Is there a way to capture the warnings, something like rescue for exceptions? I do not want to simply disable the warnings (by doing $VERBOSE = nil) but want to capture the content of the warning messages during run time.
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3 Answers
You can redirect stderr to a StringIO object to capture the warnings output in a string:
require 'stringio' old_stderr = $stderr $stderr = StringIO.new Foo = 1 Foo = 2 # generates a warning puts $stderr.string # prints the warning $stderr = old_stderr 
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require 'stringio' def capture_stderr old, $stderr = $stderr, StringIO.new result = yield [result, $stderr.string] ensure $stderr = old end 
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This is kinda ugly because you will be writing to files and you might not have permission to write to them, and it will hide ALL output to $stderr, not just the warnings, but it works:
$stderr.reopen("errors.txt") MyConst = 4 MyConst = 5 # generates a warning on the standard error output $stderr.reopen("errors2.txt") puts "The following errors happened:" puts File.read("errors.txt") 
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sawa
Can it be redirected to some Ruby internal IO rather than an external file?