make csv export more compatible with Microsoft Excel

lib/order_csv.rb

@@ -1,39 +1,28 @@
 require 'csv'
 
-class OrderCsv
-  include ActionView::Helpers::NumberHelper
+class OrderCsv < RenderCSV
 
-  def initialize(order, options={})
-    @order = order
+  def header
+    [
+      OrderArticle.human_attribute_name(:units_to_order),
+      Article.human_attribute_name(:order_number),
+      Article.human_attribute_name(:name),
+      Article.human_attribute_name(:unit),
+      ArticlePrice.human_attribute_name(:price),
+      OrderArticle.human_attribute_name(:total_price)
+    ]
   end
 
-  def to_csv
-    CSV.generate do |csv|
-      # header
-      csv << [
-               OrderArticle.human_attribute_name(:units_to_order),
-               Article.human_attribute_name(:order_number),
-               Article.human_attribute_name(:name),
-               Article.human_attribute_name(:unit),
-               ArticlePrice.human_attribute_name(:price),
-               OrderArticle.human_attribute_name(:total_price)
-             ]
-      # data
-      @order.order_articles.ordered.includes([:article, :article_price]).all.map do |oa|
-        csv << [
-                 oa.units_to_order,
-                 oa.article.order_number,
-                 oa.article.name,
-                 oa.article.unit + (oa.price.unit_quantity > 1 ? " × #{oa.price.unit_quantity}" : ''),
-                 number_to_currency(oa.article_price.price * oa.article_price.unit_quantity),
-                 number_to_currency(oa.total_price)
-               ]
-      end
+  def data
+    @object.order_articles.ordered.includes([:article, :article_price]).all.map do |oa|
+      yield [
+              oa.units_to_order,
+              oa.article.order_number,
+              oa.article.name,
+              oa.article.unit + (oa.price.unit_quantity > 1 ? " × #{oa.price.unit_quantity}" : ''),
+              number_to_currency(oa.article_price.price * oa.article_price.unit_quantity),
+              number_to_currency(oa.total_price)
+            ]
     end
   end
-
-  # Helper method to test pdf via rails console: OrderCsv.new(order).save_tmp
-  def save_tmp
-    File.open("#{Rails.root}/tmp/#{self.class.to_s.underscore}.csv", 'w') {|f| f.write(to_csv.force_encoding("UTF-8")) }
-  end
 end

lib/render_csv.rb

@@ -0,0 +1,42 @@
+require 'csv'
+
+class RenderCSV
+  include ActionView::Helpers::NumberHelper
+
+  def initialize(object, options={})
+    @object = object
+    @options = options
+    # defaults to please Microsoft Excel ...
+    @options[:col_sep] ||= FoodsoftConfig[:csv_col_sep] || ';'
+    @options[:row_sep] ||= FoodsoftConfig[:csv_row_sep] if FoodsoftConfig[:csv_row_sep]
+    @options[:encoding] ||= FoodsoftConfig[:csv_encoding] || 'ISO-8859-15'
+  end
+
+  def to_csv
+    CSV.generate @options do |csv|
+      if h = header
+        csv << h
+      end
+      data {|d| csv << d}
+    end
+  end
+
+  def header
+    nil
+  end
+
+  def data
+    yield []
+  end
+
+  # Helper method to test pdf via rails console: OrderCsv.new(order).save_tmp
+  def save_tmp
+    encoding = @options[:encoding] || 'UTF-8'
+    File.open("#{Rails.root}/tmp/#{self.class.to_s.underscore}.csv", 'w') {|f| f.write(to_csv.force_encoding(encoding)) }
+  end
+
+  # XXX avoid encoding confusion when using unicode whitespace
+  def number_to_currency(number, options={})
+    super(number, options).gsub("\u202f", ' ')
+  end
+end