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;;; filename.el --- file name filter
;; Copyright (C) 1996,1997 MORIOKA Tomohiko
;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
;; Version: $Id$
;; Keywords: file name, string
;; This file is part of APEL (A Portable Emacs Library).
;; 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 2, 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Code:
(require 'emu) ; for backward compatibility.
(require 'poe) ; functionp.
(require 'poem) ; char-int, and char-length.
(require 'path-util)
(defsubst poly-funcall (functions argument)
"Apply initial ARGUMENT to sequence of FUNCTIONS.
FUNCTIONS is list of functions.
\(poly-funcall '(f1 f2 .. fn) arg) is as same as
\(fn .. (f2 (f1 arg)) ..).
For example, (poly-funcall '(car number-to-string) '(100)) returns
\"100\"."
(while functions
(setq argument (funcall (car functions) argument)
functions (cdr functions)))
argument)
;;; @ variables
;;;
(defvar filename-limit-length 21 "Limit size of file-name.")
(defvar filename-replacement-alist
'(((?\ ?\t) . "_")
((?! ?\" ?# ?$ ?% ?& ?' ?\( ?\) ?* ?/
?: ?\; ?< ?> ?? ?\[ ?\\ ?\] ?` ?{ ?| ?}) . "_")
(filename-control-p . ""))
"Alist list of characters vs. string as replacement.
List of characters represents characters not allowed as file-name.")
(defvar filename-filters nil
"List of functions for file-name filter.
Example:
\(setq filename-filters '\(filename-special-filter
filename-eliminate-top-low-lines
filename-canonicalize-low-lines
filename-maybe-truncate-by-size
filename-eliminate-bottom-low-lines\)\)
Moreover, if you want to convert Japanese filename to roman string by kakasi,
\(if \(exec-installed-p \"kakasi\"\)
\(setq filename-filters
\(append '\(filename-japanese-to-roman-string\) filename-filters\)\)\)")
;;; @ filters
;;;
(defun filename-japanese-to-roman-string (str)
(save-excursion
(set-buffer (get-buffer-create " *temp kakasi*"))
(erase-buffer)
(insert str)
(call-process-region
(point-min)(point-max)
"kakasi" t t t "-Ha" "-Ka" "-Ja" "-Ea" "-ka")
(buffer-string)))
(defun filename-control-p (character)
(let ((code (char-int character)))
(or (< code 32)(= code 127))))
(eval-when-compile
(defmacro filename-special-filter-1 (string)
(let (sref inc-i)
(if (or (not (fboundp 'sref))
(>= emacs-major-version 21)
(and (= emacs-major-version 20)
(>= emacs-minor-version 3)))
(setq sref 'aref
inc-i '(1+ i))
(setq sref 'aref
inc-i '(+ i (char-length chr))))
`(let ((len (length ,string))
(b 0)(i 0)
(dest ""))
(while (< i len)
(let ((chr (,sref ,string i))
(lst filename-replacement-alist)
ret)
(while (and lst (not ret))
(if (if (functionp (car (car lst)))
(setq ret (funcall (car (car lst)) chr))
(setq ret (memq chr (car (car lst)))))
t ; quit this loop.
(setq lst (cdr lst))))
(if ret
(setq dest (concat dest (substring ,string b i)
(cdr (car lst)))
i ,inc-i
b i)
(setq i ,inc-i))))
(concat dest (substring ,string b))))))
(defun filename-special-filter (string)
(filename-special-filter-1 string))
(defun filename-eliminate-top-low-lines (string)
(if (string-match "^_+" string)
(substring string (match-end 0))
string))
(defun filename-canonicalize-low-lines (string)
(let ((dest ""))
(while (string-match "__+" string)
(setq dest (concat dest (substring string 0 (1+ (match-beginning 0)))))
(setq string (substring string (match-end 0))))
(concat dest string)))
(defun filename-maybe-truncate-by-size (string)
(if (and (> (length string) filename-limit-length)
(string-match "_" string filename-limit-length))
(substring string 0 (match-beginning 0))
string))
(defun filename-eliminate-bottom-low-lines (string)
(if (string-match "_+$" string)
(substring string 0 (match-beginning 0))
string))
;;; @ interface
;;;
(defun replace-as-filename (string)
"Return safety filename from STRING.
It refers variable `filename-filters' and default filters refers
`filename-limit-length', `filename-replacement-alist'."
(and string
(poly-funcall filename-filters string)))
;;; @ end
;;;
(require 'product)
(product-provide (provide 'filename) (require 'apel-ver))
;;; filename.el ends here
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