Displays thumbnails of attached images of the issue view (#1006).

This behaviour can be turned on/off in Settings -> Display (off by default). Thumbnail size can be configured there too.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9933 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/thumbnail.rb

@@ -0,0 +1,46 @@
+# Redmine - project management software
+# Copyright (C) 2006-2012  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# 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 'fileutils'
+
+module Redmine
+  module Thumbnail
+    extend Redmine::Utils::Shell
+
+    # Generates a thumbnail for the source image to target
+    def self.generate(source, target, size)
+      unless File.exists?(target)
+        directory = File.dirname(target)
+        unless File.exists?(directory)
+          FileUtils.mkdir_p directory
+        end
+        bin = Redmine::Configuration['imagemagick_convert_command'] || 'convert'
+        size_option = "#{size}x#{size}>"
+        cmd = "#{shell_quote bin} #{shell_quote source} -thumbnail #{shell_quote size_option} #{shell_quote target}"
+        unless system(cmd)
+          logger.error("Creating thumbnail failed (#{$?}):\nCommand: #{cmd}")
+          return nil
+        end
+      end
+      target
+    end
+
+    def self.logger
+      Rails.logger
+    end
+  end
+end

lib/redmine/utils.rb

@@ -41,5 +41,15 @@ module Redmine
         SecureRandom.hex(n)
       end
     end
+
+    module Shell
+      def shell_quote(str)
+        if Redmine::Platform.mswin?
+          '"' + str.gsub(/"/, '\\"') + '"'
+        else
+          "'" + str.gsub(/'/, "'\"'\"'") + "'"
+        end
+      end
+    end
   end
 end