Questions tagged [arguments]
"arguments" refer to those inputs to a function or program which are configurable by the caller, potentially differing on each call. Every argument is an input, but not every input is an argument -- for instance, a stream of data from a mouse could be an input and not an argument.
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How to write a function that handles its argument
I would like to implement a sensible strategy for handling optional arguments. In this instance, I want the function to be as for a function like abbrev-mode (although not in the context of a minor ...
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Passing numeric value to a function
I have got the following function but want to pass a numeric mode even if completing-read asks for a string.
(defun mycompany (mode)
"Enables or disables company text completion in buffer."...
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3
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Handling empty function optional argument
This function starts a new named shell buffer. How can I handle the case where bufrnm set by interactive in empty?
(defun galaxy-shell (&optional bufrnm)
"TODO"
(interactive "...
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1
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Handling optional arguments
This function makes a new named buffer that can run shell commands. But it only works properly when no argument is passed. When an argument is passed or set through the interactive clause, I would ...
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Checking optional function argument
If I have an optional function argument, how can I determine if name has been supplied. And if it has been supplied, how can I test its validity (not nil or not empty string).
(defun myfunc (&...
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Set an empty string for function argument with list
I have a function argument and want to set an empty string for name and mode. What can I do?
(defun bench (&optional name mode prefix)
"DOCSTRING"
(interactive
(cond
((...
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1
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Behaviour of Code Characters and Lists on Optional Arguments
Although the use of optional arguments to functions are easy to understand when running functions non-interactively. But things get complicated when declaring the function interactive, where you want ...
- 351
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Function arguments and interactive
I am having difficulty seeing how to properly use function arguments with the interactive command.
Suppose I have a function with three arguments myfunc (arg1 &optional arg2 arg3), the last two ...
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Changing of function arguments
I have a function workbench-named declared as follows, that calls another one called workbench. Have changed workbench to include a prefix argument. Thusly workbench-named is not calling workbench ...
- 351
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1
answer
29
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How to pass a variable to a click handler?
I'm using this code to make clickable text in a buffer:
(defun q()
"Entry point."
(interactive)
(let ((buffer-name "q"))
(get-buffer-create buffer-name)
(switch-to-...
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1
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Interactive option for function with optional arguments
Am unsure whether making brcmk-end optional is possible for interactive use. If one can have optional arguments, what would be the changed necessary? Would the interactive expression change?
(...
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1
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22
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Wrong type argument in conditional
I have the following code that counts the number of opening and closing braces, but getting the error
and: Wrong type argument: stringp, 40
Here is the code:
(defcustom rk-bracemk '("()"...
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2
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Using defadvice to add an interactive argument to a non-interactive function?
Is there a way to wrap a non-interactive function within defadvice so that the new function can accept an interactive argument which can alter the way that the wrapped function gets called?
In other ...
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1
answer
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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 ...
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Cygwin ctrl-number not working (in cli emacs)
Originally posted to superuser.
Cygwin ctrl-number is not working in cli emacs. I disabled the mintty options for keyboard shortcuts, so now ^- does work the same as ^u -1. Still, ctrl-number ...
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Validating Arguments to a Function
I would like to validate the argument to a function before its action is executed. The main concern is the passing of a void variable. How can I trap this?
(defun is-it-bound(item)
(if (boundp 'item)...
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Passing variable to a function consisting of multiple components
Consider the following example:
(defun glue (str1 str2)
(format "%s%s" str1 str2))
(setq str1 "Hello, ")
(setq str2 "World!")
(insert (glue str1 str2))
This inserts ...
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1
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New `wrong-number-of-arguments` error from `desktop-change-dir` and other commands
(This has started happening with other commands too, but I don't remember which.)
Previously when I ran M-x desktop-change-dir I would be prompted to enter a folder, whereupon Emacs would load the ....
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1
answer
47
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How to use header-args variables to fill cell values of a table
I have an org-mode file as such:
* Header level 1
:header-args: :var filename="somefile.csv"
** Header level 2
:header-args: :var foo="bar"
#+begin_src emacs-lisp
foo
#+end_src
#+...
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1
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3
answers
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how to find number of arguments expected by an elisp function in emacs
I have some code that I use in my .emacs file that works with version 25.5 where the definition of windows--sanitize-window-sizes looks something like this:
(defun window--sanitize-window-sizes (frame ...
- 299
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0
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Defining a function that takes keyword arguments and a variable number of positional ones
I want to define a function that takes both keyword arguments (as in &key) and a variable number of positional ones (&rest). They should be independent of each other, the keyword list should ...
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2
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75
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How to raise an error when unrecogized keyword arguments are passed to a function?
With a function that uses keyword arguments using this style of function definition:
(defun some-name (&rest kwargs)
(plist-get kwargs 'example))
Is there a convenient way to ensure only ...
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3
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Default argument when nil is provided
I'm writing a function which wraps org-export-as for use in html conversion of a file. In this function, I define the options for org-export-with-toc, org-export-with-section-numbers, and org-html-...
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2
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1
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How to introspect function & macro arguments in elisp?
Is there a programmatic way to access function/macro arguments,
Something like this, which returns the the arg count and true if it accepts any number of additional arguments.
eg:
(number-of-...
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1
vote
1
answer
80
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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-...
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1
vote
2
answers
123
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Problem with giving inputs to a function programmatically
Some programs take user inputs, for example by calling the interactive function `sunrise-sunset', two arguments are taken from the user. Assume that the inputs are 0.0098 and 51.4934 (these are ...
- 7,364
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1
answer
450
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How to check whether an optional param was input?
I have a command with an optional argument whose value is a number.
I need:
If no input argument then use default value (1000) else use input arg.
(random t)
(defun insert-random-number-at-point(&...
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2
answers
89
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What is a good strategy to locating function arguments in a buffer?
I'd like to create a few routines for manipulating function arguments in buffers, which of course requires me to first locate the arguments. Suppose that I'm operating on a buffer with a programming ...
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advice-add FOR function dired-do-copy
I got a problem for an advice-add inside Dired's copy function (dired-do-copy).
My object is it to filter all marked files/directories in Dired, which should be copied to an other location within ...
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2
answers
102
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Arbitrary length lists as argument for interactive function
Say I have a defun with a dolist inside that I want to be able to pass a string that is then converted to a list with a length equal to the number of words in said string via the minibuffer, so ...
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1
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1
answer
229
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Show constructor arguments for c++
Is there a package that can tell me the arguments for c++ constructor?
class T1 {
public:
T1(int x, int y);
};
T1::T1(int x, int y) {
std::cout << x+y << std::endl;
}
...
- 13
2
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1
answer
246
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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-...
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1
answer
120
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Was Emacs launched with a filename argument?
Suppose I want Emacs to be configured differently depending on whether or not it was launched with a filename as an argument.
Is there a way I can deduce this as part of my init file?
One way is to ...
- 272
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3
answers
458
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Reflection on function argument signatures
Is there anything built into elisp for reflection on function argument signatures?
I have used (length (cadr (symbol-function #'my/function))), but this notably fails on built-in C functions.
I'm ...
- 6,894
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2
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Calling a function with a shorter but unknown argument signature length
Is there a terse idiomatic way of calling a function in the manner of funcall (dereferencing function symbols) when that function may have a variably shorter function signature?
Say for example: a ...
- 6,894
2
votes
2
answers
184
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Can I pass an arbitrary symbol/keyword as a non-nil argument?
If a function takes a parameter whose only significance is in whether it's nil or non-nil, is there any reason not to pass it a well-named symbol to clarify what's going on in the calling code?
For ...
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2
answers
138
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Is there a way to only accept certain arguments to a function?
I want to write a function where the only two valid values for the input argument are "dag" or "rulegraph". Is there a way to specify that only these two arguments are accepted this in the elisp ...
- 2,253
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1
answer
239
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How does (org-agenda-todo arg) work? What does the argument mean?
By trial and error I have found that in org-agenda (org-agenda-todo 'done) marks the entry at point as "DONE".
Can you explain why?
How can I modify the argument to the org-agenda-todo function (or ...
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1
answer
94
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How can I use a var to provide multiple arguments to a function? [duplicate]
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-...
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2
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How to pass an argument from command to another command?
From the package Neotree, I want to bind a key, that moves to the upper directory.
The upper directory is always on the top with .. (up a dir). So I go to the first line of the neotree buffer, and ...
- 3,735
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2
answers
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Error: Wrong type argument: symbolp, (t)
I'm new to emacs and try to learn elisp. I've read some tutorials and try to build now my own customized emacs. Looking at this blog I want to write a similar script for automatically installing ...
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2
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950
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How to manipulate argument list in nadvice.el?
Following on from an answer to another question about the new advice system:
In old-style advice.el, it was possible to manipulate individual members of an advised function's argument list, without ...
- 552
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3
answers
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How to write a transparent "pass-through" function wrapper?
What I mean by a "transparent 'pass-through' function wrapper" is a function, let's call it wrapper, that returns the result from passing all its argument to some other function, let's call it wrappee....
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1
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709
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How to programmatically answer "yes" to those commands that prompt for a decision from the user?
I made a custom function that combines two functions of twittering-mode , twittering-favorite and twittering-native-retweet, however these two needs input from me by answering an yes or no question.
...
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1
answer
97
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How to figure out which parameters a function actually need?
I would like to insert the number 1, and then increase the number with calling
the function evil-numbers/inc-at-pt from the package evil-numbers.
So I went looking into the source code of the ...
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1
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365
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turn a list into a set of arguments for a function [duplicate]
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, ...
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