+ Lsp-Mode:
    - https://github.com/emacs-lsp/lsp-mode
    - https://melpa.org/#/lsp-mode

  #+BEGIN_SRC emacs-lisp
    (defcustom mydot-emacs-enable-lsp nil
      "Whether to enable Emacs LSP integration."
      :group 'mydot-emacs
      :type 'boolean)
  #+END_SRC

  #+BEGIN_SRC emacs-lisp
    (defcustom mydot-emacs-lsp-exceptions '(ebuild-mode)
      "List of modes where Emacs LSP integration should not be enabled."
      :group 'mydot-emacs
      :type '(repeat symbol))
  #+END_SRC

  #+BEGIN_SRC emacs-lisp
    (defun maybe-enable-lsp ()
      "Enable LSP mode for a buffer if all requirements are satisfied."
      (cond
       ;; Short-circuit.
       ((not mydot-emacs-enable-lsp)
        nil)
       ;; Mode exceptions.
       ((member major-mode mydot-emacs-lsp-exceptions)
        nil)
       ;; Enable LSP for projects.
       ((and (fboundp 'projectile-project-p)
             (fboundp 'lsp-deferred)
             (projectile-project-p))
        (lsp-deferred))
       ;; Base.
       (t
        nil)))
  #+END_SRC

  #+BEGIN_SRC emacs-lisp
    (use-package lsp-mode
      :hook
      ((c-mode . maybe-enable-lsp)
       (c++-mode . maybe-enable-lsp)
       (csharp-mode . maybe-enable-lsp)
       (fsharp-mode . maybe-enable-lsp)
       (js-mode . maybe-enable-lsp)
       (markdown-mode . maybe-enable-lsp)
       (powershell-mode . maybe-enable-lsp)
       (rust-mode . maybe-enable-lsp)
       (sh-mode . maybe-enable-lsp)
       (typescript-mode . maybe-enable-lsp)
       (yaml-mode . maybe-enable-lsp)
       (lsp-mode . lsp-diagnostics-mode)
       (lsp-mode . lsp-enable-which-key-integration))
      :commands (lsp lsp-deferred)
      :custom
      ((lsp-eldoc-render-all t)
       (lsp-keep-workspace-alive nil)
       (lsp-modeline-workspace-status-enable nil)
       (lsp-response-timeout 15)
       (lsp-tcp-connection-timeout 15))
      :config
      (progn
        (mapc (lambda (f)
                (add-to-list 'lsp-file-watch-ignored-directories f))
              '("[/\\\\]\\.cache\\'"
                "[/\\\\]\\.log\\'"
                "[/\\\\]\\compiled\\'"))))
  #+END_SRC

  #+BEGIN_SRC emacs-lisp
    (use-package lsp-lens
      :hook ((lsp-mode . lsp-lens-mode))
      :diminish lsp-lens-mode)
  #+END_SRC