scripts/release in ddtelemetry-1.0.0a2 vs scripts/release in ddtelemetry-1.0.0a3

@@ -1,41 +1,30 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
 require 'fileutils'
+require 'json'
 require 'octokit'
+require 'shellwords'
+require 'uri'
 
 def run(*args)
-  puts 'I will execute the following:'
-  puts '    ' + args.map { |a| a =~ /\s/ ? a.inspect : a }.join(' ')
-  print 'Is this correct? [y/N] '
-  res = gets
-  unless res.strip.casecmp('y').zero?
-    warn 'Answer was not Y; release aborted.'
-    exit 1
-  end
-
-  system('echo', *args)
+  puts('<exec> ' + args.map { |s| Shellwords.escape(s) }.join(' '))
   system(*args)
-
-  print 'Continue? [y/N] '
-  res = gets
-  unless res.strip.casecmp('y').zero?
-    warn 'Answer was not Y; release aborted.'
-    exit 1
-  end
-
-  true
 end
 
+gem_name = 'ddtelemetry'
+version_constant = 'DDTelemetry::VERSION'
+gem_path = 'ddtelemetry'
+
 puts '=== Logging in to GitHub’s API…'
 client = Octokit::Client.new(netrc: true)
 puts
 
 puts '=== Deleting old *.gem files…'
 Dir['*.gem'].each do |fn|
-  puts "  #{fn}…"
+  puts "deleting #{fn}…"
   FileUtils.rm_f(fn)
 end
 puts
 
 puts '=== Verifying presence of release date…'
@@ -43,16 +32,44 @@
   warn 'No proper release date found!'
   exit 1
 end
 puts
 
+puts '=== Reading version…'
+require "./lib/#{gem_path}/version"
+version = eval(version_constant) # rubocop:disable Security/Eval
+puts "Version = #{version}"
+puts
+
 puts '=== Building new gem…'
 run('gem', 'build', 'ddtelemetry.gemspec')
 puts
 
-puts '=== Reading version…'
-require './lib/ddtelemetry/version'
-puts "Version = #{DDTelemetry::VERSION}"
+puts '=== Verifying that gems were built properly…'
+gem_filename = "#{gem_name}-#{version}.gem"
+unless File.file?(gem_filename)
+  warn "Error: Could not find gem: #{gem_filename}"
+  exit 1
+end
+puts
+
+puts '=== Verifying that gem version does not yet exist…'
+url = URI.parse("https://rubygems.org/api/v1/versions/#{gem_name}.json")
+response = Net::HTTP.get_response(url)
+existing_versions =
+  case response.code
+  when '404'
+    []
+  when '200'
+    JSON.parse(response.body).map { |e| e.fetch('number') }
+  else
+    warn "Error: Couldn’t fetch version information for #{gem_name} (status #{response.code})"
+    exit 1
+  end
+if existing_versions.include?(version)
+  warn "Error: #{gem_name} v#{version} already exists"
+  exit 1
+end
 puts
 
 puts '=== Verifying that release does not yet exist…'
 releases = client.releases('ddfreyne/ddtelemetry')
 release = releases.find { |r| r.tag_name == DDTelemetry::VERSION }