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1 ;;; filename.el --- file name filter
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2
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3 ;; Copyright (C) 1996,1997 MORIOKA Tomohiko
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4
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5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
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6 ;; Version: $Id: filename.el,v 1.1 1997/06/03 04:18:35 steve Exp $
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7 ;; Keywords: file name, string
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8
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9 ;; This file is part of APEL (A Portable Emacs Library).
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10
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11 ;; This program is free software; you can redistribute it and/or
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12 ;; modify it under the terms of the GNU General Public License as
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13 ;; published by the Free Software Foundation; either version 2, or (at
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14 ;; your option) any later version.
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15
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16 ;; This program is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
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23 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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24 ;; Boston, MA 02111-1307, USA.
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25
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26 ;;; Code:
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27
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28 (require 'emu)
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29 (require 'cl)
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30
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31 (defsubst poly-funcall (functions argument)
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32 "Apply initial ARGUMENT to sequence of FUNCTIONS.
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33 FUNCTIONS is list of functions.
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34
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35 (poly-funcall '(f1 f2 .. fn) arg) is as same as
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36 (fn .. (f2 (f1 arg)) ..).
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37
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38 For example, (poly-funcall '(car number-to-string) '(100)) returns
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39 \"100\"."
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40 (while functions
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41 (setq argument (funcall (car functions) argument)
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42 functions (cdr functions))
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43 )
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44 argument)
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45
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46
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47 ;;; @ variables
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48 ;;;
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49
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50 (defvar filename-limit-length 21 "Limit size of file-name.")
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51
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52 (defvar filename-replacement-alist
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53 '(((?\ ?\t) . "_")
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54 ((?! ?\" ?# ?$ ?% ?& ?' ?\( ?\) ?* ?/
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55 ?: ?\; ?< ?> ?? ?\[ ?\\ ?\] ?` ?{ ?| ?}) . "_")
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56 (filename-control-p . "")
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57 )
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58 "Alist list of characters vs. string as replacement.
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59 List of characters represents characters not allowed as file-name.")
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60
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61 (defvar filename-filters
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62 (let ((filters '(filename-special-filter
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63 filename-eliminate-top-low-lines
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64 filename-canonicalize-low-lines
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65 filename-maybe-truncate-by-size
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66 filename-eliminate-bottom-low-lines
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67 )))
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68 (require 'file-detect)
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69 (if (exec-installed-p "kakasi")
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70 (cons 'filename-japanese-to-roman-string filters)
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71 filters))
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72 "List of functions for file-name filter.")
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73
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74
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75 ;;; @ filters
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76 ;;;
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77
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78 (defun filename-japanese-to-roman-string (str)
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79 (save-excursion
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80 (set-buffer (get-buffer-create " *temp kakasi*"))
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81 (erase-buffer)
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82 (insert str)
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83 (call-process-region (point-min)(point-max) "kakasi" t t t
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84 "-Ha" "-Ka" "-Ja" "-Ea" "-ka")
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85 (buffer-string)
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86 ))
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87
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88 (defun filename-control-p (character)
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89 (let ((code (char-int character)))
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90 (or (< code 32)(= code 127))
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91 ))
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92
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93 (defun filename-special-filter (string)
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94 (let (dest
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95 (i 0)
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96 (len (length string))
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97 (b 0)
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98 )
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99 (while (< i len)
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100 (let* ((chr (sref string i))
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101 (ret (assoc-if (function
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102 (lambda (key)
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103 (if (functionp key)
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104 (funcall key chr)
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105 (memq chr key)
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106 )))
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107 filename-replacement-alist))
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108 )
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109 (if ret
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110 (setq dest (concat dest (substring string b i)(cdr ret))
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111 i (+ i (char-length chr))
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112 b i)
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113 (setq i (+ i (char-length chr)))
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114 )))
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115 (concat dest (substring string b))
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116 ))
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117
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118 (defun filename-eliminate-top-low-lines (string)
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119 (if (string-match "^_+" string)
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120 (substring string (match-end 0))
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121 string))
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122
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123 (defun filename-canonicalize-low-lines (string)
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124 (let (dest)
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125 (while (string-match "__+" string)
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126 (setq dest (concat dest (substring string 0 (1+ (match-beginning 0)))))
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127 (setq string (substring string (match-end 0)))
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128 )
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129 (concat dest string)
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130 ))
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131
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132 (defun filename-maybe-truncate-by-size (string)
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133 (if (and (> (length string) filename-limit-length)
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134 (string-match "_" string filename-limit-length)
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135 )
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136 (substring string 0 (match-beginning 0))
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137 string))
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138
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139 (defun filename-eliminate-bottom-low-lines (string)
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140 (if (string-match "_+$" string)
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141 (substring string 0 (match-beginning 0))
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142 string))
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143
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144
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145 ;;; @ interface
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146 ;;;
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147
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148 (defun replace-as-filename (string)
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149 "Return safety filename from STRING.
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150 It refers variable `filename-filters' and default filters refers
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151 `filename-limit-length', `filename-replacement-alist'."
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152 (and string
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153 (poly-funcall filename-filters string)
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154 ))
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155
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156
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157 ;;; @ end
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158 ;;;
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159
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160 (provide 'filename)
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161
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162 ;;; filename.el ends here
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