commit 3818e91ef871739f01e68357ca82f66dc65f3573
Author: Antoine Martin <antoine@alarsyo.net>
Date:   Mon Jun 17 23:09:26 2024 +0200

    Initial commit

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..bca2760
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "spotify-bpm-filter"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+rspotify = { version = "0.13", features = ["cli"] }
+tokio = { version = "1.38", features = ["full"] }
+
+futures = "*"
+futures-util = "*"
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..5894125
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,61 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1718208800,
+        "narHash": "sha256-US1tAChvPxT52RV8GksWZS415tTS7PV42KTc2PNDBmc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "cc54fb41d13736e92229c21627ea4f22199fee6b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-24.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..4f7dc69
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,29 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            cargo
+            clippy
+            rustPackages.clippy
+            rustc
+            rustfmt
+            rust-analyzer
+
+            openssl
+            pkg-config
+          ];
+
+          RUST_SRC_PATH = pkgs.rustPlatform.rustLibSrc;
+        };
+      });
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..7a88c95
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,92 @@
+use futures::stream::TryStreamExt;
+use futures_util::pin_mut;
+use rspotify::{prelude::*, scopes, AuthCodeSpotify, Credentials, OAuth};
+
+const SPOTIFY_WEB_API_ADD_PLAYLIST_MAX_ID_NUM: usize = 100;
+const SPOTIFY_WEB_API_TRACK_FEATURES_MAX_ID_NUM: usize = 100;
+
+#[tokio::main]
+async fn main() {
+    let args: Vec<String> = std::env::args().collect();
+    if args.len() != 4 {
+        eprintln!("usage: {} PLAYLIST_TITLE MIN_TEMPO MAX_TEMPO", args[0]);
+        std::process::exit(1);
+    }
+
+    let playlist_title = &args[1];
+    let min_tempo = args[2].parse::<u64>().unwrap();
+    let max_tempo = args[3].parse::<u64>().unwrap();
+    let tempo_range = min_tempo..=max_tempo;
+
+    // export RSPOTIFY_CLIENT_ID="your client_id"
+    // export RSPOTIFY_CLIENT_SECRET="secret"
+    //
+    // See https://developer.spotify.com/documentation/web-api/tutorials/getting-started#create-an-app
+    let creds = Credentials::from_env().unwrap();
+    let oauth = OAuth {
+        redirect_uri: "http://localhost:8888/callback".to_string(),
+        scopes: scopes!("playlist-modify-private", "user-library-read"),
+        ..Default::default()
+    };
+
+    let spotify = AuthCodeSpotify::new(creds, oauth);
+
+    // Obtaining the access token
+    let url = spotify.get_authorize_url(false).unwrap();
+    // This function requires the `cli` feature enabled.
+    spotify.prompt_for_token(&url).await.unwrap();
+
+    let user = spotify.current_user().await.unwrap();
+
+    eprintln!("Collecting saved tracks...");
+    let stream = spotify.current_user_saved_tracks(None);
+    pin_mut!(stream);
+    let mut track_ids = Vec::new();
+    while let Some(saved_track) = stream.try_next().await.unwrap() {
+        track_ids.push(saved_track.track.id.unwrap());
+    }
+
+    eprintln!("Fetching track features...");
+    let mut features = Vec::new();
+    for chunk in track_ids.chunks(SPOTIFY_WEB_API_TRACK_FEATURES_MAX_ID_NUM) {
+        // FIXME: why does rspotify return a Result<Option<Vec<Features>>>? I think this should be a
+        // Result<Vec<Option<Features>>>, the Spotify API returns `null` for a single track if the
+        // provided Id isn't valid
+        if let Ok(Some(mut features_chunk)) = spotify.tracks_features(chunk.iter().cloned()).await {
+            features.append(&mut features_chunk);
+        }
+    }
+
+    // if this fails then Spotify probably did not return some track's features, we can't rely on
+    // features and ids having the same index anymore!
+    assert_eq!(track_ids.len(), features.len());
+
+    let mut ids: Vec<PlayableId<'_>> = track_ids
+        .into_iter()
+        .zip(features.iter())
+        .filter(|(_, features)| {
+            let tempo = features.tempo.round() as u64;
+            let doubled_tempo = tempo * 2;
+            tempo_range.contains(&tempo) || tempo_range.contains(&doubled_tempo)
+        })
+        .map(|(id, _)| PlayableId::from(id))
+        .collect();
+
+    eprintln!("Creating playlist...");
+    let new_playlist = spotify
+        .user_playlist_create(user.id, playlist_title, Some(false), None, None)
+        .await
+        .unwrap();
+
+    while !ids.is_empty() {
+        // NOTE: Can't use ids.chunks() because PlayableId isn't Clone :(
+        //
+        // (chunks doesn't need Clone but playlist_add_items needs IntoIterator<Item = PlayableId>)
+        let ids_chunk = ids.drain(0..(SPOTIFY_WEB_API_ADD_PLAYLIST_MAX_ID_NUM.min(ids.len())));
+
+        spotify
+            .playlist_add_items(new_playlist.id.clone(), ids_chunk, None)
+            .await
+            .unwrap();
+    }
+}