Run fluent-plugin-config-format for all built-in plugins

all.rb

require_relative "./lib/fluent/test/helpers"
require_relative "./lib/fluent/command/plugin_config_formatter"

Dir.glob("./lib/fluent/plugin/*.rb").each do |entry|
  require_relative entry
end

require_relative "./lib/fluent/load"

include Fluent::Test::Helpers

hash = {}
Fluent::Plugin::INPUT_REGISTRY.map.keys.each do |name|
  hash["input #{name}"] = ["--format=json", "input", name]
end
Fluent::Plugin::OUTPUT_REGISTRY.map.keys.each do |name|
  hash["output #{name}"] = ["--format=json", "output", name]
end
Fluent::Plugin::FILTER_REGISTRY.map.keys.each do |name|
  hash["filter #{name}"] = ["--format=json", "filter", name]
end
Fluent::Plugin::BUFFER_REGISTRY.map.keys.each do |name|
  hash["buffer #{name}"] = ["--format=json", "buffer", name]
end
Fluent::Plugin::STORAGE_REGISTRY.map.keys.each do |name|
  hash["storage #{name}"] = ["--format=json", "storage", name]
end
Fluent::Plugin::PARSER_REGISTRY.map.keys.each do |name|
  hash["parser #{name}"] = ["--format=json", "parser", name]
end
Fluent::Plugin::FORMATTER_REGISTRY.map.keys.each do |name|
  hash["formatter #{name}"] = ["--format=json", "formatter", name]
end

hash.each do |key, argv|
  next if [:tcp, :unix].include?(argv.last) # skip obsolete out_tcp, out_unix
  begin
    capture_stdout do
      $log = $stdout
      FluentPluginConfigFormatter.new(argv).call
    end
  rescue => ex
    p [argv, ex]
    #puts ex.backtrace
  end
end

result.txt

$ bundle exec ruby all.rb
[["input", :syslog], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["input", :http], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["input", :exec], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["output", :exec_filter], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["output", :exec], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["output", :stdout], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["output", :file], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["output", :null], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["output", :forward], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["filter", :stdout], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["buffer", :file], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["parser", :regexp], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["parser", :json], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["parser", :ltsv], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["parser", :syslog], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["parser", :apache_error], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["parser", :nginx], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["parser", :apache], #<NoMethodError: undefined method `first' for nil:NilClass>]
[["formatter", :out_file], #<NoMethodError: undefined method `first' for nil:NilClass>]