svn/view/buffer_manager.rb

# buffer_manager.rb: the class definition of Edmaru::BufferManager
#
# Copyright (C) 2007 Takashi Nakamoto
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA.
#

require "buffer.rb"

module Edmaru
  
  #The controller to manage multiple buffers.
  class BufferManager

    #Create the buffer manager.
    #
    #=== Return
    #An initialized manager.
    def initialize
      @buffers = Hash.new
      @files = Hash.new # Buffer names related to specific files.
    end

    #Return the specified buffer.
    #
    #=== Arguments
    #_name_ :: Name of buffer.
    #_type_ :: Buffer type.
    #
    #=== Return
    #The buffer instance whose name is the specified _name_.
    def get(name, type = Buffer)
      if !@buffers.include?(name)
        @buffers[name] = type.new(name)
      elsif @buffers[name].class != type
        #ToDo: What should I do?
      end
        
      return @buffers[name]
    end

    def open_file(filename)
      #If the specified file is already loaded...
      if @files.include?(filename)
        return @buffers[@files[filename]]
      end

      base_buffer_name = File.basename(filename)

      #Append "<n>" behind the buffer name if the buffer name
      #is already used.
      buffer_name = base_buffer_name.clone
      i = 1
      while(@buffers.include?(buffer_name))
        i += 1
        buffer_name = "#{base_buffer_name}<#{i}>"
      end

      begin
        new_buffer = Buffer.new(buffer_name, filename)
        open(filename, "r"){ |f|
          str = f.read
          new_buffer.clear
          new_buffer.append(str)
        }

        @files[filename] = buffer_name
        return @buffers[buffer_name] = new_buffer
      rescue
        return nil
      end
    end
  end
end