No support for more general completion rules?

[kbauer]

I was trying to add support for the \csname NAME\endcsname construct, and obtain an invalid expansion.

To reproduce

• Create a new TeX file.
• Evaluate (TeX-add-symbols '("csname" (TeX-arg-literal " ") (TeX-arg-free "macroname") (TeX-arg-literal "\endcsname"))) in that buffer.
• Enter C-c RET csname RET somemacro RET to insert \csname somemacro\endcsname.

Expected behavior

Typing \csnam RET should expand to \csname macroname\endcsname, with macroname as a snippet placeholder.

Actual behavior

Instead it expands to \csname{}{}{}.

As far as I can tell from the company-auctex-arg-lookup-table, the package may currently lack the infrastructure code for supporting TeX-arg-free and TeX-arg-literal directly.

[alexeyr]

My answer for the moment is going to be "I agree this would be good to fix, pull requests (or forks) welcome". Same for #30.