treemacs integration does not work in terminal

[Follpvosten]

Running (require 'lsp-java-treemacs) without a GUI results in the following error: (void-variable treemacs-icon-java)

This is because the PNG icon variables are not set when running Emacs without a graphical environment, because it's impossible there; see https://github.com/Alexander-Miller/treemacs/blob/master/src/elisp/treemacs-icons.el#L31

[yyoncho]

Thanks for reporting, I guess I will have to use something like the code in treemacs--setup-tui-icons .
(cc @Alexander-Miller )

[Alexander-Miller]

I guess I will have to use something like the code in treemacs--setup-tui-icons

Yes, you'll need something like this, too.

On a side note: that doesn't just happen because you run emacs in a terminal. The png icons will not be created only when they cannot be created. That should only happen when your emacs was compiled without support for png images, or similarly exceptional situations.

Either way properly handling terminal fallback icons does add another layer of complexity to the extensions api, so I'll be putting this on my todo list.

[yyoncho]

Here it is how it looks like after the fix: