Calvin and Hobbes with Emacs

I am a big fan of Calvin and Hobbes and wanted to see one comic strip every day when I started my emacs.
You have to install imagemagick to resize the comic strip before displaying.

;; Calvin and Hobbes modules
(defun kill-if-buffer-exists (bufname)
(when (get-buffer bufname)
(kill-buffer bufname)))

(defun get-calvin ()
"Fetch the most recent Calvin image and show it in the buffer."
(interactive)
(save-excursion
(let ((cmd "/usr/local/bin/wget -q -P /tmp/calvin http://calvinhobbesdaily.tumblr.com/rss > /dev/null 2>&1"))
(shell-command "rm -rf /tmp/calvin")
(kill-if-buffer-exists "rss")
(kill-if-buffer-exists "*calvin*")
(shell-command cmd)
(find-file "/tmp/calvin/rss")
(goto-char (point-min))
(when (search-forward-regexp "img src=\\\"\\\(.+?\\\)\\\"" (point-max) t 1)
(message "%s" (match-string 1))
(shell-command (format "/usr/local/bin/wget -q -P /tmp/calvin %s > /dev/null 2>&1" (match-string 1)))
(switch-to-buffer (get-buffer-create "*calvin*"))
(setq cmdStr (concat "/usr/local/bin/convert -scale 200% -quality 85% " (car (directory-files "/tmp/calvin" t "gif")) " " (file-name-sans-extension(car (directory-files "/tmp/calvin" t "gif"))) "-c.gif"))
(shell-command cmdStr)
(insert-image (create-image (car (directory-files "/tmp/calvin" t "gif"))))
(kill-if-buffer-exists "rss")
(kill-if-buffer-exists "*Shell Command Output*")))))