;;; ravi-init-insertion.el --- inserting text

;; Copyright (C) 2013

;; Author:  <ravi@nero.lan>
;; Keywords:

;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with this program.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; Automatic text insertion

;;; Code:

(require 'autoinsert)
(auto-insert-mode)

(use-package yasnippet
  :init
  (progn
    (setq yas-snippet-dirs
          `(,(ravi/emacs-file "snippets")
            yas-installed-snippets-dir)
          )
    )
  :config
  (progn
    (yas-global-mode 1)

    ;; No dropdowns
    (setq yas/prompt-functions '(yas/ido-prompt yas/completing-prompt))

    ;; Wrap around region
    (setq yas/wrap-around-region t)

    ;; Automatically create throw-away snippets
    (use-package auto-yasnippet
      :bind (("C-<f4>" . aya-create)
             ("<f4>" . aya-expand))
      :ensure t)
    )
  :diminish yas-minor-mode)

;; Default completion (some day via "M-/")
(require 'hippie-exp)
(setq hippie-expand-try-functions-list
  '(yas/hippie-try-expand
    try-expand-dabbrev
    try-expand-dabbrev-all-buffers
    try-expand-dabbrev-from-kill
    try-complete-file-name-partially
    try-complete-file-name
    try-expand-all-abbrevs
    )
  )

(use-package company
  :init
  (progn
    (add-hook 'after-init-hook 'global-company-mode))
  :config
  (progn
    (setq company-tooltip-flip-when-above t
          company-idle-delay 0.1
          company-show-numbers t
          company-tooltip-align-annotations t
          company-require-match nil
          company-minimum-prefix-length 2
          company-occurrence-weight-function 'company-occurrence-prefer-any-closest
          company-dabbrev-downcase nil)
    (defun ravi/complete-or-indent ()
      (interactive)
      (if (company-manual-begin)
          (company-complete-common)
        (indent-according-to-mode)))
    (bind-key "\t" 'ravi/complete-or-indent)

    (bind-keys :map company-active-map
               ("C-n" . company-select-next)
               ("C-p" . company-select-previous)
               ;; Swap filter and search since filter is more useful
               ("C-s" . company-filter-candidates)
               ("C-M-s" . company-search-candidates))
    (bind-keys :map company-search-map
               ("C-n" . company-select-next)
               ("C-p" . company-select-previous))

    (use-package company-c-headers
      :init
      (progn
        (add-to-list 'company-backends 'company-c-headers))
      :config
      (progn
        (defun ravi/get-default-include-paths ()
          (let* ((gcc-out (shell-command-to-string "g++ -E -x c++ - -v < /dev/null"))
                 (gcc-list-match (string-match "#include <...> search starts here:\n\\(.*\\(?:\n.*\\)*?\\)End of search list.\n" gcc-out))
                 (combined-list (match-string 1 gcc-out))
                 ;; Need the following rigamarole to handle paths with spaces in them
                 (path-list-with-spaces (and combined-list (split-string combined-list "\n" t)))
                 (path-list (and path-list-with-spaces (mapcar 's-trim-left path-list-with-spaces))))
            path-list))
        (mapc (lambda (dir) (add-to-list 'company-c-headers-path-system dir)) (ravi/get-default-include-paths))))

    ;; To do: enable when moving to emacs 26+
    ;; (use-package company-box :hook (company-mode . company-box-mode) :ensure t)

    (use-package company-quickhelp
      :config
      (progn
        (company-quickhelp-mode 1)
        ;; Enable company-quickhelp only when company-mode is active
        ;; (unbind-key "M-h" company-quickhelp-mode-map)
        (bind-key "M-h" 'company-quickhelp-manual-begin company-active-map)))

    (use-package company-statistics
      :init
      (setq company-statistics-file (expand-file-name "company-statistics-cache.el"
                                                      (ravi/emacs-file "past")))
      :config
      (progn
        (company-statistics-mode)))

    ;; Get rid of company-semantic as it interferes with clang-based backends
    (setq company-backends (delete 'company-semantic company-backends))
    ;; Get rid of company-clang since it is too noisy at this point
    (setq company-backends (delete 'company-clang company-backends))

    (require 'company-yasnippet)
    (defun ravi/company-to-yasnippet ()
      (interactive)
      (company-abort)
      (call-interactively 'company-yasnippet))
    (bind-key "<backtab>" 'ravi/company-to-yasnippet company-active-map)
    (bind-key "<backtab>" 'company-yasnippet))

  :diminish company-mode)

(provide 'ravi-init-insertion)
;;; ravi-init-insertion.el ends here