Questions tagged [dynamic-scoping]
26 questions
10
votes
3 answers
Why does defvar scoping work differently without an initvalue?
Suppose I have a file named elisp-defvar-test.el containing:
;;; elisp-defvar-test.el --- -*- lexical-binding: t -*-
(defvar my-dynamic-var)
(defun f1 (x)
"Should return X."
(let ((my-dynamic-var x))
(f2)))
(defun f2 ()
"Returns the…
Ryan C. Thompson
- 435
- 2
- 10
6
votes
1 answer
Why does calling expand-file-name indirectly produce a different result?
Running the following in ielm in emacs -Q:
ELISP> (defun wh/expand-file-name (name &optional default-directory)
(expand-file-name name default-directory))
wh/expand-file-name
ELISP> (expand-file-name "http://example.com"…
Wilfred Hughes
- 6,890
- 2
- 29
- 59
6
votes
1 answer
Scope in lambda
In my .emacs conf file, I've got this function that adds a hook to set the compile-command based on the mode. It looks something like,
(defun set-compile-cmd (mode-hook cmd)
(add-hook mode-hook (lambda ()
(set (make-local-variable…
user1943733
- 63
- 3
5
votes
1 answer
About closure creation
After reading this article about readable closures, I check that:
Since closures are byte-code function objects, they print readably.
You can capture an environment in a closure, serialize it, read it
back in, and evaluate it. That’s pretty…
anquegi
- 739
- 5
- 21
4
votes
1 answer
why is a let binding is ignored in compiled function?
I have this function which works perfectly in an uncompiled function. It should let-bind the variable bibtex-completion-bibliography to the result of (org-ref-find-bibliography).
(defun org-ref-valid-keys ()
"Return a list of valid bibtex…
John Kitchin
- 11,555
- 1
- 19
- 41
3
votes
3 answers
How does scoping work in emacs lisp
A lot of emacs configurations shared publicly have this format:
;; 01-something.el
(provide 'something)
;; init.el
(require 'something)
Suppose I'm writing a defun named "s-join" inside 01-something.el
Suppose somewhere during init.el…
american-ninja-warrior
- 3,773
- 2
- 21
- 40
3
votes
1 answer
How does one "extend" an existing function?
What I want to do: have the function evil-delete do one more task after its usual code. (I'm presuming that evil-delete is the underlying workhorse that is called by evil-delete-line and about five other functions.) evil-delete takes optional…
not-just-yeti
- 133
- 5
3
votes
1 answer
How do I temporarily mock a function for testing?
I'd like to patch some elisp functions inside my unit tests. I've tried cl-labels and cl-flet, but neither achieve the result I want:
(defun return-number ()
1)
(defun calls-return-number ()
(return-number))
(defun patch-cl-labels ()
…
Wilfred Hughes
- 6,890
- 2
- 29
- 59
2
votes
1 answer
`make-local-variable` Behaves Differently depending on Whether Variable is Special
Two examples (both are in the *scratch* buffer and under lexical scoping rule):
_
(setq xx :default)
(let ((xx :let))
(with-current-buffer (get-buffer-create "tmp")
(make-local-variable 'xx)
;; set the value of xx, buffer-locally
…
shynur
- 4,065
- 1
- 3
- 23
2
votes
0 answers
Can I set a variable scoped to a perspective?
I have a large monorepo repository and open different parts of it in a persp-mode perspective. It would be nice if for all buffers owned by that perspective I could set for example projectile-project-root. Is this possible?
Side note (not part of…
George Mauer
- 397
- 2
- 9
2
votes
2 answers
Accessing the global value of a locally altered variable
Is it possible to access the global value of a variable that has been
changed locally?
(setq foo 2)
(let ((foo 3))
;; can I access the original value here?
)
Toothrot
- 3,204
- 1
- 12
- 30
2
votes
3 answers
Changing a mode's keymap for the duration of a command's execution
I would like to bind TAB to my company-mode back-end only for the duration of a command's execution. I am trying to achieve this by using dynamic scoping as follows (the irrelevant part of the function is not shown):
(defun my-function()
…
AlwaysLearning
- 749
- 4
- 14
2
votes
1 answer
Why is org-table-calc-current-TBLFM throwing Wrong type argument: integer-or-marker-p Error?
Why does my code generate the error when used with org-table?
No error message when code used outside of org-table
#+NAME: get-country-or-area-name
#+HEADER: :var iso-alpha2-code="ca"
#+HEADER: :var dc-list='((US . "United States of America") (CA .…
Melioratus
- 4,504
- 1
- 25
- 43
1
vote
1 answer
Warning: assignment to free variable ‘skeleton-pair’
Am using the following function, but getting the error
In bracemk-balance:
fencones.el:109:9:Warning: assignment to free variable
‘skeleton-pair’
What is wrong with this?
(defun bracemk-balance ()
"Completing brace marks group."
(setq…
Dilna
- 1,173
- 3
- 10
1
vote
1 answer
Inconsistency in emacs' rules of scope?
I have always felt that emacs' rules of scope are a bit strange
and prone to contradictions. In fact I have even attempted to file
bug reports just to be told that my interpretation of the rules of scope
was wrong, which I always reluctantly…
Ruy
- 787
- 4
- 11