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;;; mule-sysdp.el --- consolidate MULE-version dependencies in one file.
;; Copyright (c) 1996, 1997 William Perry
;; Author: William Perry <wmperry@cs.indiana.edu>
;; Keywords: lisp, tools
;; The purpose of this file is to eliminate the cruftiness that
;; would otherwise be required of packages that want to run on multiple
;; versions of Emacs with and without Mule support.
(require 'cl)
(defconst mule-sysdep-version (if (featurep 'mule)
(cond
((string-match "XEmacs" emacs-version)
'xemacs)
((and
(boundp 'mule-version)
(string-match "[0-9]+\\.[0-9]+"
mule-version))
(string-to-number (substring
mule-version
(match-beginning 0)
(match-end 0))))
(t 2.3))
0)
"What version of mule we are running under.")
(defconst mule-retrieval-coding-system
(case mule-sysdep-version
(2.3 *euc-japan*)
(2.4 'coding-system-euc-japan)
(3.0 'euc-japan)
(xemacs 'euc-japan)
(otherwise nil))
"Default retrieval coding system for packages that use this package.")
(defconst mule-no-coding-system
(case mule-sysdep-version
(2.3 *noconv*)
(2.4 'no-conversion)
(3.0 'no-conversion)
(xemacs 'no-conversion)
(otherwise nil))
"Coding system that means no coding system should be used.")
(defun mule-detect-coding-version (st nd)
(case mule-sysdep-version
(2.3 (code-detect-region (point-min) (point-max)))
((2.4 3.0 xemacs)
(detect-coding-region (point-min) (point-max)))
(otherwise nil)))
(defun mule-code-convert-region (st nd code)
(if (and (listp code) (car code))
(setq code (car code)))
(case mule-sysdep-version
(2.3
(set 'mc-flag t)
(code-convert-region (point-min) (point-max) code *internal*)
(set-file-coding-system code))
(2.4
(set (make-local-variable 'enable-multibyte-characters) t)
(if (memq code '(autodetect coding-system-automatic))
nil
(decode-coding-region st nd code)
(set-buffer-file-coding-system code)))
(3.0
(set (make-local-variable 'enable-multibyte-characters) t)
(if (memq code '(autodetect automatic-conversion))
nil
(or code (setq code 'automatic-conversion))
(decode-coding-region st nd code)
(set-buffer-file-coding-system code)))
(xemacs
(if (and (listp code) (not (car code)))
(progn
(setq code 'autodetect)
(condition-case ()
(get-coding-system 'autodetect)
(error (setq code 'automatic-conversion)))))
(decode-coding-region (point-min) (point-max) code)
(set-file-coding-system code))
(otherwise
nil)))
(defun mule-inhibit-code-conversion (proc)
(if (process-buffer proc)
(save-excursion
(set-buffer (process-buffer proc))
(set 'mc-flag nil)
(set 'enable-multibyte-characters nil)))
(case mule-sysdep-version
((3.0 2.4 2.3)
(set-process-coding-system proc mule-no-coding-system
mule-no-coding-system))
(xemacs
(set-process-input-coding-system proc mule-no-coding-system)
(set-process-input-coding-system proc mule-no-coding-system))))
(defun mule-write-region-no-coding-system (st nd file)
(let ((enable-multibyte-characters t)
(coding-system-for-write 'no-conversion)
(file-coding-system mule-no-coding-system)
(buffer-file-coding-system mule-no-coding-system)
(mc-flag t))
(case mule-sysdep-version
(2.3 (write-region st nd file nil nil nil *noconv*))
(otherwise
(write-region st nd file)))))
(defun mule-encode-string (str)
(case mule-sysdep-version
(2.3
(code-convert-string str *internal* mule-retrieval-coding-system))
((2.4 3.0 xemacs)
(encode-coding-string str mule-retrieval-coding-system))
(otherwise
str)))
(defun mule-decode-string (str)
(and str
(case mule-sysdep-version
((2.4 3.0 xemacs)
(decode-coding-string str mule-retrieval-coding-system))
(2.3
(code-convert-string str *internal* mule-retrieval-coding-system))
(otherwise
str))))
(defun mule-truncate-string (str len &optional pad)
"Truncate string STR so that string-width of STR is not greater than LEN.
If width of the truncated string is less than LEN, and if a character PAD is
defined, add padding end of it."
(case mule-sysdep-version
((2.4 3.0)
(let ((cl (string-to-vector str)) (n 0) (sw 0))
(if (<= (string-width str) len) str
(while (<= (setq sw (+ (char-width (aref cl n)) sw)) len)
(setq n (1+ n)))
(string-match (make-string n ?.) str)
(setq str (substring str 0 (match-end 0))))
(if pad (concat str (make-string (- len (string-width str)) pad)) str)))
(2.3
(let ((cl (string-to-char-list str)) (n 0) (sw 0))
(if (<= (string-width str) len) str
(while (<= (setq sw (+ (char-width (nth n cl)) sw)) len)
(setq n (1+ n)))
(string-match (make-string n ?.) str)
(setq str (substring str 0 (match-end 0))))
(if pad (concat str (make-string (- len (string-width str)) pad)) str)))
(otherwise
(concat (if (> (length str) len) (substring str 0 len) str)
(if (or (null pad) (> (length str) len))
""
(make-string (- len (length str)) pad))))))
(defun mule-find-charset-region (beg end &optional table)
(case mule-sysdep-version
(2.3 (code-detect-region beg end))
((2.4 3.0) (find-charset-region beg end table))
(xemacs (charsets-in-region beg end))
(otherwise '(no-conversion))))
(defun mule-coding-system-name (codesys)
(case mule-sysdep-version
(3.0 nil)
(xemacs (coding-system-name codesys))))
(defun mule-find-coding-system (sys)
(case mule-sysdep-version
((2.3 2.4) nil)
(3.0 (if (get sys 'coding-system) sys nil))
(xemacs (find-coding-system sys))
(otherwise nil)))
(defun mule-make-iso-character (char)
(if (<= char 127)
char
(case mule-sysdep-version
(2.3 (make-character lc-ltn1 char))
(2.4 (make-char charset-latin-iso8859-1 char))
(3.0 (make-char 'latin-iso8859-1 char))
(xemacs char)
(otherwise char))))
(case mule-sysdep-version
((2.3 2.4 3.0 xemacs) nil)
(otherwise (fset 'string-width 'length)))
(and
(boundp 'MULE)
(not (featurep 'mule))
(provide 'mule))
(provide 'mule-sysdp)
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