`Splash(DotDigraph(D))` doesn't work on windows

[samanthaharper]

gap> D := RandomDigraph(5);
<immutable digraph with 5 vertices, 25 edges>
gap> Splash(DotDigraph(D));
Error, none of the default viewers [ "xpdf", "xdg-open", "open", "evince", "okular", "gv" ] is available, please specify an available viewer in the options record component `viewer`, at /home/samharper/gap-4.11.0/pkg/Digraphs/gap/display.gi:154 called from
<function "Splash">( <arguments> )
 called from read-eval loop at *stdin*:2
type 'quit;' to quit to outer loop
brk> quit;

[olexandr-konovalov]

If you would like to see it, and can't do this on Windows, you can try it online using Jupyter notebooks running on Binder: see https://github.com/gap-system/try-gap-in-jupyter. For example:

Please be aware that Binder sessions are not persistent, you will have to download results of your calculations and/or images to save them locally.

[james-d-mitchell]

Great suggestion @alex-konovalov! You don't happen to know what the "correct" viewer name would be for the windows subsystem for linux, do you? Perhaps @ChrisJefferson knows?

[ChrisJefferson]

So, I'm not aware of a nice single command to do this I'm afraid, as it requires running two command (one to turn the path into a windows path, and a second to then "run" the resulting program).

I use the following tiny shell script, which I call wopen:

#!/usr/bin/env bash

winname=$(wslpath -w "$*")
cmd.exe /C start "$winname"

If you put this somewhere on your path (like as /usr/local/bin/wopen or some such), then using wopen as the viewer works.

[github-actions]

Stale issue message

[wilfwilson]

So, I'm not aware of a nice single command to do this I'm afraid, as it requires running two command (one to turn the path into a windows path, and a second to then "run" the resulting program).

I use the following tiny shell script, which I call wopen:

#!/usr/bin/env bash

winname=$(wslpath -w "$*")
cmd.exe /C start "$winname"

If you put this somewhere on your path (like as /usr/local/bin/wopen or some such), then using wopen as the viewer works.

I don't know anything about compilation, or Windows, but would it be possible/reasonable to create such a shell script, and install it somewhere in the PATH, when compiling the Digraphs package on Windows? Since Digraphs has to be compiled to be used, it gives an opportunity to mess around in this kind of way with the user's system.

[wilfwilson]

I realised that this issue is probably more appropriate for the up-and-coming graphviz package!