truncate a log file to 1000 lines if the file size > 1Mb.

.gitignore

@@ -1,3 +1,5 @@
+.rvmrc
+
 # rcov generated
 coverage
 

README.rdoc

@@ -1,6 +1,6 @@
 = rails_log_autotruncator
 
-Description goes here.
+rails_log_autotruncator is a simple patch for ActiveSupport::BufferedLogger that limits a log file size. Use it if you just don't want your rails project development log file becomes large.
 
 == Contributing to rails_log_autotruncator
 

Rakefile

@@ -7,33 +7,33 @@ Jeweler::Tasks.new do |gem|
   gem.name = "rails_log_autotruncator"
   gem.homepage = "http://github.com/plashchynski/rails_log_autotruncator"
   gem.license = "MIT"
-  gem.summary = %Q{The tool for automatically rotating and truncating a rails log files while keeping the last N lines}
-  gem.description = %Q{TODO: longer description of your gem}
+  gem.summary = %Q{The tool for automatically rotating and truncating a rails development log file}
+  gem.description = %Q{rails_log_autotruncator is a simple patch for ActiveSupport::BufferedLogger that limits a log file size. Use it if you just don't want your rails project development log file becomes large.}
   gem.email = "plashchynski@gmail.com"
   gem.authors = ["Dmitry Plashchynski"]
   # Include your dependencies below. Runtime dependencies are required when using your gem,
   # and development dependencies are only needed for development (ie running rake tasks, tests, etc)
   #  gem.add_runtime_dependency 'jabber4r', '> 0.1'
   #  gem.add_development_dependency 'rspec', '> 1.2.3'
-  gem.add_development_dependency "rspec", "~> 2.3.0"
+  # gem.add_development_dependency "rspec", "~> 2.3.0"
   gem.add_development_dependency "bundler", "~> 1.0.0"
   gem.add_development_dependency "jeweler", "~> 1.5.2"
   gem.add_development_dependency "rcov", ">= 0"
 end
 Jeweler::RubygemsDotOrgTasks.new
 
-require 'rspec/core'
-require 'rspec/core/rake_task'
-RSpec::Core::RakeTask.new(:spec) do |spec|
-  spec.pattern = FileList['spec/**/*_spec.rb']
-end
-
-RSpec::Core::RakeTask.new(:rcov) do |spec|
-  spec.pattern = 'spec/**/*_spec.rb'
-  spec.rcov = true
-end
-
-task :default => :spec
+# require 'rspec/core'
+# require 'rspec/core/rake_task'
+# RSpec::Core::RakeTask.new(:spec) do |spec|
+#   spec.pattern = FileList['spec/**/*_spec.rb']
+# end
+# 
+# RSpec::Core::RakeTask.new(:rcov) do |spec|
+#   spec.pattern = 'spec/**/*_spec.rb'
+#   spec.rcov = true
+# end
+# 
+# task :default => :spec
 
 require 'rake/rdoctask'
 Rake::RDocTask.new do |rdoc|

init.rb

@@ -0,0 +1 @@
+require 'rails_log_autotruncator'

lib/rails_log_autotruncator.rb

@@ -0,0 +1,28 @@
+module ActiveSupport
+  class BufferedLogger
+    def flush
+      @guard.synchronize do
+        unless buffer.empty?
+          old_buffer = buffer
+          all_content = StringIO.new
+          old_buffer.each do |content|
+            all_content << content
+          end
+          @log.write(all_content.string)
+        end
+
+        if @log.size > 1_000_000
+          log = @log.path
+          @log.close
+          File.atomic_write(log) do |file|
+            file.write(IO.readlines(log)[-1000..-1].join)
+          end
+          @log = open(log, (File::WRONLY | File::APPEND | File::CREAT))
+          @log.sync = true
+        end
+
+        clear_buffer
+      end
+    end
+  end
+end