1 files changed, 36 insertions, 0 deletions

diff --git a/lib/pronto/eslint.rb b/lib/pronto/eslint.rb
new file mode 100644
index 0000000..67e9229
--- /dev/null
+++ b/lib/pronto/eslint.rb
@@ -0,0 +1,36 @@
+require 'pronto'
+require 'eslintrb'
+
+module Pronto
+  class ESLint < Runner
+    def run(patches, _)
+      return [] unless patches
+
+      patches.select { |patch| patch.additions > 0 }
+        .select { |patch| js_file?(patch.new_file_full_path) }
+        .map { |patch| inspect(patch) }
+        .flatten.compact
+    end
+
+    def inspect(patch)
+      options = File.exist?('.eslintrc') ? :eslintrc : :defaults
+      offences = Eslintrb.lint(patch.new_file_full_path, options).compact
+
+      offences.map do |offence|
+        patch.added_lines.select { |line| line.new_lineno == offence['line'] }
+          .map { |line| new_message(offence, line) }
+      end
+    end
+
+    def new_message(offence, line)
+      path = line.patch.delta.new_file[:path]
+      level = :warning
+
+      Message.new(path, line, level, offence['message'])
+    end
+
+    def js_file?(path)
+      File.extname(path) == '.js'
+    end
+  end
+end