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Separate usage into usage/help/description
This commit implements a clear distinction between usage, help, and description as in the argparse module. usage shows how the command might be executed on the command line. help is a short description for a command. description is a longer description for a command. Before this commit, we didn't have a way to change description without changing usage. This could be a nuisance for someone who wanted to see the generate usage. For instance, if we ran `manage.py somecommand -h`, we've seen something like this so far: usage: Some descriptions for the command. optional arguments: -h, --help show this help message and exit ... If we added usage manually to the docstring of the command, then the output of `manage.py -h` would become ugly. The only way to get around these problems is to use diffrent variables, namely help and description.
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