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[elisp/lemi.git] / emacs-lisp / filename.el

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+;;; filename.el --- file name filter
+
+;; Copyright (C) 1996,1997 MORIOKA Tomohiko
+
+;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
+;; Version: $Id: filename.el,v 1.1.2.1 2000/02/03 02:26:43 tomo Exp $
+;; 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., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, 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
+  (let ((filters '(filename-special-filter
+                  filename-eliminate-top-low-lines
+                  filename-canonicalize-low-lines
+                  filename-maybe-truncate-by-size
+                  filename-eliminate-bottom-low-lines
+                  )))
+    (if (exec-installed-p "kakasi")
+       (cons 'filename-japanese-to-roman-string filters)
+      filters))
+  "List of functions for file-name filter.")
+
+
+;;; @ 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))))
+
+(defun filename-special-filter (string)
+  (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 (+ i (char-length chr))
+                 b i)
+         (setq i (+ i (char-length chr))))))
+    (concat dest (substring string b))))
+
+(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