;;; lsp.el --- Language Server Protocol.             -*- lexical-binding: t; -*-

;; Time-stamp: <2020-01-27T02:10:04+0100>

;;; Commentary:

;;; Code:

(require 'basics/global-variables)

(unless slow-computer
  ;; Client for Language Server Protocol servers.
  (use-package lsp-mode
    :if (executable-find "clangd")
    :after (whitespace)
    :defines (lsp-clients-clangd-args)

    :custom
    (lsp-prefer-flymake nil)            ; Disable flymake.
    (lsp-auto-guess-root t)             ; Don't ask for project root.
    (lsp-eldoc-render-all t)            ; Display all eldoc information.

    :config
    (setq lsp-clients-clangd-args '("--compile-commands-dir=build"))
    ;; Add “-clang-tidy” to clangd args if the version supports it.
    (when (>= (my/clangd-version) 9.0)
      (add-to-list 'lsp-clients-clangd-args "--clang-tidy" t))

    ;; Mark lsp-clients-clangd-args as safe to override.
    (put 'lsp-clients-clangd-args 'safe-local-variable #'consp)

    (defun my/lsp-ws-toggle ()
      (if lsp-ui-peek-mode
          (my/whitespace-mode-off)
        (my/whitespace-mode-on)))

    :hook
    (c++-mode . lsp)
    (c-mode . lsp)
    (lsp-ui-peek-mode . my/lsp-ws-toggle) ; Dots in wrong color.
    )

  ;; Eye-candy and flycheck support for lsp-mode.
  (use-package lsp-ui
    :after (lsp-mode flycheck)

    :custom
    (lsp-ui-sideline-enable nil)        ; Do not insert doc into buffer.
    (lsp-ui-doc-include-signature t)    ; Include signature in doc popup.
    (lsp-ui-doc-enable nil)             ; Disable doc popup.

    :bind
    (:map lsp-ui-mode-map
          ("M-." . lsp-ui-peek-find-definitions)
          ("C-M-." . lsp-ui-peek-find-references)
          ("C-M-," . lsp-ui-peek-find-implementation)
          )

    :hook
    (lsp-mode . lsp-ui-mode)
    )

  ;; Completions with lsp-mode.
  (use-package company-lsp
    :after (lsp-mode company)

    :config
    (push 'company-lsp company-backends)
    )

  ;; ivy interface to lsp-mode.
  (use-package lsp-ivy
    :after (lsp-mode ivy)
    )

  ;; Integration between lsp-mode and treemacs.
  (use-package lsp-treemacs
    :after (treemacs lsp-ui)

    :bind
    (:map lsp-ui-mode-map
          ("<f7>" . lsp-treemacs-errors-list) ; Use treemacs for error list.
          ("M-i" . lsp-treemacs-symbols)      ; Display symbols using treemacs.
          )
    )
  ) ; unless slow-computer.

(provide 'programming/lsp)
;;; lsp.el ends here