From d9777435a48ef0e0bff0bf28d8ea7ef962042d11 Mon Sep 17 00:00:00 2001
From: kojix2 <2xijok@gmail.com>
Date: Thu, 3 Jun 2021 10:38:09 +0900
Subject: [PATCH 1/2] Add Test on ruby 2.4

---
 .github/workflows/ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9c563a2..450bfd7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -7,7 +7,7 @@ jobs:
     strategy:
       matrix:
         os:   ['ubuntu', 'macos']
-        ruby: [ '2.6', '2.7', '3.0' ]
+        ruby: [ '2.4', '2.5', '2.6', '2.7', '3.0' ]
     steps:
       - uses: actions/checkout@v2
       - uses: ruby/setup-ruby@v1

From f823377c50a3558be157fabc57a2f0c8596e9de4 Mon Sep 17 00:00:00 2001
From: kojix2 <2xijok@gmail.com>
Date: Thu, 3 Jun 2021 10:48:47 +0900
Subject: [PATCH 2/2] Make tests pass in Ruby 2.4

---
 lib/youplot/backends/processing.rb |  2 +-
 lib/youplot/dsv.rb                 |  2 +-
 lib/youplot/options.rb             |  4 ++--
 lib/youplot/parser.rb              | 20 ++++++++++----------
 4 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/lib/youplot/backends/processing.rb b/lib/youplot/backends/processing.rb
index ab373a9..6925b4e 100644
--- a/lib/youplot/backends/processing.rb
+++ b/lib/youplot/backends/processing.rb
@@ -18,7 +18,7 @@ module YouPlot
             # compare values
             r = b[1] <=> a[1]
             # If the values are the same, compare by name
-            r = a[0] <=> b[0] if r == 0
+            r = a[0] <=> b[0] if r.zero?
             r
           end
           .transpose
diff --git a/lib/youplot/dsv.rb b/lib/youplot/dsv.rb
index b1d48fc..8dbd8f2 100644
--- a/lib/youplot/dsv.rb
+++ b/lib/youplot/dsv.rb
@@ -14,7 +14,7 @@ module YouPlot
 
       # Remove blank lines
       arr.delete_if do |i|
-        i == [] or i.all? nil
+        i == [] or i.all?(&:nil?)
       end
 
       # get header
diff --git a/lib/youplot/options.rb b/lib/youplot/options.rb
index 1fb2a3d..2a9fd3b 100644
--- a/lib/youplot/options.rb
+++ b/lib/youplot/options.rb
@@ -12,7 +12,7 @@ module YouPlot
     :progressive,
     :encoding,
     :color_names,
-    :debug,
-    keyword_init: true
+    :debug
+    # keyword_init: true
   )
 end
diff --git a/lib/youplot/parser.rb b/lib/youplot/parser.rb
index 5d8323d..8c7aec5 100644
--- a/lib/youplot/parser.rb
+++ b/lib/youplot/parser.rb
@@ -15,16 +15,16 @@ module YouPlot
       @command = nil
 
       @options = Options.new(
-        delimiter: "\t",
-        transpose: false,
-        headers: nil,
-        pass: false,
-        output: $stderr,
-        fmt: 'xyy',
-        progressive: false,
-        encoding: nil,
-        color_names: false,
-        debug: false
+        "\t",    # elimiter:
+        false,   # transpose:
+        nil,     # headers:
+        false,   # pass:
+        $stderr, # output:
+        'xyy',   # fmt:
+        false,   # progressive:
+        nil,     # encoding:
+        false,   # color_names:
+        false    # debug:
       )
 
       @params = Parameters.new