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When completion is done on file names, certain file names are usually
ignored. The variable completion-ignored-extensions contains a
list of strings; a file whose name ends in any of those strings is
ignored as a possible completion. The standard value of this variable
has several elements including ".o", ".elc", ".dvi"
and "~". The effect is that, for example, `foo' can
complete to `foo.c' even though `foo.o' exists as well.
However, if all the possible completions end in "ignored"
strings, then they are not ignored. Ignored extensions do not apply to
lists of completions--those always mention all possible completions.
Normally, a completion command that cannot determine even one
additional character automatically displays a list of all possible
completions. If the variable completion-auto-help is set to
nil, this automatic display is disabled, so you must type
? to display the list of completions.
Partial Completion mode implements a more powerful kind of
completion that can complete multiple words in parallel. For example,
it can complete the command name abbreviation p-b into
print-buffer, because no other command starts with two words
whose initials are `p' and `b'.
Partial completion of directories in file names uses `*' to indicate the places for completion; thus, `/u*/b*/f*' might complete to `/usr/bin/foo'.
To enable this mode, use the command M-x
partial-completion-mode, or customize the option
partial-completion-mode. This binds the partial completion
commands to TAB, SPC, RET, and ?. The usual
completion commands are available on M-TAB,
M-SPC, M-RET and M-?.
Another feature of Partial Completion mode is to extend
find-file so that the `<include>' stands for the
file named include in some directory in the path
PC-include-file-path. If you set PC-disable-includes to
non-nil, this feature is disabled.
Icomplete mode presents a constantly-updated display that tells you what completions are available for the text you've entered so far. The command to enable or disable this minor mode is M-x icomplete-mode.
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