Questions tagged [variables]

for variables in Emacs Lisp, which are symbols with values. The symbol’s name is also called the variable name. Most variable names, by convention, consist of lowercase, ordinary words separated by hyphens.

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42 votes
2 answers
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How to evaluate the variables before adding them to a list?

The below obviously doesn't work and hence this question. How do I correct the below code so that the value of somelist becomes '(("abc" . 123)) ? (setq x "abc") (setq y 123) (setq somelist nil) (...
Kaushal Modi's user avatar
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7 votes
4 answers
367 views

Tracking when variables get updated

I have a problem with org-mode's agenda view. While I've set org-agenda-files to '("~/org/") invariably when I finally spin up M-x org-agenda I find that org-agenda-files just points to one org-file. ...
stsquad's user avatar
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31 votes
3 answers
5k views

Reset custom variable to default value programmatically

Q: Using Elisp, how can I reset a variable to its default value without knowing what that value is? I tried to figure out how to do this by bringing up the Customize interface for a variable I set to ...
itsjeyd's user avatar
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11 votes
2 answers
4k views

How to include other .org files programmatically (ie not from main .org file)?

Including other .org files is quite easy. For example, for configuration, #+setupfile: /path/to/config.org or #INCLUDE: /path/to/config.org Those lines need to be in the .org file in order to be ...
gsl's user avatar
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6 votes
1 answer
1k views

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 (...
user1943733's user avatar
6 votes
2 answers
291 views

Are there any libraries in Emacs or the wider package system for automatically persisting variables

I have a number of variables that store useful state that would be nice to persist across restarts of Emacs. Are there any libraries that allow this to be done simply so I can avoid a bunch of ...
stsquad's user avatar
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5 votes
1 answer
3k views

Error void-variable on function name

What is the difference between the two functions func1 and func2? (defun func1 (arg) (if (listp arg) (mapcar (lambda (x) (func1 x)) arg) arg)) (func1 (list 1 2 3)) (defun func2 (arg) (...
ceving's user avatar
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1 vote
1 answer
486 views

"require ('org-journal')" creates "Symbol's value as variable is void: require"

I added require ('org-journal) to my .emacs. Now I get the error message: 'Symbol's value as variable is void: require', when emacs is started. Without require ('org-journal) there is no error message....
tester's user avatar
  • 473
0 votes
4 answers
246 views

How to make changes on variables' values be persistent over sessions?

The current question is related to a previous question which is still not fully solved. I have been doing the following: 1 - After executing describe-variable over exec-path, I get: ("/opt/...
Pedro Delfino's user avatar
34 votes
2 answers
12k views

what does "let*" ( let asterisk) mean in elisp

I've used let before, but never used let* what does let* ( let asterisk) mean in elisp? fyi this one was hard to google because of the asterisk.
american-ninja-warrior's user avatar
14 votes
3 answers
3k views

Assigning same value to multiple variables?

Sometimes I need to set same value to multiple variables. In Python, I could do f_loc1 = f_loc2 = "/foo/bar" But in elisp, I am writing (setq f_loc1 "/foo/bar" f_loc2 "/foo/bar") I am wondering ...
Chillar Anand's user avatar
11 votes
1 answer
2k views

Color declared variables

I'm looking for a simple way to make emacs remember of declared variable in a single function in C/C++. By "simple", I mean without any external package, just with some elisp lines in configuration ...
Aracthor's user avatar
  • 173
10 votes
0 answers
2k views

Display all local variables within a edebug session

When using edebug one can get a local variable by command describe-variable (C-h v), but are there any ways to display all local variables? For example in Python you can call locals() in a pdb ...
atevm's user avatar
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7 votes
1 answer
1k views

Define a function alias within a let binding?

How can I define an alias within a script with let-binding? I tried (let (b-s) (defalias 'b-s 'buffer-string)) But it doesn't work. I figured out to let-bind the variable where aliases as stored ...
Gabriele Nicolardi's user avatar
6 votes
2 answers
496 views

What does customize: Set for Current Session do?

I have a variable that I want to switch between two different values and have it apply for the whole session. I'm able to do this using M-x customize-variable and picking "Set for Current Session". ...
Jim Hunziker's user avatar
6 votes
1 answer
685 views

I'm unsure which option to use for setting a variable: setq, customize-set-variable, or setopt

I'm a bit uncertain about which method to use for setting a variable: setq, customize-set-variable, or setopt. I did some research online, and it seems that opinions on this matter are quite varied. ...
Zoli's user avatar
  • 421
5 votes
3 answers
391 views

Set (non-custom) variable to its initial value

Is there a (quick) way of resetting a variable to its default value (as defined in some .el file) after it has been modified? e.g. via commands in the .emacs file, without having to restart emacs. ...
cass's user avatar
  • 53
5 votes
2 answers
2k views

How do I insert code block header :var in exported code block in org-mode

GNU Emacs 26.0.50.2 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9) of 2016-10-06 Org-mode version 8.3.5 (release_8.3.5-1131-g7eecb2 @ ~/.emacs.d/el-get/org-mode/lisp/) I have come to share my projects as ...
Sparx's user avatar
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4 votes
1 answer
246 views

Make a variable visible to some functions only

Consider the following metacode: ;;; -*- lexical-binding: t -*- (defvar var1 ...) (defvar var2 ...) (defun main () "Main entry point" ...) (defun func1 ...) (defun func2 ...) ... (defun funcn ...)...
antonio's user avatar
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4 votes
2 answers
1k views

Should "custom" variables defined without defcustom be set via custom-set-variables or setq?

Should I use custom-set-variables (as opposed to setq) when setting a variable that returns non-nil for custom-variable-p but was not defined by defcustom? For example, echo-keystrokes is defined in ...
ivan's user avatar
  • 1,938
4 votes
1 answer
94 views

Per-host background colour

Having got a bunch of custom colors defined (thanks to Drew), I need to use them to customize the background color per host. I have named the colors after the hostname, eg (setq pentacle "#314159") (...
Peter Flynn's user avatar
3 votes
1 answer
231 views

practical relevance of storing value and function into one symbol

With Emacs Lisp it is possible to store a value and a function within the same symbol. (setq foo 6) (defun foo () (message "blah %d" foo))) Then you can do: (symbol-function 'foo) which returns the ...
jue's user avatar
  • 4,556
2 votes
3 answers
2k views

Insert the value of a variable into the buffer I'm editing

I asked How can I script emacs to install packages from list? and got this answer. (setq package-selected-packages '(async epl evil goto-chg helm helm-ag ...
vfclists's user avatar
  • 1,383
1 vote
2 answers
509 views

Is there a way to spread a list like in Typescript or Golang?

I have a variable with some common values between dap-mode debug templates and I want to use that variable along with other cons elements for :environment-variable in languages like Golang or ...
shackra's user avatar
  • 2,772
1 vote
2 answers
99 views

Why changing the value of this variable via add-to-list is not working?

Usually, I do the following to change a variable's value: 1 - I execute the command set-variable 2 - I pick cider-shadow-cljs-command 3 - I tweak the value changing it to be "shadow-cljs" It ...
Pedro Delfino's user avatar
0 votes
1 answer
253 views

How to enable a minor mode immediately after a buffer is open?

I have been using a pdf-tools fork with a image-roll.el support, this fork and file make it possible to scroll continuously from the end of a page to the beginning of the other without jumping from ...
user38135's user avatar
0 votes
0 answers
61 views

helm-comint-input-ring - get error: shell-mode-map

windows 10, emacs 26.1, helm 3.0 I use C-c C-l (comint-dynamic-list-input-ring) I get something like this: But I don't like this. I want to use helm-comint-input-ring. I want to get something like ...
a_subscriber's user avatar
  • 4,010