Questions tagged [defcustom]
33 questions
17
votes
2 answers
How to properly use defcustom?
Like most Emacs users I've customized a mode by changing the variables. What never occurred to me is the whole programming mentality behind having customizable this-and-that. I realized this when I started looking at some of the source code for…
147pm
- 2,907
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10
votes
1 answer
What is a hook?
Just to clarify... For example, in this doc:
A hook is a Lisp variable which holds a list of functions, to be
called on some well-defined occasion. (This is called running the
hook.) The individual functions in the list are called the hook
…
147pm
- 2,907
- 1
- 18
- 39
7
votes
2 answers
init.el and trampling of custom-set-variables
My new init.el uses require to load various settings that I have organised into directories and files. This is an attempt to tame what was a very large and messy init.el and custom.el file. Also I ultimately hope to use org files to better…
Phil
- 533
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4
votes
1 answer
How to overwrite a defcustom of a package within the initfile?
I have an installed packages (say mypackage.el) in \.emacs.d\lisp\ directory. In that package there is
(defcustom xyz "path1" "Path to the program"
:group 'blablabla
:type 'string)
I would like to change the above as
(defcustom xyz "path2"…
Name
- 7,689
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- 38
- 84
4
votes
1 answer
Autoloading defcustoms: good practice or not?
In my init file, I often find myself trying to set a customizable variable before the file (usually a mode of some sort) is loaded. This, of course, results in an error.
While this problem could be addressed through use-package and other means, it…
Tianxiang Xiong
- 3,848
- 16
- 27
4
votes
2 answers
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 keyboard.c via defvar_lisp, but the following…
ivan
- 1,928
- 10
- 20
4
votes
2 answers
defcustom values for selecting from function call?
I have definition:
(defvar my/python-checker-alist
'((pylint . (my/python-pylint-command my/python-pylint-args))
(pep8 . (my/python-pep8-command my/python-pep8-args))
(pyflakes . (my/python-pyflakes-command my/python-pyflakes-args)))
…
gavenkoa
- 3,352
- 19
- 36
3
votes
0 answers
How to define a "composite type" with the "group" constructor?
I am trying to define a composite type using the "group" compositor (see Elisp Manual, section "Composite Types"). Previously, I managed to define a composite type with the "list" constructor.
The Elisp manual tells that these constructors ("group"…
user19761
3
votes
1 answer
Put a constraint on defcustom with variable type
I have a defcustom with :type variable,
and I would like to constrain the variable name to comply to a pattern.
How would I do that?
for instance let say I want the custom to only accept a variable name starting with some prefix.
AdrieanKhisbe
- 209
- 1
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2
votes
1 answer
Defcustom definition for plists
I want to write a defcustom definition for a variable my-var.
my-var is an alist that maps strings to plists. Each such plists maps one of three keys (:x, :y, :z) to a list of strings. So, a member of my-var could be:
'("key" . (:x '("a" "b") :y…
efl
- 83
- 5
2
votes
1 answer
How to make defcustoms available before their file has been loaded?
I maintain an Elisp package that is split over many files, and each of the files has its own group of defcustoms in it, as a subgroup of the main package name.
I am unsure of how to make these defcustoms available before the specific file has been…
user27075
- 488
- 3
- 11
2
votes
1 answer
How to properly specify defcustom default list of heterogeneous types?
How to properly write the default value for a non-trivial defcustom form for something like I have below: a list of 3-element lists, with choices of the types?
The defcustom form is: defcustom option standard doc [keyword value]...
The following…
PRouleau
- 744
- 3
- 10
2
votes
1 answer
How to create a defcustom variable that accepts only a vector of strings?
I am using repeat for now. But I don't know how to have the same for vector.
EDIT: I want INS and DEL options like in repeat.
Compro Prasad
- 67
- 11
2
votes
0 answers
How to translate between custom choice type and widget items?
I have a custom variable
(defcustom myvar ....
:type '(choice (const :tag "foo" 1) ...))
and I need to map it to
(widget-create ...
'(item :tag "foo" :value 1)
...)
Obviously I can write something like
(mapcar…
sds
- 5,928
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- 39
2
votes
1 answer
What is the recommended way to generalize a defcustom from atom to sequence?
In an Emacs package I have a defcustom, say custom-string, that is defined as an atom of type string like so:
(defcustom custom-string "foo"
"A customizable string."
:type 'string)
I need to generalize the variable so that it can be a sequence…
Jason Blevins
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