Rework the IO wrapper stack (#59)

* Remove rubyzip adapter and test
* Remove IO wrappers
* Rework the IO wrapper stack

The IO wrappers were not really needed except in tests. Also, some work needed to be done to allow the gem to use the ZipKit streaming helper, as there were questions about how to stream from Rails.

CHANGELOG.md

@@ -1,8 +1,12 @@
 # Changelog
 
-## 2.5.0 (2020-06-27)
+## 3.0.0 (unreleased)
 
 - Change dependency from zip_tricks to zip_kit
+- Allow ZipKit streamer to be passed in as output destination. In that case the Streamer can be closed externally
+- Remove IO wrappers and leave just the ZIP output wrapper, as it is the only one which would produce useable output
+- Ensure the gem can use the ZipKit Rails streaming helper for output
+- Switch from Travis-CI to Github Actions
 
 ## 2.4.0 (2020-06-27)
 

README.md

@@ -1,7 +1,6 @@
 # Xlsxtream
 
 [![Gem Version](https://badge.fury.io/rb/xlsxtream.svg)](https://rubygems.org/gems/xlsxtream)
-[![Build Status](https://travis-ci.org/felixbuenemann/xlsxtream.svg)](https://travis-ci.org/felixbuenemann/xlsxtream)
 
 Xlsxtream is a streaming writer for XLSX spreadsheets. It supports multiple worksheets and optional string
 deduplication via a shared string table (SST). Its purpose is to replace CSV for large exports, because using
@@ -33,7 +32,7 @@ Or install it yourself as:
 ## Usage
 
 ```ruby
-# Creates a new workbook and closes it at the end of the block
+# Creates a new workbook file, write and close it at the end of the block
 Xlsxtream::Workbook.open('my_data.xlsx') do |xlsx|
   xlsx.write_worksheet 'Sheet1' do |sheet|
     # Boolean, Date, Time, DateTime and Numeric are properly mapped
@@ -108,35 +107,39 @@ Xlsxtream::Workbook.new(io, columns: [
 ])
 # The :columns option can also be given to write_worksheet, so it's
 # possible to have multiple worksheets with different column widths.
-```
 
 
+# Output from Rails (will stream without buffering)
+class ReportsController < ApplicationController
+  include ZipKit::RailsStreaming
+  EXCEL_CONTENT_TYPE = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
+
+  def download
+    zip_kit_stream(filename: "report.xlsx", type: EXCEL_CONTENT_TYPE) do |zip_kit_streamer|
+      Xlsxtream::Workbook.open(zip_kit_streamer) do |xlsx|
+        xlsx.write_worksheet 'Sheet1' do |sheet|
+          # Boolean, Date, Time, DateTime and Numeric are properly mapped
+          sheet << [true, Date.today, 'hello', 'world', 42, 3.14159265359, 42**13]
+        end
+      end
+    end
+  end
+end
+```
+
 ## Compatibility
 
-The current version of Xlsxtream requires at least Ruby 2.1.0.
+The current version of Xlsxtream requires at least Ruby 2.6
 
 If you are using an older Ruby version you can use the following in your Gemfile:
 
 ```ruby
-gem 'xlsxtream', '< 2'
+gem 'xlsxtream', '< 3'
 ```
 
 * The last version with support for Ruby 1.9.1 is 1.2.0.
 * The last version with support for Ruby 1.9.2 is 1.3.2.
-
-## Upgrading
-
-If you are upgrading from a version earlier than 2.x and are using the undocumented `:io_wrapper` option you need to update your code:
-
-```ruby
-# Pre 2.x code with :io_wrapper option
-Xlsxtream::Workbook.new(io, io_wrapper: MyCustomIOWrapper)
-# New code with IO wrapper instance
-io_wrapper = MyCustomIOWrapper.new(io)
-Xlsxtream::Workbook.new(io_wrapper)
-```
-
-Every IO-like object that responds to `:add_file` is treated as an IO wrapper.
+* The last version with support for Ruby 2.1.x is 2.4.x
 
 ## Development
 

lib/xlsxtream/version.rb

@@ -1,4 +1,4 @@
 # frozen_string_literal: true
 module Xlsxtream
-  VERSION = '2.4.0'.freeze
+  VERSION = '3.0.0'
 end