# ------------------------------------------------------------
# Date struct for proper date handling
# ------------------------------------------------------------
class DateStruct
attr_accessor :year, :month, :day
def initialize(year, month, day)
@year = year
@month = month
@day = day
end
end
# ------------------------------------------------------------
# Print a date in YYYY-MM-DD format
# ------------------------------------------------------------
def format_date(d)
"%04d-%02d-%02d" % [d.year, d.month, d.day]
end
# ------------------------------------------------------------
# File entry struct
# ------------------------------------------------------------
class FileEntry
attr_accessor :name, :extension, :date, :size
def initialize(name, extension, date, size)
@name = name # File name without extension
@extension = extension # Extension including dot
@date = date # Real date struct
@size = size # Bytes
end
end
# ------------------------------------------------------------
# Sort by name (lexicographically)
# ------------------------------------------------------------
def sort_by_name(files)
files.sort_by { |f| f.name }
end
# ------------------------------------------------------------
# Sort by extension (lexicographically)
# ------------------------------------------------------------
def sort_by_extension(files)
files.sort_by { |f| f.extension }
end
# ------------------------------------------------------------
# Sort by date (year → month → day)
# ------------------------------------------------------------
def sort_by_date(files)
files.sort_by { |f| [f.date.year, f.date.month, f.date.day] }
end
# ------------------------------------------------------------
# Sort by size (ascending)
# ------------------------------------------------------------
def sort_by_size(files)
files.sort_by { |f| f.size }
end
# ------------------------------------------------------------
# Print file list
# ------------------------------------------------------------
def print_files(files)
files.each do |f|
puts "#{f.name}#{f.extension} #{format_date(f.date)} #{f.size} bytes"
end
puts
end
# ------------------------------------------------------------
# Main program
# ------------------------------------------------------------
files = [
FileEntry.new("G1zTo5jJk", ".jpg", DateStruct.new(2007,7,8), 51954),
FileEntry.new("LTEE4SI0j", ".jpg", DateStruct.new(2011,11,13), 43442),
FileEntry.new("PDqmuO3GH", ".cpp", DateStruct.new(2004,5,21), 3346),
FileEntry.new("qJO2qjukZ", ".png", DateStruct.new(2010,8,27), 67087),
FileEntry.new("HqclTqxb4", ".cpp", DateStruct.new(2020,9,5), 70531),
FileEntry.new("imVyTyoaF", ".jpg", DateStruct.new(2011,3,19), 43846),
FileEntry.new("rXwXdy8XO", ".txt", DateStruct.new(2017,10,12), 70193),
FileEntry.new("9Z4fbOBUc", ".pdf", DateStruct.new(2004,6,9), 1754),
FileEntry.new("ZHahuu4vS", ".txt", DateStruct.new(2003,10,10), 65126),
FileEntry.new("0SnZHh2GT", ".png", DateStruct.new(2006,10,18), 25890)
]
puts "Original:"
print_files(files)
puts "Sorted by name:"
print_files(sort_by_name(files))
puts "Sorted by extension:"
print_files(sort_by_extension(files))
puts "Sorted by date:"
print_files(sort_by_date(files))
puts "Sorted by size:"
print_files(sort_by_size(files))
=begin
Run:
Original:
G1zTo5jJk.jpg 2007-07-08 51954 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
Sorted by name:
0SnZHh2GT.png 2006-10-18 25890 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
Sorted by extension:
PDqmuO3GH.cpp 2004-05-21 3346 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
Sorted by date:
ZHahuu4vS.txt 2003-10-10 65126 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
Sorted by size:
9Z4fbOBUc.pdf 2004-06-09 1754 bytes
PDqmuO3GH.cpp 2004-05-21 3346 bytes
0SnZHh2GT.png 2006-10-18 25890 bytes
LTEE4SI0j.jpg 2011-11-13 43442 bytes
imVyTyoaF.jpg 2011-03-19 43846 bytes
G1zTo5jJk.jpg 2007-07-08 51954 bytes
ZHahuu4vS.txt 2003-10-10 65126 bytes
qJO2qjukZ.png 2010-08-27 67087 bytes
rXwXdy8XO.txt 2017-10-12 70193 bytes
HqclTqxb4.cpp 2020-09-05 70531 bytes
=end
