Димитър обнови решението на 19.11.2015 11:01 (преди над 8 години)
+require 'digest/sha1'
+require "date"
+class ObjectStore
+ def initialize
+ @branches = Branches.new
+ @state = {}
+ end
+
+ def self.init(&init_block)
+ repository = ObjectStore.new
+ repository.instance_eval &init_block if block_given?
+ repository
+ end
+
+ def add(name, object)
+ @state[name] = object
+ Result.new "Added #{name} to stage.", true, object
+ end
+
+ def remove(name)
+ object = @state.delete name
+ if object
+ Result.new "Added #{name} for removal", true, object
+ else
+ Result.new "Object #{name} is not committed.", false
+ end
+ end
+
+ def commit(commit_message)
+ if @state == branch.current_branch.state
+ Result.new "Nothing to commit, working directory clean.", false
+ else
+ branch.current_branch.commit_state @state, commit_message
+ end
+ end
+
+ def checkout(commit_hash)
+ commit = branch.current_branch.checkout(commit_hash)
+ if commit
+ Result.new "HEAD is now at #{commit_hash}.", true, commit
+ else
+ Result.new "Commit #{commit_hash} does not exist.", false
+ end
+ end
+
+ def head
+ head = branch.current_branch.last_commit
+ if head
+ Result.new head.message, true, head
+ else
+ branch_name = branch.current_branch_name
+ Result.new "Branch #{branch_name} does not have any commits yet.", false
+ end
+ end
+
+ def get(name)
+ object = branch.current_branch.state[name]
+ if object
+ Result.new "Found object #{name}.", true, object
+ else
+ Result.new "Object #{name} is not committed.", false
+ end
+ end
+
+ def branch
+ @branches
+ end
+
+ def log
+ if @branches.current_branch.commits_string
+ Result.new @branches.current_branch.commits_string, true
+ else
+ branch_name = @branches.current_branch_name
+ Result.new "Branch #{branch_name} does not have any commits yet.", false
+ end
+ end
+
+ class Branches
+ attr_reader :current_branch
+ def initialize()
+ @branches = {}
+ create "master"
+ @current_branch = @branches["master"]
+ end
+
+ def create(branch_name)
+ if @branches[branch_name]
+ Result.new "Branch #{branch_name} already exists.", false
+ else
+ @branches[branch_name] = Branch.new @current_branch
+ Result.new "Created branch #{branch_name}.", true
+ end
+ end
+
+ def checkout(branch_name)
+ if @branches[branch_name]
+ @current_branch = @branches[branch_name]
+ Result.new "Switched to branch #{branch_name}.", true
+ else
+ Result.new "Branch #{branch_name} does not exist.", false
+ end
+ end
+
+ def remove(branch_name)
+ if @branches[branch_name]
+ if @current_branch == @branches[branch_name]
+ Result.new "Cannot remove current branch.", false
+ else
+ @branches.delete(branch_name)
+ Result.new "Removed branch #{branch_name}.", true
+ end
+ else
+ Result.new "Branch #{branch_name} does not exist.", false
+ end
+ end
+
+ def list
+ branch_list = @branches.keys.sort.map do |name|
+ (@branches[name] == @current_branch ? "* " : " ") + name
+ end.join("\n")
+ Result.new branch_list, true
+ end
+
+ def current_branch_name
+ @branches.key @current_branch
+ end
+
+ class Branch
+ attr_reader :state, :commits
+ def initialize(parent = nil)
+ @commits, @state = parent ? [parent.commits, parent.state] : [[], {}]
+ end
+
+ def commit_state(state, message)
+ intersection = (@state.to_a | state.to_a) - (@state.to_a & state.to_a)
+ count = intersection.to_h.size
+ @state = state.dup
+ @commits.push(Commit.new state, message)
+ Result.new "#{message}\n\t#{count} objects changed", true, last_commit
+ end
+
+ def last_commit
+ @commits.last
+ end
+
+ def commits_string
+ @commits.empty? ? nil : @commits.reverse.join("\n\n")
+ end
+
+ def checkout(hash)
+ commit_index = @commits.index{|commit| commit.hash == hash}
+ commit_index ? (@commits = commits[0..commit_index]).last : nil
+ end
+
+ class Commit
+ attr_reader :hash, :commit_message
+ def initialize(state, message)
+ @state = state
+ @commit_message = message
+ @date = Time.now
+ @hash = Digest::SHA1.hexdigest "#{@date}#{@message}"
+ end
+
+ def date
+ @date
+ end
+
+ def message
+ @commit_message
+ end
+
+ def hash
+ @hash
+ end
+
+ def objects
+ @state.values
+ end
+
+ def to_s
+ format = "%a %b %d %H:%M %Y %z"
+ "Commit #{@hash}\nDate: #{@date.strftime format}\n\n\t#{@message}"
+ end
+ end
+ end
+ end
+
+ class Result
+ def initialize(message, successful, result = nil)
+ @message = message
+ @successful = successful
+ @result = result
+ end
+
+ def success?
+ @successful
+ end
+
+ def error?
+ ! @successful
+ end
+
+ def result
+ @result
+ end
+
+ def message
+ @message
+ end
+
+ def to_s
+ message
+ end
+ end
+end