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8.7 Last Resorts

When Scheme exits abnormally it tries to save any unsaved Edwin buffers. The buffers are saved in an auto-save file in case the original is more valuable than the unsaved version. You can use the editor command M-x recover-file to recover the auto-saved version. The name used to specify an auto-save file is operating-system dependent: under unix, and on PC file systems with long file names, foo.scm will be saved as #foo.scm#; on PC file systems with short file names, it will be saved as foo.sav.

The following Scheme procedures are useful for recovering from bugs in Edwin's implementation. All of them are designed for use when Edwin is not running—they should not be used when Edwin is running. These procedures are designed to help Edwin's implementors deal with bugs during the implementation of the editor; they are not intended for casual use, but as a means of recovering from bugs that would otherwise require reloading the editor's world image from the disk.

— procedure: save-editor-files

Examines Edwin, offering to save any unsaved buffers. This is useful if some bug caused Edwin to die while there were unsaved buffers, and you want to save the information without restarting the editor.

— procedure: reset-editor

Resets Edwin, causing it to be reinitialized the next time that edit is called. If you encounter a fatal bug in Edwin, a good way to recover is to first call save-editor-files, and then to call reset-editor. That should completely reset the editor to its initial state.

— procedure: reset-editor-windows

Resets Edwin's display structures, without affecting any of the buffers or their contents. This is useful if a bug in the display code causes Edwin's internal display data structures to get into an inconsistent state that prevents Edwin from running.