# Description
This PR adds new types to `nu-path` to enforce path invariants. Namely,
this PR adds:
- `Path` and `PathBuf`. These types are different from, but analogous to
`std::path::Path` and `std::path::PathBuf`.
- `RelativePath` and `RelativePathBuf`. These types must be/contain
strictly relative paths.
- `AbsolutePath` and `AbsolutePathBuf`. These types must be/contain
strictly absolute paths.
- `CanonicalPath` and `CanonicalPathBuf`. These types must be/contain
canonical paths.
Operations are prohibited as necessary to ensure that the invariants of
each type are upheld (needs double-checking).
Only paths that are absolute (or canonical) can be easily used as /
converted to `std::path::Path`s. This is to help force us to account for
the emulated current working directory instead of accidentally using the
current directory of the Nushell process (i.e.,
`std::env::current_dir`). Related to #12975 and #12976.
Note that this PR uses several declarative macros, as the file / this PR
would otherwise be 5000 lines long.
# User-Facing Changes
No major changes yet, just adds types to `nu-path` to be used in the
future.
# After Submitting
Actually use the new path types in all our crates where it makes sense,
removing usages of `std::path` types.
