add uutils/coreutils mkdir command into nushell

[KAAtheWiseGit]

Related problem

Part of the porting of uutils to Nushell.

Describe the solution you'd like

Port uutils' mkdir as umkidr.

[KAAtheWiseGit]

uutils' mkdir has two functions. The first is exec. It takes an iterator with OsString's and creates those directories. The other is mkdir, which takes a Path and creates just one directory. Both of them have the same options. The difference is that exec accounts for this:

        // Special case to match GNU's behavior:
        // mkdir -p foo/. should work and just create foo/
        // std::fs::create_dir("foo/."); fails in pure Rust

Would it be better for Nushell to use mkdir-only here?

[KAAtheWiseGit]

@uutils' mkdir changes got released yesterday, so I'll start making a PR this week.

[KAAtheWiseGit]

Is there a consensus on the --parents flag? Should it be enabled by default as with Nushell's mkdir?

[amtoine]

Is there a consensus on the --parents flag? Should it be enabled by default as with Nushell's mkdir?

maybe we can start by keeping the same behaviour as now?
that should be fairly easy to switch the default value, right? 😋

[KAAtheWiseGit]

I just found out both uu_cp and uu_mkdir depend on clap. I think this is a problem.

[KAAtheWiseGit]

Made a umkdir draft PR #10785.