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module Rails
module Rack
class LogTailer
def initialize(app, log = nil)
@app = app
path = Pathname.new(log || "#{File.expand_path(Rails.root)}/log/#{Rails.env}.log").cleanpath
@cursor = ::File.size(path)
@file = ::File.open(path, 'r')
end
def call(env)
response = @app.call(env)
tail!
response
end
def tail!
@file.seek @cursor
unless @file.eof?
contents = @file.read
@cursor = @file.tell
$stdout.print contents
end
end
end
end
end
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