Десислава обнови решението на 15.11.2015 23:14 (преди над 8 години)
+require 'date'
+require 'digest/sha1'
+
+
+class ObjectStore
+
+ class Result
+ attr_reader :message, :result
+ attr_writer :result
+
+ def initialize(message, success, error, result = nil)
+ @message = message
+ @success = success
+ @error = error
+ @result = result
+ end
+
+ def success?
+ @success
+ end
+
+ def error?
+ @error
+ end
+ end
+
+ class Repository
+
+ class Commit
+ attr_accessor :commit_files
+ attr_reader :message, :date, :hash
+
+ def initialize(files, hash, message, date)
+ @hash = hash
+ @commit_files = files
+ @message = message
+ @date = date
+ end
+
+ def objects
+ @commit_files
+ end
+ end
+
+ class Branch
+ attr_accessor :added_files, :removed_files, :changed_files, :commits
+ attr_reader :name
+
+ def initialize(name, commits = [])
+ @name = name
+ @commits = commits
+ @added_files = {}
+ @removed_files = {}
+ @changed_files = 0
+ end
+
+ def clean_files
+ @added_files = {}
+ @removed_files = {}
+ @changed_files = 0
+ end
+
+ def add_file(name, object)
+ @changed_files += 1 unless @added_files.has_key?(name)
+ @added_files[name] = object
+ message = "Added #{name} to stage."
+ Result.new(message, true, false, object)
+ end
+
+ def remove_file(name)
+ if @added_files.has_key?(name)
+ removed = @added_files.delete(name)
+ elsif not @commits.empty? and @commits.last.commit_files.has_key?(name)
+ removed = @commits.last.commit_files.delete(name)
+ else
+ return Result.new("Object #{name} is not committed.", false, true)
+ end
+ @changed_files += 1
+ Result.new("Added #{name} for removal." , true, false, removed)
+ end
+
+ def make_commit_files
+ if @commits.empty?
+ all_data = @added_files
+ else
+ all_data = @commits.last.commit_files.merge(@added_files)
+ end
+ all_data.delete_if{|key, value| @removed_files.has_key?(key)}
+ end
+
+ def make_new_commit(message, date)
+ if @changed_files == 0
+ return Result.new("Nothing to commit, working directory clean.",
+ false,
+ true)
+ end
+
+ hash = Digest::SHA1.hexdigest(date.to_s + message)
+
+ @commits << Commit.new(make_commit_files, hash, message, date)
+ result = Result.new("#{message}\n\t#{@changed_files} objects changed",
+ true, false, @commits.last)
+ clean_files
+ result
+ end
+
+ def checkout(hash)
+ index_commit = @commits.index{|x| x.hash == hash}
+ if index_commit.nil?
+ Result.new("Commit #{hash} does not exist.", false, true)
+ else
+ @commits = @commits.take(index_commit + 1)
+ Result.new("HEAD is now at #{hash}.", true, false, @commits.last)
+ end
+ end
+ end
+
+ class BranchManager
+
+ attr_reader :current_branch, :branches
+ def initialize
+ @current_branch = Branch.new("master")
+ @branches = {"master": @current_branch}
+ end
+
+ def add(name, object)
+ @current_branch.add_file(name, object)
+ end
+
+ def commit(message, date)
+ @current_branch.make_new_commit(message, date)
+ end
+
+ def remove_file(name)
+ @current_branch.remove_file(name)
+ end
+
+ def checkout_hash(hash)
+ @current_branch.checkout(hash)
+ end
+
+ def create(branch_name)
+ if @branches.has_key?(branch_name)
+ Result.new("Branch #{branch_name} already exists.", false, true)
+ else
+ new_branch = Branch.new(branch_name, @current_branch.commits.clone)
+ @branches[branch_name] = new_branch
+ Result.new("Created branch #{branch_name}.", true, false, new_branch)
+ end
+ end
+
+ def checkout(branch_name)
+ if @branches.has_key?(branch_name)
+ @current_branch = @branches[branch_name]
+ Result.new("Switched to branch #{branch_name}.",
+ true,
+ false,
+ @current_branch)
+ else
+ Result.new("Branch #{branch_name} does not exist.", false, true)
+ end
+ end
+
+ def remove(branch_name)
+ if not @branches.has_key?(branch_name)
+ Result.new("Branch #{branch_name} does not exist.", false, true)
+ elsif @current_branch.name == branch_name
+ Result.new("Cannot remove current branch.", false, true)
+ else
+ removed_branch = @branches.delete(branch_name)
+ Result.new("Removed branch #{branch_name}.",
+ true,
+ false,
+ removed_branch)
+ end
+ end
+
+ def list
+ names = @branches.keys.map(&:to_s).sort
+ result = names.reduce("") do |message, name|
+ if name == @current_branch.name
+ message += "\n* " + name
+ else
+ message += "\n " + name
+ end
+ end
+ Result.new(result[1..-1], true, false)
+ end
+
+ def log
+ if @current_branch.commits.empty?
+ mess = "Branch #{@current_branch.name} does not have any commits yet."
+ Result.new(mess, false, true)
+ else
+ message = @current_branch.commits.reduce("") do |mess, commit|
+ mess + "Commit #{commit.hash}\n" \
+ "Date: #{commit.date}\n\n\t#{commit.message}"
+ end
+ Result.new(message, true, false)
+ end
+ end
+
+ def head
+ if @current_branch.commits.empty?
+ Result.new("Branch #{@current_branch.name}" \
+ " does not have any commits yet.", false, true)
+ else
+ last_commit = @current_branch.commits.last
+ Result.new(last_commit.message, true, false, last_commit)
+ end
+ end
+
+ def get(name)
+ result_mistake = Result.new("Object #{name} is not committed.",
+ false,
+ true)
+ if @current_branch.commits.empty?
+ return result_mistake
+ end
+
+ if @current_branch.commits.last.objects.has_key?(name)
+ object = @current_branch.commits.last.objects[name]
+ else
+ return result_mistake
+ end
+ Result.new("Found object #{name}.", true, false, object)
+ end
+ end
+
+ attr_reader :branch_manager
+ def initialize
+ @branch_manager = BranchManager.new
+ end
+
+ def add(name, object)
+ @branch_manager.add(name, object)
+ end
+
+ def commit(message)
+ date = DateTime.now.strftime("%a %b %e %k:%M %Y %z")
+ @branch_manager.commit(message, date)
+ end
+
+ def remove(name)
+ @branch_manager.remove_file(name)
+ end
+
+ def checkout(hash)
+ @branch_manager.checkout_hash(hash)
+ end
+
+ def branch
+ @branch_manager
+ end
+
+ def log
+ @branch_manager.log
+ end
+
+ def head
+ @branch_manager.head
+ end
+
+ def get(name)
+ @branch_manager.get(name)
+ end
+ end
+
+ class << self
+ def init(&block)
+ repo = Repository.new
+ return repo if not block_given?
+ repo.instance_eval(&block)
+ repo
+ end
+ end
+end