refactor: build better decode functions

src/mastodon.rs

@@ -20,27 +20,18 @@ use elefren::{
 /// Decodes the Twitter mention to something that will make sense once Twitter has joined the
 /// Fediverse
 fn twitter_mentions(ums: &Vec<MentionEntity>) -> HashMap<String, String> {
-    let mut decoded_mentions = HashMap::new();
-
-    for um in ums {
-        decoded_mentions.insert(format!("@{}", um.screen_name), format!("@{}@twitter.com", um.screen_name));
-    }
-
-    decoded_mentions
+    ums.iter().map(|s|
+        (format!("@{}", s.screen_name), format!("@{}@twitter.com", s.screen_name))
+    ).collect()
 }
 
 /// Decodes urls from UrlEntities
 fn decode_urls(urls: &Vec<UrlEntity>) -> HashMap<String, String> {
-    let mut decoded_urls = HashMap::new();
-
-    for url in urls {
-        if url.expanded_url.is_some() {
-            // unwrap is safe here as we just verified that there is something inside expanded_url
-            decoded_urls.insert(String::from(&url.url), String::from(url.expanded_url.as_deref().unwrap()));
-        }
-    }
-
-    decoded_urls
+    urls.iter()
+        .filter(|s| s.expanded_url.is_some())
+        .map(|s|
+            (String::from(&s.url), String::from(s.expanded_url.as_deref().unwrap()))
+        ).collect()
 }
 
 /// Gets Mastodon Data
@@ -61,13 +52,11 @@ pub fn build_basic_status(tweet: &Tweet) -> Result<String, Box<dyn Error>> {
     let mut toot = String::from(&tweet.text);
 
     let decoded_urls = decode_urls(&tweet.entities.urls);
-
     for decoded_url in decoded_urls {
         toot = toot.replace(&decoded_url.0, &decoded_url.1);
     }
 
     let decoded_mentions = twitter_mentions(&tweet.entities.user_mentions);
-
     for decoded_mention in decoded_mentions {
         toot = toot.replace(&decoded_mention.0, &decoded_mention.1);
     }