Chris@1296: # Redmine - project management software
Chris@1296: # Copyright (C) 2006-2012  Jean-Philippe Lang
Chris@1296: #
Chris@1296: # This program is free software; you can redistribute it and/or
Chris@1296: # modify it under the terms of the GNU General Public License
Chris@1296: # as published by the Free Software Foundation; either version 2
Chris@1296: # of the License, or (at your option) any later version.
Chris@1296: #
Chris@1296: # This program is distributed in the hope that it will be useful,
Chris@1296: # but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@1296: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@1296: # GNU General Public License for more details.
Chris@1296: #
Chris@1296: # You should have received a copy of the GNU General Public License
Chris@1296: # along with this program; if not, write to the Free Software
Chris@1296: # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
Chris@1296: 
Chris@1296: require 'fileutils'
Chris@1296: 
Chris@1296: module Redmine
Chris@1296:   module Thumbnail
Chris@1296:     extend Redmine::Utils::Shell
Chris@1296: 
Chris@1296:     CONVERT_BIN = (Redmine::Configuration['imagemagick_convert_command'] || 'convert').freeze
Chris@1296: 
Chris@1296:     # Generates a thumbnail for the source image to target
Chris@1296:     def self.generate(source, target, size)
Chris@1296:       return nil unless convert_available?
Chris@1296:       unless File.exists?(target)
Chris@1296:         directory = File.dirname(target)
Chris@1296:         unless File.exists?(directory)
Chris@1296:           FileUtils.mkdir_p directory
Chris@1296:         end
Chris@1296:         size_option = "#{size}x#{size}>"
Chris@1296:         cmd = "#{shell_quote CONVERT_BIN} #{shell_quote source} -thumbnail #{shell_quote size_option} #{shell_quote target}"
Chris@1296:         unless system(cmd)
Chris@1296:           logger.error("Creating thumbnail failed (#{$?}):\nCommand: #{cmd}")
Chris@1296:           return nil
Chris@1296:         end
Chris@1296:       end
Chris@1296:       target
Chris@1296:     end
Chris@1296: 
Chris@1296:     def self.convert_available?
Chris@1296:       return @convert_available if defined?(@convert_available)
Chris@1296:       @convert_available = system("#{shell_quote CONVERT_BIN} -version") rescue false
Chris@1296:       logger.warn("Imagemagick's convert binary (#{CONVERT_BIN}) not available") unless @convert_available
Chris@1296:       @convert_available
Chris@1296:     end
Chris@1296: 
Chris@1296:     def self.logger
Chris@1296:       Rails.logger
Chris@1296:     end
Chris@1296:   end
Chris@1296: end