(forms-read-file-filter): new hook function to
preprocess file contents before being passed to forms mode. (forms-write-file-filter): new hook function to preprocess file contents before it is being saved to disk. Can be used to undo the effects of `forms-read-file-filter'. (forms-mode): Supply a default format if no `forms-format-list' was specified. Preprocess file contents using `forms-read-file-filter' and attach `forms-write-file-filter' to the `local-write-file-hooks' of the file buffer. Present a friendly message if the visited file is empty or new. (forms--intuit-from-file): New subroutine to get the number of fields from the data file; constructs a default format list. (forms-save-buffer): Forms mode wrapper for `save-buffer'. (forms--change-commands, forms--exit): Use it. (forms--update): Check for the presence of the field separator in any of the fields. Refuse update if found. (forms-delete-record): Allow the last record of the file to be deleted, even if not terminated by a newline. (forms--local-write-file-function): Remove. Didn't do any good. Replaced by `forms-save-buffer'.
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