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