feat: add full descriptions in a scrollable popup

src/youtube.rs

@@ -13,6 +13,9 @@ pub struct Video {
     pub id: String,
     pub title: String,
     pub channel: Option<String>,
+    // Search descriptions are truncated; only full video metadata populates this cache.
+    #[serde(skip)]
+    pub description: Option<String>,
 }
 
 #[derive(Deserialize)]
@@ -42,6 +45,22 @@ pub fn search_results(output: &str) -> Result<Vec<Video>, String> {
     Ok(videos)
 }
 
+pub fn full_description(output: &str, expected_id: &str) -> Result<String, String> {
+    #[derive(Deserialize)]
+    struct Details {
+        id: String,
+        description: Option<String>,
+    }
+    let details: Details =
+        serde_json::from_str(output).map_err(|error| format!("Invalid video metadata: {error}"))?;
+    if details.id != expected_id {
+        return Err("Video metadata did not match the requested video".into());
+    }
+    let mut description = details.description.unwrap_or_default();
+    description.retain(|c| !c.is_control() || c == '\n' || c == '\t');
+    Ok(description)
+}
+
 // Own the extractor so replacing a request or quitting also cancels its process.
 pub struct Job {
     child: Child,
@@ -50,9 +69,25 @@ pub struct Job {
 
 impl Job {
     pub fn search(query: &str) -> io::Result<Self> {
+        Self::spawn(&[
+            "--flat-playlist",
+            "--dump-single-json",
+            &format!("ytsearch20:{query}"),
+        ])
+    }
+
+    pub fn description(id: &str) -> io::Result<Self> {
+        Self::spawn(&[
+            "--no-playlist",
+            "--skip-download",
+            "--dump-single-json",
+            &format!("https://www.youtube.com/watch?v={id}"),
+        ])
+    }
+
+    fn spawn(args: &[&str]) -> io::Result<Self> {
         let mut child = extractor()
-            .args(["--flat-playlist", "--dump-single-json"])
-            .arg(format!("ytsearch20:{query}"))
+            .args(args)
             .stdin(Stdio::null())
             .stdout(Stdio::piped())
             .stderr(Stdio::piped())
@@ -265,4 +300,19 @@ mod tests {
         assert!(search_results(r#"{"entries":[{"id":"--bad","title":"Bad"}]}"#).is_err());
         assert!(search_results("not JSON").is_err());
     }
+
+    #[test]
+    fn full_descriptions_preserve_paragraphs_and_reject_mismatched_videos() {
+        let metadata = r#"{"id":"jNQXAC9IVRw","description":"First paragraph.\n\n日本語\tsecond paragraph.\u001b\nLast line."}"#;
+        assert_eq!(
+            full_description(metadata, "jNQXAC9IVRw").unwrap(),
+            "First paragraph.\n\n日本語\tsecond paragraph.\nLast line."
+        );
+        assert!(full_description(metadata, "rQ_J9WH6CGk").is_err());
+        assert!(full_description("not JSON", "jNQXAC9IVRw").is_err());
+        assert_eq!(
+            full_description(r#"{"id":"jNQXAC9IVRw","description":null}"#, "jNQXAC9IVRw").unwrap(),
+            ""
+        );
+    }
 }