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Most of the file names used in Lisp programs are entered by the user. But
occasionally a Lisp program needs to specify a standard file name for a
particular use—typically, to hold customization information about each
user. For example, abbrev definitions are stored (by default) in the file
‘~/.abbrev_defs’; the completion package stores completions in
the file ‘~/.completions’. These are two of the many standard file
names used by parts of Emacs for certain purposes.
Various operating systems have their own conventions for valid file names
and for which file names to use for user profile data. A Lisp program which
reads a file using a standard file name ought to use, on each type of
system, a file name suitable for that system. The function
convert-standard-filename makes this easy to do.
This function alters the file name filename to fit the conventions of the operating system in use, and returns the result as a new string.
The recommended way to specify a standard file name in a Lisp program is to
choose a name which fits the conventions of GNU and Unix systems, usually
with a nondirectory part that starts with a period, and pass it to
convert-standard-filename instead of using it directly. Here is an
example from the completion package:
(defvar save-completions-file-name
(convert-standard-filename "~/.completions")
"*The file name to save completions to.")
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On GNU and Unix systems, and on some other systems as well,
convert-standard-filename returns its argument unchanged. On some
other systems, it alters the name to fit the system's conventions.
For example, on MS-DOS the alterations made by this function include converting a leading ‘.’ to ‘_’, converting a ‘_’ in the middle of the name to ‘.’ if there is no other ‘.’, inserting a ‘.’ after eight characters if there is none, and truncating to three characters after the ‘.’. (It makes other changes as well.) Thus, ‘.abbrev_defs’ becomes ‘_abbrev.def’, and ‘.completions’ becomes ‘_complet.ion’.
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Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.