emacs/prog: switch to lsp-mode

Previously I was using the package `eglot` to provide LSP functionality.
However, the package uses flymake for it, while my setup in general uses
flycheck. Since lsp-mode supports both, I'm switching to ls-mode.

I'm moving the code for company to the 'prog' module, so that all things
related to general programming is in one location.

Since I'm switching to lsp-mode mode primarily for go, I can also delete
a bunch of extra functionality that is now provided by lsp-mode.

1 files changed, 35 insertions, 5 deletions

diff --git a/emacs.d/custom/fcuny-prog.el b/emacs.d/custom/fcuny-prog.el
index ab7cc05..92dd9c7 100644
--- a/emacs.d/custom/fcuny-prog.el
+++ b/emacs.d/custom/fcuny-prog.el
@@ -1,9 +1,39 @@
-(use-package eglot
+(require 'fcuny-vars)
+
+(use-package company
+  :ensure t
+  :diminish company-mode
+
+  :custom
+  (company-minimum-prefix-length 2)
+  (company-tooltip-align-annotations t)
+  (company-tooltip-limit 12)
+  (company-idle-delay 1))
+
+(use-package lsp-mode
+  :ensure t
+  :commands (lsp lsp-deferred)
+  :hook (go-mode . lsp-deferred)
+  :custom
+  (lsp-session-file (expand-file-name "lsp-session-v1" fcuny/path-emacs-var))
+  (lsp-enable-snippet nil)
+  (lsp-prefer-flymake nil))
+
+(use-package lsp-ui
+  :ensure t
+  :commands lsp-ui-mode
+  :custom
+  (lsp-ui-doc-enable t)
+  (lsp-ui-peek-enable t)
+  (lsp-ui-sideline-enable t)
+  (lsp-ui-imenu-enable t)
+  (lsp-ui-flycheck-enable t))
+
+(use-package company-lsp
   :ensure t
+  :after company
+  :commands company-lsp
   :config
-  (define-key eglot-mode-map (kbd "C-c ; g .") 'xref-find-definitions)
-  (define-key eglot-mode-map (kbd "C-c ; g ,") 'pop-tag-mark)
-  (add-to-list 'eglot-server-programs '(go-mode . ("gopls")))
-  (add-hook 'go-mode-hook 'eglot-ensure))
+  (push 'company-lsp company-backends))
 
 (provide 'fcuny-prog)