Use elisp to replace the hassle of having to manually update

`pdf-info-epdfinfo-program' variable after each update of `pdf-tools'
package before calling the `pdf-tools-install' function to rebuild the
`epdfinfo' binary

setup-files/setup-pdf.el

@@ -1,4 +1,4 @@
-;; Time-stamp: <2015-02-06 15:41:50 kmodi>
+;; Time-stamp: <2015-02-06 18:50:53 kmodi>
 
 ;; PDF
 
@@ -15,7 +15,41 @@
 (req-package pdf-tools
   :config
   (progn
-    (pdf-tools-install)))
+
+    (defun my/get-latest-pdf-tools-dir ()
+      "Get the full directory path of the latest installed version of
+pdf-tools package."
+      (interactive)
+      ;; Get a list of directories and files in `package-user-dir'
+      (let ((my/package-dirs (directory-files package-user-dir)))
+        ;; `break' implementation in elisp
+        ;; http://ergoemacs.org/emacs/elisp_break_loop.html
+        (catch 'break
+          (dotimes (index (safe-length my/package-dirs))
+            (let ((dir-name (pop my/package-dirs))
+                  full-dir-name)
+              ;; (message "%s" dir-name) ; debug
+              ;; Find a directory name that matches "pdf-tools-*"
+              (when (string-match "pdf\\-tools\\-.*" dir-name)
+                (setq full-dir-name (concat package-user-dir "/" dir-name))
+                ;; To ensure that the directory is valid, ensure that it
+                ;; contains "pdf-tools.el"
+                (when (locate-file "pdf-tools.el" (list full-dir-name))
+                  ;; break the `dotimes' loop on finding this directory
+                  ;; and return its full path
+                  (throw 'break full-dir-name))))))))
+
+    (defun my/pdf-tools-install ()
+      (interactive)
+      ;; Update the `pdf-info-epdfinfo-program' variable to point to
+      ;; the directory containing the latest version of `pdf-tools'
+      (setq pdf-info-epdfinfo-program
+            (concat (my/get-latest-pdf-tools-dir) "/epdfinfo"))
+      ;; Call the original `pdf-tools-install' function after updating the
+      ;; `pdf-info-epdfinfo-program' variable
+      (pdf-tools-install))
+
+    (my/pdf-tools-install)))
 
 
 (provide 'setup-pdf)