Make sure that ‘tekuti-host’ doesn't end in a ‘/’

Tekuti gets real confused when a request is sent to
https://tekuti.example.com//admin/new-post claiming that the host field is
missing. From my logs:

    Throw to key `uri-error' with args `("Expected path not starting with
    \"//\" (no host): ~a" ("//admin/new-post"))'.

1 files changed, 6 insertions, 2 deletions

diff --git a/tekuti.el b/tekuti.el
index bbd4e56..c859396 100644
--- a/tekuti.el
+++ b/tekuti.el
@@ -43,7 +43,11 @@
 
 (require 'org)
 
-(defvar tekuti-host "http://127.0.0.1:8080")
+(defvar tekuti-host "http://127.0.0.1:8080"
+  "The host where tekuti is running.
+This should be the base URL of your blog. Where adding ‘/admin’
+will get you into the admin area of your blog. This shouldn't end
+with a ‘/’.")
 
 (defun tekuti--format-date (&optional date)
   "Format DATE into a date that tekuti understands."
@@ -136,7 +140,7 @@
          (url-request-data (tekuti-form-encode-data data))
          (previous-update-url (tekuti--get-update-url))
          (updatep (not (null previous-update-url))))
-    (url-retrieve (format "%s%s" tekuti-host
+    (url-retrieve (format "%s%s" (string-trim-right tekuti-host "/")
                           (or previous-update-url
                               "/admin/new-post"))
                   #'tekuti--send-finished