ref: 4ad59914e8a570d869f4e66540578cc3bdbc04eb
dir: /sys/src/cmd/hg/mercurial/fancyopts.pyc/
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read args, parse options, and store options in state
each option is a tuple of:
short option or ''
long option
default value
description
option types include:
boolean or none - option sets variable in state to true
string - parameter string is stored in state
list - parameter string is added to a list
integer - parameter strings is stored as int
function - call function with parameter
non-option args are returned
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