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;;; emms-i18n.el --- Function for handling coding system
;; Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
;;
;; Author: Ye Wenbin <wenbinye@163.com>
;; This file is part of EMMS.
;; This program 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 3, or (at your option)
;; any later version.
;;
;; This program 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 this program; if not, write to the Free Software
;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; When read from process, first check the CAR part of
;; `emms-i18n-default-coding-system', if non-nil, use this for decode, and
;; nerver detect coding system, if nil, first call
;; `emms-i18n-coding-dectect-functions' to get coding system, if success,
;; decode the result, otherwise, use `emms-i18n-detect-coding-function',
;; the emacs detect coding function, if the coding detected is not in
;; `emms-i18n-nerver-used-coding-system', decode it, otherwise use
;; locale-coding-system.
;;
;; When write send data to process, first check the CDR part of
;; `emms-i18n-default-coding-system', if non-nil, use this to encode data,
;; otherwise do nothing, that means use `default-process-coding-system' or
;; `process-coding-system-alist' to encode data.
;; Put this file into your load-path and the following into your ~/.emacs:
;; (require 'emms-i18n)
;;; Code:
(provide 'emms-i18n)
(eval-when-compile
(require 'cl))
;; TODO: Change these to use defcustom
(defvar emms-i18n-nerver-used-coding-system
'(raw-text undecided)
"If the `emms-i18n-coding-dectect-functions' return coding system in
this list, use `emms-i18n-default-coding-system' instead.")
(defvar emms-i18n-coding-system-for-read 'utf-8
"If coding detect failed, use this for decode.")
(defvar emms-i18n-default-coding-system '(no-conversion . no-conversion)
"If non-nil, used for decode and encode.")
(defvar emms-i18n-coding-dectect-functions nil
"A list of function to call to detect codings.")
(defvar emms-i18n-detect-max-size 10000
"Max bytes to detect coding system. Nil mean scan whole buffer.")
(defun emms-i18n-iconv (from to str)
"Convert STR from FROM coding to TO coding."
(if (and from to)
(decode-coding-string
(encode-coding-string str to)
from)
str))
(defun emms-i18n-iconv-region (beg end from to)
(when (and from to)
(save-restriction
(narrow-to-region beg end)
(encode-coding-region (point-min) (point-max) to)
(decode-coding-region (point-min) (point-max) from))))
(defun emms-i18n-iconv-buffer (from to &optional buf)
(save-excursion
(and buf (set-buffer buf))
(emms-i18n-iconv-region (point-min) (point-max) from to)))
(defun emms-i18n-set-default-coding-system (read-coding write-coding)
"Set `emms-i18n-default-coding-system'"
(interactive "zSet coding system for read: \nzSet coding system for write: ")
(setq emms-i18n-default-coding-system
(cons
(and (coding-system-p read-coding) read-coding)
(and (coding-system-p write-coding) write-coding)))
(message (concat
(if (car emms-i18n-default-coding-system)
(format "The coding system for read is %S." (car emms-i18n-default-coding-system))
"Good, you want detect coding system by me!")
(format " The coding system for write is %S."
(or (cdr emms-i18n-default-coding-system)
(cdr default-process-coding-system))))))
(defun emms-i18n-call-process-simple (&rest args)
"This function run program and return the program result.
If the CAR part of `emms-i18n-default-coding-system' is non-nil,
the program result will be decode use the CAR part of
emms-i18n-default-coding-system. Otherwise, use
`emms-i18n-coding-dectect-functions' to detect the coding system
of the result. If the emms-i18n-coding-dectect-functions failed,
use `emms-i18n-detect-coding-function' to detect coding
system. If all the coding system is nil or in
`emms-i18n-never-used-coding-system', decode the result using
`emms-i18n-coding-system-for-read'.
ARGS are the same as in `call-process', except the BUFFER should
always have value t. Otherwise the coding detection will not
perform."
(let ((default-process-coding-system (copy-tree default-process-coding-system))
(process-coding-system-alist nil) exit pos)
(when (eq (nth 2 args) 't)
(setcar default-process-coding-system (car emms-i18n-default-coding-system))
(setq pos (point)))
(setq exit (apply 'call-process args))
(when (and (eq (nth 2 args) 't)
(eq (car emms-i18n-default-coding-system) 'no-conversion))
(save-restriction
(narrow-to-region pos (point))
(decode-coding-region (point-min) (point-max) (emms-i18n-detect-buffer-coding-system))))
exit))
;; Is this function useful?
(defun emms-i18n-call-process (&rest args)
"Run the program like `call-process'. If
the cdr part `emms-i18n-default-coding-system' is non-nil, the string in
ARGS will be encode by the CDR part of `emms-i18n-default-coding-system',
otherwise, it is pass all parameter to `call-process'."
(with-temp-buffer
(if (cdr emms-i18n-default-coding-system)
(let ((default-process-coding-system emms-i18n-default-coding-system)
(process-coding-system-alist nil))
(apply 'call-process args))
(apply 'call-process args))))
(defun emms-i18n-detect-coding-function (size)
(detect-coding-region (point)
(+ (if (null emms-i18n-detect-max-size)
size
(min size emms-i18n-detect-max-size))
(point)) t))
(defun emms-i18n-detect-buffer-coding-system (&optional buf)
"Before call this function, make sure the buffer is literal"
(let ((size (- (point-max) (point-min)))
(func (append emms-i18n-coding-dectect-functions 'emms-i18n-detect-coding-function))
coding)
(save-excursion
(and buf (set-buffer buf))
(goto-char (point-min))
(when (> size 0)
(setq coding (run-hook-with-args-until-success 'func size))
(if (member (coding-system-base coding) emms-i18n-nerver-used-coding-system)
(setq coding (emms-i18n-detect-coding-function size))))
(if (or (null coding) (member (coding-system-base coding) emms-i18n-nerver-used-coding-system))
emms-i18n-coding-system-for-read
coding))))
;;; emms-i18n.el ends here
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