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Versions: 73
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Contents
module Flydata
module Util
module FileUtil
def write_line(file_path, new_value)
File.delete(file_path) if FileTest.exist?(file_path)
File.open(file_path, 'w') do |out|
out.write new_value
end
end
def read_line(file_path, default_value = nil)
ret = nil
if FileTest.exist?(file_path)
ret = File.readlines(file_path).first.to_s.strip
end
ret
end
# snip from https://gist.github.com/shaiguitar/6d926587e98fc8a5e301
def tail(path, num_of_lines)
file = File.open(path, "r")
buffer_s = 512
line_count = 0
file.seek(0, IO::SEEK_END)
offset = file.pos # we start at the end
while line_count <= num_of_lines && offset > 0
to_read = if (offset - buffer_s) < 0
offset
else
buffer_s
end
file.seek(offset-to_read)
data = file.read(to_read)
data.reverse.each_char do |c|
if line_count > num_of_lines
offset += 1
break
end
offset -= 1
if c == "\n"
line_count += 1
end
end
end
file.seek(offset)
data = file.read
end
end
end
end
Version data entries
73 entries across 73 versions & 1 rubygems