class Sprockets::Manifest

def clean(count = 2, age = 3600)


age=600.
To only keep files created within the last 10 minutes, set count=0 and

To force only 1 backup to be kept, set count=1 and age=0.

Examples

keep the latest version, 2 backups and any created within the past hour.
Cleanup old assets in the compile directory. By default it will 
def clean(count = 2, age = 3600)
  asset_versions = files.group_by { |_, attrs| attrs['logical_path'] }
  asset_versions.each do |logical_path, versions|
    current = assets[logical_path]
    versions.reject { |path, _|
      path == current
    }.sort_by { |_, attrs|
      # Sort by timestamp
      Time.parse(attrs['mtime'])
    }.reverse.each_with_index.drop_while { |(_, attrs), index|
      age = [0, Time.now - Time.parse(attrs['mtime'])].max
      # Keep if under age or within the count limit
      age < age || index < count
    }.each { |(path, _), _|
       # Remove old assets
      remove(path)
    }
  end
end