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This PR has two parts. The first part is the addition of the `Stack::set_pwd()` API. It strips trailing slashes from paths for convenience, but will reject otherwise bad paths, leaving PWD in a good state. This should reduce the impact of faulty code incorrectly trying to set PWD. (https://github.com/nushell/nushell/pull/12760#issuecomment-2095393012) The second part is implementing a PWD recovery mechanism. PWD can become bad even when we did nothing wrong. For example, Unix allows you to remove any directory when another process might still be using it, which means PWD can just "disappear" under our nose. This PR makes it possible to use `cd` to reset PWD into a good state. Here's a demonstration: ```sh mkdir /tmp/foo cd /tmp/foo # delete "/tmp/foo" in a subshell, because Nushell is smart and refuse to delete PWD nu -c 'cd /; rm -r /tmp/foo' ls # Error: × $env.PWD points to a non-existent directory # help: Use `cd` to reset $env.PWD into a good state cd / pwd # prints / ``` Also, auto-cd should be working again. |
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