Pkg3: allow upgrading and removing packages from REPL about juleps HOT 4 OPEN

Right – I think there would be less potential for confusion and problems if package management operations don't actually take place in the current process. If you want to use and uninstalled package, you would invoke the installation command, wait on it to complete, and then load the installed package. I also think that a pkg> REPL mode would be really handy.

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I don't think "invoke an external package management mode" necessarily means you have to type commands into another prompt. In my mind this entails spinning up another process with some sort of IPC communication. You could still do Pkg.rm in the current process but it would send that command to a "package management process". Doing using XYZ when XYZ isn't installed could:

• ask if you want to install
• send an "install request" to the package management process
• confirm installation
• call using XYZ

For other commands, nothing would happen after the request is sent to the package management process. The filesystem/etc might change, but nothing in your current Julia session.

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Yes, a pkg> REPL mode sounds like a perfect middleground.

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there would be less potential for confusion and problems if package management operations don't actually take place in the current process

Why, exactly? What problem does this solve? If an existing version of a package is already loaded, modifying it in a different process doesn't make the situation any less confusing unless you warn or force a restart of the process that has loaded the old version.

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