Questions tagged [major-mode]

The mode that determines the editing behavior of Emacs while that buffer is current. The mode line normally shows the name of the current major mode, in parentheses.

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How to bind a key in a `generic` mode?

Is there a way to bind a key in a mode defined using define-generic-mode such as xmodmap-generic-mode? Generic does not appear to create keymaps. ELISP> (require 'generic-x) generic-x ELISP> (...
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Keybindigs conflict between minor modes

The configuration that I have for python mode implies loading both elpy.el and python.el. The things is that I found the python.el keybindings more natural than the elpy.el ones. And most of the ...
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SMIE Indenting Arguments and Blocks

This is closely related to a previous question I asked here: SMIE Basic Identation and Block Example However, it is sufficiently different (and already big enough) that I might as well ask it as a ...
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SMIE Basic Identation and Block Example

I've tried for a while to create a simple major mode that uses SMIE to perform navigation and indentation, but it seems like even the simple examples that I've found seems to break quite easily. The ...
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1answer
320 views

Is a Lisp program in both prog-mode and lisp-mode?

Upon reading (emacs) Program Modes: Entering a programming language mode runs the custom Lisp functions specified in the hook variable prog-mode-hook, followed by those specified in the mode's ...
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1answer
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Retrieve all the major modes equipped with emacs

I learned that GNU Emacs Manual Most major modes fall into three major groups. The first group contains modes for normal text, either plain or with mark-up. It includes Text mode, HTML mode, ...
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1answer
47 views

Why won't `emacs -nw -f org-mode foo` open `foo` in `org-mode`?

I want to open a file foo in org-mode on the terminal. However, Issuing emacs -nw -f org-mode foo opens foo in Fundamental mode. What's wrong with my command?
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1answer
62 views

Setting the major mode of a new buffer interactively

When creating a new buffer via: C-x b NonExistentBufferName RET RET I would like Emacs to prompt me for the major mode this buffer is going to use upon opening. Moreover, I want Emacs to infer the ...
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1answer
37 views

Set the major mode of a new buffer interactively

When creating a new buffer via: C-x b NonExistentBufferName RET RET I would like Emacs to ask me what major mode this buffer is going to use upon opening. Moreover, I want Emacs to infer the major ...
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2answers
129 views

How do I disassociate a filetype and mode?

I think the Change Log mode in emacs (spacemacs) acts crazily and I want to turn it off when editing my CHANGELOG. How do I do that for good?
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Running logo program (ucblogo) in Emacs

I am trying to run logo programs (ucblogo version 5.5) on my emacs in Debian Linux (26.1). There is a currently a mode for it ( https://www.emacswiki.org/emacs/LogoMode ). I followed the instructions ...
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Spacemacs - python mode

I have some problems with my spacemacs configuration. For instance, it's supposed to be globally set up with emacs editing mode and the line numbers as well dotspacemacs-editing-style 'emacs ...
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How to start emacs in “nothing” mode (`fundamental-mode`)

If I type emacs test.sh Emacs insists on putting me in Shell-script mode. Another time I want to edit the file help.txt and then Emacs puts me in Text mode. But sometimes I don't want any of this, ...
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1answer
65 views

does one has to explicity enable python-mode etc. to work with python files?

Sometimes I see people talking about enabling python-mode and so on. Is that only necessary for older emacs versions? I thought, the respective mode is enabled automatically when opening a ...
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1answer
89 views

How to check if a major mode derives from another?

Is it possible to check if a mode is derived from another mode? eg: (member major-mode '(c-mode c++-mode glsl-mode)) Could be replace with something like this: (does-mode-derive-from major-mode cc-...
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2answers
139 views

Are there hooks for leaving modes?

There seems to be a bug in clojure-mode (mentioned here) because it does things in a mode hook (for paredit-mode) but doesn't undo them when the mode is turned off. I understand that add-hook can ...
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1answer
67 views

Emacs custom major mode with multiple comment types

I'm trying to write my first (very simple) major mode for Emacs. My goal is to have multiple comment types, but I can't find a way to implement this. Basically, I want my major mode to make ...
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208 views

Spacemacs user-config error

I'm using Spacemacs to develop a laravel + Vue application and I followed the steps in this configuration example to highlight syntax in Vue, but now every time Spacemacs starts it gives me this error:...
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Get the syntax coloring of another mode for newly defined mode

I am defining a new mode in emacs, but I want to have the same syntax highlighting as Org mode. How can I do this?
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0answers
68 views

Strange comment indentation results

I am working with a simple major mode. The format has one single line comment delimiter, i.e., %. However, I get strange results when running fill-paragraph on a comment. Specifically, the result I ...
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2answers
146 views

what are the options to write a language grammar for a new major mode?

I am writing a major mode for a programming language that has a well-defined grammar: it has a BNF, formalised in some happy files. I don't particularly want to re-implement the BNF as a series of ...
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1answer
74 views

Create a command or key binding for closing code blocks

In AUXtex there is the key binding macro C-c ] which closes the lowest current TeX environment. For example \begin{equation} ... would be closed (by putting an \end{equation} on a new line after ...
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Change major-mode keymap char-table

I'm trying to write my own major mode, which I want to use under MS Windows. Unfortunately, Windows doesn't have my favourite keyboard layout, so I'm planning to implement this keyboard layout in my ...
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2answers
106 views

How to make all variables and functions of a mode visible without activating the mode

Let's say I want to customize a keybind for a mode that hasn't been loaded yet like so: (define-key eshell-mode-map (kbd "C-M-i") 'eshell-previous-input) But the problem is if I haven't yet loaded ...
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1answer
184 views

What does the `/l` mean in the mode `C++/l` mean?

Just a simple question with more than likely a simple answer: What does the /l mean in the mode C++/l mean?
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# -*- mode: … -*- string fallback

So I know that I can put at the first or second line of a file a line such as: # -*- mode: conf -*- to tell Emacs what major mode I want the file to be opened with. But if that mode isn't installed ...
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2answers
60 views

When writing a new major mode, should it add itself to auto-mode-alist?

I am defining a new major mode, foo-mode, which is closely and only associated with .foo files. Should foo-mode.el fiddle with auto-mode-alist to add this association, or is that the user's ...
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2answers
167 views

File-local variable to force specific shell for shell-script major mode

I'm having the same problem as asked in this question: emacs is dropping into shell-script mode, but for the wrong shell variant. Using a shebang as suggested in that question's answer is ...
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2answers
157 views

How to load an Idris file that depends on a package?

Working in Spacemacs (on Linux Mint, if that is relevant), using the Idris layer, one of my major mode commands is SPC m-r (Vim-style keybindings): idris-load-file. This causes Spacemacs to load up an ...
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2answers
84 views

ANSI / xterm font-locking

I have a buffer with terminal escape codes in it and I want them to be colored: I was able to do this with (ansi-color-apply-on-region (point-min) (point-max)): However, my file is really big and ...
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1answer
78 views

How should I test my new mode?

I am trying to create a new mode for Emacs lisp, let's call it xyz-mode.el. In testing the mode, I want to re-run xyz-mode.el on a potential target file, let's say abc.xyz. In other words, as I edit ...
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1answer
53 views

use a major mode from the internet

After installing emacs on windows 10 and gone through the tutorial and downloaded a major mode mt4.el , Now where to save it and how to use it in emacs? googling did not help me.
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Determining major mode for proper comment character insertion

I currently have a function like so in my .emacs file: (defun insert-todo () (interactive) (insert "// TODO(map) : ") ) It is bound to my key combination of "C-t". This will work for me if I'...
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1answer
373 views

Where is mhtml mode defined? And why am I getting it by default when I open HTML files?

Under some very special conditions (namely, performing one particular edit in one particular HTML file), my Emacs session will freeze completely, and starts consuming ~100% of the CPU. The only ...
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1answer
49 views

Enable diff-mode for files with diff-ish content

How do I make Emacs automatically turn on diff-mode for any file with diff-looking content, eg. --- a.txt +++ b.txt @@ -1234,56 +1234,56 @@
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1answer
82 views

pressing return in paragraph-indent-text-mode deletes whitespace indenting beginning of paragraph

I'm currently using emacs 25.3 on Mac OSX installed using Homebrew, and without any modifications in my .emacs file or anywhere else. I think I may be fundamentally misunderstanding what paragraph-...
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2answers
107 views

Syntax table to match arbitrary forms with regexp

I'm trying to write a small major-mode for editing pico-8 files in emacs and I had a quick question regarding best practices and matching a somewhat arbitrary form in the pico-8 cartridge files for ...
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161 views

How to add additional comment syntax to a mode?

In general, given a major mode with a defined comment syntax, what do I have to define or change to add a new comment syntax? By "adding", I mean setting some new characters so that they work with ...
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1answer
52 views

derive major mode but do not derive mode hooks

I am trying to reuse lots of things that are built in c-mode for technically another c-like language, including syntactical highlighting and stuff like that. However, c-mode in my settings are ...
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2answers
6k views

How to compile and run a C++ file? [closed]

I don't know how to compile and run a C++ file in GNU Emacs. I searched on the various sites and stackexchange network, but from them what I understood was write something like make compile, and I don'...
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1answer
74 views

Elisp: Inserting Comments

I'm trying to write an elisp program that will insert a section header and footer as a comment. For example, if I need a section called "intro" for my LaTeX document, the following would be inserted: ...
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1answer
187 views

Folding code between a literal “begin”/“end” block using Hideshow

A formatted input file (*.alm) often contains a large section of columned data. To fold this and improve navigation, I've tried to implement a hs-special-mode-alist entry from hideshow.el. (setq hs-...
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How to disable code folding for coq?

When I do isearch on the buffer having coq mode it somehow executes code folding, something like (... *)... I have tried to use (setq company-coq-disabled-features '(code-folding)) for disabling code ...
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1answer
36 views

Is it possible to “protect” strings from formatting?

I'm working on a latex document \documentclass{exam} \printanswers % to use the tag % \usepackage{catchfilebetweentags} % \ExecuteMetaData[file.tex]{tag} %<*afterclass> \begin{document} \...
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2answers
192 views

Enable mode if file content contains a matching string

I would like to enable rjsx-mode whenever a file I open contains a specific string, or a regex like import.*react for example. Is there a way to do something like this in emacs?
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Recommended use of non-file-visiting revert-buffer-function

Summary I am working on a major mode derived from special-mode, which populates its buffers with formatted lists of items retrieved from a web API. Reverting such a buffer involves refetching and ...
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251 views

Enabling Company CAPF backend with timer in Major Mode

I've be working on a new major mode for a DSL. I'm planning to use the CAPF backend for company mode and would like to provide the integration. The completion at point functions produce the correct ...
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80 views

Keyword as comment ender (and starter)

In my previous question I asked about complex comment-start sequence and I think I figured it out, but now I have another problem. Let say we have this mode: (defconst test-font-lock-keywords '(("\\...
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1answer
71 views

Complex comment-start (and end) sequence

As far as I understand there is syntax flags only for comment delimiters made up of two characters but if I have comment delimiters of length greater than two characters is it possible to change ...
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1answer
40 views

.emacs linked to emacs.link,open emacs.link in emacs-lisp mode

Say I have a symbolic link .emacs link to emacs.link,so when I open emacs.link,the associated buffer's major mode is Fundamental mode. I want emacs.link's major mode Emacs-Lisp. Another example is: ...