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Add so-long library · emacs-mirror/emacs@4ac905f · GitHub
source link: https://github.com/emacs-mirror/emacs/commit/4ac905f88f10439ca0795b217a046e3a62895fc4
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Add so-long library · emacs-mirror/emacs@4ac905f · GitHubPermalink
Add so-long library
* lisp/so-long.el: New library. * doc/emacs/trouble.texi (Long Lines): New node covering so-long.el. * doc/emacs/emacs.texi (Top): Add menu entry for the Long Lines node. * etc/NEWS: Include under "New Modes and Packages in Emacs 27.1"
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| @@ -1176,6 +1176,7 @@ Dealing with Emacs Trouble | ||
| * Crashing:: What Emacs does when it crashes. | ||
| * After a Crash:: Recovering editing in an Emacs session that crashed. | ||
| * Emergency Escape:: What to do if Emacs stops responding. | ||
| * Long Lines:: Mitigating slowness due to extremely long lines. | ||
| Reporting Bugs | ||
| @@ -152,6 +152,7 @@ Emacs. | ||
| * Crashing:: What Emacs does when it crashes. | ||
| * After a Crash:: Recovering editing in an Emacs session that crashed. | ||
| * Emergency Escape:: What to do if Emacs stops responding. | ||
| * Long Lines:: Mitigating slowness due to extremely long lines. | ||
| @end menu | ||
| @node DEL Does Not Delete | ||
| @@ -457,6 +458,30 @@ program. | ||
| emergency escape---but there are cases where it won't work, when a | ||
| system call hangs or when Emacs is stuck in a tight loop in C code. | ||
| @node Long Lines | ||
| @subsection Long Lines | ||
| @cindex long lines | ||
| For a variety of reasons (some of which are fundamental to the Emacs | ||
| redisplay code and the complex range of possibilities it handles; | ||
| others of which are due to modes and features which do not scale well | ||
| in unusual circumstances), Emacs can perform poorly when extremely | ||
| long lines are present (where ``extremely long'' usually means at | ||
| least many thousands of characters). | ||
| A particular problem is that Emacs may ``hang'' for a long time at | ||
| the point of visiting a file with extremely long lines, and this case | ||
| can be mitigated by enabling the @file{so-long} library, which detects | ||
| when a visited file contains abnormally long lines, and takes steps to | ||
| disable features which are liable to cause slowness in that situation. | ||
| This library can also significantly improve performance when moving | ||
| and editing in such a buffer -- performance is still likely to degrade | ||
| as you get deeper into the long lines, but the improvements can | ||
| nevertheless be substantial. | ||
| Use @kbd{M-x so-long-commentary} to view the documentation for this | ||
| library and learn how to enable and configure it. | ||
| @node Bugs | ||
| @section Reporting Bugs | ||
| @@ -1705,6 +1705,14 @@ expansion to backtrace buffers produced by the Lisp debugger, Edebug | ||
| and ERT. See the node "(elisp) Backtraces" in the Elisp manual for | ||
| documentation of the new mode and its commands. | ||
| +++ | ||
| ** so-long.el helps to mitigate performance problems with long lines. | ||
| When 'global-so-long-mode' has been enabled, visiting a file with very | ||
| long lines will (subject to configuration) cause the user's preferred | ||
| 'so-long-action' to be automatically invoked (by default, the buffer's | ||
| major mode is replaced by 'so-long-mode'). In extreme cases this can | ||
| prevent delays of several minutes, and make Emacs responsive almost | ||
| immediately. Type 'M-x so-long-commentary' for full documentation. | ||
| * Incompatible Lisp Changes in Emacs 27.1 | ||
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