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require 'digest/md5'
# todo: register omissions per file
class FileState
def initialize
@states = Hash.new
@omiter = Hash.new
end
def reset
@states.clear
@omiter.clear
end
def register(filename,omit=nil)
unless @states.key?(filename) then
@states[filename] = Array.new
@omiter[filename] = omit
end
@states[filename] << checksum(filename,@omiter[filename])
end
def update(filename=nil)
[filename,@states.keys].flatten.compact.uniq.each do |fn|
register(fn)
end
end
def inspect(filename=nil)
result = ''
[filename,@states.keys].flatten.compact.uniq.sort.each do |fn|
if @states.key?(fn) then
result += "#{fn}: #{@states[fn].inspect}\n"
end
end
result
end
def changed?(filename)
if @states.key?(filename) then
n = @states[filename].length
if n>1 then
changed = @states[filename][n-1] != @states[filename][n-2]
else
changed = true
end
else
changed = true
end
return changed
end
def checksum(filename,omit=nil)
sum = ''
begin
if FileTest.file?(filename) && (data = IO.read(filename)) then
data.gsub!(/\n.*?(#{[omit].flatten.join('|')}).*?\n/) do "\n" end if omit
sum = Digest::MD5.hexdigest(data).upcase
end
rescue
sum = ''
end
return sum
end
def stable?
@states.keys.each do |s|
return false if changed?(s)
end
return true
end
end
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