;
    $parents{$sha1} = $parent;
    $types{$sha1} = $type;
    push(@{$children{$parent}}, $sha1);
    $sizes{$sha1} = $size;
}

if ($filenames && ($tree || $dump)) {
    open(NAMES, "git name-rev --all|");
    while (<NAMES>) {
        if (/^(\S+)\s+(.*)$/) {
            my ($sha1, $name) = ($1, $2);
            $names{$sha1} = $name;
        }
    }
    close NAMES;

    for my $commit (@commits) {
        my $name = $names{$commit};
        open(TREE, "git ls-tree -t -r $commit|");
        print STDERR "Plumbing tree $name\n";
        while (<TREE>) {
            if (/^(\S+)\s+(\S+)\s+(\S+)\s+(.*)$/) {
                my ($mode, $type, $sha1, $path) = ($1, $2, $3, $4);
                $paths{$sha1} = "$path @ $name";
            }
        }
        close TREE;
    }
}

sub stats {
    my @data = sort {$a <=> $b} @_;
    my $min = $data[0];
    my $max = $data[$#data];
    my $total = 0;
    my $count = scalar @data;
    for my $datum (@data) {
        $total += $datum;
    }
    my $mean = $total / $count;
    my $median = $data[int(@data / 2)];
    my $diff_sum = 0;
    for my $datum (@data) {
        $diff_sum += ($datum - $mean)**2;
    }
    my $std_dev = sqrt($diff_sum / $count);
    return ($count, $total, $min, $max, $mean, $median, $std_dev);
}

sub print_stats {
    my $name = shift;
    my ($count, $total, $min, $max, $mean, $median, $std_dev) = stats(@_);
    printf("%s: count %s total %s min %s max %s mean %.2f median %s std_dev %.2f\n",
           $name, $count, $total, $min, $max, $mean, $median, $std_dev);
}

my @sizes;
my @path_sizes;
my @all_sizes;
my @all_path_sizes;
my %path_sizes;

sub dig {
    my ($sha1, $depth, $path_size) = @_;
    $path_size += $sizes{$sha1};
    push(@sizes, $sizes{$sha1});
    push(@all_sizes, $sizes{$sha1});
    push(@path_sizes, $path_size);
    push(@all_path_sizes, $path_size);
    $path_sizes{$sha1} = $path_size;
    if ($tree) {
        printf("%3d%s %6s %s %8d %8d %s\n",
               $depth, (" " x $depth), $types{$sha1},
               $sha1, $sizes{$sha1}, $path_size, $paths{$sha1});
    }
    for my $child (@{$children{$sha1}}) {
        dig($child, $depth + 1, $path_size);
    }
}

my @tree_sizes;
my @tree_path_sizes;

for my $root (@roots) {
    undef @sizes;
    undef @path_sizes;
    dig($root, 0, 0);
    my ($aa, $sz_total) = stats(@sizes);
    my ($bb, $psz_total) = stats(@path_sizes);
    push(@tree_sizes, $sz_total);
    push(@tree_path_sizes, $psz_total);
    if ($tree) {
        if (@sizes > 1) {
            print_stats("     size", @sizes);
            print_stats("path size", @path_sizes);
        }
        print "\n";
    }
}

if ($dump) {
    for my $sha1 (sort keys %sizes) {
        print "$sha1 $sizes{$sha1} $path_sizes{$sha1} $depths{$sha1} $paths{$sha1}\n";
    }
} else {
    print_stats("      all sizes", @all_sizes);
    print_stats(" all path sizes", @all_path_sizes);
    print_stats("     tree sizes", @tree_sizes);
    print_stats("tree path sizes", @tree_path_sizes);
    print_stats("         depths", @depths);
}