how to configure doom emacs (generic emacs too) with a C project
reddit / emacs

----------------------------------------------------------------------
crazyjoker96 · 2022-09-05 00:44

I found always frustrating that m emacs is not able to find the struct
or function that I define in another file because my emacs
configuration (from today's doom emacs configuration) is too basic to
make me productive with emacs.

There are some suggestions on how I can make a good configuration of
my emacs for a pure C project?

----------------------------------------------------------------------
Ambitious-One-5860 · 2022-09-05 04:51

[Tree Sitter](https://github.com/emacs-tree-sitter/elisp-tree-sitter)
and [lsp-mode](https://emacs-lsp.github.io/lsp-mode/tutorials/CPP-
guide/) might be of help. Looks like both take a bit of work to get
going. I have personally not used them, so try out which suits you and
let us know how it went.

----------------------------------------------------------------------
Soupeeee · 2022-09-05 08:08

lsp-mode is the way to go. Assuming you are on Linux, it's really easy
to install and get working. You do need to configure your build system
to create a `compile-commands.json` file an place it in your project's
root directory for projects that have more than one file. I've also
had better luck using `clang` as the compiler and `clangd` as the
language server instead of gcc for whatever reason.

Here's how to install it:

1. Install `clangd` and related LLVM tools
2. Install and configure lsp-mode. Here's the config I have using
`use-package`:

​

    (use-package lsp-mode
        :commands lsp
        :ensure t
        :config (setq lsp-prefer-flymake nil)
        :hook ((c-mode c++-mode rust-mode objc-mode) . (lambda ()
(lsp))))

3. Install \`company-mode\` and turn it on to get a  more IDE-like
auto completion:

    (use-package company
      :config
      (setq company-minimum-prefix-length 1)
      (setq company-idle-delay 0.1)
      (setq company-backends '(company-elisp
                           company-cmake
                           company-capf
                           company-files
                           (company-dabbrev-code company-gtags
company-etags company-keywords)
                           company-oddmuse
                           company-dabbrev))
      :ensure t)

When you open a C file, you should get asked some questions about how
to find the project configuration. After that, everything should just
work.

----------------------------------------------------------------------
crazyjoker96 · 2022-09-05 08:55

Thanks! I will try this later :)

----------------------------------------------------------------------
redguardtoo · 2022-09-05 12:46

`counsel-etags` for code navigation `company-ctags` for code
completion

Both requires command line tool ctags (universal-ctags is
recommended).

----------------------------------------------------------------------
crazyjoker96 · 2022-09-05 13:12

do you have any tips to configure ctags?

----------------------------------------------------------------------
redguardtoo · 2022-09-05 13:48

I don't have any special setup for universal-ctags which already
supports C and many other languages out of box.

----------------------------------------------------------------------
crazyjoker96 · 2022-09-05 22:11

works like a charm!

----------------------------------------------------------------------
Ok-Analysis-7820 · 2022-09-05 23:21

If you're on doom, go to the init ~/.doom.d/init and find the
programming language you want to set up, c or whatever. Add a
parenthesis at the beginning and add lsp after the c (remove the ; )
so (c +lsp) whatever. If you push K and look at the flags you can see
what might be needed

----------------------------------------------------------------------
crazyjoker96 · 2022-09-06 12:46

Mh no for autosuggestion I need the addition before!