1 files changed, 46 insertions, 0 deletions

diff --git a/lib/pronto/eslint-npm.rb b/lib/pronto/eslint-npm.rb
new file mode 100644
index 0000000..a3219eb
--- /dev/null
+++ b/lib/pronto/eslint-npm.rb
@@ -0,0 +1,46 @@
+require 'pronto'
+
+module Pronto
+  class ESLintNpm < Runner
+    def run
+      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)
+      @_repo_path ||= @patches.first.repo.path
+
+      offences =
+        Dir.chdir(@_repo_path) do
+          JSON.parse(`eslint #{Shellwords.escape(patch.new_file_full_path.to_s)} -f json`)
+        end
+
+      offences =
+        offences
+          .select { |offence| offence['errorCount'] > 0 || offence['warningCount'] > 0 } # no warning or error, no problem
+          .map { |offence| offence['messages'] } # get error messages for that file
+          .flatten
+          .select { |offence| offence['line'] } # for now ignore errors without a line number
+
+      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'], nil, self.class)
+    end
+
+    def js_file?(path)
+      %w(.js .es6 .js.es6).include?(File.extname(path))
+    end
+  end
+end