spacemacs/contrib/gtags/packages.el

;;; packages.el --- gtags Layer packages File for Spacemacs
;;
;; Copyright (c) 2012-2014 Sylvain Benner
;; Copyright (c) 2014-2015 Sylvain Benner & Contributors
;;
;; Author: Sylvain Benner <sylvain.benner@gmail.com>
;; URL: https://github.com/syl20bnr/spacemacs
;;
;; This file is not part of GNU Emacs.
;;
;;; License: GPLv3

(setq gtags-packages
  '(
    ;; package gtagss go here
    helm-gtags
    ggtags
    ))

;; For each package, define a function gtags/init-<package-gtags>
;;
(defun spacemacs/gtags-define-keys-for-mode (mode)
  "Define key bindings for the specific MODE."
  (when (fboundp mode)
    (let ((hook (intern (concat (symbol-name mode) "-hook"))))
      (message "hook is %s" hook)
      (add-hook hook 'helm-gtags-mode)
      (unless (member mode '(c-mode
                             c++-mode
                             lisp-mode
                             emacs-lisp-mode
                             python-mode
                             ruby-mode))
        (add-hook hook (lambda ()
                         (ggtags-mode 1)
                         (eldoc-mode 1)
                         (setq-local eldoc-documentation-function #'ggtags-eldoc-function)))))

    (evil-leader/set-key-for-mode mode
      "mgc" 'helm-gtags-create-tags
      "mgd" 'helm-gtags-find-tag
      "mgf" 'helm-gtags-select-path
      "mgg" 'helm-gtags-dwim
      "mgi" 'helm-gtags-tags-in-this-function
      "mgl" 'helm-gtags-parse-file
      "mgn" 'helm-gtags-next-history
      "mgp" 'helm-gtags-previous-history
      "mgr" 'helm-gtags-find-rtag
      "mgR" 'helm-gtags-resume
      "mgs" 'helm-gtags-select
      "mgS" 'helm-gtags-show-stack
      "mgu" 'helm-gtags-update-tags)))

(defun gtags/init-ggtags ()
  (use-package ggtags
    :defer t))

(defun gtags/init-helm-gtags ()
  (use-package helm-gtags
    :defer t
    :init
    (progn
      (setq helm-gtags-ignore-case t
            helm-gtags-auto-update t
            helm-gtags-use-input-at-cursor t
            helm-gtags-pulse-at-cursor t)
      ;; modes that do not have a layer, define here
      (spacemacs/gtags-define-keys-for-mode 'tcl-mode)
      (spacemacs/gtags-define-keys-for-mode 'java-mode)
      (spacemacs/gtags-define-keys-for-mode 'vhdl-mode)
      (spacemacs/gtags-define-keys-for-mode 'shell-script-mode)
      (spacemacs/gtags-define-keys-for-mode 'awk-mode)
      (spacemacs/gtags-define-keys-for-mode 'asm-mode)
      (spacemacs/gtags-define-keys-for-mode 'dired-mode)
      )
    :config
    (progn
      ;; if anyone uses helm-gtags, they would want to use these key bindings
      (define-key helm-gtags-mode-map (kbd "M-.") 'helm-gtags-dwim)
      (define-key helm-gtags-mode-map (kbd "C-x 4 .") 'helm-gtags-find-tag-other-window)
      (define-key helm-gtags-mode-map (kbd "M-,") 'helm-gtags-pop-stack)
      (define-key helm-gtags-mode-map (kbd "M-*") 'helm-gtags-pop-stack))))