[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

with a fresh emacs "(buffer-local-value fundamental-mode (current-buffe

Subject: with a fresh emacs "(buffer-local-value fundamental-mode (current-buffer))" error.
Date: Wed, 8 Apr 2009 17:58:36 -0400

Is this a bug, or am I missing something?

`buffer-local-value' docstring says:

"Return the value of variable in buffer.
If variable does not have a buffer-local binding in buffer, the value
is the ***default binding*** of the variable."  [asterisks mine]

Is this the default binding of buffers local variable or the default
binding of the Global Variable?
With a fresh emacs "(buffer-local-value longlines-mode (current-buffer))"
With a fresh Emacs, if a mode hasn't been called interactively e.g.
M-x fundamental-mode
then evaluating:

(buffer-local-value fundamental-mode (current-buffer))

throws an error, even though evaluating:

mode-name => "Fundamental"


major-mode => fundamental-mode

This behavior happens with minor and major modes.

For example (still in a fresh emacs):
(buffer-local-value longlines-mode (current-buffer))

Debugger entered--Lisp error: (void-variable longlines-mode)
  (buffer-local-value longlines-mode (current-buffer))
  (and (buffer-local-value longlines-mode (current-buffer)))
  eval((and (buffer-local-value longlines-mode (current-buffer))))
  eval-expression((and (buffer-local-value longlines-mode
(current-buffer))) nil)
  call-interactively(eval-expression nil nil)
However, after interactively M-x longlines-mode

(plist-member buffer-file-format 'longlines) = > (longlines)
buffer-file-format => longlines
(local-variable-p 'longlines-mode) => t

(plist-member buffer-file-format (buffer-local-variables)) => nil

Now if:
M-x fundamental-mode

Now evaluating:

major-mode => fundamental-mode

(plist-member major-mode (buffer-local-variables)) => fundamental-mode

mode-name => "Fundamental"

(insert (format "%s" (buffer-local-variables))) =>
( {...} (mode-name . Fundamental) (major-mode . fundamental-mode)
(buffer-file-format longlines) {...} ) ;{...Ellided...}

(local-variable-p 'fundamental-mode) => nil

(buffer-local-value fundamental-mode (current-buffer))

Still gives an error:
Debugger entered--Lisp error: (void-variable fundamental-mode)
  (buffer-local-value fundamental-mode (current-buffer))
  eval((buffer-local-value fundamental-mode (current-buffer)))
  call-interactively(eval-last-sexp nil nil)

Whereas with longlines-mode having been set per above evaluating:

(buffer-local-value longlines-mode (current-buffer))

No longer drops me into the debugger?

Evaluated on two different emacsen:

GNU Emacs (i386-mingw-nt5.1.2600) of 2009-02-26 on SOFT-MJASON
GNU Emacs (i386-mingw-nt5.1.2600)  of 2009-03-31 on
LENNART-69DE564 (patched)

reply via email to

[Prev in Thread] Current Thread [Next in Thread]