Add --stdin-file-path option

README.md

@@ -62,6 +62,7 @@ Command Line Flag         | Description
 `-e`/`--exclude`          | Exclude one or more files from being linted
 `-i`/`--include-linter`   | Specify which linters you specifically want to run
 `-x`/`--exclude-linter`   | Specify which linters you _don't_ want to run
+`--stdin-file-path`       | Pipe source from STDIN, using file in offense reports
 `--[no-]color`            | Whether to output in color
 `--reporter [reporter]`   | Specify which output formatter to use
 `--show-linters`          | Show all registered linters

lib/slim_lint/options.rb

@@ -73,6 +73,11 @@ def add_file_options(parser)
                 'List of file names to exclude') do |files|
         @options[:excluded_files] = files
       end
+
+      parser.on('--stdin-file-path file', String,
+                'Pipe source from STDIN, using file in offense reports.') do |file|
+        @options[:stdin_file_path] = file
+      end
     end
 
     # Register informational flags.

lib/slim_lint/runner.rb

@@ -19,9 +19,14 @@ def run(options = {})
 
       linter_selector = SlimLint::LinterSelector.new(config, options)
 
-      lints = files.map do |file|
-        collect_lints(file, linter_selector, config)
-      end.flatten
+      lints =
+        if options[:stdin_file_path].nil?
+          files.map do |file|
+            collect_lints(File.read(file), file, linter_selector, config)
+          end.flatten
+        else
+          collect_lints($stdin.read, options[:stdin_file_path], linter_selector, config)
+        end
 
       SlimLint::Report.new(lints, files)
     end
@@ -49,14 +54,14 @@ def load_applicable_config(options)
     # @param file [String] path to file to lint
     # @param linter_selector [SlimLint::LinterSelector]
     # @param config [SlimLint::Configuration]
-    def collect_lints(file, linter_selector, config)
+    def collect_lints(file_content, file_name, linter_selector, config)
       begin
-        document = SlimLint::Document.new(File.read(file), file: file, config: config)
+        document = SlimLint::Document.new(file_content, file: file_name, config: config)
       rescue SlimLint::Exceptions::ParseError => e
         return [SlimLint::Lint.new(nil, file, e.lineno, e.error, :error)]
       end
 
-      linter_selector.linters_for_file(file).map do |linter|
+      linter_selector.linters_for_file(file_name).map do |linter|
         linter.run(document)
       end.flatten
     end

spec/slim_lint/options_spec.rb

@@ -41,6 +41,14 @@
       end
     end
 
+    context 'with input from stdin' do
+      let(:args) { %w[--stdin-file-path file1.slim] }
+
+      it 'sets the `stdin_file_path` option to passed file name' do
+        subject.should include stdin_file_path: 'file1.slim'
+      end
+    end
+
     context 'with a reporter option' do
       context 'for a reporter that exists' do
         let(:args) { %w[--reporter Json] }

spec/slim_lint/runner_spec.rb

@@ -24,6 +24,7 @@
 
     before do
       runner.stub(:collect_lints).and_return([])
+      File.stub(:read).and_return('.myclass')
     end
 
     it 'searches for lints in each file' do
@@ -62,5 +63,18 @@
         subject
       end
     end
+
+    context 'when `--stdin-file-path` option specified' do
+      let(:options) { { stdin_file_path: 'file1.slim' } }
+
+      before do
+        $stdin.stub(:read).and_return('.myclass')
+      end
+
+      it 'searches for lints from STDIN' do
+        runner.should_receive(:collect_lints).exactly(1).times
+        subject
+      end
+    end
   end
 end