Add --prevent-empty-failure flag

lib/erb_lint/cli.rb

@@ -42,6 +42,10 @@ def run(args = ARGV)
       if [email protected]? && lint_files.empty?
         failure!("no files found...\n")
       elsif lint_files.empty?
+        if @options[:prevent_empty_failure]
+          success!('No files found or given, skipping because "--prevent-empty-failure" flag was passed')
+        end
+
         failure!("no files found or given, specify files or config...\n#{option_parser}")
       end
 
@@ -280,6 +284,10 @@ def option_parser
           @options[:autocorrect] = config
         end
 
+        opts.on("--prevent-empty-failure", "Skip the linter check if no files match the given glob [default: #{DEFAULT_LINT_ALL_GLOB}]") do
+          @options[:prevent_empty_failure] = true
+        end
+
         opts.on_tail("-h", "--help", "Show this message") do
           success!(opts)
         end

spec/erb_lint/cli_spec.rb

@@ -273,6 +273,19 @@ def run(_processed_source)
       end
     end
 
+    context 'with --prevent-empty-failure' do
+      let(:args) { ['--prevent-empty-failure'] }
+
+      context 'when there are no files' do
+        before do
+          allow(cli).to(receive(:glob).and_return("no/file/glob"))
+        end
+
+        it { expect { subject }.not_to output(/no files found/).to_stderr }
+        it { expect { subject }.to output(/No files found or given, skipping because "--prevent-empty-failure" flag was passed/).to_stdout }
+      end
+    end
+
     context 'with unknown argument' do
       let(:args) { ['--foo'] }