How to elegantly create a Windows shortcut that starts a WSL program under X - windows

Question

I'm struggling a little to launch xfce4-terminal from my WSL installation under VcXsrv from a button on the Windows taskbar. I don't want any DOS box/console/terminal other than the xfce4-terminal when I'm done. I have it working, but man is it ugly. Does anybody have a cleaner way of doing this?
Here is what I got working: I created a windows shortcut on the Desktop with this target (all in one line, broken with newlines for readability here):
C:\Windows\System32\wscript.exe
\\wsl$\Ubuntu-20.04\home\peter\bin\windows\startTerminal.vbs
startTerminal.vbs was inspired by from 10 Ways To Run Batch Files Silently And Hide The Console Window • Raymond.CC (one of the few solutions that didn't require installing a separate program for this!) and it contains:
CreateObject("Wscript.Shell").Run "C:\Windows\System32\wsl.exe -u peter --exec /home/peter/bin/windows/startTerminal.sh",0,True
and startTerminal.sh contains:
export DISPLAY=localhost:0.0
xfce4-terminal --command=/bin/zsh
Setting DISPLAY is apparently required, even though I set the DISPLAY environment in ~/.zshrc. wsl.exe apparently doesn't do that unless you run the login shell.
Once all of this is working, I can drag my shortcut to the taskbar and click on it there.
I count 3, three files cooperating to achieve this simple goal? Can I limit that to one or two without installing an external program?

Answer 1

Yes, I think you can do what I do in one shortcut file. I'll share what works for me then you'll have to fiddle for your program.
Try putting all your commands in the Target section of the Shortcut link file.
Step 1. Right click on desktop then New then Shortcut then name it (LaunchXFCE4)
Step 2. Right click LaunchXFCE4 select Properties
Step 3. Enter all your launch sequences in the Target section
Step 4. Right click LaunchXFCE4 select Pin to Taskbar
I'm launching Emacs 27.1 on WSL 2 with Ubuntu 20.10 on Windows 10 using this code which perhaps you can modify.
C:\Windows\System32\wsl.exe --distribution Ubuntu20 bash -c "export DISPLAY=$(ip route | awk '{print $3; exit}'):0 && export LIBGL_ALWAYS_INDIRECT=1 && export XCURSOR_SIZE=16 && setsid emacs"
The first export display is similar to your localhost:0.0 so replace it or try mine. Maybe your xfce4 replaces my emacs. Read this post about double ampersands. So possibly this
C:\Windows\System32\wsl.exe --distribution Ubuntu20 bash -c "export DISPLAY=localhost:0.0 && export LIBGL_ALWAYS_INDIRECT=1 && export XCURSOR_SIZE=16 && setsid xfce4-terminal --command=/bin/zsh"
Note, my VcXsrv starts when windows starts by putting a shortcut to config.xlaunch in my C:\Users\USERNAME\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup.
By the way, Microsoft will provide a GUI for WSL in a few months, according to their blog
GUI app support in WSL is becoming a reality! We are getting closer to
an initial preview and happy to announce a preview release for Windows
Insiders within the next couple of months.

Answer 2

I removed the need for a startTerminal.sh file by:
Editing startTerminal.vbs to contain:
CreateObject("Wscript.Shell").Run "C:\Windows\System32\wsl.exe -u peter bash -l -c xfce4-terminal",0,True
And then I created a ~/.bash_profile to set the $DISPLAY variable, which probably should've been done anyway:
$ cat .bash_profile
if [ -z "$DISPLAY" ]; then
export DISPLAY=:0
fi
So now there is the shortcut and a startTerminal.vbs that starts it up. It still isn't very elegant...

Answer 3

One of the few good additions to Windows was WSL-2, it's much more capable now.
It's part of late Win 10 and Win 11.
Here is how to elegently create a terminal window, replace the terminal with any X app you want.
Linux: "apt-get install xfce4-terminal" (or equivalent)
Windows: Create a new Shortcut (right click in any windows folder)
2.1) Shortcut to -> C:\Windows\System32\wslg.exe -u root -- /usr/bin/xfce4-terminal
If you have multiple distributions use it like: "-d Debian"
That's it. You can give it a better icon and name it.
It will launch the application as if it was a windows application.

Answer 4

After experimenting with #Saj 's answer which did not work for me I resulted in the below:
C:\Windows\System32\wsl.exe --distribution Ubuntu-20.04 bash -c "export DISPLAY=$((route.exe print | Select-String 0.0.0.0 | select -first 1) -Split "\s+" | select -Index 4):0.0 && export LIBGL_ALWAYS_INDIRECT=1 && setsid emacs"
Note that my problem was that it could not use bash commands inside the parenthesis (grep, awk)
Environment: WSL2 on Windows 10