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docs: document good and problematic option placements, see #3356

(cherry picked from commit e3cb7c3c32)
This commit is contained in:
Thomas Waldmann 2017-11-25 19:46:48 +01:00
parent 938d122191
commit 21afd17f2f

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@ -1,3 +1,20 @@
Positional Arguments and Options: Order matters
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Borg only supports taking options (``-s`` and ``--progress`` in the example)
to the left or right of all positional arguments (``repo::archive`` and ``path``
in the example), but not in between them:
::
borg create -s --progress repo::archive path # good and preferred
borg create repo::archive path -s --progress # also works
borg create -s repo::archive path --progress # works, but ugly
borg create repo::archive -s --progress path # BAD
This is due to a problem in the argparse module: http://bugs.python.org/issue15112
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