Questions tagged [elisp-macro]
12 questions
3
votes
3 answers
Why does a macro inside a loop only expand once in Elisp?
Let's say I define
(defmacro macro-print (str)
(print "hello"))
and run
(let ((i 0))
(while (< i 3)
(macro-print i)
(setq i (+ 1 i))))
The output is
"hello"
nil
why is this?
I was expecting to see 3 hellos. This is because, according…
Isabella
- 167
- 3
3
votes
4 answers
Elisp use apply on progn for list of functions
I am a new emacs user. And trying to write some Elisp to learn this software better. While I meet some problems.
I want to use apply on progn to run a list of functions in sequence. But I got errors as below. I am just confused and need some help to…
Xiong chenyu
- 135
- 1
- 9
2
votes
1 answer
How does macroexpansion actually work in Lisp?
I would like a more detailed explanation of how macro expansion works, at least in Emacs Lisp but an overview of other Lisps would be appreciated. The way I usually see it explained is that the arguments of the macro are passed unevaluated to the…
Isabella
- 167
- 3
2
votes
2 answers
Elisp: defmacro with &body and &rest behave differently?
I thought &body and &rest were supposed to behave the same, so this puzzled me:
ELISP> (defmacro mrest (&rest rest)) …
John Graham
- 135
- 6
2
votes
1 answer
How to give a list as arguments to a macro in elisp?
I want to achieve something like this:
(setq my-global-keybindings
'(([?\C-x ?\C-d] . dired)
([?\C-x ?\C-b] . ibuffer)
([?\C-x b] . ivy-switch-buffer)))
(apply #'bind-keys* my-global-keybindings)
But bind-keys* is a macro…
godblessfq
- 218
- 1
- 10
1
vote
0 answers
Getting request-default-error-callback when attempting a post request with request.el in emacs lisp?
I am trying to use request.el to make a simple post request in elisp to my API, running on localhost. Here is the request in restclient.el format that I am trying to make in elisp using request.el:
POST…
TheDarkHoarse
- 416
- 4
- 9
1
vote
3 answers
Is defining unnamed macros possible? ("lambda" macros?)
My goal is to evaluate an expression at compile time, like some simple things as (+ 1 1). But, I would like an integer "2" to be compiled in, instead of a full "1+1" operation to be done at runtime, without using a named macro. This makes my source…
Luke Lee
- 261
- 3
- 11
1
vote
2 answers
Emacs Lisp Macro Does Not Expand Alist
Here's my macro, what it is supposed to do is to wrap a body in let with bindings from vars-alist
(defmacro with-vars-alist (vars-alist &rest body)
`(let (,@(mapcar (lambda (cell) (list (car cell) (cdr cell))) vars-alist))
,@body))
When I am…
EvgeniySharapov
- 3,078
- 3
- 27
- 38
0
votes
1 answer
Lisp - "list 'if x y nil" what is usage of the tick (') symbol and "list" function here?
I am taking a programming language principle class where the professor talks about macro using Lisp (Precisly, Elisp). However, he didn't teach us how to write this language. As a result, I am trying to learn myself.
However, there are something…
Yan Zhuang
- 436
- 3
- 10
0
votes
2 answers
How to prevent macroexpand-all to skip first form in list?
I am trying to expand all macros inside a nested list structure.
macroexpand-all almost works, but skips (does not expand) the first form in every nested list.
I am using this as a template-mechanism for org-agenda-custom-commands. I can generate…
bitclick
- 1
- 2
0
votes
1 answer
Nested macros for defalias don't work, but macroexpand output works? - Emacs Elisp
I'm trying to implement user command aliases with a customizable prefix for my package. I wrote two nested macros to accomplish this. The trs-defalias-from-suffix macro returns the correct value as if an alias was created, but none exists when I…
Cyberthal
- 103
- 3
0
votes
1 answer
How to use local variable in Elisp defmacro?
I write a elisp macro in my configuration file of emacs, but like something shown below ,(intern (format "%s-display-table" name)) is used several times, how can I use a something like variable to represent it?
;; Change the glyphs of "wrap",…
Johnson
- 3
- 1