3 ## Copyright (C) 2004 NABEYA Kenichi (aka nanami@2ch)
4 ## Copyright (C) 2007-2012 Daigo Moriwaki (daigo at debian dot org)
6 ## This program is free software; you can redistribute it and/or modify
7 ## it under the terms of the GNU General Public License as published by
8 ## the Free Software Foundation; either version 2 of the License, or
9 ## (at your option) any later version.
11 ## This program is distributed in the hope that it will be useful,
12 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ## GNU General Public License for more details.
16 ## You should have received a copy of the GNU General Public License
17 ## along with this program; if not, write to the Free Software
18 ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
27 # Generate a random number such as i<=n<max
32 module_function :random
35 return if array.size < 2
36 for i in 0...(array.size-1)
37 r = random(i, array.size)
43 module_function :shuffle
54 module_function :factorial
58 numerator = factorial(n)
59 denominator = factorial(k) * factorial(n - k)
60 return numerator / denominator
64 # See if the file is writable. The file will be created if it does not exist
66 # Return true if the file is writable, otherwise false.
68 def is_writable_file?(file)
70 file = Pathname.new file
74 return file.writable_real?
81 file.open("w") {|fh| }
89 module_function :is_writable_file?
91 # Convert a DateTime insntace to a Time instance.
94 return Time.mktime dt.year, dt.month, dt.day, dt.hour, dt.min, dt.sec
96 module_function :datetime2time
98 # Convert a Time instance to a DateTime instance
100 def time2datetime(time)
101 return DateTime.new(time.year, time.mon, time.mday,
102 time.hour, time.min, time.sec)
104 module_function :time2datetime
106 # Parse string representing a day-of-week and return a coresponding
107 # integer value: 1 (Monday) - 7 (Sunday)
110 index = Date::DAYNAMES.index(str) || Date::ABBR_DAYNAMES.index(str)
111 return nil if index.nil?
112 return index == 0 ? 7 : index
114 module_function :parse_dow
116 # Mkdir in a thread-safe way.
121 # Return true if a directory is successfully created or a directory
122 # exists already; false otherwise.
124 # @param path a directory name of a path to be created. For example,
125 # given /hoge/hoo/foo.txt, aim to create /hoge/hoo.
126 def Mkdir.mkdir_for(path)
127 unless FileTest.directory?(File.dirname(path))
128 @@mutex.synchronize do
129 unless FileTest.directory?(File.dirname(path))
131 FileUtils.mkdir_p File.dirname(path)