updated readme, added :media-only? option

README.md

@@ -24,6 +24,9 @@ If you get a [permission failure](https://github.com/anmonteiro/lumo/issues/206)
 * create a Tumblr API key following the instructions [here](http://www.developerdrive.com/2014/05/how-to-get-started-with-the-tumblr-api-part-1/)
 * create a file called `config.edn` with the following contents:
 
+**NOTE**: the bot checks the specified Mastodon account to see the timestamp of the last post, and only posts content
+with later timestamps to avoid duplicate posts. On the first run the timestamp will default to current time.
+
 ```clojure
 {;; add Twitter config to mirror Twitter accounts
  :twitter {:access-keys
@@ -52,9 +55,12 @@ If you get a [permission failure](https://github.com/anmonteiro/lumo/issues/206)
  :mastodon {:access_token "XXXX"
             :api_url "https://botsin.space/api/v1/"
             ;; optional boolean to mark content as sensitive
-            :sensitive true
+            :sensitive? true
+            ;; optional boolean defaults to false
+            ;; only sources containing media will be posted when set to true
+            :media-only? true
             ;; optional visibility flag: direct, private, unlisted, public
-            ;; defaults to public
+            ;; defaults to public        
             :visibility "unlisted"
             ;; optional limit for the post length
             :max-post-length 300

mastodon-bot.cljs

@@ -95,11 +95,11 @@
   ([status-text]
    (post-status status-text nil))
   ([status-text media-ids]
-   (let [{:keys [sensitive signature visibility]} mastodon-config]
+   (let [{:keys [sensitive? signature visibility]} mastodon-config]
      (.post mastodon-client "statuses"
           (clj->js (merge {:status (-> status-text resolve-urls set-signature)}
                           (when media-ids {:media_ids media-ids})
-                          (when sensitive {:sensitive sensitive})
+                          (when sensitive? {:sensitive sensitive?})
                           (when visibility {:visibility visibility})))))))
 
 (defn post-image [image-stream description callback]
@@ -127,7 +127,8 @@
                                           (filter #(> (:created-at %) last-post-time)))]
     (if media-links
       (post-status-with-images text media-links)
-      (post-status text))))
+      (when-not (:media-only? mastodon-config)
+        (post-status text)))))
 
 (defn parse-tweet [{created-at            :created_at
                     text                  :full_text