First commit.

lisp/utilities/lsp.el

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+;;; lsp.el --- Language server protocol. -*- lexical-binding: t; -*-
+;;; Commentary:
+;;; Code: https://github.com/emacs-lsp/lsp-mode
+
+(defun user--lsp-mode-hook ()
+  "Mode hook for LSP minor modes."
+  (message "user--lsp-mode-hook"))
+
+(use-package lsp-mode
+  :pin "MELPA"
+  :commands lsp
+  :hook ((lsp-after-open-hook . lsp-enable-imenu)
+         (lsp-mode-hook . user--lsp-mode-hook))
+  :config
+  (validate-setq
+   ;; Automatically try to figure out project root.
+   lsp-auto-guess-root t
+   ;; Location of persistent LSP session.
+   lsp-session-file (path-join *user-cache-directory* "lsp-session")
+   ;; Disable yasnippet integration.
+   lsp-enable-snippet nil
+   ;; Don't watch files for changes, prevents freeze during compilation.
+   lsp-enable-file-watchers nil
+   ;; Disable headerline
+   lsp-headerline-breadcrumb-enable nil
+   ;; Increase the amount of data that can be read from a language server.
+   read-process-output-max (* 3 1024 1024))
+
+  ;; https://github.com/emacs-lsp/lsp-ui/
+  ;; This package contains all the higher level UI modules of lsp-mode, like flycheck support and code lenses.
+  (use-package lsp-ui
+    :hook (lsp-mode-hook . lsp-ui-mode)
+    :config
+    ;; https://emacs-lsp.github.io/lsp-mode/tutorials/how-to-turn-off/
+    (validate-setq
+     lsp-modeline-code-actions-enable nil
+     lsp-ui-sideline-enable nil
+     lsp-ui-doc-delay 3
+     lsp-ui-doc-position 'bottom))
+
+  (use-package lsp-treemacs
+    :ensure t
+    :defer t
+    ;; :after (lsp treemacs)
+    :custom
+    (lsp-treemacs-sync-mode 1)
+    )
+  )
+
+(provide 'utilities/lsp)
+;;; lsp.el ends here