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Resolve "tab completion of bec and other globals do not work anymore"

guijar_m requested to merge 253-tab-completion-of-bec-and-other-globals-do-not-work-anymore into master

Description

Current code initializes BEC and starts IPython, however the BEC globals are not in the same namespace as IPython globals. As a consequence, completion of bec.<tab> does not work, even though bec is found as being part of builtins module (just to add more info: doing b=bec then b.<tab> in the shell would make completion ok again on the b object).

New code proposed by this MR, initializes IPython and takes care of command line arguments parsing etc ; then, it executes a BEC startup script -> in this case, IPython calls exec() in its global namespace and bec.<tab> completion is regained. Some options have to be passed to the startup script, this is done via bec_client.main module, which contains a main_dict dictionary.

In order to avoid polluting the freshly created IPython environment, some globals from bec_startup.py are prefixed with _.

A test has been added, to prevent this issue from reappearing in the future.

Closes #253 (closed)

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