cli_parser: Refactor required argument for flag to '='

Library/Homebrew/cli_parser.rb

@@ -34,14 +34,15 @@ module Homebrew
         end
       end
 
-      def flag(name, description: nil, required: false)
-        if required
-          option_required = OptionParser::REQUIRED_ARGUMENT
+      def flag(name, description: nil)
+        if name.end_with? "="
+          required = OptionParser::REQUIRED_ARGUMENT
+          name.chomp! "="
         else
-          option_required = OptionParser::OPTIONAL_ARGUMENT
+          required = OptionParser::OPTIONAL_ARGUMENT
         end
         description = option_to_description(name) if description.nil?
-        @parser.on(name, description, option_required) do |option_value|
+        @parser.on(name, description, required) do |option_value|
           @parsed_args[option_to_name(name)] = option_value
         end
       end

Library/Homebrew/dev-cmd/pull.rb

@@ -86,8 +86,8 @@ module Homebrew
       switch "--warn-on-publish-failure"
       switch :verbose
       switch :debug
-      flag   "--bintray-org",   required: true
-      flag   "--test-bot-user", required: true
+      flag   "--bintray-org="
+      flag   "--test-bot-user="
     end
 
     if ARGV.named.empty?

Library/Homebrew/dev-cmd/tests.rb

@@ -29,8 +29,8 @@ module Homebrew
       switch "--online"
       switch :debug
       switch :verbose
-      flag   "--only", required: true
-      flag   "--seed", required: true
+      flag   "--only="
+      flag   "--seed="
     end
 
     HOMEBREW_LIBRARY_PATH.cd do

Library/Homebrew/dev-cmd/update-test.rb

@@ -25,8 +25,8 @@ module Homebrew
       switch "--keep-tmp"
       switch :verbose
       switch :debug
-      flag   "--commit", required: true
-      flag   "--before", required: true
+      flag   "--commit="
+      flag   "--before="
     end
 
     ENV["HOMEBREW_UPDATE_TEST"] = "1"

Library/Homebrew/test/cli_parser_spec.rb

@@ -51,7 +51,7 @@ describe Homebrew::CLI::Parser do
   describe "test long flag options" do
     subject(:parser) {
       described_class.new do
-        flag        "--filename", description: "Name of the file", required: true
+        flag        "--filename=", description: "Name of the file"
         comma_array "--files",     description: "Comma separated filenames"
       end
     }
@@ -61,7 +61,7 @@ describe Homebrew::CLI::Parser do
       expect(args.filename).to eq "random.txt"
     end
 
-    it "raises an exception when a flag's required arg is not passed" do
+    it "raises an exception when a flag's required value is not passed" do
       expect { parser.parse(["--filename"]) }.to raise_error(OptionParser::MissingArgument, /--filename/)
     end