fix(fish)!: don't resolve symlinks for ASDF_DIR

[MageJohn]

Summary

In the fish entry point, only make the ASDF_DIR path absolute, and don't resolve symlinks.

Other Information

Without this change, a brew upgrade causes all the shims to be broken.

When asdf is installed by homebrew, it is placed in a versioned directory and then symlinked to /usr/local/opt/asdf. If the symlink is resolved, ASDF_DIR contains the versioned directory. This is a problem because shims use the value of ASDF_DIR to get an absolute path to the asdf executable.

Not resolving symlinks is in line with the asdf.sh entry point.

[danhper]

Thanks! Looks good to me!

[evanleck]

I'm not sure if this patch caused it but after upgrading I keep getting this output in my shell (fish):

realpath: illegal option -- -
usage: realpath [-q] [path ...]

[MageJohn]

@evanleck I think your right, this probably is the culprit. It looks like, despite there being a fish builtin realpath command that supports the --no-symlinks flag, it first uses the system realpath. If that doesn't support the flag (which is the case on Mac), then there's a problem. I'll open a PR to fix this.

[evanleck]

@MageJohn thank you 🙏