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.
135
questions
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1
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38
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Using macros to define functions through fixing another function's argument
I'm writing a lot of LaTeX-files and to improve the process I'm trying to give each environment a background tinge. So I wrote a list of tuples of environment types and faces, daselt-latex-colored-env-...
0
votes
1
answer
33
views
Macro works with direct argument, but not when argument is set using "let"
Take this macro definition:
(defmacro useless (digit)
(let ((str-digit (number-to-string digit)))
`(message ,str-digit)))
It works when I call it directly, with a number as argument:
(useless 2)...
- 13
0
votes
1
answer
38
views
How to correctly define functions with defun inside a macro?
I have the following code (built following my previus question https://emacs.stackexchange.com/a/80426/15606):
(defvar my-list
'(("my-function-one" "Message 1")
("my-...
- 1,680
1
vote
2
answers
83
views
Getting the source file line number of the currently executing init file expression (formerly: Malformed macro)
I wrote this macro for my .emacs file to trace its progress during loading:
(defmacro checkpoint ()
`(message "Reached line %i" (1+ `,(current-line))))
So I placed
(checkpoint)
...
0
votes
2
answers
44
views
custom defconst
I'm trying to build a function that is a wrapper around defconst so that creation of a constant automatically gets logged in my log file. However, I can't figure out how to pass a string in a variable ...
0
votes
1
answer
74
views
Generate keyword symbols
I like to convert an alist within a macro call to a list of keyword symbols and corresponding values. E.g. given a macro make-test and an alist `((a . 1)(b . "cool")) I want to obtain a ...
- 207
0
votes
2
answers
98
views
Defmacro: Create functions from a list o functions
I have this code:
(defmacro with-ignore-mouse-events (&rest body)
"Macro to ignore mouse events before evaluating BODY."
`(progn
(when (input-pending-p)
(let ((event (...
- 1,680
0
votes
1
answer
54
views
Macros expanding to addhook
I have the following configuration lines in my init.el file regarding a specific mode:
(add-hook 'pdf-view-mode-hook (lambda () (local-set-key (kbd "SPC h") #'evil-window-left)))
(add-hook '...
- 341
0
votes
1
answer
30
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))))
(...
- 121
0
votes
1
answer
99
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 (...
- 1,680
1
vote
0
answers
69
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
664
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
78
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 ...
- 576
0
votes
2
answers
64
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 ,...
- 519
0
votes
2
answers
268
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
144
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
109
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
96
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
52
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
101
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 ...
- 169
4
votes
1
answer
476
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 ...
- 849
1
vote
1
answer
55
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
609
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
330
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
57
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"
(...
- 939
1
vote
0
answers
88
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
199
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
47
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
5
votes
2
answers
399
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 ...
- 307
0
votes
1
answer
207
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
138
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
134
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 ...
- 12k
1
vote
2
answers
230
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 ...
- 318
4
votes
1
answer
335
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 ...
- 1,948
1
vote
1
answer
159
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-...
- 1,948
2
votes
1
answer
177
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 ...
- 831
0
votes
1
answer
67
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)
...
- 1,680
3
votes
2
answers
530
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 ...
- 1,659
1
vote
1
answer
45
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
59
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:
(...
- 610
2
votes
2
answers
247
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 ...
- 257
2
votes
1
answer
241
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
193
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 ...
- 326
0
votes
1
answer
639
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
533
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
227
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
110
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
1k
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 ...
- 4,547
0
votes
1
answer
44
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 ...
