Sha256: 16381539beb725dbfa36bf2a192a2064c15cab153427cccdd89b4c05afca1c6f
Contents?: true
Size: 1.39 KB
Versions: 7
Compression:
Stored size: 1.39 KB
Contents
=begin
Copyright 2010-2013 Tasos Laskos <tasos.laskos@gmail.com>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
=end
class IO
TAIL_BUF_LENGTH = 1 << 16
#
# @param [Integer] n
# Amount of lines to return from the bottom of the file.
#
# @return [Array<String>]
# `n` amount of lines from the bottom of the file.
#
# @see http://stackoverflow.com/questions/3024372/how-to-read-a-file-from-bottom-to-top-in-ruby/3024704#3024704
#
def tail( n )
return [] if n < 1
seek_to = TAIL_BUF_LENGTH
seek_to = size if seek_to > size
seek -seek_to, IO::SEEK_END
buf = ''
while buf.count( "\n" ) <= n
buf = read( seek_to ) + buf
seek_to *= 2
seek_to = size if seek_to > size
seek -seek_to, IO::SEEK_CUR
end
buf.split( "\n" )[-n..-1]
end
end
Version data entries
7 entries across 7 versions & 1 rubygems