[tern] Remove unmaintained package company-tern

Company tern is not longer on melpa and had to be removed.
See #13725 for details.

layers/+frameworks/react/README.org

@@ -13,7 +13,7 @@
   - [[#rjsx-mode][rjsx-mode]]
   - [[#formatting-web-beautify][Formatting (web-beautify)]]
     - [[#documentation-js-doc][Documentation (js-doc)]]
-  - [[#auto-complete-and-documentation-tern][Auto-complete and documentation (tern)]]
+  - [[#documentation-tern][Documentation (tern)]]
 
 * Description
 ES6 and JSX ready configuration layer for React
@@ -151,7 +151,7 @@ You can check more [[https://github.com/mooz/js-doc/][here]]
 | ~SPC m r d t~ | insert tag to comment                 |
 | ~SPC m r d h~ | show list of available jsdoc tags     |
 
-** Auto-complete and documentation (tern)
+** Documentation (tern)
 
 | Key binding   | Description                                                                              |
 |---------------+------------------------------------------------------------------------------------------|

layers/+frameworks/react/funcs.el

@@ -21,7 +21,6 @@
 (defun spacemacs//react-setup-company ()
   "Conditionally setup company based on backend."
   (pcase javascript-backend
-    (`tern (spacemacs/tern-setup-tern-company 'rjsx-mode))
     (`tide (spacemacs//tide-setup-company 'rjsx-mode))))
 
 (defun spacemacs//react-setup-next-error-fn ()

layers/+lang/javascript/funcs.el

@@ -30,7 +30,6 @@
 (defun spacemacs//javascript-setup-company ()
   "Conditionally setup company based on backend."
   (pcase (spacemacs//javascript-backend)
-    (`tern (spacemacs//javascript-setup-tern-company))
     (`tide (spacemacs//tide-setup-company 'js2-mode))))
 
 (defun spacemacs//javascript-setup-dap ()
@@ -71,13 +70,6 @@
     (message (concat "Tern was configured as the javascript backend but "
                      "the `tern' layer is not present in your `.spacemacs'!"))))
 
-(defun spacemacs//javascript-setup-tern-company ()
-  (if (configuration-layer/layer-used-p 'tern)
-      (when (locate-file "tern" exec-path)
-        (spacemacs/tern-setup-tern-company 'js2-mode))
-    (message (concat "Tern was configured as the javascript backend but "
-                     "the `tern' layer is not present in your `.spacemacs'!"))))
-
 
 ;; js-doc
 
@@ -154,7 +146,7 @@
     (call-interactively 'web-beautify-js))
    (t (error (concat "%s isn't valid javascript-fmt-tool value."
                      " It should be 'web-beutify or 'prettier.")
-                     (symbol-name javascript-fmt-tool)))))
+             (symbol-name javascript-fmt-tool)))))
 
 (defun spacemacs/javascript-fmt-before-save-hook ()
   (add-hook 'before-save-hook 'spacemacs/javascript-format t t))

layers/+tools/tern/config.el

@@ -1,6 +1,6 @@
 ;;; config.el --- Tern Layer configuration File for Spacemacs
 ;;
-;; Copyright (c) 2012-2018 Sylvain Benner & Contributors
+;; Copyright (c) 2012-2020 Sylvain Benner & Contributors
 ;;
 ;; Author: Sylvain Benner <sylvain.benner@gmail.com>
 ;; URL: https://github.com/syl20bnr/spacemacs

layers/+tools/tern/funcs.el

@@ -1,6 +1,6 @@
 ;;; funcs.el --- Tern Layer functions File for Spacemacs
 ;;
-;; Copyright (c) 2012-2018 Sylvain Benner & Contributors
+;; Copyright (c) 2012-2020 Sylvain Benner & Contributors
 ;;
 ;; Author: Sylvain Benner <sylvain.benner@gmail.com>
 ;; URL: https://github.com/syl20bnr/spacemacs
@@ -16,14 +16,3 @@ Must be called by a layer using tern."
   (when tern-disable-port-files
     (add-to-list 'tern-command "--no-port-file" 'append))
   (tern-mode))
-
-(defun spacemacs/tern-setup-tern-company (&rest modes)
-  "Setup tern auto-completion for given MODES.
-Must be called by a layer using tern."
-  (eval `(spacemacs|add-company-backends
-           :backends company-tern
-           :modes ,@modes
-           :append-hooks nil
-           :call-hooks t))
-  (company-mode)
-  (tern-mode))

layers/+tools/tern/packages.el

@@ -1,6 +1,6 @@
 ;;; packages.el --- Tern Layer packages File for Spacemacs
 ;;
-;; Copyright (c) 2012-2018 Sylvain Benner & Contributors
+;; Copyright (c) 2012-2020 Sylvain Benner & Contributors
 ;;
 ;; Author: Sylvain Benner <sylvain.benner@gmail.com>
 ;; URL: https://github.com/syl20bnr/spacemacs
@@ -9,12 +9,8 @@
 ;;
 ;;; License: GPLv3
 
-(setq tern-packages '((company-tern :requires company)
-                      tern))
-
-(defun tern/init-company-tern ()
-  (use-package company-tern
-    :defer t))
+(defconst tern-packages
+  '(tern))
 
 (defun tern/init-tern ()
   (use-package tern