;;; ravi-init-navigation.el --- navigation utilities

;; 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:

;; Buffer navigation utilities

;;; Code:

(use-package region-bindings-mode
  :init (region-bindings-mode-enable)
  :config
  (progn
    (bind-key "f" 'forward-word region-bindings-mode-map)
    (bind-key "b" 'backward-word region-bindings-mode-map)

    ;; HJKL cluster to replace arrow keys
    (bind-key "h" 'backward-char region-bindings-mode-map)
    (bind-key "l" 'forward-char region-bindings-mode-map)
    (bind-key "j" 'previous-line region-bindings-mode-map)
    (bind-key "k" 'next-line region-bindings-mode-map)

    ;; Most of the time, we mark regions to copy
    (bind-key "w" 'kill-ring-save region-bindings-mode-map)
    )
  :ensure t
  )

(use-package ace-jump-mode
  :bind ("M-h" . ace-jump-mode)
  :ensure t
  )

(use-package imenu-anywhere
  :bind ("s-." . imenu-anywhere)
  :ensure t
  )

(use-package expand-region
  :bind ("C-=" . er/expand-region)
  :ensure t
  )

(use-package multiple-cursors
  :bind (("C-S-c C-S-c" . mc/edit-lines)

         ("C->"     . mc/mark-next-like-this)
         ("C-<"     . mc/mark-previous-like-this)
         ("C-c C-<" . mc/mark-all-like-this))
  :init
  (progn
    (setq mc/list-file (ravi/emacs-file "past/mc-lists.el"))
    (bind-key "a" 'mc/mark-all-like-this region-bindings-mode-map)
    (bind-key "p" 'mc/mark-previous-like-this region-bindings-mode-map)
    (bind-key "n" 'mc/mark-next-like-this region-bindings-mode-map)
    (bind-key "m" 'mc/mark-more-like-this-extended region-bindings-mode-map)
    )
  :ensure t
  )

(use-package fold-this
  :commands fold-this
  :init
  (progn
    (bind-key "t" 'fold-this region-bindings-mode-map))
  :ensure t
  )

(use-package indirect
  :commands indirect-region
  :init
  (progn
    (bind-key "I" 'indirect-region region-bindings-mode-map))
  )

(use-package visual-regexp
  :bind (("C-c r" . vr/replace)
         ("C-c q" . vr/query-replace)
         ("C-c m" . vr/mc-mark))
  :ensure t
  )

(use-package god-mode
  :bind (("<escape>" . god-local-mode))
  :ensure t
  )

(bind-key "<M-f6>" 'ff-find-other-file)

(setq compilation-scroll-output 'first-error)

(use-package smartparens
  :commands (smartparens-mode show-smartparens-mode)
  :init
  (show-smartparens-global-mode 1)
  :config
  (progn
    (require 'smartparens-config)
    (add-hook 'emacs-lisp-mode-hook 'smartparens-mode)
    (add-hook 'emacs-lisp-mode-hook 'sp-use-smartparens-bindings)
    )
  :ensure t
  )

;; Marking and moving lines

(defun ravi/pull-up-a-line()
  "Pull up the next line"
  (interactive)
  (join-line -1)
  )

(bind-key "M-j" 'ravi/pull-up-a-line)

(use-package move-lines
  :bind (("<S-down>" . move-lines-down)
         ("<S-up>" . move-lines-up)
         )
  )

;; From Kyle Sherman's comment at
;; http://emacs-fu.blogspot.com/2010/01/duplicating-lines-and-commenting-them.html
;; \todo Make this work someday with regions too.
(defun ravi/kyle-sherman-duplicate-line (&optional comment line)
  "Duplicate the line containing the point.
\nIf COMMENT is non-nil, also comment out the original line.
 If LINE is non-nil, duplicate that line instead."
  (interactive "P")
  (let ((col (current-column)))
    (save-excursion
      (when line
        (goto-line line))
      (let ((line (buffer-substring (point-at-bol) (point-at-eol))))
        (when comment
          (comment-region (point-at-bol) (point-at-eol)))
        (goto-char (point-at-eol))
        (if (eobp)
            (newline)
          (forward-line 1))
        (open-line 1)
        (insert line)))
    (forward-line 1)
    (move-to-column col)))

;; C-: duplicates line, C-u C-: comments first line
(bind-key "C-:" 'ravi/kyle-sherman-duplicate-line)

(defun ravi/back-to-indentation-or-beginning () (interactive)
   (if (= (point) (progn (back-to-indentation) (point)))
       (beginning-of-line)))
(bind-key "C-a" 'ravi/back-to-indentation-or-beginning)

(defun ravi/Fuco-point-in-comment ()
  "Determine if the point is inside a comment"
  (interactive)
  (let ((syn (syntax-ppss)))
    (and (nth 8 syn)
         (not (nth 3 syn)))))

(defun ravi/Fuco-end-of-code-or-line+ (arg)
  "Move to the end of code. If already there, move to the end of line,
  that is after the possible comment. If at the end of line, move to the
  end of code.

  Comments are recognized in any mode that sets syntax-ppss properly."
  (interactive "P")
  (let ((eoc (save-excursion
               (move-end-of-line arg)
               (while (ravi/Fuco-point-in-comment)
                 (backward-char))
               (skip-chars-backward " \t")
               (point))))
    (cond ((= (point) eoc)
           (move-end-of-line arg))
          (t
           (move-end-of-line arg)
           (while (ravi/Fuco-point-in-comment)
             (backward-char))
           (skip-chars-backward " \t")))))
(bind-key "C-e" 'ravi/Fuco-end-of-code-or-line+)

;; Use current line for region-based commands if no region selected
(use-package whole-line-or-region
  :config
  (progn
    (defun turn-on-whole-line-or-region-mode()
      (interactive)
      (whole-line-or-region-mode 1)
      )
    (add-hook 'prog-mode-hook 'turn-on-whole-line-or-region-mode)
    )
  :diminish whole-line-or-region-mode
  )

;; grep and friends

(use-package wgrep
  :ensure t
  )

(let ((ad-redefinition-action 'accept))
  (use-package color-moccur
    :commands (isearch-moccur isearch-all)
    :bind ("M-s O" . moccur)
    :init
    (progn
      (bind-key "M-o" 'isearch-moccur isearch-mode-map)
      (bind-key "M-O" 'isearch-moccur-all isearch-mode-map))

    :config
    (use-package moccur-edit)

    :ensure t
    )
  )

;; Search the web
(use-package webjump
  :bind ("C-x g" . webjump)
  :config
  (progn
    ;; Suggest word at point if possible
    (defun webjump-read-string (prompt)
      (let* ((prompt (concat prompt (if (word-at-point) (concat " (default: " (word-at-point) ")")) ": "))
             (input (read-string prompt)))
        (if (webjump-null-or-blank-string-p input) (word-at-point) input)))

    ;; C++ reference
    (add-to-list 'webjump-sites
                 '("cpp" . [simple-query "en.cppreference.com"
                                         "http://en.cppreference.com/mwiki/index.php?title=Special:Search&search="
                                         ""]))
    )
  )

;; to do: add zeal-at-point

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