swap mode-line and header-line

Hello reddit ! I am trying to swap the modeline with the headerline completely. For now I use this snippet of code to have my modeline in my headerline and vice-versa : ``` (defvar og-modeline mode-line-format) (setq-default mode-line-format header-line-format) (setq-default header-line-format og-modeline) ``` This works well except that I'd like to see the empty modeline (as a separator) but it doesn't show because header-line-format is empty. Is it possible to have an empty string and keep the header-line-format ? My other problem is that lsp-headerline still shows in the real header-line which I don't want to. Do you know how I could move it down there ? Maybe there is a better way to swap the modeline and the headerline ? Thank you for your help

> Is it possible to have an empty string and keep the header-line-format Have you tried a space in there rather than empty string? > My other problem is that lsp-headerline still shows in the real header-line which don't want to I would study the code from your LSP client that is responsible for the header-line and see how difficult it is to customize `mode-line-format` instead of `header-line-format`

>Have you tried a space in there rather than empty string? I did and it works, there is now an empty mode-line. >I would study the code from your LSP client that is responsible for the mode-line Good suggestion, I went check the code that generates the headline and in fact, it does append to the current header-line-format their things. I guess changing this to \`mode-line-format\` instead would fix it. ​ What would be the best way to override a package-defined function ? EDIT : maybe swapping the references would do the job in a cleaner manner ? I mean redirect every action applied on header-line-format affect mode-line-format instead and vice-versa

You can *advise* an existing function in many different ways https://www.gnu.org/software/emacs/manual/html_node/elisp/Advising-Functions.html

I didn't know this was a feature, I'll have a look thanks !