closures are hard

src-lib/src/video.rs

@@ -3,18 +3,45 @@ use core::cmp::Ordering;
 use std::fs;
 use std::path::Path;
 
+pub fn screenshotify(input: &String) -> Result<Vec<String>, String> {
+   let output_d = format!("{}.d", input);
+   let ext = "jpg".to_string();
+   let mut result = vec![];
+   let _ = ify(input, |content_span| {
+      let output = format!("{}/{}.{}", output_d, result.len(), ext);
+      let _ = screenshot(&output, input, (content_span.stop + content_span.start) / 2.0)?;
+      result.push(output);
+      Ok(())
+   })?;
+   Ok(result)
+}
+
 pub fn clipify(input: &String) -> Result<Vec<String>, String> {
+   let output_d = format!("{}.d", input);
+   let ext = input.split(".").last().unwrap();
+   let mut result = vec![];
+   let _ = ify(input, |content_span| {
+      let output = format!("{}/{}.{}", output_d, result.len(), ext);
+      let _ = clip(&output, input, content_span)?;
+      result.push(output);
+      Ok(())
+   })?;
+   Ok(result)
+}
+
+fn ify(input: &String, mut cb: impl FnMut(ContentSpan) -> Result<(), String>) -> Result<(), String> {
    match inspect(input) {
       Ok(inspection) => {
-         let output_d = format!("{}.d", input);
-         let ext = input.split(".").last().unwrap();
-         let mut result = vec![];
-         for i in 0..inspection.len() {
-            let output = format!("{}/{}.{}", output_d, i, ext);
-            let _ = clip(&output, input, inspection[i])?;
-            result.push(output);
+         match inspection.iter()
+            .map(|x| cb(*x))
+            .filter(|x| x.is_err())
+            .map(|x| x.err())
+            .filter(|x| x.is_some())
+            .map(|x| x.unwrap())
+            .nth(0) {
+            Some(err) => Err(format!("callback failed: {}", err)),
+            None => Ok(()),
          }
-         Ok(result)
       },
       Err(msg) => Err(msg),
    }
@@ -224,6 +251,14 @@ mod test_inspection {
    use super::*;
    const FILE: &str = "/Users/breel/Movies/bel_1_1.mp4";
 
+   #[test]
+   fn test_screenshotify() {
+      let result = screenshotify(&FILE.to_string()).unwrap();
+      for i in result.iter() {
+         eprintln!("{}", i);
+      }
+   }
+
    #[test]
    fn test_clipify() {
       let result = clipify(&FILE.to_string()).unwrap();