Add a CLI option to override the path to logfile

lib/electric_sheep/cli.rb

@@ -10,6 +10,8 @@ def self.startup_options
       process_options
       option :workers, aliases: %w(-w), type: :numeric,
         desc: 'Maximum number of parallel workers', default: 1
+      option :logfile, aliases: %w(-l), type: :string,
+        desc: 'Override path to log file', default: './electric_sheep.log'
     end
 
     def self.run_options
@@ -93,8 +95,8 @@ def stdout_logger
     end
 
     def file_logger
-      # TODO Configure logger output
-      Lumberjack::Logger.new("electric_sheep.log", level: log_level)
+      path=File.expand_path(options[:logfile] || 'electric_sheep.log')
+      Lumberjack::Logger.new(path, level: log_level)
     end
 
     def logger

spec/electric_sheep/cli_spec.rb

@@ -11,8 +11,9 @@ def expects_stdout_logger(level)
       returns(logger)
   end
 
-  def expects_file_logger(level)
-    Lumberjack::Logger.expects(:new).with("electric_sheep.log", {level: level}).
+  def expects_file_logger(level, path=nil)
+    Lumberjack::Logger.expects(:new).
+      with(path || File.expand_path("electric_sheep.log"), {level: level}).
       returns(logger)
   end
 
@@ -61,6 +62,12 @@ def self.ensure_exception_handling(&block)
     end
   end
 
+  it 'overrides the path to logfile' do
+    Lumberjack::Logger.expects(:new).
+      with('/var/log/electric_sheep.log', level: :info)
+    subject.new([], logfile: '/var/log/electric_sheep.log').send(:file_logger)
+  end
+
   describe 'working' do
 
     describe 'on successful invocation' do