(emacs)Completion


Completion
==========

   For certain kinds of arguments, you can use "completion" to enter
the argument value.  Completion means that you type part of the
argument, then Emacs visibly fills in the rest, or as much as can be
determined from the part you have typed.

   When completion is available, certain keys--<TAB>, <RET>, and
<SPC>--are rebound to complete the text present in the minibuffer into
a longer string that it stands for, by matching it against a set of
"completion alternatives" provided by the command reading the argument.
`?' is defined to display a list of possible completions of what you
have inserted.

   For example, when `M-x' uses the minibuffer to read the name of a
command, it provides a list of all available Emacs command names to
complete against.  The completion keys match the text in the minibuffer
against all the command names, find any additional name characters
implied by the ones already present in the minibuffer, and add those
characters to the ones you have given.  This is what makes it possible
to type `M-x ins <SPC> b <RET>' instead of `M-x insert-buffer <RET>'
(for example).

   Case is normally significant in completion, because it is significant
in most of the names that you can complete (buffer names, file names and
command names).  Thus, `fo' does not complete to `Foo'.  Completion
does ignore case distinctions for certain arguments in which case does
not matter.

Example: Completion Example.
Commands: Completion Commands.
Strict Completion
Options: Completion Options.

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