ls -l

ls.rb

@@ -1,8 +1,10 @@
 # frozen_string_literal: true
 
 require 'optparse'
+require 'etc'
 
 COLUMNS = 3
+SIZE_INDENT = 3
 
 def run
   listed_filenames = list_filenames
@@ -14,8 +16,8 @@ end
 def list_filenames
   params = ARGV.getopts('a', 'r', 'l')
   flags = params['a'] ? File::FNM_DOTMATCH : 0
-  params['l'] ? option_l : 0
   filenames = Dir.glob('*', flags)
+  params['l'] ? ownerinfo(filenames) : filenames
   if params['r']
     filenames.reverse
   else
@@ -23,9 +25,31 @@ def list_filenames
   end
 end
 
-def permission
-  list_filenames.each do |index|
-    file_stat = File::Stat.new
+def ownerinfo(filenames)
+  filenames.each do |file|
+    file_stat = File::Stat.new(file)
+    file_type(file_stat)
+    permission(file_stat)
+    print " #{file_stat.nlink}"
+    print " #{Etc.getpwuid(file_stat.uid).name}"
+    print " #{Etc.getgrgid(file_stat.gid).name}"
+    print " #{file_stat.size}".rjust(file_size(filenames))
+    timestamp(file_stat)
+    symbolic(file)
+    puts
+  end
+end
+
+def symbolic(file)
+  if File.lstat(file).symlink?
+    print " #{file} -> #{File.readlink(file)}"
+  else
+    print " #{file}"
+  end
+end
+
+def permission(file_stat)
+  (-3..-1).each do |index|
     case file_stat.mode.to_s(8)[index]
     when '0' then print '---'
     when '1' then print '--x'
@@ -39,6 +63,35 @@ def permission
   end
 end
 
+def file_type(file_stat)
+  case file_stat.ftype
+  when 'file'
+    print '-'
+  when 'directory'
+    print 'd'
+  when 'characterSpecial'
+    print 'c'
+  when 'fifo'
+    print 'p'
+  when 'link'
+    print 'l'
+  when 'socket'
+    print 's'
+  end
+end
+
+def file_size(filenames)
+  filenames.map { |file| File.size(file) }.max.to_s.length + SIZE_INDENT
+end
+
+def timestamp(file_stat)
+  if Time.now - file_stat.mtime >= (60 * 60 * 24 * (365 / 2.0)) || (Time.now - file_stat.mtime).negative?
+    print "  #{file_stat.mtime.strftime('%_m %_d  %Y')}"
+  else
+    print "  #{file_stat.mtime.strftime('%_m %_d %H:%M')}"
+  end
+end
+
 def slice_filenames(listed_filenames)
   columns_size = listed_filenames.size.ceildiv(COLUMNS)
   listed_filenames.each_slice(columns_size).to_a