Install pipfile packages with pipenv shell if environment doesn't exist

[fosteram27]

Is your feature request related to a problem? Please describe.

I'm always frustrated when I have to run both pipenv install and pipenv shell when creating a new environment in a local repo that includes both pipfile and pipfile.lock

Describe the solution you'd like

When running pipenv shell from a directory where a pipenv does not exist, I would like it to check for a pipfile in the same directory and install the packages if one exists.

Describe alternatives you've considered

I looked for this as an option for pipenv shell and did not see one. I tried to consider a use case where you would run pipenv shell for the first time and not want to install the pipfile packages, and I could not. If this use case does exists, please close no action this issue.

Additional context

Add any other context or screenshots about the feature request here. It may be a good idea to mention that platform and Python version you are on.

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Pipenv version: '2025.0.2'

OS Name: 'nt'

User pip version: '25.0.1'