--- /dev/null
+;;; code-files.el --- File I/O functions for XEmacs.
+
+;; Copyright (C) 1992,93,94,95 Free Software Foundation, Inc.
+;; Copyright (C) 1995 Amdahl Corporation.
+;; Copyright (C) 1995 Sun Microsystems.
+
+;; This file is part of XEmacs.
+
+;; XEmacs is free software; you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; XEmacs is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with XEmacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Synched up with: Not synched.
+
+;;; Commentary:
+
+;; Derived from mule.el in the original Mule but heavily modified
+;; by Ben Wing.
+
+;; 1997/3/11 modified by MORIOKA Tomohiko to sync with Emacs 20 API.
+
+;; This file was derived from the former mule-files.el which has been removed
+;; as of XEmacs 21.2.15.
+
+;;; Code:
+
+(setq-default buffer-file-coding-system 'raw-text)
+(put 'buffer-file-coding-system 'permanent-local t)
+
+(define-obsolete-variable-alias
+ 'file-coding-system
+ 'buffer-file-coding-system)
+
+(define-obsolete-variable-alias
+ 'overriding-file-coding-system
+ 'coding-system-for-read)
+
+(defvar buffer-file-coding-system-for-read 'undecided
+ "Coding system used when reading a file.
+This provides coarse-grained control; for finer-grained control, use
+`file-coding-system-alist'. From a Lisp program, if you wish to
+unilaterally specify the coding system used for one particular
+operation, you should bind the variable `coding-system-for-read'
+rather than setting this variable, which is intended to be used for
+global environment specification.")
+
+(define-obsolete-variable-alias
+ 'file-coding-system-for-read
+ 'buffer-file-coding-system-for-read)
+
+(defvar file-coding-system-alist
+ `(
+;; This must not be necessary, slb suggests -kkm
+;; ("loaddefs.el$" . (binary . binary))
+ ,@(mapcar
+ #'(lambda (regexp) (cons regexp 'binary)) binary-file-regexps)
+ ("TUTORIAL\\.\\(?:hr\\|pl\\|ro\\)\\'" . iso-8859-2)
+ ;; ("\\.\\(el\\|emacs\\|info\\(-[0-9]+\\)?\\|texi\\)$" . iso-2022-8)
+ ;; ("\\(ChangeLog\\|CHANGES-beta\\)$" . iso-2022-8)
+
+ ;; This idea is totally broken, and the code didn't work anyway.
+ ;; Mailboxes should be decoded by mail clients, who actually know
+ ;; how to deal with them. Otherwise, their contents should be
+ ;; treated as `binary'.
+ ;("/spool/mail/.*$" . convert-mbox-coding-system)
+ )
+ "Alist to decide a coding system to use for a file I/O operation.
+The format is ((PATTERN . VAL) ...),
+where PATTERN is a regular expression matching a file name,
+VAL is a coding system, a cons of coding systems, or a function symbol.
+If VAL is a coding system, it is used for both decoding and encoding
+the file contents.
+If VAL is a cons of coding systems, the car part is used for decoding,
+and the cdr part is used for encoding.
+If VAL is a function symbol, the function must return a coding system
+or a cons of coding systems which are used as above.
+
+This overrides the more general specification in
+`buffer-file-coding-system-for-read', but is overridden by
+`coding-system-for-read'.")
+
+(defun set-buffer-file-coding-system (coding-system &optional force)
+ "Set buffer-file-coding-system of the current buffer to CODING-SYSTEM.
+If optional argument FORCE (interactively, the prefix argument) is not
+given, attempt to match the EOL type of the new coding system to
+the current value of `buffer-file-coding-system'."
+ (interactive "zFile coding system: \nP")
+ (get-coding-system coding-system) ;; correctness check
+ (if (not force)
+ (setq coding-system
+ (subsidiary-coding-system
+ coding-system
+ (coding-system-eol-type buffer-file-coding-system))))
+ (setq buffer-file-coding-system coding-system)
+ (redraw-modeline t))
+
+(defun toggle-buffer-file-coding-system ()
+ "Set EOL type of buffer-file-coding-system of the current buffer to
+something other than what it is at the moment."
+ (interactive)
+ (let ((eol-type
+ (coding-system-eol-type buffer-file-coding-system)))
+ (setq buffer-file-coding-system
+ (subsidiary-coding-system
+ (coding-system-base buffer-file-coding-system)
+ (cond ((eq eol-type 'lf) 'crlf)
+ ((eq eol-type 'crlf) 'lf)
+ ((eq eol-type 'cr) 'lf))))
+ (set-buffer-modified-p t)))
+
+(define-obsolete-function-alias
+ 'set-file-coding-system
+ 'set-buffer-file-coding-system)
+
+(defun set-buffer-file-coding-system-for-read (coding-system)
+ "Set the coding system used when reading in a file.
+This is equivalent to setting the variable
+`buffer-file-coding-system-for-read'. You can also use
+`file-coding-system-alist' to specify the coding system for
+particular files."
+ (interactive "zFile coding system for read: ")
+ (get-coding-system coding-system) ;; correctness check
+ (setq buffer-file-coding-system-for-read coding-system))
+
+(define-obsolete-function-alias
+ 'set-file-coding-system-for-read
+ 'set-buffer-file-coding-system-for-read)
+
+(defun set-default-buffer-file-coding-system (coding-system)
+ "Set the default value of `buffer-file-coding-system' to CODING-SYSTEM.
+The default value is used both for buffers without associated files
+and for files with no apparent coding system (i.e. primarily ASCII).
+See `buffer-file-coding-system' for more information."
+ (interactive "zDefault file coding system: ")
+ (setq-default buffer-file-coding-system coding-system)
+ (redraw-modeline t))
+
+(define-obsolete-function-alias
+ 'set-default-file-coding-system
+ 'set-default-buffer-file-coding-system)
+
+(defun find-file-coding-system-for-read-from-filename (filename)
+ "Look up coding system to read a file in `file-coding-system-alist'.
+The return value will be nil (no applicable entry) or a coding system
+object (the entry specified a coding system)."
+ (let ((alist file-coding-system-alist)
+ (found nil)
+ (codesys nil))
+ (let ((case-fold-search nil))
+ (setq filename (file-name-sans-versions filename))
+ (while (and (not found) alist)
+ (if (string-match (car (car alist)) filename)
+ (setq codesys (cdr (car alist))
+ found t))
+ (setq alist (cdr alist))))
+ (when codesys
+ (if (functionp codesys)
+ (setq codesys (funcall codesys 'insert-file-contents filename))
+ )
+ (cond ((consp codesys) (find-coding-system (car codesys)))
+ ((find-coding-system codesys))
+ ))))
+
+(define-obsolete-function-alias
+ 'find-file-coding-system-from-filename
+ 'find-file-coding-system-for-read-from-filename)
+
+(defun find-file-coding-system-for-write-from-filename (filename)
+ "Look up coding system to write a file in `file-coding-system-alist'.
+The return value will be nil (no applicable entry) or a coding system
+object (the entry specified a coding system)."
+ (let ((alist file-coding-system-alist)
+ (found nil)
+ (codesys nil))
+ (let ((case-fold-search nil))
+ (setq filename (file-name-sans-versions filename))
+ (while (and (not found) alist)
+ (if (string-match (car (car alist)) filename)
+ (setq codesys (cdr (car alist))
+ found t))
+ (setq alist (cdr alist))))
+ (when codesys
+ (if (functionp codesys)
+ (setq codesys (funcall codesys 'write-region filename))
+ )
+ (cond ((consp codesys) (find-coding-system (cdr codesys)))
+ ((find-coding-system codesys))
+ ))))
+
+;; This was completely broken, not only in implementation (does not
+;; understand MIME), but in concept -- such high-level decoding should
+;; be done by mail readers, not by IO code! Removed 2000-04-18.
+
+;(defun convert-mbox-coding-system (filename visit start end) ...)
+
+(defun find-coding-system-magic-cookie ()
+ "Look for the coding-system magic cookie in the current buffer.
+The coding-system magic cookie is the exact string
+\";;;###coding system: \" followed by a valid coding system symbol,
+somewhere within the first 3000 characters of the file. If found,
+the coding system symbol is returned; otherwise nil is returned.
+Note that it is extremely unlikely that such a string would occur
+coincidentally as the result of encoding some characters in a non-ASCII
+charset, and that the spaces make it even less likely since the space
+character is not a valid octet in any ISO 2022 encoding of most non-ASCII
+charsets."
+ (save-excursion
+ (goto-char (point-min))
+ (or (and (looking-at
+ "^[^\n]*-\\*-[^\n]*coding: \\([^ \t\n;]+\\)[^\n]*-\\*-")
+ (let ((codesys (intern (buffer-substring
+ (match-beginning 1)(match-end 1)))))
+ (if (find-coding-system codesys) codesys)))
+ ;; (save-excursion
+ ;; (let (start end)
+ ;; (and (re-search-forward "^;+[ \t]*Local Variables:" nil t)
+ ;; (setq start (match-end 0))
+ ;; (re-search-forward "\n;+[ \t]*End:")
+ ;; (setq end (match-beginning 0))
+ ;; (save-restriction
+ ;; (narrow-to-region start end)
+ ;; (goto-char start)
+ ;; (re-search-forward "^;;; coding: \\([^\n]+\\)$" nil t)
+ ;; )
+ ;; (let ((codesys
+ ;; (intern (buffer-substring
+ ;; (match-beginning 1)(match-end 1)))))
+ ;; (if (find-coding-system codesys) codesys))
+ ;; )))
+ (let ((case-fold-search nil))
+ (if (search-forward
+ ";;;###coding system: " (+ (point-min) 3000) t)
+ (let ((start (point))
+ (end (progn
+ (skip-chars-forward "^ \t\n\r")
+ (point))))
+ (if (> end start)
+ (let ((codesys (intern (buffer-substring start end))))
+ (if (find-coding-system codesys) codesys)))
+ )))
+ )))
+
+(defun load (file &optional noerror nomessage nosuffix)
+ "Execute a file of Lisp code named FILE.
+First tries FILE with .elc appended, then tries with .el,
+ then tries FILE unmodified. Searches directories in load-path.
+If optional second arg NOERROR is non-nil,
+ report no error if FILE doesn't exist.
+Print messages at start and end of loading unless
+ optional third arg NOMESSAGE is non-nil.
+If optional fourth arg NOSUFFIX is non-nil, don't try adding
+ suffixes .elc or .el to the specified name FILE.
+Return t if file exists."
+ (let* ((filename (substitute-in-file-name file))
+ (handler (find-file-name-handler filename 'load))
+ (path nil))
+ (if handler
+ (funcall handler 'load filename noerror nomessage nosuffix)
+ (if (or (<= (length filename) 0)
+ (null (setq path
+ (locate-file filename load-path
+ (and (not nosuffix) '(".elc" ".el" ""))))))
+ (and (null noerror)
+ (signal 'file-error (list "Cannot open load file" filename)))
+ ;; now use the internal load to actually load the file.
+ (load-internal
+ file noerror nomessage nosuffix
+ (let ((elc ; use string= instead of string-match to keep match-data.
+ (string= ".elc" (downcase (substring path -4)))))
+ (or (and (not elc) coding-system-for-read) ; prefer for source file
+ ;; find magic-cookie
+ (save-excursion
+ (set-buffer (get-buffer-create " *load*"))
+ (erase-buffer)
+ (let ((coding-system-for-read 'raw-text))
+ (insert-file-contents path nil 0 3000))
+ (find-coding-system-magic-cookie))
+ (if elc
+ ;; if reading a byte-compiled file and we didn't find
+ ;; a coding-system magic cookie, then use `binary'.
+ ;; We need to guarantee that we never do autodetection
+ ;; on byte-compiled files because confusion here would
+ ;; be a very bad thing. Pre-existing byte-compiled
+ ;; files are always in the `binary' coding system.
+ ;; Also, byte-compiled files always use `lf' to terminate
+ ;; a line; don't risk confusion here either.
+ 'binary
+ (or (find-file-coding-system-for-read-from-filename path)
+ ;; looking up in `file-coding-system-alist'.
+ ;; otherwise use `buffer-file-coding-system-for-read',
+ ;; as normal
+ buffer-file-coding-system-for-read)
+ )))
+ )))))
+
+(defvar insert-file-contents-access-hook nil
+ "A hook to make a file accessible before reading it.
+`insert-file-contents' calls this hook before doing anything else.
+Called with two arguments: FILENAME and VISIT, the same as the
+corresponding arguments in the call to `insert-file-contents'.")
+
+(defvar insert-file-contents-pre-hook nil
+ "A special hook to decide the coding system used for reading in a file.
+
+Before reading a file, `insert-file-contents' calls the functions on
+this hook with arguments FILENAME and VISIT, the same as the
+corresponding arguments in the call to `insert-file-contents'. In
+these functions, you may refer to the global variable
+`buffer-file-coding-system-for-read'.
+
+The return value of the functions should be either
+
+-- nil
+-- A coding system or a symbol denoting it, indicating the coding system
+ to be used for reading the file
+-- A list of two elements (absolute pathname and length of data inserted),
+ which is used as the return value to `insert-file-contents'. In this
+ case, `insert-file-contents' assumes that the function has inserted
+ the file for itself and suppresses further reading.
+
+If any function returns non-nil, the remaining functions are not called.")
+
+(defvar insert-file-contents-error-hook nil
+ "A hook to set `buffer-file-coding-system' when a read error has occurred.
+
+When a file error (e.g. nonexistent file) occurs while read a file,
+`insert-file-contents' calls the functions on this hook with three
+arguments: FILENAME and VISIT (the same as the corresponding arguments
+in the call to `insert-file-contents') and a cons (SIGNALED-CONDITIONS
+. SIGNAL-DATA).
+
+After calling this hook, the error is signalled for real and
+propagates to the caller of `insert-file-contents'.")
+
+(defvar insert-file-contents-post-hook nil
+ "A hook to set `buffer-file-coding-system' for the current buffer.
+
+After successful reading, `insert-file-contents' calls the functions
+on this hook with four arguments: FILENAME and VISIT (the same as the
+corresponding arguments in the call to `insert-file-contents'),
+CODING-SYSTEM (the actual coding system used to decode the file), and
+a cons of absolute pathname and length of data inserted (the same
+thing as will be returned from `insert-file-contents').")
+
+(defun insert-file-contents (filename &optional visit start end replace)
+ "Insert contents of file FILENAME after point.
+Returns list of absolute file name and length of data inserted.
+If second argument VISIT is non-nil, the buffer's visited filename
+and last save file modtime are set, and it is marked unmodified.
+If visiting and the file does not exist, visiting is completed
+before the error is signaled.
+
+The optional third and fourth arguments START and END
+specify what portion of the file to insert.
+If VISIT is non-nil, START and END must be nil.
+If optional fifth argument REPLACE is non-nil,
+it means replace the current buffer contents (in the accessible portion)
+with the file contents. This is better than simply deleting and inserting
+the whole thing because (1) it preserves some marker positions
+and (2) it puts less data in the undo list.
+
+The coding system used for decoding the file is determined as follows:
+
+1. `coding-system-for-read', if non-nil.
+2. The result of `insert-file-contents-pre-hook', if non-nil.
+3. The matching value for this filename from
+ `file-coding-system-alist', if any.
+4. `buffer-file-coding-system-for-read', if non-nil.
+5. The coding system 'raw-text.
+
+If a local value for `buffer-file-coding-system' in the current buffer
+does not exist, it is set to the coding system which was actually used
+for reading.
+
+See also `insert-file-contents-access-hook',
+`insert-file-contents-pre-hook', `insert-file-contents-error-hook',
+and `insert-file-contents-post-hook'."
+ (let (return-val coding-system used-codesys)
+ ;; OK, first load the file.
+ (condition-case err
+ (progn
+ (run-hook-with-args 'insert-file-contents-access-hook
+ filename visit)
+ ;; determine the coding system to use, as described above.
+ (setq coding-system
+ (or
+ ;; #1.
+ coding-system-for-read
+ ;; #2.
+ (run-hook-with-args-until-success
+ 'insert-file-contents-pre-hook
+ filename visit)
+ ;; #3.
+ (find-file-coding-system-for-read-from-filename filename)
+ ;; #4.
+ buffer-file-coding-system-for-read
+ ;; #5.
+ 'raw-text))
+ (if (consp coding-system)
+ (setq return-val coding-system)
+ (if (null (find-coding-system coding-system))
+ (progn
+ (message
+ "Invalid coding-system (%s), using 'undecided"
+ coding-system)
+ (setq coding-system 'undecided)))
+ (setq return-val
+ (insert-file-contents-internal filename visit start end
+ replace coding-system
+ ;; store here!
+ 'used-codesys))
+ ))
+ (file-error
+ (run-hook-with-args 'insert-file-contents-error-hook
+ filename visit err)
+ (signal (car err) (cdr err))))
+ (setq coding-system used-codesys)
+ ;; call any `post-read-conversion' for the coding system that
+ ;; was used ...
+ (let ((func
+ (coding-system-property coding-system 'post-read-conversion))
+ (endmark (make-marker)))
+ (set-marker endmark (+ (point) (nth 1 return-val)))
+ (if func
+ (unwind-protect
+ (save-excursion
+ (let (buffer-read-only)
+ (funcall func (point) (marker-position endmark))))
+ (if visit
+ (progn
+ (set-buffer-auto-saved)
+ (set-buffer-modified-p nil)))))
+ (setcar (cdr return-val) (- (marker-position endmark) (point))))
+ ;; now finally set the buffer's `buffer-file-coding-system'.
+ (if (run-hook-with-args-until-success 'insert-file-contents-post-hook
+ filename visit return-val)
+ nil
+ (if (local-variable-p 'buffer-file-coding-system (current-buffer))
+ ;; if buffer-file-coding-system is already local, just
+ ;; set its eol type to what was found, if it wasn't
+ ;; set already.
+ (set-buffer-file-coding-system
+ (subsidiary-coding-system buffer-file-coding-system
+ (coding-system-eol-type coding-system)))
+ ;; otherwise actually set buffer-file-coding-system.
+ (set-buffer-file-coding-system coding-system)))
+ return-val))
+
+(defvar write-region-pre-hook nil
+ "A special hook to decide the coding system used for writing out a file.
+
+Before writing a file, `write-region' calls the functions on this hook with
+arguments START, END, FILENAME, APPEND, VISIT, LOCKNAME and CODING-SYSTEM,
+the same as the corresponding arguments in the call to `write-region'.
+
+The return value of each function should be one of
+
+-- nil
+-- A coding system or a symbol denoting it, indicating the coding system
+ to be used for writing the file
+-- A list of two elements (absolute pathname and length of data written),
+ which is used as the return value to `write-region'. In this case,
+ `write-region' assumes that the function has written the file and
+ returns.
+
+If any function returns non-nil, the remaining functions are not called.")
+
+(defvar write-region-post-hook nil
+ "A hook called by `write-region' after a file has been written out.
+
+The functions on this hook are called with arguments START, END,
+FILENAME, APPEND, VISIT, LOCKNAME, and CODING-SYSTEM, the same as the
+corresponding arguments in the call to `write-region'.")
+
+(defun write-region (start end filename
+ &optional append visit lockname coding-system)
+ "Write current region into specified file.
+By default the file's existing contents are replaced by the specified region.
+Called interactively, prompts for a file name. With a prefix arg, prompts
+for a coding system as well.
+
+When called from a program, takes three required arguments:
+START, END and FILENAME. START and END are buffer positions.
+Optional fourth argument APPEND if non-nil means
+ append to existing file contents (if any).
+Optional fifth argument VISIT if t means
+ set last-save-file-modtime of buffer to this file's modtime
+ and mark buffer not modified.
+If VISIT is a string, it is a second file name;
+ the output goes to FILENAME, but the buffer is marked as visiting VISIT.
+ VISIT is also the file name to lock and unlock for clash detection.
+If VISIT is neither t nor nil nor a string,
+ that means do not print the \"Wrote file\" message.
+The optional sixth arg LOCKNAME, if non-nil, specifies the name to
+ use for locking and unlocking, overriding FILENAME and VISIT.
+Kludgy feature: if START is a string, then that string is written
+to the file, instead of any buffer contents, and END is ignored.
+Optional seventh argument CODING-SYSTEM specifies the coding system
+ used to encode the text when it is written out, and defaults to
+ the value of `buffer-file-coding-system' in the current buffer.
+See also `write-region-pre-hook' and `write-region-post-hook'."
+ (interactive "r\nFWrite region to file: \ni\ni\ni\nZCoding-system: ")
+ (setq coding-system
+ (or coding-system-for-write
+ (run-hook-with-args-until-success
+ 'write-region-pre-hook
+ start end filename append visit lockname coding-system)
+ coding-system
+ buffer-file-coding-system
+ (find-file-coding-system-for-write-from-filename filename)
+ ))
+ (if (consp coding-system)
+ ;; One of the `write-region-pre-hook' functions wrote the file
+ coding-system
+ (let ((func
+ (coding-system-property coding-system 'pre-write-conversion)))
+ (if func
+ (let ((curbuf (current-buffer))
+ (tempbuf (generate-new-buffer " *temp-write-buffer*"))
+ (modif (buffer-modified-p)))
+ (unwind-protect
+ (save-excursion
+ (set-buffer tempbuf)
+ (erase-buffer)
+ (insert-buffer-substring curbuf start end)
+ (funcall func (point-min) (point-max))
+ (write-region-internal (point-min) (point-max) filename
+ append
+ (if (eq visit t) nil visit)
+ lockname
+ coding-system))
+ ;; leaving a buffer associated with file will cause problems
+ ;; when next visiting.
+ (kill-buffer tempbuf)
+ (if (or visit (null modif))
+ (progn
+ (set-buffer-auto-saved)
+ (set-buffer-modified-p nil)
+ (if (buffer-file-name) (set-visited-file-modtime))))))
+ (write-region-internal start end filename append visit lockname
+ coding-system)))
+ (run-hook-with-args 'write-region-post-hook
+ start end filename append visit lockname
+ coding-system)))
+
+;;; code-files.el ends here
projects / chise / xemacs-chise.git- / blobdiff