Add arch taglines

[bpt/emacs.git] / lisp / dos-fns.el

diff --git a/lisp/dos-fns.el b/lisp/dos-fns.el
index 1a727f1..65b6c00 100644 (file)
--- a/lisp/dos-fns.el
+++ b/lisp/dos-fns.el
@@ -42,7 +42,7 @@ with a definition that really does change some file names."
     (let ((flen (length filename)))
       ;; If FILENAME has a trailing slash, remove it and recurse.
       (if (memq (aref filename (1- flen)) '(?/ ?\\))
-         (concat (convert-standard-filename 
+         (concat (convert-standard-filename
                   (substring filename 0 (1- flen)))
                  "/")
        (let* (;; ange-ftp gets in the way for names like "/foo:bar".
@@ -74,18 +74,25 @@ with a definition that really does change some file names."
            ;; Change a leading period to a leading underscore.
            (if (= (aref string 0) ?.)
                (aset string 0 ?_))
+           ;; If the name is longer than 8 chars, and doesn't have a
+           ;; period, and we have a dash or underscore that isn't too
+           ;; close to the beginning, change that to a period.  This
+           ;; is so we could salvage more characters of the original
+           ;; name by pushing them into the extension.
+           (if (and (not (string-match "\\." string))
+                    (> (length string) 8)
+                    ;; We don't gain anything if we put the period closer
+                    ;; than 5 chars from the beginning (5 + 3 = 8).
+                    (setq i (string-match "[-_]" string 5)))
+               (aset string i ?\.))
            ;; Get rid of invalid characters.
            (while (setq i (string-match
                            "[^-a-zA-Z0-9_.%~^$!#&{}@`'()\200-\376]"
                            string))
              (aset string i ?_))
-           ;; If we don't have a period,
-           ;; and we have a dash or underscore that isn't the first char,
-           ;; change that to a period.
-           (if (and (not (string-match "\\." string))
-                    (setq i (string-match "[-_]" string 1)))
-               (aset string i ?\.))
            ;; If we don't have a period in the first 8 chars, insert one.
+           ;; This enables to have 3 more characters from the original
+           ;; name in the extension.
            (if (> (or (string-match "\\." string) (length string))
                   8)
                (setq string
@@ -98,13 +105,14 @@ with a definition that really does change some file names."
            (if (> (length string) (+ firstdot 4))
                (setq string (substring string 0 (+ firstdot 4))))
            ;; Change all periods except the first one into underscores.
+           ;; (DOS doesn't allow more than one period.)
            (while (string-match "\\." string (1+ firstdot))
              (setq i (string-match "\\." string (1+ firstdot)))
              (aset string i ?_))
-           ;; If the last character of the original filename was `~',
-           ;; make sure the munged name ends with it also.  This is so
-           ;; a backup file retains its final `~'.
-           (if (equal lastchar ?~)
+           ;; If the last character of the original filename was `~' or `#',
+           ;; make sure the munged name ends with it also.  This is so that
+           ;; backup and auto-save files retain their telltale form.
+           (if (memq lastchar '(?~ ?#))
                (aset string (1- (length string)) lastchar))))
          (concat (if (and (stringp dir)
                           (memq (aref dir dlen-m-1) '(?/ ?\\)))
@@ -244,4 +252,5 @@ that your video hardware might not support 50-line mode."
 
 (provide 'dos-fns)
 
+;;; arch-tag: 00b03579-8ebb-4a02-8762-5c5a929774ad
 ;;; dos-fns.el ends here