问题
Is there an equivalent to the fill-column variable for the "Wrap" mode (visual-line-mode) in Emacs? If not, how could I set a limit on the length of visual lines when the window/frame of the buffer is wider ?
回答1:
In response to this question I created a minor mode called window-margin that accomplishes what @Stefan suggested in his answer.
Turn on window-margin-mode with:
(add-hook 'text-mode-hook 'turn-on-window-margin-mode)
The way you can still do it without installing window-margin is to use the longlines-mode that ships with Emacs, but is being phased out since there are some problems with longlines-mode, but here's the old way to do it if you want:
Turn on longlines-mode with something like:
(add-hook 'text-mode-hook 'longlines-mode)
which wraps text at the fill-column.
回答2:
longlines-mode is being phased out. For visual-line-mode, the simplest way is to make the window as narrow as you want it to be be. You can do that with C-x 2 and then adjusting the size of the window. Or you can set a wide margin or wide fringes.
来源：https://stackoverflow.com/questions/14009223/set-column-width-for-visual-lines-in-emacs