;;; funcs.el --- functions for my own usage

(defun fc/load-time ()
  "How long did it take to load the configuration."
  (message "Emacs init time %s" (emacs-init-time)))

(defun fc/system-info ()
  "Display system informations"
  (format
   (concat "### System information :\n"
           "- OS: %s\n"
           "- Emacs: %s")
   system-type
   emacs-version))

;; font manipulation
(defun fc/scale-up-or-down-font-size (direction)
  "Scale the font. If DIRECTION is positive or zero the font is scaled up,
otherwise it is scaled down."
  (interactive)
  (let ((scale 0.5))
    (if (eq direction 0)
        (text-scale-set 0)
      (if (< direction 0)
          (text-scale-decrease scale)
        (text-scale-increase scale)))))

(defun fc/scale-up-font ()
  "Scale up the font."
  (interactive)
  (fc/scale-up-or-down-font-size 1))

(defun fc/scale-down-font ()
  "Scale up the font."
  (interactive)
  (fc/scale-up-or-down-font-size -1))

(defun fc/reset-font-size ()
  "Reset the font size."
  (interactive)
  (fc/scale-up-or-down-font-size 0))

;; jump to the scratch buffer
(defun fc/switch-to-scratch ()
  "Switch to scratch, grab the region if it's active."
  (interactive)
  (let ((contents
         (and (region-active-p)
              (buffer-substring (region-beginning)
                                (region-end)))))
    (switch-to-buffer "*scratch*")
    (if contents
        (progn
          (goto-char (buffer-end 1))
          (insert contents)))))

(global-set-key (kbd "s-N") 'fc/switch-to-scratch)

;; rename a buffer
(defun fc/rename-this-buffer-and-file ()
  "Renames current buffer and file it is visiting."
  (interactive)
  (let ((name (buffer-name))
        (filename (buffer-file-name))
        (read-file-name-function 'read-file-name-default))
    (if (not (and filename (file-exists-p filename)))
        (error "Buffer '%s' is not visiting a file!" name)
      (let ((new-name (read-file-name "New name: " filename)))
        (cond ((get-buffer new-name)
               (error "A buffer named '%s' already exists!" new-name))
              (t
               (rename-file filename new-name 1)
               (rename-buffer new-name)
               (set-visited-file-name new-name)
               (set-buffer-modified-p nil)
               (message "File '%s' successfully renamed to '%s'" name (file-name-nondirectory new-name))))))))

;; create temporary files
(defun fc/start--file (path)
  "Create a file at PATH, creating any containing directories as necessary.
Visit the file after creation."
  (make-directory (file-name-directory path) t)
  (find-file path))

(defun fc/start-tmp-file (file-name)
  "Create a file in /tmp for the given file name."
  (interactive "sName of temporary file: ")
  (fc/start--file (expand-file-name (format "/tmp/%s" file-name))))

(defun fc/start-nest-tmp-file (file-name)
  "Create a file in ~/tmp on nest for the give file name."
  (interactive "sName of the temporary file: ")
  (fc/start--file (expand-file-name (format "/nest.smfc.twitter.com:~/tmp/%s" file-name))))

;; open dired buffer with tramp on remote host
(defun fc/remote--dired (host)
  "Open dired on a remote host."
  (dired (concat "/" host ":")))

(defun fc/remote-nest-dired ()
  "Open dired on nest."
  (interactive)
  (fc/remote--dired "nest.smfc.twitter.com"))

;; un/monitor hosts by running mth remotely
(defun fc/silence-host (host)
  (interactive "sHostname: ")
  (let ((default-directory "/ssh:nest.smfc.twitter.com:"))
    (start-file-process "mth" (get-buffer-create "*mth*")
                        "/usr/local/bin/mth" "silence" host "99 years")))

(defun fc/unsilence-host (host)
  (interactive "sHostname: ")
  (let ((default-directory "/ssh:nest.smfc.twitter.com:"))
    (start-file-process "mth" (get-buffer-create "*mth*")
                        "/usr/local/bin/mth" "unsilence" host)))

(provide 'funcs)