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| From: | Ergus |
| Subject: | Re: Question collaborative editing. |
| Date: | Wed, 30 Sep 2020 15:19:31 +0200 |
On Wed, Sep 30, 2020 at 02:40:26AM -0500, Karl Fogel wrote:
On 30 Sep 2020, Ergus wrote:I would be concerned about the performance (but I am paranoid about Emacs performance anyway so don't worry for that). AFAIR emacs buffers are stored in a contiguous way (I may be wrong)Information about how Emacs buffers are represented under the hood can be found here: * https://git.savannah.gnu.org/cgit/emacs.git/tree/src/buffer.h#n213 * https://www.gnu.org/software/emacs/manual/html_node/elisp/Buffer-Gap.html
This is interesting indeed. I was looking at this to compare what's around: https://ecc-comp.blogspot.com/2015/05/a-brief-glance-at-how-5-text-editors.html
TL;DR: It's a contiguous array with a gap at the point where insertion or deletion happens. When you need to insert or delete somewhere else, Emacs first moves the gap to the new location. The gap is exposed to Elisp via the functions `gap-position' and `gap-size', though I must confess I've never used them from Elisp. Best regards, -Karl
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