How to use `use-package` correctly to bind to a custom function?

I have a function `my/tex-command` that relies on the package `tex` and which I want to bind to some key. I handle this with `use-package` as follows: ``` (use-package tex :bind ("C-c C-o C-o" . my/tex-command) :config (defun my/tex-command () (interactive) ;; Stuff )) ``` This works since `tex` is automatically auto-loaded when `my/tex-command` is called. Moreover, the function is defined correctly when `tex` is loaded. However, if I run `(symbol-file 'my/tex-command)` I get back the file `tex.el` instead of the file where I actually defined the function. This is because `load-history` has several entries for `my/tex-command` including ones that associate it to `tex.el` and ones that associate it to the correct files. The result is that my helpful buffers show the wrong file when I look up `my/tex-command`. How do I correctly deal with this situation? I know of two solutions that I want to avoid: - Define a new module which includes `my/tex-command` and which requires `tex` when loaded. This is fine, but it does mean that I have to create many custom modules and I want to have a simpler configuration. - Include `(require tex)` in `my/tex-command` and define it outside the `use-package` statement. I want to avoid having to call `require` commands in functions.

You could use preface for your custom functions. Like [here](https://github.com/Crandel/home/blob/master/.config/emacs/recipes/consult-rcp.el#L56).

[deleted]

Update: It seems that using preface does not autoload the package when my custom command is called. Is that right? How do make sure that the package is autoloaded?

Than you need to use [requires](https://github.com/jwiegley/use-package#prevent-loading-if-dependencies-are-missing)

Thanks @cradlemann. I am not sure how that would help me. What I want is to define my custom command inside the `use-package` of `tex`, so that when it is called the package `tex` is automatically loaded.

You can explicitly tell eMacs to autoload the package [with autoload](https://www.gnu.org/software/emacs/manual/html_node/eintr/Autoload.html) but maybe you can achieve the same by specifying the functions on “:commands”