Questions tagged [apply]
15 questions
4
votes
2 answers
apply partially last arg
Is there something like apply-partially
(apply-partially FUN &rest ARGS)
Return a function that is a partial application of FUN to ARGS.
ARGS is a list of the first N arguments to pass to FUN.
The result is a new function which does the same as…
JAre
- 175
- 5
3
votes
1 answer
Difference between apply and funcall
(describe-function apply) says:
apply is a built-in function in ‘src/eval.c’. …
Realraptor
- 1,253
- 6
- 17
3
votes
1 answer
Rewriting `defadvice' as `advice-add' makes advice ineffective
I am trying to make undo-tree auto compress the history save file. The document suggests adding the following advice
(defadvice undo-tree-make-history-save-file-name
(after undo-tree activate)
(setq ad-return-value (concat ad-return-value…
nalzok
- 665
- 6
- 18
2
votes
2 answers
Call apply with a macro
Is there a way to expand a macro using a list of arguments? I tried using apply but then I get an error that the "function" my/x-becomes-nil is invalid.
(defmacro my/x-becomes-nil (variable x)
`(if (eq ,variable ,x)
(setq ,variable…
Tohiko
- 1,589
- 1
- 10
- 22
2
votes
1 answer
Why can't I directly invoke the result of apply-partially?
I'm confused about return value of apply-partially. Documentation states that it returns a function, and source of the function shows that it actually retruns a lambda. But I can't invoke the return value directly, only via funcall. Creating lambda…
Rogach
- 267
- 1
- 5
2
votes
1 answer
Writing bytes to a file using library f.el
I'm trying to do something very simple, write bytes to a file using the f library:
(require 'f)
And I create a list of bytes:
(setq random-data (loop for i from 0 to 40 collect (random 150)))
So far, so good. However, the unibyte-string function…
Dave F
- 553
- 2
- 13
2
votes
1 answer
turn a list into a set of arguments for a function
I have a defun get-quotes with one mandatory and 2 optional arguments. I would like to do something like this:
(let ((articles
'("/home/matt/art/mice.pdf" '("/home/matt/art/cats.pdf" "Smith, "Neural Pathways in Cat Brains" 3)))
(dolist…
Matt
- 105
- 5
1
vote
1 answer
How can I apply function `max` to a list of numbers?
I want to find the max element in a list of numbers.
(setq l (list 1 2 3 4 5))
What is an easy way to call the max function on l?
So far I have this but this seems convoluted:
(eval `(max ,@l))
It seems like there should be an easier way. No?
jds
- 177
- 7
1
vote
1 answer
Use Elisp macro instead of two function arguments?
Is the following sort of shortcut macro possible to implement?
(defmacro region-end-beg ()
"Replacement for '(region-end) (region-begin)' in source code"
(...))
So that
(buffer-substring (region-end-beg))
(setq region-length (-…
user26109
- 11
- 1
1
vote
1 answer
Return Value of apply-partially
I'm playing around with apply-partially and I'm confused about what gets returned when calling this function. The documentation states that apply-partially returns a function, but then I'd expect to be able to do the following:
(defun add-numbers (a…
flooose
- 511
- 6
- 14
0
votes
2 answers
How to step into (apply ..) function when using Edebug?
When using edebug, stepping into a function call works.
But if I change the function call from
(foo args)
to
(apply '#foo args)
edebug says apply is built-in function and won't let me step into.
I can find the definition of foo and "instrument" it…
eugene
- 481
- 1
- 5
- 11
0
votes
1 answer
funcall/apply lambda
Please look at the following elisp expressions.
(funcall 'lambda '() 1)
;; or
(apply 'lambda '() 1 ())
The interpreter says that lambda is not a valid function for both the above expressions. Why? Is it because lambda is a macro? If so, is there a…
nomad
- 247
- 1
- 6
0
votes
1 answer
Source C code of function 'apply'
I referenced C-h f apply for the source code of "apply", it prompts
References
C code is not yet loaded.
but does not hint the destination file.
Execute grep-find within Emacs repo thus return no results.
find . -type f -exec grep --color -nH…
AbstProcDo
- 1,231
- 5
- 15
0
votes
1 answer
Apply of a logic function over a list
I'm trying to apply a logic function over a list, but:
e.g.(apply 'and some_list) give me Invalid function: and.
There is a way to apply a logical function to a list?
Francesco Cadei
- 327
- 3
- 17
0
votes
1 answer
How can I use a var to provide multiple arguments to a function?
Here is a simple example in which I would like to replace
(start-process "ls" "*temp*" "ls" "-l" "-a" "-t" "-r") ; this works
with
(setq some-var ????) ; <-- Need to figure this part out
(start-process "ls" "*temp*" "ls" some-var)
But I cannot…
Kaushal Modi
- 25,203
- 3
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- 179