IORedirect
A class to redirect $stdout, or other IO object, to a StringIO object, or any other object with a write() method.
Synopsis
s = StringIO.new r = Redirector.redirect($stdout, s) do $stdout.puts "this is a test" end
Methods
Public Class methods
Start redirection from one IO object to any other object with a write() method. from is the IO object to redirect from, and to is the object to redirect to.
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# File lib/facets/more/ioredirect.rb, line 44 def initialize(from, to) @from = from @to = to start() end
An exception-safe class method for redirection
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# File lib/facets/more/ioredirect.rb, line 76 def self.redirect(from, to) s = self.new(from, to) begin yield ensure s.stop end end
Public Instance methods
Start redirection, if it has not already been started.
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# File lib/facets/more/ioredirect.rb, line 51 def start raise "Redirection already in progress" if @t tmp = @from.dup r, w = IO.pipe @from.reopen(w) @t = Thread.new do begin loop do s = r.read(1) # TODO: can I make this buffered? @to.write(s) end ensure @from.reopen(tmp) @t = nil end end end
Stop redirection, if it is occurring
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# File lib/facets/more/ioredirect.rb, line 70 def stop raise "Redirection already stopped" if not @t @t.kill end