Add binary example to make playlist from a folder

Cargo.lock

@@ -28,9 +28,9 @@ dependencies = [
 
 [[package]]
 name = "anyhow"
-version = "1.0.44"
+version = "1.0.45"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "61604a8f862e1d5c3229fdd78f8b02c68dcf73a4c4b05fd636d12240aaa242c1"
+checksum = "ee10e43ae4a853c0a3591d4e2ada1719e553be18199d9da9d4a83f5927c2f5c7"
 
 [[package]]
 name = "atty"
@@ -79,12 +79,15 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 name = "bliss-audio"
 version = "0.4.1"
 dependencies = [
+ "anyhow",
  "bliss-audio-aubio-rs",
  "crossbeam",
  "env_logger",
  "ffmpeg-next",
+ "glob",
  "lazy_static 1.4.0",
  "log",
+ "mime_guess",
  "ndarray",
  "ndarray-npy",
  "ndarray-stats",
@@ -616,6 +619,22 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "mime"
+version = "0.3.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a60c7ce501c71e03a9c9c0d35b861413ae925bd979cc7a4e30d060069aaac8d"
+
+[[package]]
+name = "mime_guess"
+version = "2.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2684d4c2e97d99848d30b324b00c8fcc7e5c897b7cbb5819b09e7c90e8baf212"
+dependencies = [
+ "mime",
+ "unicase",
+]
+
 [[package]]
 name = "miniz_oxide"
 version = "0.4.4"
@@ -1177,6 +1196,15 @@ version = "0.1.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
 
+[[package]]
+name = "unicase"
+version = "2.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50f37be617794602aabbeee0be4f259dc1778fabe05e2d67ee8f79326d5cb4f6"
+dependencies = [
+ "version_check",
+]
+
 [[package]]
 name = "unicode-segmentation"
 version = "1.8.0"

Cargo.toml

@@ -44,3 +44,8 @@ bliss-audio-aubio-rs = "0.2.0"
 strum = "0.21"
 strum_macros = "0.21"
 serde = { version = "1.0", optional = true, features = ["derive"] }
+
+[dev-dependencies]
+mime_guess = "2.0.3"
+glob = "0.3.0"
+anyhow = "1.0.45"

examples/playlist.rs

@@ -0,0 +1,57 @@
+use anyhow::Result;
+use bliss_audio::distance::{closest_to_first_song, dedup_playlist, euclidean_distance};
+use bliss_audio::{library::analyze_paths_streaming, Song};
+use glob::glob;
+use mime_guess;
+use std::env;
+use std::fs;
+use std::path::Path;
+
+/* Analyzes a folder recursively, and make a playlist out of the file
+ * provided by the user. */
+// TODO still:
+// * Save the results somewhere to avoid analyzing stuff over and over
+// * Make the output file configurable
+// * Allow to choose between outputing to stdout and a file
+fn main() -> Result<()> {
+    let args: Vec<String> = env::args().skip(1).collect();
+    if args.len() > 3 || args.len() < 2 {
+        println!("Usage: ./playlist <folder> <file>");
+        println!(
+            "Creates a playlist of all audio files in a folder (recursively), \
+            starting with <file>, and outputs the result both to stdout and \
+            a `playlist.m3u` file in the current folder."
+        );
+        return Ok(());
+    }
+    let folder = &args[0];
+    let file = fs::canonicalize(&args[1])?;
+    let pattern = Path::new(folder).join("**").join("*");
+    let songs = glob(&pattern.to_string_lossy())?
+        .map(|e| fs::canonicalize(e.unwrap()).unwrap())
+        .filter(|e| match mime_guess::from_path(e).first() {
+            Some(m) => m.type_() == "audio",
+            None => false,
+        })
+        .map(|x| x.to_string_lossy().to_string())
+        .collect::<Vec<String>>();
+    let rx = analyze_paths_streaming(songs)?;
+    let first_song = Song::new(file)?;
+    let mut analyzed_songs = vec![first_song.to_owned()];
+    for (path, result) in rx.iter() {
+        match result {
+            Ok(song) => analyzed_songs.push(song),
+            Err(e) => println!("error analyzing {}: {}", path, e),
+        };
+    }
+    closest_to_first_song(&first_song, &mut analyzed_songs, euclidean_distance);
+    dedup_playlist(&mut analyzed_songs, None);
+    let playlist = analyzed_songs
+        .iter()
+        .map(|s| s.path.to_string_lossy().to_string())
+        .collect::<Vec<String>>()
+        .join("\n");
+    println!("{}", playlist);
+    fs::write("./playlist.m3u", playlist)?;
+    Ok(())
+}