Improve go-mode support

Cask

@@ -132,6 +132,9 @@
 ;; C#
 (depends-on "csharp-mode")
 (depends-on "omnisharp")
+;; Golang
+(depends-on "go-mode")
+(depends-on "go-eldoc")
 ;; Java
 (depends-on "emacs-eclim")
 (depends-on "groovy-mode")
@@ -144,7 +147,6 @@
 ;;(depends-on "org-plus-contrib")
 ;;(depends-on "org-opml" :git "https://github.com/edavis/org-opml")
 ;; Other
-(depends-on "go-mode")
 (depends-on "swift-mode")
 (depends-on "vimrc-mode")
 (depends-on "crystal-mode" :git "https://github.com/jpellerin/emacs-crystal-mode/")

modules/module-go.el

@@ -3,8 +3,28 @@
 (use-package go-mode
   :mode "\\.go$"
   :interpreter "go"
+  :init (add-hook! go-mode 'emr-initialize)
   :config
-  (bind! :map go-mode-map :n "gd" 'godef-jump)
+  (bind! :map go-mode-map
+         :n "gd" 'godef-jump
+         :n "gD" 'godef-describe)
+
+  (mapc (lambda (x)
+          (let ((command-name (car x))
+                (title (cadr x))
+                (region-p (caddr x))
+                predicate)
+            (setq predicate (cond ((eq region-p 'both) nil)
+                                  (t (if region-p
+                                         (lambda () (use-region-p))
+                                       (lambda () (not (use-region-p)))))))
+            (emr-declare-command (intern (symbol-name command-name))
+              :title title :modes 'go-mode :predicate predicate)))
+        '((go-remove-unused-imports "Remove unushed imports" nil)
+          (gofmt                    "Format code" nil)))
+
+  (use-package go-eldoc
+    :config (add-hook! go-mode 'go-eldoc-setup))
 
   (use-package company-go
     :config