Package: emacs;
Reported by: Keith David Bershatsky <esq <at> lawlist.com>
Date: Tue, 19 Jan 2016 05:50:01 UTC
Severity: wishlist
Found in version 25.1.50
Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
From: Keith David Bershatsky <esq <at> lawlist.com> To: bug-gnu-emacs <at> gnu.org Subject: 25.1.50; Forcing `window-scroll-functions` to run. Date: Mon, 18 Jan 2016 21:49:40 -0800
As a feature request, please consider adding an alternative method to force the `window-scroll-functions` hook to run -- but NOT more than it would normally run. [In other words, it shouldn't run 3 times.] I only found `(set-window-buffer (selected-window) (current-buffer))` as a viable means to achieve this goal. `run-window-scroll-functions` runs immediately and is not a viable substitute for this feature request. Some users may not wish to `set-window-buffer` or run the `window-configuration-change-hook` to achieve this feature request. In my particular use case, I want to run a custom function only one time per command loop that is dependent upon the new `window-start` and `window-end`, which is only reliably available to the user after the `post-command-hook` has run its course. My function is too costly time-wise to run more than once each command loop. I have tried, to no avail, to come up with a test to ascertain with 100% accuracy (from the `post-command-hook`) to guess whether the `window-scroll-functions` hook will run and/or whether it will run more than one time (e.g., when cursor/point is partially visible). I played around with `(pos-visible-in-window-p nil nil t)` and whether it returned a length of 0, 2 or 6 -- however, from the `post-command-hook`, that is insufficient to ascertain with 100% accuracy whether the `window-scroll-functions` hook will run once or twice or not at all. The solution, I believe, is to force the `window-scroll-functions` hook to run during every redisplay -- but not more than it would normally run. In other words, I want the `window-scroll-functions` hook to run every command loop when my custom minor-mode is active -- or twice if point/cursor is only partially visible (at the bottom of the window) and needs to be moved up a smidgen by redisplay. Background: my custom function is a cross-hairs created with overlays that works with `word-wrap` -- the vertical line is XPM that matches the character and color underneath. Thanks, Keith ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; In GNU Emacs 25.1.50.1 (x86_64-apple-darwin10.8.0, NS appkit-1038.36 Version 10.6.8 (Build 10K549)) of 2016-01-03 built on server.local Repository revision: e94b1799d4f4c57266bdbc4801b26fe0121b7c7a Windowing system distributor 'Apple', version 10.3.1038 Configured using: 'configure --with-ns --without-imagemagick --enable-checking=glyphs CPPFLAGS=-I/Users/HOME/.0.data/.0.emacs/macports/include LDFLAGS=-L/Users/HOME/.0.data/.0.emacs/macports/lib' Configured features: JPEG RSVG DBUS NOTIFY ACL LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS Important settings: locale-coding-system: utf-8-unix Major mode: Grep Minor modes in effect: tabbar-mode: t sb-mode: t ml-mode: t hl-mode: t kb-mode: t sd-mode: t fl-mode: t bc-mode: t buffer-read-only: t Recent messages: Load-path shadows: None found. 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