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On MS-DOS and Microsoft Windows, Emacs guesses the appropriate end-of-line conversion for a file by looking at the file's name. This feature classifies files as text files and binary files. By “binary file” we mean a file of literal byte values that are not necessarily meant to be characters; Emacs does no end-of-line conversion and no character code conversion for them. On the other hand, the bytes in a text file are intended to represent characters; when you create a new file whose name implies that it is a text file, Emacs uses DOS end-of-line conversion.
This variable, automatically buffer-local in each buffer, records the file
type of the buffer's visited file. When a buffer does not specify a coding
system with buffer-file-coding-system, this variable is used to
determine which coding system to use when writing the contents of the
buffer. It should be nil for text, t for binary. If it is
t, the coding system is no-conversion. Otherwise,
undecided-dos is used.
Normally this variable is set by visiting a file; it is set to nil if
the file was visited without any actual conversion.
This variable holds an alist for recognizing text and binary files. Each
element has the form (regexp . type), where regexp is
matched against the file name, and type may be nil for text,
t for binary, or a function to call to compute which. If it is a
function, then it is called with a single argument (the file name) and
should return t or nil.
When running on MS-DOS or MS-Windows, Emacs checks this alist to decide
which coding system to use when reading a file. For a text file,
undecided-dos is used. For a binary file, no-conversion is
used.
If no element in this alist matches a given file name, then
default-buffer-file-type says how to treat the file.
This variable says how to handle files for which
file-name-buffer-file-type-alist says nothing about the type.
If this variable is non-nil, then these files are treated as binary:
the coding system no-conversion is used. Otherwise, nothing special
is done for them—the coding system is deduced solely from the file
contents, in the usual Emacs fashion.
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Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.