Variable: completion-at-point-functions

completion-at-point-functions is a buffer-local variable defined in minibuffer.el.gz.

Documentation

Special hook to find the completion table for the entity at point.

Each function on this hook is called in turn without any argument and should return either nil, meaning it is not applicable at point, or a function of no arguments to perform completion (discouraged), or a list of the form (START END COLLECTION . PROPS), where:
 START and END delimit the entity to complete and should include point,
 COLLECTION is the completion table to use to complete the entity, and
 PROPS is a property list for additional information.
Currently supported properties are all the properties that can appear in completion-extra-properties plus:
 :predicate a predicate that completion candidates need to satisfy.
 :exclusive value of no means that if the completion table fails to
   match the text at point, then instead of reporting a completion
   failure, the completion should try the next completion function.
As is the case with most hooks, the functions are responsible for preserving things like point and current buffer.

NOTE: These functions should be cheap to run since they're sometimes run from post-command-hook; and they should ideally only choose which kind of completion table to use, and not pre-filter it based on the current text between START and END (e.g., they should not obey completion-styles).

View in manual

Probably introduced at or before Emacs version 24.1.

Source Code

;; Defined in /usr/src/emacs/lisp/minibuffer.el.gz
(defvar completion-at-point-functions '(tags-completion-at-point-function)
  "Special hook to find the completion table for the entity at point.
Each function on this hook is called in turn without any argument and
should return either nil, meaning it is not applicable at point,
or a function of no arguments to perform completion (discouraged),
or a list of the form (START END COLLECTION . PROPS), where:
 START and END delimit the entity to complete and should include point,
 COLLECTION is the completion table to use to complete the entity, and
 PROPS is a property list for additional information.
Currently supported properties are all the properties that can appear in
`completion-extra-properties' plus:
 `:predicate'	a predicate that completion candidates need to satisfy.
 `:exclusive'	value of `no' means that if the completion table fails to
   match the text at point, then instead of reporting a completion
   failure, the completion should try the next completion function.
As is the case with most hooks, the functions are responsible for
preserving things like point and current buffer.

NOTE: These functions should be cheap to run since they're sometimes
run from `post-command-hook'; and they should ideally only choose
which kind of completion table to use, and not pre-filter it based
on the current text between START and END (e.g., they should not
obey `completion-styles').")