Add support for options to Daru module (#506)

* Add support for options to Daru module

#476

#502

* Use the max_rows option on the terminal

* fix typo in table formatter

Author: kojix2

lib/daru.rb

@@ -5,6 +5,7 @@ def jruby?
 # :nocov:
 
 module Daru
+
   DAYS_OF_WEEK = {
     'SUN' => 0,
     'MON' => 1,
@@ -102,6 +103,7 @@ def error msg
 require 'daru/index/categorical_index.rb'
 
 require 'daru/helpers/array.rb'
+require 'daru/configuration.rb'
 require 'daru/vector.rb'
 require 'daru/dataframe.rb'
 require 'daru/monkeys.rb'

lib/daru/configuration.rb

@@ -0,0 +1,36 @@
+module Daru
+  # Defines constants and methods related to configuration
+  module Configuration
+
+    INSPECT_OPTIONS_KEYS = [
+      :max_rows,
+
+      # Terminal
+      :spacing,
+    ]
+
+    # Jupyter
+    DEFAULT_MAX_ROWS = 30
+
+    # Terminal
+    DEFAULT_SPACING = 10
+
+    attr_accessor(*INSPECT_OPTIONS_KEYS)
+
+    def configure
+      yield self
+    end
+
+    def self.extended(base)
+      base.reset_options
+    end
+
+    def reset_options
+      self.max_rows  = DEFAULT_MAX_ROWS
+
+      self.spacing   = DEFAULT_SPACING
+    end
+  end
+
+  extend Configuration
+end

lib/daru/dataframe.rb

@@ -12,6 +12,8 @@ class DataFrame # rubocop:disable Metrics/ClassLength
     # TODO: Remove this line but its causing erros due to unkown reason
     Daru.has_nyaplot?
 
+    attr_accessor(*Configuration::INSPECT_OPTIONS_KEYS)
+
     extend Gem::Deprecate
 
     class << self
@@ -2120,7 +2122,7 @@ def to_h
     end
 
     # Convert to html for IRuby.
-    def to_html(threshold=30)
+    def to_html(threshold = Daru.max_rows)
       table_thead = to_html_thead
       table_tbody = to_html_tbody(threshold)
       path = if index.is_a?(MultiIndex)
@@ -2141,7 +2143,8 @@ def to_html_thead
       ERB.new(File.read(table_thead_path).strip).result(binding)
     end
 
-    def to_html_tbody(threshold=30)
+    def to_html_tbody(threshold = Daru.max_rows)
+      threshold ||= @size
       table_tbody_path =
         if index.is_a?(MultiIndex)
           File.expand_path('../iruby/templates/dataframe_mi_tbody.html.erb', __FILE__)
@@ -2258,7 +2261,7 @@ def transpose
     end
 
     # Pretty print in a nice table format for the command line (irb/pry/iruby)
-    def inspect spacing=10, threshold=15
+    def inspect spacing=Daru.spacing, threshold=Daru.max_rows
       name_part = @name ? ": #{@name} " : ''
 
       "#<#{self.class}#{name_part}(#{nrows}x#{ncols})>\n" +

lib/daru/formatters/table.rb

@@ -13,13 +13,10 @@ def initialize(data, headers, row_headers)
         @row_headers = [''] * @data.to_a.size if @row_headers.empty?
       end
 
-      DEFAULT_SPACING = 10
-      DEFAULT_THRESHOLD = 15
-
       def format threshold=nil, spacing=nil
-        rows = build_rows(threshold || DEFAULT_THRESHOLD)
+        rows = build_rows(threshold || Daru.max_rows)
 
-        formatter = construct_formatter rows, spacing || DEFAULT_SPACING
+        formatter = construct_formatter rows, spacing || Daru.spacing
 
         rows.map { |r| formatter % r }.join("\n")
       end