now it checks for colisions

src/main.rs

@@ -1,5 +1,6 @@
 use std::{process::Command, io::{BufRead, Write}};
 use gelbooru_api::{Client, posts};
+use std::collections::HashSet;
 
 const LEGEND: &str = "[q]uit, [d]elete, [a]ccept";
 const PENDING: &str = "./pending.csv";
@@ -18,10 +19,18 @@ async fn main(){
 
 async fn fetch_mode(tags: Vec<String>) {
     let client = Client::public();
-    let posts = dbg!(posts()
-        .tags(&tags)
-        .send(&client)
-        .await.unwrap());
+    let posts = posts()
+    .random(true)
+    .tags(&tags)
+    .send(&client);
+
+    let image_set1 = std::fs::read(PENDING).expect("File not found").iter().map(|c| *c as char).collect::<String>();
+    let image_set2 = std::fs::read(VERIFIED).expect("File not found").iter().map(|c| *c as char).collect::<String>();
+    let image_set3 = std::fs::read(REJECTED).expect("File not found").iter().map(|c| *c as char).collect::<String>();
+
+    let image_set = image_set1.lines().chain(image_set2.lines()).chain(image_set3.lines()).collect::<HashSet<_>>();
+
+    let posts = posts.await.unwrap();
     let mut file = std::fs::OpenOptions::new()
     .write(true)
     .append(true) // This is needed to append to file
@@ -29,7 +38,10 @@ async fn fetch_mode(tags: Vec<String>) {
     .unwrap();
 
     for post in posts.posts {
-        write!(file, "{}\n", post.image_url()).unwrap();
+        let imgurl = post.image_url();
+        if !image_set.contains(imgurl){
+            write!(file, "{}\n", imgurl).unwrap();
+        }
     }
 }