In the latest 0.83 development releases (that will lead to 0.84) we created the file ~/.sugar/debug All the logging options are uncommented by default. Just remove the '#' before the line 'export SUGAR_LOGGER_LEVEL=debug' to enable Sugar debug logging.
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In the latest 0.83 development releases (that will lead to 0.84) we created the file text file ~/.sugar/debug which gets read at sugar startup.
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All the logging options are commented by default. Use your editor of choice and remove the '#' before the line 'export SUGAR_LOGGER_LEVEL=debug' to enable Sugar debug logging.