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1 ;;; filename.el --- file name filter
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2
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3 ;; Copyright (C) 1996 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 1.3 1997/03/16 03:05:44 steve Exp $
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7 ;; Keywords: string, file name
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8
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9 ;; This file is part of tl (Tiny 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 'tl-list)
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29 (require 'tl-str)
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30
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31
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32 ;;; @ variables
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33 ;;;
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34
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35 (defvar filename-limit-length 21)
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36
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37 (defvar filename-replacement-alist
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38 (list
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39 (cons (string-to-char-list " \t") "_")
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40 (cons (string-to-char-list (expand-char-ranges "!-*,/:;<>?[-^`{-~")) "_")
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41 '(filename-control-p . "")
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42 ))
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43
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44 (defvar filename-filters
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45 (nconc
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46 (and (exec-installed-p "kakasi")
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47 '(filename-japanese-to-roman-string)
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48 )
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49 '(filename-special-filter
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50 filename-eliminate-top-low-lines
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51 filename-canonicalize-low-lines
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52 filename-maybe-truncate-by-size
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53 filename-eliminate-bottom-low-lines
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54 )))
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55
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56
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57 ;;; @ filters
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58 ;;;
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59
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60 (defun filename-japanese-to-roman-string (str)
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61 (save-excursion
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62 (set-buffer (get-buffer-create " *temp kakasi*"))
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63 (erase-buffer)
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64 (insert str)
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65 (call-process-region (point-min)(point-max) "kakasi" t t t
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66 "-Ha" "-Ka" "-Ja" "-Ea" "-ka")
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67 (buffer-string)
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68 ))
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69
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70 (defun filename-control-p (character)
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71 (let ((code (char-int character)))
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72 (or (< code 32)(= code 127))
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73 ))
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74
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75 (defun filename-special-filter (string)
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76 (let (dest
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77 (i 0)
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78 (len (length string))
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79 (b 0)
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80 )
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81 (while (< i len)
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82 (let* ((chr (sref string i))
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83 (ret (ASSOC chr filename-replacement-alist
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84 :test (function
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85 (lambda (chr key)
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86 (if (functionp key)
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87 (funcall key chr)
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88 (memq chr key)
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89 )
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90 ))))
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91 )
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92 (if ret
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93 (setq dest (concat dest (substring string b i)(cdr ret))
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94 i (+ i (char-length chr))
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95 b i)
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96 (setq i (+ i (char-length chr)))
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97 )))
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98 (concat dest (substring string b))
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99 ))
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100
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101 (defun filename-eliminate-top-low-lines (string)
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102 (if (string-match "^_+" string)
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103 (substring string (match-end 0))
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104 string))
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105
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106 (defun filename-canonicalize-low-lines (string)
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107 (let (dest)
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108 (while (string-match "__+" string)
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109 (setq dest (concat dest (substring string 0 (1+ (match-beginning 0)))))
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110 (setq string (substring string (match-end 0)))
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111 )
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112 (concat dest string)
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113 ))
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114
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115 (defun filename-maybe-truncate-by-size (string)
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116 (if (and (> (length string) filename-limit-length)
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117 (string-match "_" string filename-limit-length)
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118 )
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119 (substring string 0 (match-beginning 0))
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120 string))
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121
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122 (defun filename-eliminate-bottom-low-lines (string)
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123 (if (string-match "_+$" string)
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124 (substring string 0 (match-beginning 0))
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125 string))
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126
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127
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128 ;;; @ interface
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129 ;;;
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130
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131 (defun replace-as-filename (string)
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132 "Return safety filename from STRING. [filename.el]"
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76
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133 (and string
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134 (poly-funcall filename-filters string)
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135 ))
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74
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136
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137
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138 ;;; @ end
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139 ;;;
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140
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141 (provide 'filename)
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142
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143 ;;; filename.el ends here
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