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#!ruby
require_relative 'vpath'
class Checksum
def initialize(vpath)
@vpath = vpath
end
attr_reader :source, :target
def source=(source)
@source = source
@checksum = File.basename(source, ".*") + ".chksum"
end
def target=(target)
@target = target
end
def update?
src = @vpath.read(@source)
@len = src.length
@sum = src.sum
return false unless @vpath.search(File.method(:exist?), @target)
begin
data = @vpath.read(@checksum)
rescue
return false
else
return false unless data[/src="([0-9a-z_.-]+)",/, 1] == @source
return false unless @len == data[/\blen=(\d+)/, 1].to_i
return false unless @sum == data[/\bchecksum=(\d+)/, 1].to_i
return true
end
end
def update!
open(@checksum, "wb") {|f|
f.puts("src=\"#{@source}\", len=#{@len}, checksum=#{@sum}")
}
end
def update
return true if update?
update! if ret = yield(self)
ret
end
def copy(name)
@vpath.open(name, "rb") {|f|
IO.copy_stream(f, name)
}
true
end
def make(*args)
system(@make, *args)
end
def def_options(opt = (require 'optparse'; OptionParser.new))
@vpath.def_options(opt)
opt.on("--make=PATH") {|v| @make = v}
opt
end
def self.update(argv)
k = new(VPath.new)
k.source, k.target, *argv = k.def_options.parse(*argv)
k.update {|k| yield(k, *argv)}
end
end
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