[WIP] Rewrite plugin

.gitignore

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 *~
-*.iml
-.idea
-build/
-/classpath/
-/.gradle
 /pkg/
-*.gemspec
+/tmp/
+/.bundle/
+/Gemfile.lock

.ruby-version

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+jruby-9.1.13.0

Gemfile

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+source 'https://rubygems.org/'
+gemspec

README.md

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-# Google Spreadsheets output plugin for Embulk [![Build Status](https://travis-ci.org/kataring/embulk-output-google_spreadsheets.svg?branch=master)](https://travis-ci.org/kataring/embulk-output-google_spreadsheets) [![Gem Version](https://badge.fury.io/rb/embulk-output-google_spreadsheets.svg)](http://badge.fury.io/rb/embulk-output-google_spreadsheets)
-
-Embulk output plugin to load into Google Spreadsheets.
+# Google Spreadsheets output plugin for Embulk
 
 ## Overview
 
 * **Plugin type**: output
 * **Load all or nothing**: no
 * **Resume supported**: no
-* **Cleanup supported**: yes
+* **Cleanup supported**: no
 
-## Usage
+## Configuration
 
-### Install plugin
+- auth_method (string, default: 'authorized_user'): 'authorized_user' or 'service_account'
+- json_keyfile (string, required): credential file path or `content` string
+- spreadsheets_url (string, required): your spreadsheet's url
+- worksheet_title (string, required): worksheet's title
+- mode (string, default: append): writing record method, available mode are `append` and `replace`
+- header_line (bool, default: false): if true, write header to first record
+- start_row (integer, default: 1): specific the start row
+- start_column (integer, default: 1): specific the start column
+- null_string (string, default: ''): replace null to `null_string`
+- default_timezone (string, default: '+00:00'): time zone offset of timestamp columns
+- default_timestamp_format (string, default: '%Y-%m-%d %H:%M:%S.%6N %z'): output format of timestamp columns
 
-```
-embulk gem install embulk-output-google_spreadsheets
-```
+**json_keyfile**
 
+specific the credential file which the Google Developer Console provides for authorization.
+https://console.developers.google.com/apis/credentials
+if use oauth, should be included the `refresh_token` field in credential json file.
 
-## Configuration
-
-- **service_account_email**: Your Google service account email (string, required)
-- **p12_keyfile**: Fullpath of private key in P12(PKCS12) format (string, required)
-- **spreadsheet_id**: Your spreadsheet id (string, required)
-- **sheet_index**: sheet index (int, optional default: 0)
-- **application_name**: Anything you like (string, optional defaulf: "Embulk-GoogleSpreadsheets-OutputPlugin")
+```
+{
+  "client_id": "******************************************************",
+  "client_secret": "***************************",
+  "refresh_token": "***************************"
+}
+```
 
 ## Example
 
-```yaml
+```
 out:
   type: google_spreadsheets
-  service_account_email: 'XXXXXXXXXXXXXXXXXXXXXXXX@developer.gserviceaccount.com'
-  p12_keyfile: '/tmp/embulk.p12'
-  spreadsheet_id: '1RPXaB85DXM7sGlpFYIcpoD2GWFpktgh0jBHlF4m1a0A'
+  json_keyfile:
+    content: |
+      {
+        "client_id": "******************************************************",
+        "client_secret": "***************************",
+        "refresh_token": "***************************"
+      }
+  # json_keyfile: './keyfile.json'
+  spreadsheets_url: 'https://docs.google.com/spreadsheets/d/16RSM_xj5ZB4rz0WBlnIbD1KHO46KASnAY04e_oYUSEE/edit'
+  worksheet_title: 'シート1'
+  start_row: 1
+  start_column: 1
+  header_line: true
+  null_string : '(NULL)'
+  default_timezone: '+09:00'
+  default_timestamp_format: "%Y-%m-%d %H:%M:%S %z"
 ```
 
 
 ## Build
 
 ```
-$ ./gradlew gem
+$ rake
 ```

Rakefile

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+require "bundler/gem_tasks"
+
+task default: :build

embulk-output-google_spreadsheets.gemspec

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+Gem::Specification.new do |spec|
+  spec.name          = "embulk-output-google_spreadsheets"
+  spec.version       = "0.1.0"
+  spec.authors       = ["potato2003"]
+  spec.summary       = "Google Spreadsheets output plugin for Embulk"
+  spec.description   = "Dumps records to Google Spreadsheets."
+  spec.email         = ["potato2003@gmail.com"]
+  spec.licenses      = ["MIT"]
+  # TODO set this: spec.homepage      = "https://github.com/ryuji.ito/embulk-output-google_spreadsheets"
+
+  spec.files         = `git ls-files`.split("\n") + Dir["classpath/*.jar"]
+  spec.test_files    = spec.files.grep(%r{^(test|spec)/})
+  spec.require_paths = ["lib"]
+
+  #spec.add_dependency 'YOUR_GEM_DEPENDENCY', ['~> YOUR_GEM_DEPENDENCY_VERSION']
+  spec.add_development_dependency 'embulk', ['>= 0.8.35']
+  spec.add_development_dependency 'bundler', ['>= 1.10.6']
+  spec.add_development_dependency 'rake', ['>= 10.0']
+  spec.add_dependency 'google-api-client'
+end