Questions tagged [elisp-macros]
Emacs Lisp macros enable you to define new control constructs and other language features. A macro is defined much like a function, but instead of telling how to compute a value, it tells how to compute another Lisp expression, which in turn is evaluated to compute the value. We call this expression the "expansion" of the macro call. The macro call is first expanded and then evaluated, returning the value of that evaluation.
128
questions
0
votes
1
answer
21
views
List isn't considered a list within macro
(setq x 1)
(defmacro dowhile (body condition)
(cl-flet ((seq_eval (mylist) (cl-dolist (elt mylist result) (setq result (eval elt)))))
(seq_eval body)
(while condition (seq_eval body))))
(...
- 107
0
votes
1
answer
43
views
Is using if-let discouraged in emacs-lisp?
I wrote a piece of code using if-let. Later, when I tried to use my function, I got:
Symbol’s function definition is void: if-let
So I found that if-let is defined in subr-x.el and I need to use (...
- 1,235
1
vote
0
answers
48
views
Setf not expanding
I'm trying to modify a member of lsp--client after registration. So I have something like the following in use-package.
(message "%s %s" (symbol-function 'lsp--client-new-connection)
(...
- 211
3
votes
1
answer
271
views
What is the difference between `with-eval-after-load` and `eval-after-load`?
I wonder which one should I use.
Here are the definitions from Emacs:
with-eval-after-load is a Lisp macro in ‘subr.el’.
(with-eval-after-load FILE &rest BODY)
Execute BODY after FILE is loaded.
...
2
votes
1
answer
59
views
Macro breaks only in `eval-expression` (`M-:`)
I have a macro which unpacks a list into variables, as if by setq:
(unpack (a b c) '(1 2 3))
is roughly comparable to
(setq a 1)
(setq b 2)
(setq c 3)
The way I did that initially was by having the ...
- 256
0
votes
2
answers
46
views
difference between symbol-value and eval
(defmacro ek/bind-evil-keys-map (state keymap key-fn-list)
(let* ((key-fns (symbol-value key-fn-list))
(body (mapcar
(lambda (pair)
`(evil-define-key ,state ,...
- 489
0
votes
0
answers
36
views
flycheck thinks functions defined in a macro are not defined
i use a define-request macro to make it easier to define lots of requests to a REST API. each one returns a defun, the request function.
flycheck is unable to discover the existence of these functions....
- 508
0
votes
2
answers
142
views
How does a Lisp macro behave?
Have read that macro provide a way to perform transformations before the code is actually evaluated. When the macro is called, its arguments are passed to the macro as unevaluated forms. The macro ...
- 1
1
vote
1
answer
107
views
(apply #'and '(t t t)) is throwing an error. Why? [closed]
(apply #'and '(t t t))
gives me
Debugger entered--Lisp error: (invalid-function #<subr and>)
and(t t t)
apply(and (t t t))
while
(and t t t)
gives me t.
What am I missing?
This is with ...
user39778
1
vote
1
answer
75
views
Void variable when defining macro containing defvar in progn
I don't understand why I get (void-variable test-map) when trying to run:
(defun something--key-map (name)
(make-symbol (concat (symbol-name name) "-map")))
(defmacro defsomething (name)
...
- 13
0
votes
1
answer
64
views
How to use the same variable name with let when calling defmacro?
This is only an example, I understand this can easily be achieved with a function.
Don't Work
This is what I've come up with based on the elisp manual and a couple of answers/articles that I have ...
- 25
1
vote
1
answer
44
views
Can't setq a variable inside a macro
This is my first foray into emacs macros, so likely silly mistakes ahead: I'm trying to mimic the definition of pop (see the manual here), but I want to remove an element of alist indexed by key, ...
- 516
0
votes
1
answer
62
views
How do I use a while loop with a macro?
This works when I remove the loop but with the loop it does not
work.
(defmacro my/def-key (state map)
(let ((x '(
(kbd "<leader>z z") (lambda nil (interactive)(message ...
- 151
4
votes
1
answer
462
views
Bug in defmacro?
I think I found a bug in defmacro so I'd like to ask for confirmation before I make a fool of myself reporting something silly!
Here is how to reproduce it:
Define the following macro which simply ...
- 839
1
vote
1
answer
37
views
Is it possible to eval code as a transient group description?
I want to customize the title of a transient group based on the value of some variable, my--current-section. The following doesn't work
(transient-define-prefix my--prefix ()
"Sample docstring&...
4
votes
3
answers
577
views
Does emacs have compiled/interpreted mode?
So I define a macro (defmacro macro-print (str) (print "hi") and then run
(let ((i 0))
(while (< i 3)
(macro-print i)
(setq i (+ 1 i)))
according to the Elisp manual, the ...
- 143
0
votes
2
answers
215
views
How to fix byte compiler warnings for "Unused lexical variable" in a macro?
I have a macro and a function which uses it:
(defmacro oauth2-auto--query-case (&rest cases)
"Handle HTTP queries based on the keys present in ‘query-alist’.
‘query-alist’ is a free ...
- 253
0
votes
2
answers
53
views
Dynamic Keybind Without Use of Macro
I've attempted to make a function which binds the leader keys o f to switch to the current buffer:
(defmacro bind-current-file ()
(list 'spacemacs/set-leader-keys
"of"
(...
- 889
1
vote
0
answers
55
views
Org-mode expands org-special-block-extras incorrectly
I've been using org-special-block-extras to insert special blocks in org-mode which I then export to PDF through LaTeX, things such as margin notes or colored blocks.
It used to work until recently (...
- 279
2
votes
1
answer
158
views
How can I automate rescheduling overdue daily tasks?
I have a number of "daily" tasks which repeat daily. If I forget to mark each task as DONE, it is removed from the timeline, and appears as an overdue item at the top of the agenda. For ...
- 73
0
votes
0
answers
37
views
How to convert greek text to unicode using matching input method?
Good evening,
I have a large TeX-file with Greek inclusions in traditional babel way: \textgreek{sunj'hkh|}. I would like to convert it to unicode for further work. Emacs has greek-babel input method,...
- 101
3
votes
2
answers
213
views
Create a function that returns a new function definition
I'm creating a modular system for my use of Emacs, so I can call modules on the fly, as I need them. Just like a lazy call, but I must explicitly call them.
Anyways, I found this riddle, I want a ...
- 267
0
votes
1
answer
168
views
How to define multiple key bindings more concisely?
I'm trying to write a helper macro to conveniently define keybindings in my configuration file.
The idea is to replace the following configuration entry:
(use-package org-roam
:config
(define-key ...
- 103
1
vote
1
answer
113
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
128
views
How do you find all macro calls in an elisp file?
I am trying to make sure a package that is installed from Melpa (org-ref) byte compiles correctly, and a typical issue is related to the use of macros. For example, if I use org-with-wide-buffer which ...
- 11.6k
1
vote
2
answers
215
views
Count number of lines between two consecutive matches
I have files such as these:
0000
0030
+ Something
+ Another thing
+ One more thing
0200
+ Something else
+ And one more thing
0230
In the above, the numbers represent time in HHMM format. I want to ...
- 298
4
votes
1
answer
295
views
eval-when-compile and eval-and-compile identical definitions?
How can eval-when-compile and eval-and-compile have different behavior if their definitions are identical?
From byte-run.el:
(defmacro eval-when-compile (&rest body)
;; ... documentation string ...
- 1,938
1
vote
1
answer
131
views
special form or macro? eval-when-compile, eval-and-compile
Is eval-when-compile a special form (primitive in C), or a macro?
According to the elisp manual, C-h S eval-when-compile RET,
Special Form: eval-when-compile body...
But according to C-h f eval-when-...
- 1,938
2
votes
1
answer
147
views
Can a defmacro generate a string with the name of the .el file where it is expanded?
I'd like to create a Emacs Lisp macro that is able to generate a string literal that contains the name of the .el file into which the macro is expanded. Is this possible?
Background:
I am writing a ...
- 786
0
votes
1
answer
62
views
Issue with macro and `buffer-name`
I want to write a macro that makes a diffpdf before and after some changes in my LaTeX file (that would be compiled twice by pdflatex).
I tried:
(defmacro with-diffpdf-after-changes (&rest body)
...
- 1,235
2
votes
2
answers
383
views
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 ...
- 1,609
1
vote
1
answer
41
views
How to investigate defmacro* (with asterisk) error on an old emacs package
I'm trying to load the defhook package without success. The code defines a macro using defmacro* (with the asterisk at the end), and I can't find any info about it. (The fact that the '*' is ignored ...
1
vote
0
answers
55
views
Navigating to a `defconst` variable defined by a Lisp macro
My goal is to define a const variable within a non-trivial macro that can be navigated to after calling describe-variable.
The design goal of my macro works just fine if I define it like so:
(...
- 550
1
vote
2
answers
200
views
Evaluate docstring in macros
Macros like defun (or defmacro itself) have an optional docstring argument, but since they are macros and not functions, docstring isn't evaluated, but is taken as-is.
I need the docstring to be ...
- 247
2
votes
1
answer
204
views
How to properly generate a concat'd function name with defmacro?
I have a macro like this:
(defmacro my-fun-generator (x)
`(defun ,(intern (concat "fun-" x)) ()
,(concat "Print " x)
(interactive)
(print ,x)))
This works (found ...
- 23
1
vote
2
answers
176
views
Macro definition
I'm in the process of "modularizing" my config file and ran into a problem involving elisp macros.
Because of the way in which I'm defining my configuration modules, I ended up with a bunch ...
- 316
0
votes
1
answer
557
views
compilation sentinel: symbol's value as variable is void for quote, >, <, =, etc
I'm working on a script that can compile multiple directories and then provide the first error to a file. Currently, I am tackling the issue of running make in multiple directories portion. I am ...
- 123
1
vote
1
answer
408
views
How to code a command to `write-region` to a particular file?
I have a system that I am not allowed permissions to install software but need to copy text from the remote server to the host computer's system clipboard. Because I can't install xclip or xsel and I ...
- 123
3
votes
1
answer
199
views
Inconsistent behavior when calling #'funcall with a macro
I would have thought that both of the funcall's the follow would have yielded the same result, but they don't and I'm trying to understand why.
(defmacro test/z () "z")
(funcall (function test/z)) ;;...
- 80
1
vote
0
answers
47
views
Autodocument function for C Code
Suppose i have this line of code presenting a C function prototype:
int sum_Func(int a, int *b)
I want an Emacs lisp function that adds the function description (initialization) according to its ...
- 11
1
vote
1
answer
98
views
why is switch-to-buffer effect not visible immediately when called in a list with other functions?
I have a key bound to some program which prepares a buffer, switches to it via switch-to-buffer and afterwards calls some function which modifies the buffer (and can take a few seconds to execute).
...
- 13
1
vote
1
answer
870
views
Working with printed macro expansions
I am trying to write a macro. I have read the manual and learned about macroexpand. However, when I use it, I find the expansion difficult to read and work with.
How can I expand a macro in a ...
- 4,407
0
votes
1
answer
34
views
How to use a macro append macro argument to a list?
I want use a macro to generate a package list.
(defvar xx-packages '())
(genpack evil)
(genpack all-the-icons-ivy-rich
:recipe (:host github :repo "seagle0128/all-the-icons-ivy-rich"))
this ...
1
vote
1
answer
134
views
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-...
- 11
0
votes
1
answer
595
views
Is there a clean way to splice some args to an existing Lisp macro?
I have the following non-working elisp code:
(use-package eglot
;; For debug/testing, load local copy of eglot if it exists
,@(if (file-directory-p (concat user-emacs-directory "/...
- 496
1
vote
1
answer
262
views
Making a dynamic, interactive function
I have make a macro that creates dynamic functions:
(defmacro tjb-make-register-macro (func-name out-string)
(list 'defun func-name () '(interactive) (list 'insert out-string)))
;; This call ...
- 197
1
vote
0
answers
61
views
does this routine exist? until (while until true)
I found myself needing this control loop and was very surprised not to find it in the standard library. Does it exist by some other name?
(defmacro until (form &optional guard)
"Runs `while' on ...
- 1,760
1
vote
1
answer
170
views
How do you remove compiler warnings for macro usage when running macro with 'with-eval-after-load'?
In a package I am working on I want to define a flycheck checker only if the user has flycheck installed already. To do this, I am using the macro (with-eval-after-load "flycheck" ...) as follows:
(...
- 175
4
votes
3
answers
333
views
How do I get byte-compilation warnings about undefined variables?
The following code works fine with M-x eval-buffer, and byte-compiles without any warnings.
(eval-when-compile
(defconst demo-one 1))
(defvar demo-some-var
`(foo bar ,demo-one))
However, if I ...
- 6,910
8
votes
1
answer
427
views
Evaluate some arguments to macro immediately
I am trying to call a macro (defined somewhere else; I can't change it), but I want to evaluate some of the arguments before the macro is expanded. Is this possible?
For example:
(defmacro foo (&...
- 329