Extract links from headers

main.janet

@@ -2,14 +2,27 @@
 (import spork/json :as json)
 
 (def url "https://hachyderm.io/api/v1/bookmarks")
-(def auth "REDACTED")
+(def auth "")
+
+(defn get-link [response rel]
+  "Gets the link with the specified relation from the response.
+   e.g. (get-link response \"next\")"
+  # Get the links from the headers
+  (def links (string/split "," ((response :headers) "Link")))
+  # Find the link with the specified relation
+  (def link (find |(not= (string/find rel $) nil) links))
+  # Extract the url from the link string (as an array of 1 element)
+  (def url (peg/match ~(sequence (any " ") "<" (capture (some (if-not ">" 1))) ">") link))
+  (if url (in url 0) nil))
 
 (defn download-bookmarks []
   "Downloads the bookmarks and saves them to a file."
   (def response
     (r/get url {"Authorization" (string "Bearer " auth)} {}))
-  (def links ((response :headers) "Link"))
+  (def next-link (get-link response "next"))
-  (pp links)
+  (def prev-link (get-link response "prev"))
+  (pp next-link)
+  (pp prev-link)
   (def bookmarks (json/decode (response :body)))
   (def fout (file/open "./response.json" :w))
   (file/write fout (json/encode bookmarks)))