refactor: minor nitpicks

src/args.rs

@@ -0,0 +1,33 @@
+use clap::Parser;
+
+#[derive(Debug, Parser)]
+#[command(version)]
+pub struct Args {
+    /// User Agent to use for requests
+    #[arg(
+        short,
+        default_value = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36"
+    )]
+    pub user_agent: String,
+
+    /// Tags to search for
+    #[arg(short, long, required = true)]
+    pub tags: Vec<String>,
+
+    /// Page to start scraping from
+    #[arg(short, long, default_value_t = 1)]
+    pub page: usize,
+
+    /// Async jobs to use for fetching
+    #[arg(short, long, default_value_t = 4)]
+    pub jobs: usize,
+
+    /// Delay for rate-limits (ms)
+    #[arg(short, long, default_value = "1000", value_parser = parse_duration)]
+    pub delay: std::time::Duration,
+}
+
+fn parse_duration(arg: &str) -> Result<std::time::Duration, std::num::ParseIntError> {
+    let seconds = arg.parse()?;
+    Ok(std::time::Duration::from_millis(seconds))
+}