diff --git a/site-lisp/phabricator.el b/site-lisp/phabricator.el
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+;;; phabricator.el --- utils for jumping/navigating to phabricator
+
+(require 'tbgX) ;; fb-find-repo-root
+(require 'dired)
+
+;;;###autoload
+
+;; You need to ssh to your devbox with tunneling so that your ssh
+;; session can run commands on your local machine i.e.:
+;;     `ssh -R12345:localhost:22 {your sandbox}`
+(defvar phabricator-ssh-port "12345"
+  "default ssh port for calling into 'open' with the uri")
+
+(defvar phabricator-diffusion-repo-alist
+  '(("admin"            . "E/browse/admin/")
+    ("dataswarm-hg"     . "E/browse/projects/data/dataswarm/")
+    ("dataswarm-git"    . "E/browse/projects/data/dataswarm/")
+    ("www"              . "E/browse/tfb/trunk/www/")
+    ("www-git"          . "E/browse/tfb/trunk/www/")
+    ("www-hg"           . "E/browse/tfb/trunk/www/")
+    ("configerator"     . "CF/browse/master/")
+    ("configerator-hg"  . "CF/browse/master/")
+    ("configerator-dsi" . "CFDSI/browse/master/")
+    ("fbcode"           . "FBCODE/browse/master/")
+    ("fbobjc"           . "FBOBJC/browse/master/")
+    ("fbsource"         . "FBS/browse/master/")
+    ("opsfiles"         . "O/browse/opsfiles/branches/PROD/")
+    ("opsfiles-git"     . "O/browse/opsfiles/branches/PROD/")
+    ("fbandroid"        . "FA/browse/master/")
+    ("si_sigma"         . "SIGMA/browse/master/"))
+  "repo-alist for determining the appropriate path to phabricator")
+
+(defun phabricator-diffusion-url (beg end)
+  "Retrieves the corresponding diffusion (browse) URL for the current file,
+   prints it in the minibuffer (via message), and puts the URL on the
+   clipboard."
+  (interactive (if (use-region-p)
+                   (list (region-beginning) (region-end))
+                 (list nil nil)))
+  (flet ((line-num (pt)
+                   (save-excursion
+                     (goto-char pt)
+                     (beginning-of-line)
+                     (number-to-string (1+ (count-lines 1 (point)))))))
+    (let* ((file-name (file-truename
+                       (or (buffer-file-name) (dired-file-name-at-point))))
+           (repo-path (directory-file-name (fb-find-repo-root file-name)))
+           (repo-name (file-name-nondirectory repo-path))
+           (rel-path (substring file-name (1+ (length repo-path))))
+           (diffusion-prefix "https://phabricator.fb.com/diffusion/")
+           (lines (if beg (concat "$" (line-num beg) "-" (line-num end)) ""))
+           (url (concat (concat diffusion-prefix
+                                (cdr (assoc repo-name phabricator-diffusion-repo-alist))
+                                rel-path lines))))
+      (with-temp-buffer
+        (message url)
+        (insert url)
+        (clipboard-kill-ring-save (point-min) (point-max))))))
+
+(provide 'phabricator)
+;;; phabricator.el ends here