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;; install package
(require-package 'go-mode)
(require 'go-mode)
(defun go-mode-create-imenu-index ()
"Create and return an imenu index alist. Unlike the default
alist created by go-mode, this method creates an alist where
items follow a style that is consistent with other prog-modes."
(let* ((patterns '(("type" "^type *\\([^ \t\n\r\f]*\\)" 1)))
(type-index (imenu--generic-function patterns))
(func-index))
(save-excursion
(goto-char (point-min))
(while (re-search-forward go-func-meth-regexp (point-max) t)
(let* ((var (match-string-no-properties 1))
(func (match-string-no-properties 2))
(name (if var
(concat (substring var 0 -1) "." func)
func))
(beg (match-beginning 0))
(marker (copy-marker beg))
(item (cons name marker)))
(setq func-index (cons item func-index)))))
(nconc type-index (list (cons "func" func-index)))))
(defun go-mode-create-flat-imenu-index ()
"Return a flat imenu index alist. See `go-mode-create-imenu-index'."
(apply 'nconc (mapcar 'cdr (go-mode-create-imenu-index))))
(add-hook 'go-mode-hook
(lambda ()
;; C-c p runs gofmt on the buffer
(define-key go-mode-map (kbd "C-c p") 'gofmt)
;; adjust fill-column
(setq-local fill-column 120)
;; use flat imenu index
(setq-local imenu-create-index-function
#'go-mode-create-flat-imenu-index)))
;; run gofmt before saving file
(add-hook 'before-save-hook 'gofmt-before-save)
;; configure company-mode
;; requires https://github.com/nsf/gocode for the backend
(when (and (featurep 'company) (featurep 'company-go))
(add-hook 'go-mode-hook (lambda ()
(setq-local company-backends '(company-go))
(company-mode))))
;; use goimports if available
(when (executable-find "goimports")
(setq gofmt-command "goimports"))
(provide 'init-go-mode)
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