exe/gemfilelint in gemfilelint-0.1.0 vs exe/gemfilelint in gemfilelint-0.2.0

@@ -2,6 +2,14 @@
 # frozen_string_literal: true
 
 $LOAD_PATH.unshift(File.expand_path(File.join('..', 'lib'), __dir__))
 require 'gemfilelint'
 
-exit Gemfilelint.lint(ARGV[0] || 'Gemfile')
+gemfiles = ARGV.any? ? ARGV : './Gemfile'
+
+invalid = gemfiles.reject { |gemfile| File.file?(gemfile) }
+if invalid.any?
+  warn("Could not find a gemfile at: #{invalid.join(', ')}")
+  exit 2
+end
+
+exit Gemfilelint.lint(*gemfiles) ? 0 : 1