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Questions tagged [error-handling]

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23 views

Can a mode setup function fail?

If I define a new mode using define-derived-mode or define-minor-mode, can the mode setup somehow signal failure so that the mode is not activated? All of the following modes are activated despite ...
0
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1answer
15 views

How to handle multiple kinds of errors with condition-case?

With condition-case, is there a way to handle multiple kinds of errors? Currently I have user-error and error both being handled. Is there a way to de-duplicate these checks to handle any kind of ...
0
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1answer
19 views

Why does Emacs not enter the debugger when popping a cons twice?

I wrote some LISP code that was wrong because I was trying to pop a cons twice: (let ((pair '("a" . "b"))) (let* ((a (pop pair)) (b (pop pair))) b)) Evaluating this in the *scratch* ...
4
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2answers
99 views

How to report that an interactive command couldn't run?

When writing my own interactive function, whats the best way to report that nothing happened. (if line-is-empty (message "Found empty line, nothing to do!") (do-stuff)) Or is it better to use ...
0
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0answers
186 views

Fontconfig Error in Snap version of Emacs

I installed Emacs 26.3 using Snap in my Debian Buster. After I launch it, it gives me the following errors: Fontconfig warning: "/etc/fonts/fonts.conf", line 5: unknown element "its:rules" Fontconfig ...
1
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1answer
36 views

How does emacs flash its icon on the windows taskbar?

Sometimes when I run a process if there is an error during the process the emacs icon on the windows taskbar lights up, so if I'm in an other app I can see something happened there. I'd like to use ...
0
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0answers
17 views

AucTeX'sTeX-next-error not catching any errors in ConTeXt

AucTeX's TeX-next-error doesn't display any of the errors listed in the output buffer, only "No more errors". MWE: \starttext \Hello \stoptext % Local Variables: % ConTeXt-Mark-version: "IV" % End: ...
0
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0answers
15 views

“<Hangul> is undefined” error on space key press

I'm running Emacs 26.1 without any "strange" configuration: a bare bone Ubuntu 19.04 emacs package with few packages installed from elpa or melpa. I have the following issue: when pressing space bar ...
2
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2answers
66 views

Couldn't make condition-case work

Hello fellow Emacs Lisp enthusiasts! I've encountered problem that I am even embarrassed to describe. It is very clear how to use condition-case from all the docs and examples that I can find online, ...
1
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1answer
47 views

After setting bookmark: `Wrong type argument: listp, "~/.spacemacs`

So I did just M-x bookmark-save in my original .spacemacs file, which lead to the case that when I booted Spacemacs, I get the following error: Upgrading bookmark format from 0 to 1... mapcar: Wrong ...
0
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0answers
50 views

Why AUCTeX/pdflatex show me help in Japanese?

I had this error message displayed to me by AUCTeX (already corrected using \ddot{\boldsymbol x}) ERROR: Extra }, or forgotten $. --- TeX said --- <recently read> } l.51 \[ \boldsymbol M\ddot\...
1
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1answer
52 views

Latex compilation message in the echo area dissapears too soon

The outcome (success/error) of a Latex compilation (TeX-command-run-all) is printed in the echo area. Once you press a key, however, the echo area is cleared and the message is gone. I usually look at ...
1
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1answer
67 views

Keep going mode for require-package

In my initialization file, I have got: (require-package 'clips-mode) The thing is that, lately, this package fails to be loaded sometimes (it's already downloaded but I guess it fails when it tries ...
0
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1answer
57 views

helm-mu on macOS throws Invalid read syntax: (")

Hej guys, I get an error when searching through my mails with helm-mu. Messages gives Invalid face reference: helm-grep-finish [96 times] error in process filter: helm-mu-candidate-parser: End of ...
3
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2answers
764 views

Orgmode table error - shrunk field?

I'm very new to Emacs and Org mode, so I'm basically fumbling around. I'm getting an alarm bell ding whenever I type in an table in an *.org file. A message says "invalid function: org-table-with-...
0
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1answer
39 views

Identify which mode is throwing an error

I am attempting to edit a file. Emacs is preventing me from making the edit, and throwing: Args out of range: #<buffer user.action.js>, 4965, 17721. It is completely not obvious to me where this ...
0
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0answers
131 views

“No such file or directory, bind-key” after installing use-package [duplicate]

I'm using Emacs on Windows 10. I want to override key bindings, so after reading How to override major mode bindings, I installed use-package with the built-in package manager (via M-x package-install ...
0
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1answer
32 views

How Can I Prevent make-process from failing if the default-directory doesn't exist?

Usually, when you open a file, Emacs prompts you to run M-x make-directory RET RET if the directory doesn't exist. However, after writing my own advice, I realized that opening files in directories ...
1
vote
1answer
101 views

How can I disable the “<C-lwindow> is undefined” error?

I use Windows 10's virtual desktop feature. The hotkey for switching between virtual desktops is Ctrl-Win-Left / Ctrl-Win-Right. When Emacs is focused and I want to switch dekstops, I get an error ...
1
vote
1answer
204 views

Running emacs client: how do you know if the init files had errors loading

I use emacs 25, in nw mode, with "alias emacs='emacsclient -nw'" When I add something to my personal.el, I do brew services restart emacs My issue is, if I make a big blunder inside my personal.el ...
0
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0answers
272 views

toggle-debug-on-error only works for the first error, how can i fix this?

when I enable debug on error it works perfectly the first time. when I go and fix my error and rerun my function debug on error no longer triggers for new errors. Is there a way to enable it so ...
2
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1answer
36 views

Exiting from outer calling functions on error

Consider the following: (defun my-divide-by-0() (condition-case nil (/ 1 0) (error (progn (message "Could not evaluate: 1/0") nil)))) (defun my-test() (interactive) (my-divide-by-0) ...
0
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1answer
113 views

redirect stderr to a file in call-process-region

I have been reading the documentation for call-process-region here and I am trying to redirect stderr to a file. from the the documentation, this looks correct (call-process-region beg end perltidy-...
1
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2answers
146 views

Is the unwind-protect's clean form always evaluated?

I have this loop: (catch 'QUIT (while (search-forward-regexp "\\([^\n\\]\\(?:\\\\\\\\\\)*\\|^\\(?:\\\\\\\\\\)+\\)%.*\n" nil t) (save-excursion (let ((b (make-...
3
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1answer
54 views

When I (byte-compile-file “my-package.el”), can I treat warnings as errors?

As part of CI testing, I'm byte-compiling package files to make sure there are no errors. I'd like to take this a step further and ensure there are no warnings, either (like 'function not known to be ...
0
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0answers
100 views

On Windows 8.1, in Emacs Ghostscript doesn't work, while on commandline it does

Edited question of August 2017: After a long search I found the reason, why a wonderful software called pdfsizeopt (for my question from April 2017 see below) does not work, when called from Emacs, ...
2
votes
2answers
1k views

Symbol's function definition is void: insert-string

;; Specify the startup banner. Default value is `official', it displays ;; the official spacemacs logo. An integer value is the index of text ;; banner, `random' chooses a random text banner in `core/...
2
votes
1answer
340 views

What is the difference between the error handler in condition-case and the error function

I am wondering the semantic of the error function. For condition-case, the Elisp manual says: The arguments after the protected form are handlers. Each handler lists one or more condition names (...
12
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1answer
570 views

Get backtrace from error programmatically

If an error is signalled in Emacs Lisp code, and debug-on-error is t, I get a backtrace buffer that makes it easy to figure out where the error occurred. However, for errors that occur while ...
2
votes
1answer
83 views

Taking action depending on the presence of particular message in the echo area

I have my proper function to run latex, say my-tex. Sometimes one should run latex two times to get references right. A message like below in the echo area appears to tell this. How to identify ...
2
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1answer
51 views

Standard way of reporting user errors to user?

I am writing an emacs package which provides some commands to the user. The user can run things like M-x foobar and M-x eggsspam. However, some of these commands can fail. As an example, without ...
2
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1answer
37 views

Which function should I advise to do something when a user-error is unhandled?

I need to advise emacs to do something when any error dings to the user. I can't find any documentation on which function I actually need to advise. Which function do I need to advise to do ...
2
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1answer
32 views

Catch invalid calc expression

Inspired by this blog I wrote a function which replaces arithmetic expressions between two $ symbols with the mathematical result inline (and deletes the $ symbols). How can I modify this such that it ...
48
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2answers
8k views

What do I do when Emacs is frozen? [duplicate]

What should I do when Emacs stops responding? My current "emacs-is-frozen" protocol looks like this: Spam C-g (it sometimes works) Wait for a while. pkill -9 emacs What alternate steps could I try ...
2
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1answer
161 views

Break on all errors in edebug

How can I make Emacs break on an error, even if the error is being handled somewhere? In my current scenario, the setup of a major mode is modifying the buffer and I want to find out why (and then ...
0
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2answers
205 views

autoload list of packages in Emacs 25.0.92

According to emacs.SE answer I am trying to make Emacs (version 25.0.92) autoload packages if they are not already installed on my computer. At my .emacs file now I have only: (package-initialize) (...
6
votes
1answer
179 views

How to abort saving in a before-save-hook function?

If, in a function run from before-save-hook, I want to abort the saving of a file, so that the file is not saved and the user is signaled, how can I do that? Is it possible (without rebinding C-xC-s ...
0
votes
1answer
616 views

Cryptic startup error messages

I just started out on emacs so this might have a really simple answer. I'm getting an error message on startup and have no idea what it means. The debug message doesn't help much either. What do ...
3
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3answers
519 views

Finding frames by name

I'm trying to write a little compilation monitor frame that gets compilation updates written to it without the overhead of seeing absolutely everything going on in the compile. I've been working with ...
4
votes
1answer
306 views

How to condition-case Lisp nesting exceeds `max-lisp-eval-depth'?

I'd like to catch too big recursive call nesting in elisp, like this: (condition-case nil (potentially-too-recursive-function) (xxx (message "Gave up, using defaults"))) What is the symbol in ...
1
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0answers
820 views

Can't exit Emacs with error “End of file during parsing”

Every time I press c-x c-c to exit Emacs, it shows "End of file during parsing" in the minibuffer. I cursorily examined my .emacs and did not find any mismatching parenthesis. Any idea what's the ...
9
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2answers
301 views

Rethrowing an error in Emacs Lisp

I need to call a function and perform a cleanup only if the function fails, and then relaunch the error. Here is the pseudo-code: (condition-case err (call-function) (error (cleanup) ;; ...
3
votes
3answers
195 views

How to call another function, if one function gives an error message

Suppose I call a function which is named as foo. Sometimes that function foo will give a message such as "Example of error message". If that is the case, then something else should be executed. ...
2
votes
1answer
52 views

Invoke function on message

The debug-on-message variable tells Emacs to start the debugger when a matching message is displayed. How can I get Emacs to invoke my own function when a matching message is displayed? My motivation ...
5
votes
1answer
575 views

Capturing stderr of subprocesses

I'm trying to capture stderr separately from stdout for a (synchronous) process run from emacs. I've found one way of doing it based on some code copied from emacs' shell-command function (I don't ...
3
votes
1answer
75 views

Perform function until it returns user-error

I want to define a function org-move-subtree-top that calls org-move-subtree-up until it returns a user-error (in this case "Cannot move past superior level or buffer limit"). How can I do this in ...
15
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3answers
4k views

Show line number on error

Say that emacs throws some error that I don't understand. Or maybe the error says "Symbol's value as variable is void: modes", but there are many occurrences of the symbol modes in my code, so I need ...
3
votes
1answer
162 views

How do I catch signals?

After reading the documentation, here's what I've tried: (condition-case err (signal 'my-error 'my-data) (my-error (message "data: %S" err))) Evaluating this form still throws the signal, ...
4
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1answer
333 views

define-error for older Emacs?

I'm using define-error to throw custom errors. But it looks like this function wasn't yet implemented in emacs-24.3, for instance. It still seems to work for emacs-24.3 if I write this: (when (...
4
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3answers
1k views

File mode specification error: How to find syntax problem: Missing :END: line in org-mode properties?

When I launch my emacs software (Aquamacs.app) I see a message File mode specification error: (error ":END: line missing at position 23740") Unfortunately, I do not know in which file this problem ...

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