How do I combine the bind and print commands?

[NimanthaData]

My goal is to use the v key to change the r_voxels CVAR and also display that changed value (Auto, On, Off) as a player message.

I have tried to do this by combining two commands that work independently:

The first binds the v key to toggle r_voxels (controls the CVAR r_voxels)

bind v "toggle r_voxels"

It changes the r_voxels value (as seen on screen as well as in the console - but no player message):

The second will print the text Voxels is set to: along with the CVAR r_voxels on the console (and as a player message):

if r_voxels is on then print "Voxels is set to: " r_voxels else print "Voxels is set to: " r_voxels

I tried to combine them using a semi colon and AND

bind v "toggle r_voxels"; if r_voxels is on then print "Voxels is set to: " r_voxels else print "Voxels is set to: " r_voxels

as a join but faced a couple of issues:

• It's too long - I can't seem to enter the full text
• Seems to be invalid, but - No error shown when when key bound to invalid action

Notes

Originally added as a follow up question:
Extending Print CCMD to accept toggle CCMD (e.g. toggle r_voxels)

[XNinety9]

You can do it in one bind: the quotes have to go around the whole list of commands, not just the first one. Since print needs its own double quotes, use single quotes on the outside:

bind v 'toggle r_voxels; print "Voxels is set to: " r_voxels'

How that's parsed, from c_cmds.c / c_console.c:

• bind takes everything after the control as the action and strips one pair of outer quotes, "…" or '…' (M_StripQuotes). If the action isn't wrapped in quotes, it's rejected as an invalid action. That's what happened with bind v "toggle r_voxels"; if …: the quotes close after toggle r_voxels, so the whole line doesn't start and end with a quote.
• When you press the key, the bound string is split on ; and each command runs in turn (C_ExecuteInputString). The inner "Voxels is set to: " stays intact for print, which prints quoted text as-is and replaces a bare CVAR name with its current value.
• The if … else isn't needed, since both branches print the same thing.

Keep the whole action under 127 characters (bind reads at most that much). This one is ~60. When Doom Retro saves the bind to doomretro.cfg, it writes it with outer double quotes, which reloads fine because only the outer pair is stripped.

I haven't run this in the game, it's from reading the source.