[Therion] New development software issue

[Olly Betts]

On Thu, Dec 12, 2019 at 09:46:08PM +0000, Tarquin Wilton-Jones via Therion wrote:
> ERROR: Can not execute "command.com /c "C:\\Program
> Files\\Therion\\therion.exe" -x cave.th
> 
> (I managed to find an old thread with this same message, but there was
> no fix in that thread.)
> 
> However, the build from commit 802ad7c works correctly. Looks like
> commit 19eb624 has a regression that prevents it from running on Windows
> 10 at least (tested on Windows 10 Home only - I don't want to nuke my
> working Pro version, so please don't ask me to test there ;) ).
> 
> There is no "command.com" on Windows 10...

The code in xtherion/global.tcl tries to run cmd.exe first and if that
fails it assumes command.com:

    if {[catch {
      set fid [open "|cmd.exe /c" r]
      read $fid;
      close $fid
    }]} {
      set xth(gui,compcmd) "command.com /c $xth(gui,compcmd)"
    } else {
      set xth(gui,compcmd) "cmd.exe /c $xth(gui,compcmd)"
    }

This code hasn't changes for ages.  Perhaps it should just assume cmd.exe
these days, but for now I'd try to work out when cmd.exe /c fails on
your machine.

Cheers,
    Olly