Extend +eshell/goto to allow finding files

Instead of only looking at directories, +eshell/goto now works with
files.  If a directory is selected, set eshell to that directory.  If
a file is selected, make eshell go to the directory where that file is
contained then use find-file.

Emacs/.config/emacs/elisp/eshell-additions.el

@@ -30,7 +30,11 @@
 ;; Aliases
 (defun eshell/goto (&rest args)
   "Use `read-directory-name' to change directories"
-  (eshell/cd (list (read-directory-name "Directory?: "))))
+  (let* ((name (read-file-name "Choose file: "))
+         (dir (file-name-directory name)))
+    (eshell/cd (list dir))
+    (if (not (file-directory-p name))
+        (find-file name))))
 
 (defun eshell/project-root (&rest args)
   "Change to directory `project-root'"