diff --git a/colorls.rb b/colorls.rb
index 454869b..533b944 100755
--- a/colorls.rb
+++ b/colorls.rb
@@ -7,7 +7,7 @@ require 'terminfo'
 
 # Source for icons unicode: http://nerdfonts.com/
 class ColorLS # rubocop:disable ClassLength
-  def initialize(input, report:, sort:, show:, one_per_line:)
+  def initialize(input = nil, report:, sort:, show:, one_per_line:)
     @input        = input || Dir.pwd
     @count        = { folders: 0, recognized_files: 0, unrecognized_files: 0 }
     @report       = report
@@ -17,62 +17,13 @@ class ColorLS # rubocop:disable ClassLength
     @screen_width = TermInfo.screen_size.last
 
     init_contents
-
     @max_widths = @contents.map(&:length)
-
     init_icons
   end
 
-  def init_contents
-    unless Dir.exist?(@input)
-      raise ArgumentError, "Specified directory doesn't exist: " + @input
-    end
-
-    @contents = Dir.entries(@input) - ['.', '..']
-
-    filter_contents
-    sort_contents
-  end
-
-  def filter_contents
-    return unless @show
-
-    @contents.keep_if do |x|
-      if @show == 'dirs'
-        Dir.exist?("#{@input}/#{x}")
-      else
-        !Dir.exist?("#{@input}/#{x}")
-      end
-    end
-  end
-
-  def sort_contents
-    return unless @sort
-
-    @contents.sort! do |a, b|
-      cmp_by_dirs(a, b)
-    end
-  end
-
-  def cmp_by_dirs(a, b)
-    is_a_dir = Dir.exist?("#{@input}/#{a}")
-    is_b_dir = Dir.exist?("#{@input}/#{b}")
-
-    if is_a_dir ^ is_b_dir
-      result = is_a_dir ? -1 : 1
-      result *= -1 if @sort == 'files'
-      result
-    else
-      cmp_by_alpha(a, b)
-    end
-  end
-
-  def cmp_by_alpha(a, b)
-    a.downcase <=> b.downcase
-  end
-
   def ls
     @contents = chunkify
+    @max_widths = @contents.transpose.map { |c| c.map(&:length).max }
     @contents.each { |chunk| ls_line(chunk) }
     print "\n"
     display_report if @report
@@ -82,6 +33,41 @@ class ColorLS # rubocop:disable ClassLength
 
   private
 
+  def init_contents
+    @contents = Dir.entries(@input) - ['.', '..']
+
+    filter_contents if @show
+    sort_contents   if @sort
+
+    @total_content_length = @contents.length
+  end
+
+  def filter_contents
+    @contents.keep_if do |x|
+      next Dir.exist?("#{@input}/#{x}") if @show == :dirs
+      !Dir.exist?("#{@input}/#{x}")
+    end
+  end
+
+  def sort_contents
+    @contents.sort! { |a, b| cmp_by_dirs(a, b) }
+  end
+
+  def cmp_by_dirs(a, b)
+    is_a_dir = Dir.exist?("#{@input}/#{a}")
+    is_b_dir = Dir.exist?("#{@input}/#{b}")
+
+    return cmp_by_alpha(a, b) unless is_a_dir ^ is_b_dir
+
+    result = is_a_dir ? -1 : 1
+    result *= -1 if @sort == :files
+    result
+  end
+
+  def cmp_by_alpha(a, b)
+    a.downcase <=> b.downcase
+  end
+
   def init_icons
     @files          = load_from_yaml('files.yaml')
     @file_aliases   = load_from_yaml('file_aliases.yaml', true)
@@ -98,10 +84,7 @@ class ColorLS # rubocop:disable ClassLength
   end
 
   def chunkify
-    if @one_per_line
-      @max_widths = [@max_widths.max]
-      return @contents.zip
-    end
+    return @contents.zip if @one_per_line
 
     chunk_size = @contents.count
 
@@ -126,7 +109,7 @@ class ColorLS # rubocop:disable ClassLength
   end
 
   def display_report
-    print "\n   Found #{@contents.flatten.length} contents in directory "
+    print "\n   Found #{@total_content_length} contents in directory "
       .colorize(:white)
 
     print File.expand_path(@input).to_s.colorize(:blue)
@@ -185,52 +168,52 @@ class ColorLS # rubocop:disable ClassLength
 end
 
 args             = *ARGV
-report           = args.include?('--report') || args.include?('-r')
-one_per_line     = args.include?('-1')
-sort_files_first = args.include?('-sf') || args.include?('--sort-files')
+opts             = {}
+
+opts[:report]       = args.include?('-r') || args.include?('--report')
+opts[:one_per_line] = args.include?('-1')
+
+show_dirs_only   = args.include?('-d')  || args.include?('--dirs')
+show_files_only  = args.include?('-f')  || args.include?('--files')
 sort_dirs_first  = args.include?('-sd') || args.include?('--sort-dirs')
-show_files_only  = args.include?('-f') || args.include?('--files')
-show_dirs_only   = args.include?('-d') || args.include?('--dirs')
+sort_files_first = args.include?('-sf') || args.include?('--sort-files')
 
 if sort_dirs_first && sort_files_first
-  raise ArgumentError, 'Restrain from using -sd and -sf flags together'
+  STDERR.puts "\n  Restrain from using -sd and -sf flags together."
+    .colorize(:red)
+  return
 end
 
 if show_files_only && show_dirs_only
-  raise ArgumentError, 'Restrain from using -d and -f flags together'
+  STDERR.puts "\n  Restrain from using -d and -f flags together."
+    .colorize(:red)
+  return
 end
 
-sort = if sort_files_first
-         'files'
-       elsif sort_dirs_first
-         'dirs'
-       else
-         false
-       end
+opts[:sort] = if sort_files_first
+                :files
+              elsif sort_dirs_first
+                :dirs
+              end
 
-show = if show_files_only
-         'files'
-       elsif show_dirs_only
-         'dirs'
-       else
-         false
-       end
+opts[:show] = if show_files_only
+                :files
+              elsif show_dirs_only
+                :dirs
+              end
 
 args.keep_if { |arg| !arg.start_with?('-') }
 
 if args.empty?
-  ColorLS.new(nil,
-              report:       report,
-              sort:         sort,
-              show:         show,
-              one_per_line: one_per_line).ls
+  ColorLS.new(opts).ls
 else
   args.each do |path|
-    ColorLS.new(path,
-                report:       report,
-                sort:         sort,
-                show:         show,
-                one_per_line: one_per_line).ls
+    if Dir.exist?(path)
+      ColorLS.new(path, opts).ls
+    else
+      next STDERR.puts "\n  Specified directory '#{path}' doesn't exist."
+        .colorize(:red)
+    end
   end
 end