Allows easy use of Windows environment variables from within Windows subsystem for Linux (using fish shell.) Automatically translates variables that look like Windows paths to WSL paths.

winenv.fish

function winenv --description "Echos windows environment variables from WSL."
    for arg in $argv
        set result (cmd.exe /c echo "%"$arg"%" | string trim)
        if echo $result | grep -i "^[a-z]:\\\\" > /dev/null
           for r in (echo $result|string split ";")
              echo (wslpath $r)
           end
        else
            echo $result
        end
    end
end

This function allows easier use of Windows environment variables from the fish shell in WSL. Examples:

> winenv USERNAME
MyWindowsUser

> winenv TEMP
/mnt/c/Users/MyWindowsUser/AppData/Local/Temp

> winenv LOCALAPPDATA
/mnt/c/Users/MyWindowsUser/AppData/Local

> winenv PATH
/mnt/c/ProgramData/Oracle/Java/javapath
/mnt/c/Windows/System32
/mnt/c/Windows
/mnt/c/Windows/System32/wbem
/mnt/c/Windows/System32/WindowsPowerShell/v1.0
/mnt/c/Program Files/Git/cmd
/mnt/c/Program Files (x86)/NVIDIA Corporation/PhysX/Common
/mnt/c/Windows/System32
/mnt/c/Windows
/mnt/c/Windows/System32/wbem
/mnt/c/Windows/System32/WindowsPowerShell/v1.0
/mnt/c/Windows/System32/OpenSSH
/mnt/c/Users/MyWindowsUser/AppData/Local/Programs/Python/Python36-32/Scripts
/mnt/c/Users/MyWindowsUser/AppData/Local/Programs/Python/Python36-32
/mnt/c/Users/MyWindowsUser/AppData/Local/Microsoft/WindowsApps
/mnt/c/Users/MyWindowsUser/wsl-terminal

> winenv HOMEDRIVE HOMEPATH
C:
\Users\MyWindowsUser

> winenv HOMEDRIVE HOMEPATH | string join ""
C:\Users\MyWindowsUser

> wslpath (winenv HOMEDRIVE HOMEPATH | string join "")
/mnt/c/Users/MyWindowsUser