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7.3.3.6 write-file-functions—a hook

Variable: write-file-functions ¶

This variable a list of functions to be called before writing out a buffer to its visited file. If one of them returns non-‘nil’, the file is considered already written and the rest of the functions are not called, nor is the usual code for writing the file executed. In addition, if a function in write-file-functions returns non-‘nil’, it is responsible for making a backup file, using the following code:

(or buffer-backed-up (backup-buffer))

Even though this is not a normal hook, you can use ‘add-hook’ and ‘remove-hook’ to manipulate the list.