From e71642c590107fa3d167281d2371ee12530ed51b Mon Sep 17 00:00:00 2001
From: Mark Old <dlom234@gmail.com>
Date: Wed, 25 Apr 2012 00:38:13 -0700
Subject: [PATCH] Add checks for repeating strings of characters

---
 bin/shamazing    | 25 ++++++++++++++++++-------
 lib/shamazing.rb | 29 +++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+), 7 deletions(-)

diff --git a/bin/shamazing b/bin/shamazing
index c82f4df..13ab479 100755
--- a/bin/shamazing
+++ b/bin/shamazing
@@ -25,9 +25,10 @@ require 'shamazing'
 require 'rugged'
 
 options = {
-  :string  => false,
-  :integer => false,
-  :full    => false
+  :string    => false,
+  :integer   => false,
+  :repeating => false,
+  :full      => false
 }
 
 parser = OptionParser.new do |opts|
@@ -47,6 +48,10 @@ parser = OptionParser.new do |opts|
     options[:integer] = true
   end
 
+  opts.on("-r", "--repeating", "The longest repeating string of characters in this SHA") do
+    options[:repeating] = true
+  end
+
   opts.on("-f", "--full", "Display full SHAs instead of snippets") do
     options[:full] = true
   end
@@ -64,23 +69,29 @@ if ARGV.empty?
   repo = Rugged::Repository.new('.')
   shas = repo.walk(repo.head.target).map(&:oid)
 
-  if options[:string] && !options[:integer]
+  if options[:string] && !options[:integer] && !options[:repeating]
     puts Shamazing.string_from_array(shas,options[:full])
-  elsif options[:integer]
+  elsif options[:integer] && !options[:repeating]
     puts Shamazing.integer_from_array(shas,options[:full])
+  elsif options[:repeating]
+    puts Shamazing.repeating_from_array(shas,options[:full])
   else
     puts "Longest string: #{Shamazing.string_from_array(shas,options[:full])}"
     puts "Longest integer: #{Shamazing.integer_from_array(shas,options[:full])}"
+    puts "Longest repeating: #{Shamazing.repeating_from_array(shas,options[:full])}"
   end
 else
   sha = ARGV.first
 
-  if options[:string] && !options[:integer]
+  if options[:string] && !options[:integer] && !options[:repeating]
     puts Shamazing.string(sha)
-  elsif options[:integer]
+  elsif options[:integer] && !options[:repeating]
     puts Shamazing.integer(sha)
+  elsif options[:repeating]
+    puts Shamazing.repeating(sha)
   else
     puts "Longest string: #{Shamazing.string(sha)}"
     puts "Longest integer: #{Shamazing.integer(sha)}"
+    puts "Longest repeating: #{Shamazing.repeating(sha)}"
   end
 end
diff --git a/lib/shamazing.rb b/lib/shamazing.rb
index 04f91d6..02cb617 100644
--- a/lib/shamazing.rb
+++ b/lib/shamazing.rb
@@ -53,4 +53,33 @@ def self.integer_from_array(shas,full=false)
       first.to_i
     full ? shas.find{|sha| sha.match(/#{longest}/)} : longest
   end
+
+  # Finds the longest repeating string of characters in a SHA.
+  #
+  # sha - The String SHA to analyze.
+  #
+  # Returns a String.
+  def self.repeating(sha)
+    sha.
+      downcase.
+      scan(/(\w)(\1+)/).
+      collect{|a| a.join}.
+      sort{|a,b| b.length <=> a.length}.
+      first
+  end
+
+  # Finds the longest repeating string of characters in an Array of  SHAs.
+  #
+  # sha - The String SHA to analyze.
+  # full - A Boolean: should we return the full SHA instead of the snippet?
+  #
+  # Returns the longest String.
+  def self.repeating_from_array(shas,full=false)
+    longest = shas.
+      collect{|sha| repeating(sha)}.
+      delete_if{|sha| sha.nil?}.
+      sort{|a,b| b.length <=> a.length}.
+      first
+    full ? shas.find{|sha| sha.match(/#{longest}/)} : longest
+  end
 end
\ No newline at end of file