Include directory flag -d in Help dialog

[bschatzmbo]

Description of the new feature

1. Include "-d PATH Specify directory to start in" in the Help dialog
2. (optional) If [SUBCOMMAND] is a path, treat that as a directory argument to start the terminal in

Backstory:
I wanted to create a terminal window from a different cli window (VSCode in this case) starting in the same path. The help dialog did not list anything close to what I wanted, so I had to ask Google (the shame). I often launch gui tools from cli with parameters relative to my present working directory.

Proposed technical implementation details

At minimum, add the text "-d PATH Specify directory to start in" in the Help dialog somewhere in the Options section.

For the optional part:
Currently returns "[error 2147942405 (0x80070005) when launching `.']" and an otherwise stuck window.
Instead: perform a type check on the object at the path. If it's a directory, treat like a parameter to "-d" and open a window at that path. Otherwise, maintain existing behavior.
Not sure the difficulty of adding an object type check when a Subcommand is passed as a parameter. In the short term, I'm writing a PowerShell shim wt.ps1 that I'll place higher in my PATH.

[zadjii-msft]

Actually yknow what. I'll merge a Teams thread:

Checking if the commandline parameter is a directory, and treating that as the -d arg (when -d isn't otherwise specified) honestly isn't a bad idea.

Likewt c:\windows - well, that's not an executable commandline. We can't use that as the commandline. But we actually can use it like wt -d c:\windows.

and if it is wt -d d:\dev c:\windows well, we shouldn't promote c:\windows to be the startingDirectory.

wt . is just more convenient, and lots of folks have asked for that in the past. There's prior art with code . too.

Reciepts:

Other x-links:

• Polish Commandline Help MessageBox to be at least like, but at best better than, msiexec /? #4134
• the cli parameter -d is not shown in help #9585 - objectively, this is a dupe and I'll move discussion there meh, I guess it's thematically the same, but different.

I'll use this thread for specifically tracking "use the commandline as the startingDirectory if it's a directory"