Questions tagged [defvar]
The defvar tag has no usage guidance.
19 questions
9
votes
3
answers
528
views
Lambda in `defun` Captures the Lexical Environment, But in `let` It Doesn't
My example is simplified:
(defvar wtf 10)
(defun f (wtf)
(lambda ()
(cl-incf wtf)))
(setq f (f 20))
(setq g (let ((wtf 30))
(lambda ()
(cl-incf wtf))))
(list (funcall f)
...
- 5,890
4
votes
0
answers
203
views
Using a `defconst' or `defvar' While the Variable Has a Local Binding Sets the Global Binding?
The GNU Emacs Lisp Reference Manual, 12.5 Defining Global Variables:
If you use a defconst or defvar special form while the variable has a local binding (made with let, or a function argument), it ...
- 5,890
0
votes
3
answers
49
views
Is the capture template bound to a variable?
I have the following defvar that declares a variable and gives it a string value. Notice, I used the word "gives" but I was wondering if "bind" would be the proper one to use.
(...
- 491
1
vote
1
answer
121
views
What does defvar do in this code?
I know this may sound silly but what does defvar do in the code below? Does it define a variable that hold a capture template? or we say that the template is bound to the variable capture-template-...
- 491
1
vote
1
answer
34
views
How to provide my own ediff-make-wide-display-function for ediff
For Ediff's wide display feature I like to use my own ediff-make-wide-display function. Ediff has a variable for this: ediff-make-wide-display-function. However when I write:
(defun my-ediff-make-wide-...
- 1,385
1
vote
1
answer
139
views
Why are `defvars` in my macro ignored?
I want to use a macro to define variables. However, evaluating the macro does not define these vars. I seem to be missing something, but I can't find it. Here's the code:
(defmacro delve--build-cmp (...
4
votes
1
answer
80
views
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-...
- 12.1k
3
votes
1
answer
91
views
Use of defvar in straight.el's bootstrapping
The package straight.el requires the following bootstrapping code in your emacs config:
(defvar bootstrap-version)
(let ((bootstrap-file
(expand-file-name "straight/repos/straight.el/...
- 131
1
vote
0
answers
43
views
Storing and Loading Non-Static/Multiple Configs
I'm writing an emacs wrapper to a set of scripts that require a lot of config settings to run.
These can be variously environment variables, command line parameters and so forth. They should be user ...
- 545
10
votes
3
answers
397
views
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-...
- 435
2
votes
1
answer
234
views
How to use defvar with the symbol name in another variable?
I am trying to create a global variable which name is contained in another variable, using defvar:
(let ((var-name "my-test-var"))
;;(defvar (intern var-name) "some value")
(defvar (make-symbol ...
- 3,758
0
votes
1
answer
102
views
Converting an expression to a string
I would like to add an alternative answer to the thread How do I force re-evaluation of a defvar? Before doing so, however, I would like to learn how to eliminate the single-quote to prevent ...
- 19.5k
4
votes
1
answer
195
views
Test whether variable is defined, but not initialized
Q: How can I test (programmatically) whether a variable has been defined, but not initialized?
(defvar foo)
EXAMPLE:
(if (my-test foo)
(message "%s has been defined, but not initialized." foo)
...
- 19.5k
23
votes
1
answer
10k
views
What's the difference between setq and defvar
What is the difference between setq and defvar in Emacs lisp?
I see common lisp version of the same question at https://stackoverflow.com/questions/3855862. Are they same in Elisp?
- 2,246
0
votes
2
answers
189
views
Warning assigning variables
I'm rebuilding my emacs configuration, and trying to compile without warnings. I'm using also cask. I have this case:
(require 'magit)
;; Enable a right limit of 70 chars for git logs
(add-hook '...
- 749
11
votes
4
answers
685
views
Can I reload a library and have defvar re-assign values?
I am developing a library and would like to reload it after editing without exiting Emacs (assume that it is on load-path):
(load-library "myname")
When I do this, Emacs doesn't pick up changes to ...
- 3,552
22
votes
1
answer
7k
views
What does `setq-local` do, and when should I use it?
I'm not quite clear on all the variations of buffer-local variables, even
after reading all the doc and a bunch of postings here on SX.
Here's a summary of my understandings:
(defvar foo ..) ...
- 1,328
4
votes
1
answer
1k
views
change value of a defvar after loading package
I load a package that defines a list of radio stations with defvar
(defvar default-list
'((station1) (station2)))
I want to redefine this list after loading the package (I am using require) because ...
0
votes
1
answer
46
views
Unexpected behavior when defining variable [duplicate]
I am trying to get the string value of a variable defined in a Python file and assign it to an elisp variable. The value is held in the variable org_file in a file config.py in the same directory as ...
- 4,923