Emacs-mode for IDL code formatting compatibility

[dschlapf]

So far, I'm still using the venerable Emacs IDL-PWWave mode for IDL programming. It has some very nice features in terms of formatting and it would be nice to see some of them in IDL for VSCode:

• commenting: single and double semicolons are treated differently for comments (double ones can be anywhere; single ones only in the beginning or halfway on a line) - this makes comments look nicer
• when pressing tab or return on a line, the line is indented automatically (only spaces are allowed as part of the code, no tabs)
• Alt-Return in the middle of a code line will automatically insert a line continuation ($ sign) and also split strings correctly on two lines.
• .. and there is a bunch of standard templates for faster programming

Would be great if some of that, or kind of an emacs-back-compatibiliy mode would be introduced. Currently, the IDL mode of VSCode is scrambling some code formatting from emacs-created code as a blank is inserted to within semicolons; making this 'insert blank' optional would already be quite useful.