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I want to initialize a lean project but the folder I have already exists. How do I do this?

e.g.,

# -- Go to a folder where you want to create a project in a subfolder my_project, and type lake +leanprover/lean4:nightly-2023-02-04 new my_project math.
cd $HOME
lake +leanprover/lean4:nightly-2023-02-04 new my_project math

but I get the following error

~ ❯ mkdir my_project
mkdir: my_project: File exist

I do not want to alter the contents or move my_project, but have the lake command do whatever it needs to do even if the folder exists. I do not want to move the contents out of my_project etc. Just that lake +leanprover/lean4:nightly-2023-02-04 new my_project math works even if the folder exists.

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  • $\begingroup$ Change my_project to any name you want that doesn't match an existing directory. $\endgroup$ Feb 23 at 2:45
  • $\begingroup$ What do you want to happen if my_project contains files whose names are the same as project system files which lake wants to create as part of the process of creating a new project? What do you want to happen if my_project is already a git repo? My instinct is that you should solve these questions yourself by renaming my_project to foo, using lake to create my_project and then copying the files from foo back into my_project, being very careful if there are any name clashes. $\endgroup$ Feb 24 at 15:37

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