Powershell: Delimit envrionment variable names when setting #1255
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Without this many exports, such as `$env:'depsBuildTargetPropagated'='';`,
are not valid Powershell and result in an error being thrown:
```
Invoke-Expression -Command $export;
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| Variable reference is not valid. ':' was not followed by a valid
| variable name character. Consider using ${} to delimit the name
```
The quotes around escaped variable names cause Powershell to be confused
because it can't figure out what is part of the variable reference. So just
delimit the name to make it clear what's part of the name and what's part
of the value.
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This is the simplest fix for the problem outlined in #1254: It just uses a brace pattern to delimit what the environment variable name key should be regardless of how
keyneeds escaped. This lets it determine that the escape quotes are only for key instantiation.With this patch
cding in and out of my project directory works exactly like I'd expect and has no errors.There might be another fix, like stripping unnecessary quoting, but this seems more robust and like it will work in more cases. I don't know how to write a test for this specific issue though since I'm unsure of how to minimize a Nix flake's output into
direnv's test case definitions. If regression tests are wanted, help is appreciated please :)cc @bamsammich as the original PowerShell support implementer
Closes #1254