(defun hexo-deploy (dir)
  "Deploy hexo site.
If called with a prefix argument, the user is asked for directory of
the site. Otherwise, the directory is guessed from
`default-directory'."
  (interactive (list (if current-prefix-arg
		   (file-name-as-directory
		    (read-directory-name "Hexo site directory: "
					 default-directory))
		 default-directory)))
  (let ((old-dir default-directory))
    (if (file-exists-p (concat dir "db.json"))
	(progn
	  (setq default-directory dir)
	  (start-process "hexo-deploy" "*Hexo Deploy Output*" "hexo" "d" "-g")
	  (setq default-directory old-dir))
      (progn
	(if (file-exists-p (expand-file-name
			    (concat old-dir "../../db.json")))
	    (progn
	      (setq default-directory (expand-file-name
			    (concat old-dir "../../")))
	      (start-process "hexo-deploy"
			     "*Hexo Deploy Output*" "hexo" "d" "-g")
	      (setq default-directory old-dir))
	  (error "Hexo deploy failed. Wrong directory?"))))))

(defun hexo-wait-and-visit (proc max)
  "Use timer to wait hexo process finish then visit the created file."
  (if (eq (process-status proc) 'exit)
      ;; Exit normally.
      (let ((hexo-buffer (process-buffer proc)))
	(set-buffer hexo-buffer)
	(goto-char (point-min))
	(if (search-forward "File created at " nil t 1)
	    (progn
	      (find-file (buffer-substring-no-properties (point) (line-end-position)))
	      (kill-buffer hexo-buffer))))
    (when (< max 5)
	(run-with-timer 1 nil `(lambda () (funcall 'hexo-wait-and-visit ,proc ,(1+ max)))))))

(defun hexo-new (dir type title)
  "Create an hexo draft/page/photo/post/.
If called with a prefix argument, the user is asked for type of the
created item. By default, `tpye' is post."
  (interactive
   (list (file-name-as-directory
	  (read-directory-name "Hexo site directory: "
			       default-directory))
   (if current-prefix-arg
       (read-string "Type to create: " "post" nil "post")
     "post")
   (read-string "title: ")))
  (let ((old-dir default-directory))
    (if (and (file-exists-p (concat dir "db.json"))
	     title)
	(progn
	  (setq default-directory dir)
	  (hexo-wait-and-visit (start-process "hexo-new" "*Hexo New Output*" "hexo" "n" type title) 0)
	  (setq default-directory old-dir)
	  )
      (error "Input directory is wrong."))))

(defun get-dir (dir)
  "This function can be called non-interactively and interactively."
  (interactive (list (if current-prefix-arg
		   (file-name-as-directory
		    (read-directory-name "A directory: "
					 default-directory))
		   default-directory)))
  (print dir))