Questions tagged [prefix-argument]

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Maintaining prefix argument sensitivity: wrapping functions in emacs minor mode menus

I have a set of functions, some of which accept a prefix argument: (defun prefix-arg-test (&optional prefix) (interactive "P") (if prefix (message "prefix") (...
Gabriele's user avatar
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general.el definer send universal-argument

Given a definer, for example: (general-create-definer test-def :states '(normal insert motion emacs) :keymaps 'override :prefix "SPC") (test-def "" nil "f"...
user615536's user avatar
2 votes
1 answer
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Composing Prefix Commands

There are several commands in Emacs that work as prefixes to other commands, changing the behavior of the next command in some way. The most well-known example is the commands that set up the "...
mtraceur's user avatar
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6 votes
2 answers
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Insert multiple minus ('-') characters using the universal argument (C-u)

I was manually creating a table in my source code's multiline comments and inserting horizontal separators using - and =. E.g. C-u C-u C-u = as expected and inserts 64 =s at the point. But - is used ...
loonatick's user avatar
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How to pass the prefix argument using a list in the `interactive` clause of a command definition?

How can I use prefix argument with list in the interactive clause? It is the more general way instead of Code Characters.
Dilna's user avatar
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Getting prefix as argument

With this function, I get the error test: Wrong type argument: stringp, 2 Is it good to pass prefix this way? Thought that the argument prefix would be filled up with the prefix value. (defun test (...
Dilna's user avatar
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Using current prefix argument value

I am doing a test with the current prefix argument to perform different tasks depending on the value of the current prefix argument. I have a few questions. Does (interactive "P") require ...
Dilna's user avatar
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2 votes
2 answers
302 views

Can there be two prefix arguments?

I am very confused by the definitions of define-skeleton and skeleton-proxy-new in skeleton.el in the emacs source (version 28.1). The command generated by the define-skeleton macro has the ...
q.undertow's user avatar
1 vote
1 answer
142 views

How can I get the name of the file on the current Dired line?

I'm running emacs on WSL. The following function launches the binary file marked in dired: (defun wsl/execute () "execute file at point in dired" (interactive) (dired-do-shell-command ...
eatloaf's user avatar
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2 votes
1 answer
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How to define key-combinations involving multiple `C-u`s

I wanted to define a short key combination for preview all latex fragments in a org file. Per this answer: To preview all latex fragments in the buffer pass C-u twice before calling org-latex-preview....
tinlyx's user avatar
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4 votes
2 answers
442 views

What is the difference between `C-u C-c C-l` and `C-c C-l`?

C-c C-l points to org-insert-link. In the minibuffer I am ask for a link type, link url and description. But C-u C-c C-l shows me dired-like folder structure in the minibuffer and I can navigate to an ...
buhtz's user avatar
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3 votes
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Are the Control & Meta "digit argument" bindings duplicates?

As far as I can tell the Meta and Control digit-argument bindings (C-1, C-2, C-3, M-1, M-2, M-3) are duplicates. There are so few single-modifier, single-key bindings available, it seems like a ...
Oliver Taylor's user avatar
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0 answers
109 views

How to define absolute directory paths and use them as file prefixes in org files

I need to represent absolute paths to several directories by some constant names to use them as prefixes in org mode for a number of files contained in each of these directories. For instance they ...
P. Daegelen's user avatar
4 votes
1 answer
48 views

Using a number in register as prefix argument

How can I use a number in a register after C-u ? For example my register looks like 1: 24, and I want to do C-u 24 x.
Faruk Akın's user avatar
2 votes
1 answer
256 views

How can I pass an expression to a prefix argument?

Sometimes it would be useful to be able to pass an expression to a prefix argument, for example c-u 3*4 c-n If I try the command above though it will print three asterisks followed by the '4' ...
Georgina Davenport's user avatar
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Behavior of universal-argument (C-u) changed between org 9.1.9 and org 9.4?

Running org version 9.1.9, when invoking C-u C-c C-t (org-agenda-todo) I get a completion list of my status values that I can select from. In org version 9.4 the same call no longer allows me to ...
stand's user avatar
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6 votes
2 answers
993 views

How to specify prefix argument in key binding

The description of C-x C-e mentions: ...Interactively, with a non '-' prefix argument, print output into current buffer. I understand this to mean this logic is triggered when I issue C-u C-x C-e, ...
mcp's user avatar
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3 votes
1 answer
305 views

Assign a function with universal argument to a key (org-timer-start)

I would like to assing the function org-timer-start with a univeral argument (Ctrl-u) to its own key. I read here, that one should look into the source code of a function to find out how to pass a ...
breathe_in_breathe_out's user avatar
6 votes
1 answer
300 views

How to rebind "special meaning" of C-u to a different key?

Excerpt from GNU Emacs manual: C-u alone has the special meaning of “four times”: it multiplies the argument for the next command by four. C-u C-u multiplies it by sixteen. Thus, C-u C-u C-f moves ...
Rogach's user avatar
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1 answer
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Treat initial numbers as argument to functions in minor mode

Is it possible to treat typed numbers similar to universal argument C-u 10 C-n, but make it so that there is no need to type C-u in a minor mode? So only 10 C-n would be needed to move 10 lines down ...
phoxd's user avatar
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4 votes
3 answers
645 views

Use cases for M-0 & C-0?

The purpose of digit-argument and how to use them is described in Emacs manual. Also read a question that asks how to disable them. Even though have not disabled them, I have changed M-1, M-2, M-3 '...
nephewtom's user avatar
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1 vote
1 answer
92 views

How to write a command which uses the prefix argument AND some strings

I want to write a command which uses a prefix argument and reads some strings. I know both parts individually: (defun xtest(arg) (interactive "P") ... reads the prefix arg. (defun xtest(t1 ...
halloleo's user avatar
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4 votes
1 answer
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How to bind 'C-u M-x shell' to 'C-c s'? [duplicate]

I would like to define the keybinding C-c s which should start a new shell in the current directory (so C-c s should behave like C-u M-x shell). I know how to define a keybinding based on a function (...
Marius Hofert's user avatar
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1 answer
59 views

Given a keyboard command, how do you find the interactive function? [duplicate]

I have a key sequence for C-u C-c . How would I find the function that's bound to it. I thought it was describe-key but that doesn't seem to work. Cheers
Justin Thomas's user avatar
2 votes
0 answers
988 views

What does C-u mean in sequence "C-u M-x"

I learnt that C-u default is to repeat 4 times. For example: C-u t is input tttt However, when I type C-u M-x, it prompts a function list What does invoking C-u mean here?
user10726006's user avatar
2 votes
1 answer
399 views

how to implement a numeric prefix argument in emacs

When I press "d", this loop runs 52 times. How can I adjust this elisp so that, I can specify a number instead of harcoding 52. I guess I'm trying to do something like " C-u -1 C-x ^" mentioned at ...
american-ninja-warrior's user avatar
2 votes
1 answer
367 views

Find out about arguments passed to functions

When I press C-h k C-SPC, Emacs shows me: C-SPC runs the command set-mark-command (found in global-map), which is an interactive compiled Lisp function. It is bound to C-@, C-SPC. (set-...
UTF-8's user avatar
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1 answer
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"C-3" vs "C-u 3-" in spacemacs

I'am using spacemacs and I was reading this 5.2.1 TODO keywords as workflow in the org manual and it says that to set a specific state right way the sequence of keys C-3 C-c C-t can be used. If I ...
plx's user avatar
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1 answer
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key binding for disabling column-marker

In my .emacs I have the following: (progn ; (defvar my-keys-minor-mode-map (let ((map (make-sparse-keymap))) ; other bindings .. (define-key map (kbd "C-c c" ) 'column-marker-3) ...
Marcus Junius Brutus's user avatar
3 votes
1 answer
110 views

What's the difference between C-u C-u C-u <Command> and C-u 64 <Command>?

In org-mode, C-u C-u C-u Tab expands all trees. When I wanted to check what it's bound to, I wasn't able to do that using C-h k as it quickly told me what C-u is bound to. From experiments, I know ...
UTF-8's user avatar
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0 votes
1 answer
68 views

What function are associated with these expression evaluation commands in buffers?

What are the function names for these two bindings? C-o C-x C-e - evaluate expression before cursur and display limited length result in echo area C-u 0 C-x C-e - evaluate expression before cursor ...
vfclists's user avatar
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1 vote
2 answers
158 views

how does optional argument `ALLOW-EXTEND` in `mark-word` work?

I am switching from VIM to Emacs for just a couple weeks and trying to write some Elisp. Having difficulties to adapt, I am exploring different options to do marking and reached this function. (defun ...
Jason Hu's user avatar
  • 201
3 votes
0 answers
131 views

Replace formula by computed value

I'd like to select a simple formula like 17+5 and replace that by the computed result, 22 in this case. And I need this to work during keyboard macro execution, to quickly process large portions of my ...
MvG's user avatar
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2 votes
2 answers
255 views

Finding possible prefix arguments

Emacs is aweseome but sometimes it feels it's too smart for its own good. You may feel you learned everything there's to know about a function and then someone tells you to try a prefix argument and ...
iLemming's user avatar
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9 votes
1 answer
470 views

How to describe a key sequence that starts with `C-u`?

I am trying to use C-h k to describe the function to which a key is bound. But when I use it with a key chord like C-u C-e C-x it retrieves the documentation for C-u before I can finish typing the ...
lookyhooky's user avatar
0 votes
1 answer
110 views

Differentiating between raw prefix arguments

Is there a way to differentiate between different numbers of raw prefix arguments (e.g. C-u vs. C-u C-u) aside from checking whether the argument is (4), (16), etc.? This seems to be what packages ...
Tianxiang Xiong's user avatar
13 votes
1 answer
2k views

How to apply `call-interactively` to an interactive command that accepts the universal argument?

I've read the documentation on how to make interactive calls from within Elisp, but I still can't figure out how to pass the universal argument when using call-interactively on a command that ...
kjo's user avatar
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2 votes
2 answers
660 views

Compile from parent directory in Emacs

I'm trying to map F5 to compile from a parent directory of the current buffer. Emacs compile-command find makefile in superior directory provides an excellent answer to achieve this: (defun compile-...
Yang's user avatar
  • 165
8 votes
1 answer
645 views

How to pass a prefix argument to helm-m-x?

I have read the prefix has to be added after running helm-m-x, but I don't know how to do it. For example I want to pass an argument to shell. When I run helm-m-x and then C-u I see in the mode-line [...
caisah's user avatar
  • 4,096
4 votes
2 answers
541 views

How to initiate a prompt for user input based on the prefix argument?

The below dummy foo describes how I need the prefix variable setting to work. I'd like the read-number prompt to show up only if the user entered C-u as prefix. In all other cases, the prefix will be ...
Kaushal Modi's user avatar
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4 votes
1 answer
187 views

Distinguish C-u <key> from C-u 4 <key>

I know that C-u sends the prefix 4. Is there any way to make C-u <key> a special case of a command, while still allowing C-u 4 <key>?
PythonNut's user avatar
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1 vote
2 answers
183 views

Getting latest command from function, but function exceeds "max-lisp-eval-depth"

This defines the Helm-source for Emacs commands history. (defvar helm-source-emacs-commands-history (helm-build-sync-source "Emacs commands history" :candidates (lambda () ...
ReneFroger's user avatar
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1 vote
2 answers
132 views

Obtain the raw prefix arg and its numeric value, and pass them to different commands

As I'm running out of easy key bindings I'm trying to overload C-SPC to either call set-mark-command or er/expand-region depending on if I have moved since I set the mark. However the two functions ...
stsquad's user avatar
  • 4,661
13 votes
3 answers
3k views

What is a raw prefix argument? (capital P in interactive)

And what can they be used for? (interactive "p") takes a numerical argument from the universal argument right? And the universal argument is just an int either way, so what does capital (interactive "...
24HrRevengeTherapist's user avatar
6 votes
3 answers
775 views

How to find out which function is bound to C-u C-SPC?

C-u C-SPC is used to Move point to where the mark was, and restore the mark from the ring of former marks. When trying to get the function bound to C-u C-SPC with describe-key it just stops ...
marcanuy's user avatar
  • 818
8 votes
3 answers
274 views

Swap default behavior of command with C-u behavior

Many Emacs commands alter their behavior when called with one or more C-u prefixes. In some cases the default behavior of a command is less useful to me than the behavior I get when prefixing it with ...
itsjeyd's user avatar
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7 votes
2 answers
2k views

How to insert inactive [timestamp] via function?

C-u C-c ! generates a time stamp like [2015-05-04 Mon 17:13] I would like to assign a shortcut (e.g F1) to this action. So far I have: (defun my/timenow (&optional arg) (interactive) (let (...
Leo Ufimtsev's user avatar
  • 4,558
1 vote
1 answer
293 views

how to assign a list or string to current-prefix-arg?

current-prefix-arg's help doc says, the variable can contain a list (or) number (or) minus symbol. I mostly set a number as the prefix-arg by keypress, C-[1-9]. But how can i assign a list or ...
Saravana's user avatar
  • 2,071
0 votes
1 answer
309 views

universal argument can not work in this function?

I made a function in Windows Emacs like: (defun explorer (&optional tex) (interactive) (let* ((current-path (file-name-directory (buffer-file-name))) (file-path-at-point (...
Leu_Grady's user avatar
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17 votes
2 answers
1k views

How to use a numeric prefix to repeat insertion of a digit?

Suppose I want to type '222222' in emacs, how do I use the numeric prefix idiom to achieve this? A naive guess would be 'C-u 6 2' but emacs interprets this as a numeric prefix of 62 and waits for the ...
dbjergaard's user avatar