Станимира обнови решението на 18.11.2015 23:13 (преди над 8 години)
+require 'digest/sha1'
+
+class OperationMessage
+ attr_reader :message, :result
+
+ def initialize(successful, message, result = nil)
+ @successful = successful
+ @message = message
+ @result = result
+ end
+
+ def success?
+ @successful
+ end
+
+ def error?
+ not @successful
+ end
+end
+
+class Commit
+ attr_reader :index, :date, :message, :hash, :files, :objects
+ @@commits_count = 0
+
+ def initialize(message, stage, repository_files)
+ @index = @@commits_count
+ @date = Time.now
+ @message = message
+ @hash = Digest::SHA1.hexdigest "#{date}#{message}"
+ @files = {
+ changed: stage[:changed].dup,
+ removed: stage[:removed].dup,
+ }
+ @objects = repository_files.values
+
+ @@commits_count += 1
+ end
+
+ def changed
+ @files[:changed]
+ end
+
+ def removed
+ @files[:removed]
+ end
+
+ def to_s
+ name = "Commit #{@hash}\n"
+ date = "Date: #{@date.strftime('%a %b %-d %H:%M %Y %z')}\n\n"
+ message = "\t#{@message}\n\n"
+
+ name << date << message
+ end
+end
+
+class Branch
+ attr_reader :current
+
+ def initialize
+ @current = :master
+ @branches = {@current => []}
+ @files = {@current => {}}
+ end
+
+ def create(name)
+ name = name.to_sym
+
+ if @branches.has_key?(name)
+ OperationMessage.new(false, "Branch #{name} already exists.")
+ else
+ @branches[name] = @branches[@current].dup
+ @files[name] = @files[@current].dup
+ OperationMessage.new(true, "Created branch #{name}.")
+ end
+ end
+
+ def checkout(name)
+ unless @branches.has_key?(name.to_sym)
+ OperationMessage.new(false, "Branch #{name} does not exist.")
+ else
+ @current = name.to_sym
+ OperationMessage.new(true, "Switched to branch #{name}.")
+ end
+ end
+
+ def remove(name)
+ if not @branches.has_key?(name.to_sym)
+ OperationMessage.new(false, "Branch #{name} does not exist.")
+ elsif name.to_sym == @current
+ OperationMessage.new(false, "Cannot remove current branch.")
+ else
+ @branches.delete(name.to_sym)
+ OperationMessage.new(true, "Removed branch #{name}.")
+ end
+ end
+
+ def list
+ message = ""
+ @branches.keys.sort.each do |name|
+ message << list_prefix(name)
+ message << name.to_s << "\n"
+ end
+ message.chop!
+
+ OperationMessage.new(true, message)
+ end
+
+ def commit(message, stage)
+ stage[:changed].each { |name, object| @files[@current][name] = object }
+ stage[:removed].each { |name, object| @files[@current].delete(name) }
+
+ new_commit = Commit.new(message, stage, @files[@current])
+ @branches[@current] << new_commit
+
+ new_commit
+ end
+
+ def head
+ if @branches[@current].length == 0
+ OperationMessage.new(false, "Branch #{@current}\
+does not have any commits yet.")
+ else
+ last_commit = @branches[@current].last
+ OperationMessage.new(true, last_commit.message, last_commit)
+ end
+ end
+
+ def get_file(name)
+ @files[@current][name.to_sym]
+ end
+
+ def get_commit(hash)
+ @branches[@current].find { |commit| commit.hash == hash }
+ end
+
+ def checkout_commit(last_commit)
+ @files[@current] = last_commit.objects
+ @branches[@current].select! { |c| c.index <= last_commit.index }
+ end
+
+ def log(branch)
+ message = ""
+ @branches[branch].sort_by { |commit| commit.index }.
+ reverse.
+ each { |commit| message << commit.to_s }
+
+ message.strip!
+ end
+
+ private
+ def list_prefix(branch_name)
+ branch_name == :master ? "* " : " "
+ end
+end
+
+class ObjectStore
+ attr_accessor :branch
+
+ class << self
+ def init(&block)
+ self.new &block
+ end
+ end
+
+ def initialize(&block)
+ @branch = Branch.new
+ @stage = {changed: {}, removed: {}}
+
+ if block_given?
+ instance_eval &block
+ end
+ end
+
+ def add(name, object)
+ @stage[:changed][name.to_sym] = object
+ OperationMessage.new(true, "Added #{name} to stage.", object)
+ end
+
+ def commit(message)
+ if @stage[:changed].length == 0 and @stage[:removed].length == 0
+ OperationMessage.new(false, "Nothing to commit, working directory clean.")
+ else
+ new_commit = @branch.commit(message, @stage)
+ changed_files = new_commit.changed.length + new_commit.removed.length
+ message = "#{message}\n\t#{changed_files} objects changed"
+
+ @stage[:changed].clear
+ @stage[:removed].clear
+
+ OperationMessage.new(true, message, new_commit)
+ end
+ end
+
+ def remove(name)
+ object = @branch.get_file(name)
+ unless object
+ OperationMessage.new(false, "Object #{name} is not committed.")
+ else
+ @stage[:removed][name.to_sym] = object
+ OperationMessage.new(true, "Added #{name} for removal.", object)
+ end
+ end
+
+ def checkout(commit_hash)
+ last_commit = @branch.get_commit(commit_hash)
+
+ unless last_commit
+ OperationMessage.new(false, "Commit #{commit_hash} does not exist.")
+ else
+ @branch.checkout_commit(last_commit)
+ OperationMessage.new(true, "HEAD is now at #{commit_hash}.", last_commit)
+ end
+ end
+
+ def log(branch = @branch.current)
+ message = @branch.log(branch)
+
+ unless message and not message.empty?
+ OperationMessage.new(false, "Branch #{branch} \
+does not have any commits yet.")
+ else
+ OperationMessage.new(true, message)
+ end
+ end
+
+ def head
+ @branch.head
+ end
+
+ def get(name)
+ object = @branch.get_file(name)
+ unless object
+ OperationMessage.new(false, "Object #{name} is not committed.")
+ else
+ OperationMessage.new(true, "Found object #{name}.", object)
+ end
+ end
+end