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39 votes
2 answers
6k views

How to evaluate the variables before adding them to a list?

The below obviously doesn't work and hence this question. How do I correct the below code so that the value of somelist becomes '(("abc" . 123)) ? (setq x "abc") (setq y 123) (setq somelist nil) (...
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  • 24.3k
39 votes
6 answers
15k views

Problems with keybindings when using terminal

I have the following line in init.el: (global-set-key [(control \;)] 'comment-region) It works very well in GUI window, but if emacs is invoked with the -nw option then C-; doesn't comment region, ...
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24 votes
1 answer
3k views

How do I troubleshoot Emacs problems?

In a situation where Emacs is not behaving like I want, what can I do to troubleshoot the problem? What steps can I take to find and fix the problem myself? Or, failing that, how can I gather useful ...
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  • 20.5k
42 votes
1 answer
4k views

What is the difference between a function and a command?

When posting questions and answers here, people sometimes use the terms "function" and "command" interchangeably. In other cases, people only use one of the two terms to discuss specific pieces of ...
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  • 14.3k
63 votes
12 answers
8k views

Synchronize packages between different machines

I use emacs in different places and I want to have a similar setup and packages installed everywhere. I guess I can use a version control repository for the setup files. Since I use Prelude, that ...
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  • 1,581
50 votes
5 answers
13k views

How to override major mode bindings

Sometimes my global keybindings are overridden by a major mode. An easy example is the following setting in my init file (global-set-key (kbd "C-j") 'newline-and-indent) But annoyingly this ...
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  • 7,843
31 votes
1 answer
6k views

Why do regular expressions created with the regex builder use syntax different from the interactive regular expressions?

So, using the regular expression builder (M-x re-builder), finding lines that end in \ takes "\\$", while in search and replace by regex, it only takes "\$". I would have expected the regex builder ...
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  • 2,091
38 votes
2 answers
9k views

What's the difference between a buffer, a file, a window, and a frame?

When posing questions on this site, people sometimes talk about "windows" when they mean "frames," and "buffers" or "files" when they mean "windows." So: Q: What is the difference between a buffer, ...
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  • 31.2k
70 votes
4 answers
16k views

How can I find out in which keymap a key is bound?

I have rebound a the 'd' key in gnus-article-mode, but its old behavior is still active when the point is on an attachment. I can see that the rebinding did not take effect there by doing C-h k d, but ...
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  • 895
10 votes
1 answer
1k views

How to get the raw data for an org-mode agenda without an agenda view?

Q: How can I have org-mode return the raw data for an agenda view without actually creating an agenda view? I'd like to access my agenda for an arbitrary day. However, I do not want to create an ...
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  • 31.2k
19 votes
2 answers
3k views

How to bind C-i as different from TAB?

I want to make Control-i perform indent-region (basically since Xcode has built that muscle memory already). I realise that Control-i and tab are indistinguishable in the Ascii sense, but they are in ...
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6 votes
2 answers
3k views

How to modify-face for a specific buffer?

I work with a lot of tabular data files and use stripe-buffer.el make them easier to read. But I also work with more than one, so I'd like to make it easier to distinguish among them as well and want ...
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  • 3,477
5 votes
2 answers
2k views

Defining key-bindings within `helm-map`: getting a `void-variable helm-map` error

Am going through this Helm tutorial at the moment; I pasted in the code verbatim (for now, I'll adapt it to suit my preferences later). I did a quick google search for this particular error but it ...
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  • 1,078
35 votes
5 answers
5k views

Is there a way to use query-replace from grep/ack/ag output modes?

I'm aware of find-grep-dired, marking the corresponding files and then pressing Q to run dired-do-query-replace-regexp on the marked files. Unfortunately that requires restarting the grep and no ...
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  • 4,004
25 votes
5 answers
14k views

Browser-style 'tabs' for emacs?

I would like tabs like firefox but for emacs. I found this: http://emacswiki.org/emacs/TabBarMode But it just add to each buffer (window in Emacs terminology) a bar that shows currently open buffers....
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  • 4,408
18 votes
3 answers
8k views

Why do I have to add each package to load-path? (or Problem with require 'package in my init file)

Each time I install a package from the Package Menu, if I try to require it in my init file I get an error unless I manually add it to the load-path: (add-to-list 'load-path "/home/nick/.emacs.d/elpa/...
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  • 4,253
13 votes
1 answer
574 views

Why does a constant in `let` change with repeated calls? [duplicate]

Say we have such a foo function: (defun foo (e) (let ((lst '(a b c))) (delq e lst))) Then we use it in following way (sequentially evaluating one by one): (foo 'c) ; => (a b) (foo 'b) ; =&...
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30 votes
2 answers
6k views

Is it possible to export content of subtrees without their headings?

I draft documents in org-mode and export them to LaTeX, HTML, etc. as needed. I frequently use the tag :no_export: whenever I don't want a certain subtree to show up in the output. What I also want ...
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  • 2,763
22 votes
3 answers
4k views

A faster method to obtain `line-number-at-pos` in large buffers

The function line-number-at-pos (when repeated about 50 times) is causing a noticeable slow-down in semi-large buffers -- e.g., 50,000 lines -- when point is near the end of the buffer. By slow-down, ...
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  • 17.8k
16 votes
1 answer
2k views

Why can't I bind my function to a key or call it with M-x?

I wrote a function, and I want to call it via M-x, and bind it to a key. This is my function: (defun my-function () (message "This is a great function")) If I try to call it with M-x my-function,...
6 votes
2 answers
1k views

How to define a function that calls a console process using ansi-term?

I'm using Julia within emacs, and I've found that despite the existence of ess and julia-mode, the best way for me to do that seems to be to use ansi-term and execute: ipython3 console --kernel=julia-...
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  • 778
59 votes
4 answers
8k views

Debugging a frozen Emacs

I am using mew for my e-mail. I need to use TLS with my email provider for SMTP. However, when I try to invoke that, Emacs freezes. I would like to take this opportunity to learn more about Emacs ...
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  • 691
15 votes
3 answers
6k views

Shift+Up isn't recognized by Emacs in a terminal

Very often I use Shift+Up/Down to select a region in Emacs. It works fine in GUI mode, but when emacs is invoked with -nw option I can select lines only with Shift+Down. The Shift+Up doesn't work, I ...
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19 votes
3 answers
937 views

How to collapse undo history?

I'm working on an Emacs mode that lets you control Emacs with speech recognition. One of the problems I've ran into is that the way Emacs handles undo doesn't match how you would expect it to work ...
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12 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 ...
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  • 2,919
4 votes
1 answer
691 views

How to create a new buffer with ivy-switch-buffer that shares a substring with an existing buffer?

Suppose I have a file opened called "analysis-evaluation.tex" and I'd like to create a new buffer called "eval". When using Ido, I would press C-j to create a new buffer rather than switching to an ...
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  • 261
83 votes
4 answers
17k views

Advantages of setting variables with setq instead of custom.el?

I see a lot of people (extension authors and others) give configuration examples with setq: (setq foo 'bar) These parameters are often defined with defcustom, making them available for customization ...
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54 votes
3 answers
13k views

Inline verbatim and code with quotes in Org-mode

In Org-mode I can surround text with = or ~ to place text in inline verbatim or code mode. However this fails if the text has quotes, and I couldn't find an explanation or workaround in the ...
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101 votes
11 answers
16k views

How do I prevent extremely long lines making Emacs slow?

I see hugely varied performance depending on how many newlines there are in the file I'm visiting. Here's an example. I have two JSON files: $ wget https://github.com/Wilfred/ReVo-utilities/blob/...
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29 votes
1 answer
14k views

How to highlight text permanently in org-mode

I know I can use *bold*, /italic/, _underlined_, =verbatim= and ~code~, and, if you must, ‘+strike-through+’ to do some markup to text according to org-mode documentation, but they are not enough for ...
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  • 2,559
18 votes
1 answer
3k views

How do I debug an emacs crash?

I am debugging why emacs crashes when using a function from a package1. The aim of this debug process is to get useful data to submit using M-x report-emacs-bug. To get help on how to debug emacs ...
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  • 24.3k
11 votes
1 answer
7k views

how do I quickly remove lines from emacs buffer

In an emacs buffer when editing a file called "log/development.log" how do I quickly remove all lines containing the word "Render"
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9 votes
1 answer
1k views

When to use quote for lists? Modifying quoted lists in Elisp

The Common Lisp Hyper Spec says: The consequences are undefined if literal objects (including quoted objects) are destructively modified. This is further motivated at the Constant Modification ...
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  • 30.5k
10 votes
2 answers
4k views

How to set emacs frame size by pixels

I can resize the emacs frame to whatever size by mouse, is there a way that the frame size be set in init.el by pixels? Or anything similar in the window manager?
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  • 1,165
9 votes
3 answers
1k views

how to get Emacs to locate the error in my init file without relaunching?

When there's an error in one of my init files, I get a vague message like this when I launch Emacs: Warning (initialization): An error occurred while loading /Users/im/.emacs.d/init.elc: (wrong-type-...
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106 votes
3 answers
37k views

How to Restore File System Access in macOS Catalina

I updated to macOS Catalina which requires the user through pop-ups to allow any app trying to access the file system for the first time. No such pop-up is appearing for Emacs. Running the script ...
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  • 1,163
30 votes
1 answer
33k views

How to use pdf-tools (pdf-view-mode) in emacs?

pdf-tools includes pdf-view-mode which offers several features not present in doc-view-mode (see end of question). Can pdf-view-mode be used as a replacement for doc-view-mode generally, or does it ...
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54 votes
4 answers
4k views

Practical benefits of new advice system in Emacs 24.4

Emacs 24.4 comes with a new advice system. The NEWS file says: ** New package nadvice.el offers lighter-weight advice facilities. It is layered as: *** add-function/remove-function, which ...
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  • 14.3k
33 votes
4 answers
4k views

When to sharp-quote a lambda expression?

Q: When, if ever, is it useful to sharp-quote a lambda, and when, if ever, must we not sharp-quote a lambda? People use lambdas in three ways: plain: (lambda (x) x) quoted: '(lambda (x) x) sharp-...
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  • 31.2k
17 votes
2 answers
2k views

When should sharp quotes be used?

I see sharp quotes being used in other people's eLisp code, and I use them myself, but I'm not completely clear on when they are appropriate and when not. Could anyone clarify on exactly when it's ...
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  • 1,588
7 votes
1 answer
738 views

Multiple major modes in one buffer (e.g., python-mode & LaTeX-mode)

Using the LaTeX-package pythontex I one can insert python code into the latex document which is executed (and printed to your latex file if you want) if you run latex. I use auctex for editing latex ...
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  • 977
10 votes
2 answers
4k views

How to build Emacs master branch (aka trunk) on MS-Windows

I took the plunge today and started out on my quest to build the most recent Emacs master branch developer build -- aka Emacs Trunk -- for MS-Windows. I found an old blog and went through the ...
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  • 17.8k
14 votes
3 answers
6k views

How i can open shell in current buffer?

In function "shell" this line display shell buffer and almost always its open new shell in random frame. And I have to swap the buffers, it's annoying. ... (pop-to-buffer buffer) ... In docs says: ...
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9 votes
3 answers
4k views

Emacs bind key to prefix

suppose I want to bind a key to a partial key sequence (i.e. a key sequence that is a prefix of some other bound keybindings). I've tried the obvious (global-set-key (kbd "C-x C-x") (kbd "C-c")) ...
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  • 10.1k
2 votes
2 answers
884 views

Table formula for dates delta

Here my org table: | | Start date | End date | State | Duration | |---+------------------------+------------------------+-------+----------| | # | <2019-01-02 Wed 10:...
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  • 3,445
56 votes
9 answers
32k views

Using Emacs as a full-featured C/C++ IDE

I have been trying off and on for over a year now to use Emacs as a C/C++ IDE. I have only been marginally successful thus far, but have run into a few brick walls along the way. Currently I am ...
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  • 7,843
51 votes
3 answers
5k views

How to save a keyboard macro as a Lisp function?

Very frequently I would need to perform the set of steps requiring multiple key strokes. For the same session those steps can be recorded in a keyboard macro. An example is saving a frequently ...
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  • 24.3k
46 votes
7 answers
12k views

How to treat underscore as part of the word?

I use Emacs + evil mode. When I position the cursor on e (in normal state) in a chunk of text such as abc_def_ghi, ciw (change inner word) changes only the def part of the string, while Vim would ...
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  • 1,087
27 votes
6 answers
8k views

How can I get an org-mode outline in a 2nd buffer as a dynamic table of contents?

When I edit large documents, I would like to see where I'm at by seeing the outline (with no-content) in a separate buffer. Like when you read a PDF file there is a TOC on the left. (see below) In ...
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  • 4,408
28 votes
3 answers
4k views

Extending org-mode with more markups

I want to add a markup and formatting for such markup, i.e. <kbd>...</kbd> with a box surrounds such markup. I also want the mark up to be compatible with (setq org-hide-emphasis-markers t)...
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  • 6,682

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