gistfile1.txt

   # Maturity (Past)
      # 45% = Number of releases
      # 25% = Life span (last minus first release date)
      # 20% = Size of code
      # 10% = Test Pass percentage (global)
      # TODO: Number of resolved RT/GH tickets

   # Stability (Present)
      # 45% = Last release span (now minus last release date)
      # 35% = Test Pass percentage (this version)
      # 20% = Average CPAN rating
      # TODO: Kwalitee/CPANTS scoring

   # Sustainability (Future)
      # 40% = Author's last release date
      # 35% = Stability score
      # 25% = Number of modules that depend on this
      # TODO: Number of open RT/GH tickets
      # TODO: Oldest open RT/GH ticket date (non-wistlist)

DBI:
         Maturity: 99%  (Great)
        Stability: 97%  (Great)
   Sustainability: 89%  (Great)

DBIx::Class:
         Maturity: 94%  (Great)
        Stability: 78%  (Good)
   Sustainability: 82%  (Great)

perl:
         Maturity: 94%  (Great)
        Stability: 78%  (Good)
   Sustainability: 82%  (Great)

Pod::Coverage::TrustPod:
         Maturity: 70%  (Good)
        Stability: 91%  (Great)
   Sustainability: 86%  (Great)

subs::auto:
         Maturity: 46%  (Average)
        Stability: 83%  (Great)
   Sustainability: 79%  (Good)

Devel::Carp:
         Maturity: 25%  (Poor)
        Stability: 46%  (Average)
   Sustainability: 42%  (Average)

AnyData:
         Maturity: 61%  (Good)
        Stability: 57%  (Average)
   Sustainability: 37%  (Poor)

Net::SSH:
         Maturity: 65%  (Good)
        Stability: 80%  (Great)
   Sustainability: 82%  (Great)

Mail::IMAPClient:
         Maturity: 98%  (Great)
        Stability: 96%  (Great)
   Sustainability: 88%  (Great)

XML::Smart:
         Maturity: 72%  (Good)
        Stability: 65%  (Good)
   Sustainability: 22%  (Poor)

Proc::ProcessTable:
         Maturity: 86%  (Great)
        Stability: 70%  (Good)
   Sustainability: 79%  (Good)

Net::IRC:
         Maturity: 90%  (Great)
        Stability: 87%  (Great)
   Sustainability: 60%  (Good)

Net::MacMap:
         Maturity: 25%  (Poor)
        Stability: 46%  (Average)
   Sustainability: 41%  (Average)

Net::ARP:
         Maturity: 73%  (Good)
        Stability: 40%  (Average)
   Sustainability: 27%  (Poor)

pop:
         Maturity: 34%  (Poor)
        Stability: 47%  (Average)
   Sustainability: 46%  (Average)

MetaCPAN-mortality.pl

use v5.10;
use MetaCPAN::API;
use Data::Dumper;
use List::AllUtils qw(min max);
use DateTime;
use DateTime::Format::ISO8601;

my @score_label = qw(
   Abysmal
   Poor
   Average
   Good
   Great
);

# Example modules:
#   Very stable: DBI, DBIx::Class, perl
#   Newer but stable: Pod::Coverage::TrustPod
#   Older but stable: subs::auto, Devel::Carp, AnyData
#   Average: Net::SSH, Mail::IMAPClient 
#   Broken: XML::Smart, Proc::ProcessTable
#   Abandoned: Net::IRC
#   DEPRECATED: Dancer::Plugin::DebugDump
#   Bad all around: Net::MacMap, Net::ARP, pop

my @modules = qw(
   DBI DBIx::Class perl
   Pod::Coverage::TrustPod
   subs::auto Devel::Carp AnyData
   Net::SSH Mail::IMAPClient
   XML::Smart
   Proc::ProcessTable
   Net::IRC
   Net::MacMap
   Net::ARP
   pop
);

my $dp = DateTime::Format::ISO8601->new();
my $mcpan = MetaCPAN::API->new();
foreach my $module (@modules) {
   (my $dist_name = $module) =~ s/::/-/g;

   my $latest_release = $mcpan->release( distribution => $dist_name );
   my $global_testing = $mcpan->release(
      search => {
         size   => 0,
         query  => { filtered => {
            query  => {match_all => {}},
            filter => { term => { distribution => $dist_name } },
         }},
         facets => {
            pass => { statistical => { field => 'tests.pass' } },
            fail => { statistical => { field => 'tests.fail' } },
         },
      }
   )->{facets};
   
   my $score_vars = {
      maturity => {
         code_size     => $latest_release->{stat}{size},
         num_releases  => $mcpan->release( search => { q => "distribution:$dist_name", size => 0, } )->{hits}{total},
         last_release  => $latest_release->{date},
         first_release => $mcpan->release(
            search => {
               q      => "distribution:$dist_name",
               fields => 'date',
               sort   => 'date:asc',
               size   => 1,
            }
         )->{hits}{hits}[0]{fields}{date},
         test_pass_global => $global_testing->{pass}{total},
         test_fail_global => $global_testing->{fail}{total},
         test_ttl_global  => $global_testing->{pass}{total} + $global_testing->{fail}{total},
         # Number of resolved RT/GH tickets === needs another module
      },
      stability => {
         last_release     => $latest_release->{date},
         test_pass_latest => $latest_release->{tests}{pass},
         test_fail_latest => $latest_release->{tests}{fail},
         test_ttl_latest  => $latest_release->{tests}{pass} + $latest_release->{tests}{fail},
         avg_cpan_rating  => $mcpan->rating(
            search => {
               size   => 0,
               query  => { filtered => {
                  query  => {match_all => {}},
                  filter => { term => { distribution => $dist_name } },
               }},
               facets => {
                  rating => { statistical => { field => 'rating' } },
               },
            }
         )->{facets}{rating}{mean} || 3,
         # Kwalitee/CPANTS scoring === not sure where this is
      },
      sustainability => {
         reverse_depend      => $mcpan->release( search => { q => "release.dependency.module:\"$module\"", size => 0, } )->{hits}{total},
         author_last_release => $mcpan->release(
            search => {
               q      => "author:".$latest_release->{author},
               fields => 'date',
               sort   => 'date:desc',
               size   => 1,
            }
         )->{hits}{hits}[0]{fields}{date},
         # Number of open RT/GH tickets === needs another module
         # Oldest open RT/GH ticket date (non-wistlist) === needs another module
      },
   };
   
   # Score calculating
   
   # Maturity (Past)
      # 45% = Number of releases
      # 25% = Life span (last minus first release date)
      # 20% = Size of code
      # 10% = Test Pass percentage (global)
      # TODO: Number of resolved RT/GH tickets
   my $lvl = $score_vars->{maturity};
   $lvl->{life_span} = $dp->parse_datetime($lvl->{last_release}) - $dp->parse_datetime($lvl->{first_release});
   $lvl->{pass_per}  = $lvl->{test_pass_global} / ($lvl->{test_ttl_global} || 1);
   $lvl->{_score} = 
      # Number of releases = standard scale (max 15)
      min($lvl->{num_releases}, 15)                  /    15 * 45 +
      # Life span          = standard scale (max 60 months)
      min($lvl->{life_span}->in_units('months'), 60) /    60 * 25 +
      # Size of code       = SQRT scale (max 200K)
      sqrt(min($lvl->{code_size}, 200000))          / 447.22 * 20 +
      # Test Pass %        = square scale (vs. fractions = downward slope)
      $lvl->{pass_per} ** 2                                  * 10
   ;

   # Stability (Present)
      # 45% = Last release span (now minus last release date)
      # 35% = Test Pass percentage (this version)
      # 20% = Average CPAN rating
      # TODO: Kwalitee/CPANTS scoring
   $lvl = $score_vars->{stability};
   $lvl->{last_span} = DateTime->now - $dp->parse_datetime($lvl->{last_release});
   $lvl->{pass_per}  = $lvl->{test_ttl_latest} ? $lvl->{test_pass_latest} / $lvl->{test_ttl_latest} : $score_vars->{maturity}{pass_per};
   $lvl->{_score} = 
      # Last release span   = inverse square scale (max 10 years)
      max(1315 - $lvl->{last_span}->in_units('months') ** 1.5, 0) / 1315 * 45 +
      # Test Pass %         = square scale (vs. fractions = downward slope)
      $lvl->{pass_per} ** 2                                 * 35 +
      # Average CPAN rating = standard scale (max 5)
      $lvl->{avg_cpan_rating}                       /     5 * 20
   ;

   # Sustainability (Future)
      # 40% = Author's last release date
      # 35% = Stability score
      # 25% = Number of modules that depend on this
      # TODO: Number of open RT/GH tickets
      # TODO: Oldest open RT/GH ticket date (non-wistlist)
   $lvl = $score_vars->{sustainability};
   $lvl->{last_span} = DateTime->now - $dp->parse_datetime($lvl->{author_last_release});
   $lvl->{_score} = 
      # Author's last release date = inverse square scale (pivot at 5 years; could go into negative)
      (465 - $lvl->{last_span}->in_units('months') ** 1.5) / 465 * 30 +
      # Stability score
      $score_vars->{stability}{_score}                     / 100 * 35 +
      # Reverse dependencies = inverse reciprocal scale
      ($lvl->{reverse_depend} ? 
         (1 - 1/$lvl->{reverse_depend}) * 25 :
         0
      )
   ;
   
   # Print score results
   say "$module:";
   foreach my $type (qw(maturity stability sustainability)) {
      printf "   %14s: %2u%%  (%s)\n", ucfirst $type, $score_vars->{$type}{_score}, $score_label[int( $score_vars->{$type}{_score} / 20 )];
   }
   say;

   #say Data::Dumper->new([$score_vars], [$module])->Indent(1)->Pad('   ')->Sortkeys(1)->Dump();
}