Separate the Preprocess module into new files

lib/preprocess.rb

@@ -0,0 +1,65 @@
+module Uplot
+  module Preprocess
+    module_function
+
+    def input(input, delimiter, headers, transpose)
+      arr = read_csv(input, delimiter)
+      headers = get_headers(arr, headers, transpose)
+      series = get_series(arr, headers, transpose)
+      Data.new(headers, series)
+    end
+
+    def read_csv(input, delimiter)
+      CSV.parse(input, col_sep: delimiter)
+         .delete_if do |i|
+           i == [] or i.all? nil
+         end
+    end
+
+    # Transpose different sized ruby arrays
+    # https://stackoverflow.com/q/26016632
+    def transpose2(arr)
+      Array.new(arr.map(&:length).max) { |i| arr.map { |e| e[i] } }
+    end
+
+    def get_headers(arr, headers, transpose)
+      if headers
+        if transpose
+          arr.map(&:first)
+        else
+          arr[0]
+        end
+      end
+    end
+
+    def get_series(arr, headers, transpose)
+      if transpose
+        if headers
+          arr.map { |row| row[1..-1] }
+        else
+          arr
+        end
+      else
+        if headers
+          transpose2(arr[1..-1])
+        else
+          transpose2(arr)
+        end
+      end
+    end
+
+    def count(arr)
+      # tally was added in Ruby 2.7
+      if Enumerable.method_defined? :tally
+        arr.tally
+      else
+        # https://github.com/marcandre/backports
+        arr.each_with_object(Hash.new(0)) { |item, res| res[item] += 1 }
+           .tap { |h| h.default = nil }
+      end
+        .sort { |a, b| a[1] <=> b[1] }
+        .reverse
+        .transpose
+    end
+  end
+end

lib/uplot.rb

@@ -1,5 +1,6 @@
 require 'unicode_plot'
 require 'uplot/version'
+require 'uplot/preprocess'
 require 'uplot/command.rb'
 
 module Uplot

lib/uplot/command.rb

@@ -5,70 +5,6 @@ require 'unicode_plot'
 module Uplot
   Data = Struct.new(:headers, :series)
 
-  module Preprocess
-    module_function
-
-    def input(input, delimiter, headers, transpose)
-      arr = read_csv(input, delimiter)
-      headers = get_headers(arr, headers, transpose)
-      series = get_series(arr, headers, transpose)
-      Data.new(headers, series)
-    end
-
-    def read_csv(input, delimiter)
-      CSV.parse(input, col_sep: delimiter)
-         .delete_if do |i|
-           i == [] or i.all? nil
-         end
-    end
-
-    # Transpose different sized ruby arrays
-    # https://stackoverflow.com/q/26016632
-    def transpose2(arr)
-      Array.new(arr.map(&:length).max) { |i| arr.map { |e| e[i] } }
-    end
-
-    def get_headers(arr, headers, transpose)
-      if headers
-        if transpose
-          arr.map(&:first)
-        else
-          arr[0]
-        end
-      end
-    end
-
-    def get_series(arr, headers, transpose)
-      if transpose
-        if headers
-          arr.map { |row| row[1..-1] }
-        else
-          arr
-        end
-      else
-        if headers
-          transpose2(arr[1..-1])
-        else
-          transpose2(arr)
-        end
-      end
-    end
-
-    def count(arr)
-      # tally was added in Ruby 2.7
-      if Enumerable.method_defined? :tally
-        arr.tally
-      else
-        # https://github.com/marcandre/backports
-        arr.each_with_object(Hash.new(0)) { |item, res| res[item] += 1 }
-           .tap { |h| h.default = nil }
-      end
-        .sort { |a, b| a[1] <=> b[1] }
-        .reverse
-        .transpose
-    end
-  end
-
   class Command
     Params = Struct.new(
       # Sort me!