add a json output option

Author: Daniel-N-Huss

lib/gem_dating/cli.rb

@@ -14,6 +14,7 @@ class Cli
           --older-than=<AGE>, --ot=<AGE>    Filter gems updated within the last X (e.g. 2y, 1m, 4w, 10d)
           --sort-by=<FIELD>                 Sort by field (name or date), defaults to name
           --order=<DIRECTION>               Sort direction (asc or desc), defaults to asc
+          --json                            Output results as JSON
       HELP
 
     def initialize(argv = [])
@@ -42,7 +43,9 @@ def run
         end
       end
 
-      $stdout << GemDating.from_file(@file_path, @options).table_print << "\n"
+      result = GemDating.from_file(@file_path, @options)
+      output = @options[:json] ? result.to_json : result.table_print
+      $stdout << output << "\n"
 
       SUCCESS
     end
@@ -52,6 +55,7 @@ def run
     def parse_args(args = @args)
       options = {}
       options[:help] = true if (args & %w[-h --help -?]).any?
+      options[:json] = true if args.include?("--json")
 
       if (older_than = args.find { |arg| arg.start_with?("--older-than=", "--ot=") })
         options[:older_than] = older_than.split("=").last

lib/gem_dating/result.rb

@@ -1,4 +1,5 @@
 require "table_print"
+require "json"
 
 module GemDating
   class Result
@@ -25,6 +26,10 @@ def table_print
       TablePrint::Printer.table_print(specs, [:name, :version, {date: {time_format: "%Y-%m-%d", width: 10}}]).encode("utf-8")
     end
 
+    def to_json
+      JSON.generate(to_h)
+    end
+
     def older_than(date)
       specs.select! { |spec| spec.date.to_date < self.cut_off(date) }
       self

test/cli_test.rb

@@ -114,6 +114,9 @@ def test_parse_args
     cli = GemDating::Cli.new(["--help", "--older-than=2y"])
     assert_equal({ help: true, older_than: "2y" }, cli.send(:parse_args))
 
+    cli = GemDating::Cli.new(["--json"])
+    assert_equal({ json: true }, cli.send(:parse_args))
+
     cli = GemDating::Cli.new([])
     assert_equal({}, cli.send(:parse_args))
   end
@@ -155,4 +158,33 @@ def test_sort_by_date_desc
     assert_equal 0, exit_code
     assert_equal expected_out, stdout
   end
+
+  def test_json_output
+    exit_code = nil
+
+    stdout, _stderr = capture_io do
+      exit_code = GemDating::Cli.new(["test/Gemfile.example", "--json"]).run
+    end
+
+    expected_data = {
+      "banana-client" => {
+        "name" => "banana-client",
+        "version" => "21.1.0",
+        "date" => "1990-08-21"
+      },
+      "giraffeql" => {
+        "name" => "giraffeql",
+        "version" => "0.0.2227",
+        "date" => "2023-05-17"
+      },
+      "rails-on-rubies" => {
+        "name" => "rails-on-rubies",
+        "version" => "70.0.5",
+        "date" => "2123-05-24"
+      }
+    }
+
+    assert_equal 0, exit_code
+    assert_equal expected_data, JSON.parse(stdout)
+  end
 end

test/result_test.rb

@@ -58,6 +58,22 @@ def test_hash
     assert_equal expected, @result.to_h
   end
 
+  def test_json
+    expected = {
+      "hi" => {
+        "name" => "hi",
+        "version" => "42.42",
+        "date" => "2015-09-18"
+      },
+      "there" => {
+        "name" => "there",
+        "version" => "1.27.0.01",
+        "date" => "2009-09-02"
+      }
+    }
+    assert_equal expected, JSON.parse(@result.to_json)
+  end
+
   def test_table
     expected = <<-TEXT
       NAME  | VERSION   | DATE