rubocop.rb in slim_lint-0.15.0

- old
+ new

@@ -1,9 +1,8 @@
 require 'slim_lint/ruby_extractor'
 require 'slim_lint/ruby_extract_engine'
 require 'rubocop'
-require 'tempfile'
 
 module SlimLint
   # Runs RuboCop on Ruby code extracted from Slim templates.
   class Linter::RuboCop < Linter
     include LinterRegistry
@@ -28,22 +27,14 @@
     # @param source_map [Hash] map of Ruby code line numbers to original line
     #   numbers in the template
     def find_lints(ruby, source_map)
       rubocop = ::RuboCop::CLI.new
 
-      original_filename = document.file || 'ruby_script'
-      filename = "#{File.basename(original_filename)}.slim_lint.tmp"
-      directory = File.dirname(original_filename)
+      filename = document.file ? "#{document.file}.rb" : 'ruby_script.rb'
 
-      Tempfile.open([filename, '.rb'], directory) do |f|
-        begin
-          f.write(ruby)
-          f.close
-          extract_lints_from_offenses(lint_file(rubocop, f.path), source_map)
-        ensure
-          f.unlink
-        end
+      with_ruby_from_stdin(ruby) do
+        extract_lints_from_offenses(lint_file(rubocop, filename), source_map)
       end
     end
 
     # Defined so we can stub the results in tests
     #
@@ -74,10 +65,27 @@
     #
     # @return [Array<String>]
     def rubocop_flags
       flags = %w[--format SlimLint::OffenseCollector]
       flags += ['--config', ENV['SLIM_LINT_RUBOCOP_CONF']] if ENV['SLIM_LINT_RUBOCOP_CONF']
+      flags += ['--stdin']
       flags
+    end
+
+    # Overrides the global stdin to allow RuboCop to read Ruby code from it.
+    #
+    # @param ruby [String] the Ruby code to write to the overridden stdin
+    # @param _block [Block] the block to perform with the overridden stdin
+    # @return [void]
+    def with_ruby_from_stdin(ruby, &_block)
+      original_stdin = $stdin
+      stdin = StringIO.new
+      stdin.write(ruby)
+      stdin.rewind
+      $stdin = stdin
+      yield
+    ensure
+      $stdin = original_stdin
     end
   end
 
   # Collects offenses detected by RuboCop.
   class OffenseCollector < ::RuboCop::Formatter::BaseFormatter