refactor: make everything a little more modular

src/util.rs

@@ -0,0 +1,37 @@
+// std
+use std::error::Error;
+use crate::ScootalooError;
+
+// reqwest
+use reqwest::Url;
+
+// tokio
+use tokio::{
+    io::copy,
+    fs::{File, create_dir_all},
+};
+
+/// Gets and caches Twitter Media inside the determined temp dir
+pub async fn cache_media(u: &str, t: &str) -> Result<String, Box<dyn Error>> {
+    // create dir
+    create_dir_all(t).await?;
+
+    // get file
+    let mut response = reqwest::get(u).await?;
+
+    // create local file
+    let url = Url::parse(u)?;
+    let dest_filename = url.path_segments().ok_or_else(|| ScootalooError::new(&format!("Cannot determine the destination filename for {}", u)))?
+                    .last().ok_or_else(|| ScootalooError::new(&format!("Cannot determine the destination filename for {}", u)))?;
+
+    let dest_filepath = format!("{}/{}", t, dest_filename);
+
+    let mut dest_file = File::create(&dest_filepath).await?;
+
+    while let Some(chunk) = response.chunk().await? {
+        copy(&mut &*chunk, &mut dest_file).await?;
+    }
+
+    Ok(dest_filepath)
+}
+