Re: Display-based word wrapping

[Lennart Borgman (gmail)]

Chong Yidong wrote:
> I have been studying Kim Storm's display-based word wrapping code.  I
> believe it's pretty safe, and suitable for inclusion into the Emacs 23
> release (probably turned off by default).
>
> The original patch included a `wrap-column' variable, but I'd like to
> modify this to use `truncate-lines' instead, as shown below.  This would
> mean that word wrap always uses the right window edge as a wrap column.
> Any objections?

Yes, I would find this quite impractical to not have a `wrap-column'. I 
do not want to resize windows just to edit text in a comfortable way. 
(Wouldn't it also make it impossible to use the "darkroom" editing some 
people have suggested?)

Is there any reason not to have a wrap-column? If that is nil I would 
suggest falling back to the window edge.

> truncate-lines is a variable defined in `C source code'.
>
> Documentation:
> Whether lines longer than the window width are truncated.
> If the value is nil or `word-wrap', long lines are displayed using
> continuation lines.  If nil, the wrapping occurs at the right window
> edge.  If `word-wrap', it occurs at the rightmost space or tab
> character, if possible.
>
> Any other non-nil value means to give each line of text just one
> screen line, truncating long lines at the right window edge.
>
> Note that this is overridden by the variable
> `truncate-partial-width-windows' if that variable is non-nil
> and this buffer is not full-frame width.