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I want to be able to execute a command in ESS to quickly add a horizontal line (using dashes) out to column 80.

This will be used for header comments. I'd like to be able to re-execute the command to redraw the line if I change the header comment as edits will change the end point of the line from column 80. E.g. 

## Title here -------------------------

## Edited title here -------------------------

If I execute the command on the second one, it'll shorten it to the same length as the first (imagining that it ends at column 80).

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  • check out comment-box (or is it box-comment?) for a way of doing something similar. If you don't like that, you could do exactly what you want with a few lines of elisp – Tyler Aug 17 '18 at 0:36
  • Thanks for pointing me in this direction. Yes, it's comment-box. But that led me onto rebox2, which is more customizable and super functional. – jdtonkin Aug 17 '18 at 4:59
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Thanks to Tyler's comment above, I found rebox2. This enables easily adding comment boxes and changing them as you go, which is bound to M-q.

This doesn't do exactly as I asked, but it is very customizable and does the trick nicely for headings inside ESS. e.g.:

## ---------- ##    
## Title here ##
## ---------- ##
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