* disp-table.el (standard-display-european): Remove undocumented

arg AUTO; no longer used by startup.el.  Do not attempt to treat
all non-English language environments as coding system names.
Instead, use the downcased language environment name as a coding
system name if it is one; otherwise, use latin-1.

2 files changed, 18 insertions, 23 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 7da51a8e0c1..9d6346fece8 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,11 @@
+1999-10-20  Paul Eggert  <eggert@twinsun.com>
+
+        * disp-table.el (standard-display-european): Remove undocumented
+        arg AUTO; no longer used by startup.el.  Do not attempt to treat
+        all non-English language environments as coding system names.
+        Instead, use the downcased language environment name as a coding
+        system name if it is one; otherwise, use latin-1.
+
 1999-10-20  Gerd Moellmann  <gerd@gnu.org>
 
         * dired.el (dired-move-to-filename-regexp): Fix long comment lines
diff --git a/lisp/disp-table.el b/lisp/disp-table.el
index f2855692a09..7732956be91 100644
--- a/lisp/disp-table.el
+++ b/lisp/disp-table.el
@@ -176,7 +176,7 @@ X frame."
   (1- (length glyph-table)))
 
 ;;;###autoload
-(defun standard-display-european (arg &optional auto)
+(defun standard-display-european (arg)
   "Semi-obsolete way to toggle display of ISO 8859 European characters.
 
 This function is semi-obsolete; if you want to do your editing with
@@ -199,16 +199,6 @@ selects unibyte mode for all Emacs buffers \(both existing buffers and
 those created subsequently).  This provides increased compatibility
 for users who call this function in `.emacs'."
 
-  ;; If the optional argument AUTO is non-nil, this function
-  ;; does not alter `enable-multibyte-characters'.
-  ;; AUTO also specifies, in this case, the coding system for terminal output.
-  ;; The AUTO argument is meant for use by startup.el only.
-  ;; which is why it is not in the doc string.
-
-  ;; AUTO is `lambda' for an interactive call so that it will not
-  ;; set enable-multibyte-characters but also will not call
-  ;; set-terminal-coding-system.
-  (interactive (list current-prefix-arg 'lambda))
   (if (or (<= (prefix-numeric-value arg) 0)
           (and (null arg)
                (char-table-p standard-display-table)
@@ -217,12 +207,12 @@ for users who call this function in `.emacs'."
       (progn
         (standard-display-default 160 255)
         (unless (or (memq window-system '(x w32))
-                    (eq auto 'lambda))
+                    (interactive-p))
           (and (terminal-coding-system)
                (set-terminal-coding-system nil))))
     ;; If the user does this explicitly from Lisp (as in .emacs),
     ;; turn off multibyte chars for more compatibility.
-    (unless auto
+    (unless (interactive-p)
       (setq-default enable-multibyte-characters nil)
       (mapcar (lambda (buffer)
                 (with-current-buffer buffer
@@ -232,20 +222,17 @@ for users who call this function in `.emacs'."
     ;; If the user does this explicitly,
     ;; switch to Latin-1 language environment
     ;; unless some other has been specified.
-    (unless auto
+    (unless (interactive-p)
       (if (equal current-language-environment "English")
           (set-language-environment "latin-1")))
     (unless (or noninteractive (memq window-system '(x w32))
-                (eq auto 'lambda))
-      ;; Send those codes literally to a non-X terminal.
-      ;; If AUTO is nil, we are using single-byte characters,
-      ;; so it doesn't matter which one we use.
+                (interactive-p))
+      ;; Send those codes literally to a character-based terminal.
+      ;; If we are using single-byte characters,
+      ;; it doesn't matter which coding system we use.
       (set-terminal-coding-system
-       (cond ((not (equal current-language-environment "English"))
-              (intern (downcase current-language-environment)))
-             ((eq auto t) 'latin-1)
-             ((symbolp auto) (or auto 'latin-1))
-             ((stringp auto) (intern auto)))))
+       (let ((c (intern (downcase current-language-environment))))
+         (if (coding-system-p c) c 'latin-1))))
     (standard-display-european-internal)))
 
 (provide 'disp-table)