Added some module functions related to DateTime or Time.

[shogi-server/shogi-server.git] / shogi_server / util.rb

diff --git a/shogi_server/util.rb b/shogi_server/util.rb
index b3141e6..cd477af 100644 (file)
--- a/shogi_server/util.rb
+++ b/shogi_server/util.rb
@@ -17,11 +17,15 @@
 ## along with this program; if not, write to the Free Software
 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 
+require 'date'
+require 'fileutils'
+require 'pathname'
+
 module ShogiServer
 
   # Generate a random number such as i<=n<max
   def random(i, max)
-    raise if i >= max
+    return i if i >= max
     return rand(max-i)+i
   end
   module_function :random
@@ -37,4 +41,55 @@ module ShogiServer
   end
   module_function :shuffle
 
+  # See if the file is writable. The file will be created if it does not exist
+  # yet.
+  # Return true if the file is writable, otherwise false.
+  #
+  def is_writable_file?(file)
+    if String === file
+      file = Pathname.new file
+    end
+    if file.exist?
+      if file.file?
+        return file.writable_real?
+      else
+        return false
+      end
+    end
+    
+    begin
+      file.open("w") {|fh| } 
+      file.delete
+    rescue
+      return false
+    end
+
+    return true
+  end
+  module_function :is_writable_file?
+
+  # Convert a DateTime insntace to a Time instance.
+  #
+  def datetime2time(dt)
+    return Time.mktime dt.year, dt.month, dt.day, dt.hour, dt.min, dt.sec
+  end
+  module_function :datetime2time
+
+  # Convert a Time instance to a DateTime instance
+  #
+  def time2datetime(time)
+    return DateTime.new(time.year, time.mon, time.mday,
+                        time.hour, time.min, time.sec)
+  end
+  module_function :time2datetime
+
+  # Parse string representing a day-of-week and return a coresponding
+  # integer value: 1 (Monday) - 7 (Sunday)
+  #
+  def parse_dow(str)
+    index = Date::DAYNAMES.index(str) || Date::ABBR_DAYNAMES.index(str)
+    return nil if index.nil?
+    return index == 0 ? 7 : index
+  end
+  module_function :parse_dow
 end