chore: bump version (v1.3.1)

issue #2

.editorconfig

@@ -1,7 +1,7 @@
 root = true
 
 [*]
-indent_style = space
+indent_style = tab
 indent_size = 4
 charset = utf-8
 trim_trailing_whitespace = true

.rustfmt.toml

@@ -0,0 +1 @@
+hard_tabs = true

CHANGELOG.md

@@ -0,0 +1,28 @@
+# Changelog
+
+## v1.3.1
+
+* dependencies upgraded
+
+## v1.3.0
+
+* allow multiple values for the tags "musicbrainz-artistid" and "musicbrainz-albumartistid"
+* fix "from", "to" & "config" cli argument processing
+
+## v1.2.2
+
+* dependencies upgraded
+
+## v1.2.1
+
+* dependencies upgraded
+
+## v1.2.0
+
+* "copy" encoding format added
+* "jobs" cli argument added, that lets you set the number of concurrent transcodes
+
+## v1.1.0
+
+* "flac" encoding format added
+* resampling quality set to highest/"10"

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "audio-conv"
-version = "1.0.0"
+version = "1.3.1"
-edition = "2018"
+edition = "2021"
 description = "Copies directory structure and converts audio files in it"
 authors = ["Thomas Heck <t@b128.net>"]
 repository = "https://gitlab.com/chpio/audio-conv"
@@ -13,24 +13,30 @@ categories = [
     "multimedia::encoding",
 ]
 keywords = ["audio", "conversion", "opus", "flac"]
+include = [
+    "/src/**/*",
+    "/example.audio-conv.yaml",
+    "/README.md",
+    "/CHANGELOG.md",
+]
 
 [dependencies]
-gstreamer-audio = { version = "0.16", features = ["v1_10"] }
+gstreamer = { version = "0.23", features = ["v1_16"] }
-gstreamer = { version = "0.16", features = ["v1_10"] }
+gstreamer-base = { version = "0.23", features = ["v1_16"] }
-gstreamer-base = { version = "0.16", features = ["v1_10"] }
+gstreamer-audio = { version = "0.23", features = ["v1_16"] }
-glib = "0.10"
+glib = "0.20"
 futures = "0.3"
 num_cpus = "1"
 walkdir = "2"
 libc = "0.2"
 anyhow = "1"
-clap = "2"
+clap = { version = "4", features = ["cargo"] }
 serde = { version = "1.0", features = ["derive"] }
-serde_yaml = "0.8"
+serde_yaml = "0.9"
 regex = "1"
 globset = "0.4"
 derive_more = "0.99"
-tui = { version = "0.13", default-features = false, features = ["crossterm"] }
+tui = { version = "0.19", default-features = false, features = ["crossterm"] }
 
 [dependencies.tokio]
 version = "1"

README.md

@@ -0,0 +1,34 @@
+# audio-conv
+
+Takes two paths, all audio files encountered in the first path are transcoded and stored in the
+second path. The directory structure from the first path gets also copied to the second path.
+
+## Dependencies
+
+Requires *gstreamer* version 1.16 or higher with the *base* plugin.
+
+The supported source audio formats (or even other media that is able to contain audio) depend on
+the installed *gstreamer* plugins.
+
+## Installation via nix flakes
+
+*audio-conv* can be easily installed via *nix flakes*:
+
+```bash
+$ nix profile install gitlab:chpio/audio-conv/release
+```
+
+## Generate example config
+
+*audio-conv* is able to write an example config to your current directory:
+
+```bash
+$ audio-conv init
+```
+
+Now you need to edit the generated *audio-conv.yaml* file. And let it convert your audio files
+by running it:
+
+```bash
+$ audio-conv
+```

example.audio-conv.yaml

@@ -13,9 +13,19 @@ matches:
       bitrate: 160
       bitrate_type: vbr # or cbr
 
+    # for copy (copies file without transcoding it):
+    # to:
+    #   codec: copy
+
     # for mp3:
     # to:
     #   codec: mp3
     #   # one of: 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256 or 320
     #   bitrate: 256
     #   bitrate_type: vbr # or cbr
+
+    # for flac:
+    # to:
+    #   codec: flac
+    #   # effort spend for the compression. 0 (fastes compression) to 9 (highest compression)
+    #   compression: 8

flake.lock

@@ -1,58 +0,0 @@
-{
-  "nodes": {
-    "flake-utils": {
-      "locked": {
-        "lastModified": 1605370193,
-        "narHash": "sha256-YyMTf3URDL/otKdKgtoMChu4vfVL3vCMkRqpGifhUn0=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "5021eac20303a61fafe17224c087f5519baed54d",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
-    "import-cargo": {
-      "locked": {
-        "lastModified": 1594305518,
-        "narHash": "sha256-frtArgN42rSaEcEOYWg8sVPMUK+Zgch3c+wejcpX3DY=",
-        "owner": "edolstra",
-        "repo": "import-cargo",
-        "rev": "25d40be4a73d40a2572e0cc233b83253554f06c5",
-        "type": "github"
-      },
-      "original": {
-        "owner": "edolstra",
-        "repo": "import-cargo",
-        "type": "github"
-      }
-    },
-    "nixpkgs": {
-      "locked": {
-        "lastModified": 1608633860,
-        "narHash": "sha256-AGJfdJCR5jfIt8PqGiENXRqhthrS3Gxy8Wzb3Z2GsS4=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "da1b28ab8f361fbe14dc539cd69ce1bfd015fd68",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "flake-utils": "flake-utils",
-        "import-cargo": "import-cargo",
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}

flake.nix

@@ -1,63 +0,0 @@
-{
-    description = "Converts audio files";
-
-    inputs = {
-        nixpkgs.url = github:NixOS/nixpkgs;
-        flake-utils.url = "github:numtide/flake-utils";
-        import-cargo.url = github:edolstra/import-cargo;
-    };
-
-    outputs = { self, flake-utils, nixpkgs, import-cargo }:
-        flake-utils.lib.eachDefaultSystem (system:
-            let
-                pkgs = import nixpkgs { inherit system; };
-
-                buildtimeDeps = with pkgs; [
-                    cargo
-                    rustc
-                    pkg-config
-                ];
-
-                runtimeDeps = with pkgs; [
-                    gst_all_1.gstreamer
-
-                    # needed for opus, resample, ...
-                    gst_all_1.gst-plugins-base
-
-                    # needed for flac
-                    gst_all_1.gst-plugins-good
-                ];
-
-                inherit (import-cargo.builders) importCargo;
-            in {
-                defaultPackage = pkgs.stdenv.mkDerivation {
-                    name = "audio-conv";
-                    src = self;
-
-                    nativeBuildInputs = [
-                        # setupHook which makes sure that a CARGO_HOME with vendored dependencies
-                        # exists
-                        (importCargo { lockFile = ./Cargo.lock; inherit pkgs; }).cargoHome
-                    ]
-                        ++ buildtimeDeps;
-
-                    buildInputs = runtimeDeps;
-
-                    buildPhase = ''
-                        cargo build --release --offline
-                    '';
-
-                    installPhase = ''
-                        install -Dm775 ./target/release/audio-conv $out/bin/audio-conv
-                    '';
-                };
-
-                devShell = pkgs.stdenv.mkDerivation {
-                    name = "audio-conv";
-                    buildInputs = [ pkgs.rustfmt pkgs.rust-analyzer ]
-                        ++ buildtimeDeps
-                        ++ runtimeDeps;
-                };
-            }
-        );
-}

src/config.rs

@@ -1,278 +1,322 @@
 use anyhow::{Context, Error, Result};
+use clap::{builder::ValueParser, ArgAction};
 use globset::GlobBuilder;
 use regex::bytes::{Regex, RegexBuilder};
 use serde::Deserialize;
 use std::{
-    io::Write,
+	io::Write,
-    path::{Path, PathBuf},
+	path::{Path, PathBuf},
 };
 
 #[derive(Debug)]
 pub struct Config {
-    pub from: PathBuf,
+	pub from: PathBuf,
-    pub to: PathBuf,
+	pub to: PathBuf,
-    pub matches: Vec<TranscodeMatch>,
+	pub matches: Vec<TranscodeMatch>,
+	pub jobs: Option<usize>,
 }
 
 #[derive(Debug)]
 pub struct TranscodeMatch {
-    pub regexes: Vec<Regex>,
+	pub regexes: Vec<Regex>,
-    pub to: Transcode,
+	pub to: Transcode,
 }
 
 #[derive(Clone, Debug, Deserialize)]
 #[serde(tag = "codec")]
 pub enum Transcode {
-    #[serde(rename = "opus")]
+	#[serde(rename = "opus")]
-    Opus {
+	Opus {
-        #[serde(default = "default_opus_bitrate")]
+		#[serde(default = "default_opus_bitrate")]
-        bitrate: u16,
+		bitrate: u16,
 
-        #[serde(default = "bitrate_type_vbr")]
+		#[serde(default = "bitrate_type_vbr")]
-        bitrate_type: BitrateType,
+		bitrate_type: BitrateType,
-    },
+	},
 
-    #[serde(rename = "mp3")]
+	#[serde(rename = "flac")]
-    Mp3 {
+	Flac {
-        #[serde(default = "default_mp3_bitrate")]
+		#[serde(default = "default_flac_compression")]
-        bitrate: u16,
+		compression: u8,
+	},
 
-        #[serde(default = "bitrate_type_vbr")]
+	#[serde(rename = "mp3")]
-        bitrate_type: BitrateType,
+	Mp3 {
-    },
+		#[serde(default = "default_mp3_bitrate")]
+		bitrate: u16,
+
+		#[serde(default = "bitrate_type_vbr")]
+		bitrate_type: BitrateType,
+	},
+
+	#[serde(rename = "copy")]
+	Copy,
 }
 
 impl Transcode {
-    pub fn extension(&self) -> &'static str {
+	pub fn extension(&self) -> &'static str {
-        match self {
+		match self {
-            Transcode::Opus { .. } => "opus",
+			Transcode::Opus { .. } => "opus",
-            Transcode::Mp3 { .. } => "mp3",
+			Transcode::Flac { .. } => "flac",
-        }
+			Transcode::Mp3 { .. } => "mp3",
-    }
+			Transcode::Copy => "",
+		}
+	}
 }
 
 fn default_opus_bitrate() -> u16 {
-    160
+	160
+}
+
+fn default_flac_compression() -> u8 {
+	5
 }
 
 fn bitrate_type_vbr() -> BitrateType {
-    BitrateType::Vbr
+	BitrateType::Vbr
 }
 
 fn default_mp3_bitrate() -> u16 {
-    256
+	256
 }
 
 impl Default for Transcode {
-    fn default() -> Self {
+	fn default() -> Self {
-        Transcode::Opus {
+		Transcode::Opus {
-            bitrate: default_opus_bitrate(),
+			bitrate: default_opus_bitrate(),
-            bitrate_type: bitrate_type_vbr(),
+			bitrate_type: bitrate_type_vbr(),
-        }
+		}
-    }
+	}
 }
 
 #[derive(Clone, Debug, Deserialize)]
 pub enum BitrateType {
-    #[serde(rename = "cbr")]
+	#[serde(rename = "cbr")]
-    Cbr,
+	Cbr,
-    #[serde(rename = "vbr")]
+	#[serde(rename = "vbr")]
-    Vbr,
+	Vbr,
 }
 
 #[derive(Debug, Default, Deserialize)]
 struct ConfigFile {
-    from: Option<PathBuf>,
+	from: Option<PathBuf>,
-    to: Option<PathBuf>,
+	to: Option<PathBuf>,
 
-    #[serde(default)]
+	#[serde(default)]
-    matches: Vec<TranscodeMatchFile>,
+	matches: Vec<TranscodeMatchFile>,
+
+	jobs: Option<usize>,
 }
 
 #[derive(Debug, Deserialize)]
 struct TranscodeMatchFile {
-    glob: Option<String>,
+	glob: Option<String>,
-    regex: Option<String>,
+	regex: Option<String>,
 
-    #[serde(default)]
+	#[serde(default)]
-    extensions: Vec<String>,
+	extensions: Vec<String>,
 
-    to: Transcode,
+	to: Transcode,
 }
 
 pub fn config() -> Result<Config> {
-    use clap::{App, Arg, SubCommand};
+	use clap::{Arg, Command};
 
-    let arg_matches = App::new("audio-conv")
+	let arg_matches = Command::new("audio-conv")
-        .version(clap::crate_version!())
+		.version(clap::crate_version!())
-        .about("Converts audio files")
+		.about("Converts audio files")
-        .arg(
+		.arg(
-            Arg::with_name("config")
+			Arg::new("config")
-                .short("c")
+				.short('c')
-                .long("config")
+				.long("config")
-                .required(false)
+				.required(false)
-                .takes_value(true)
+				.value_parser(ValueParser::path_buf())
-                .help("path to an audio-conv config file, defaults to \"audio-conv.yaml\""),
+				.action(ArgAction::Set)
-        )
+				.help("Path to an audio-conv config file, defaults to \"audio-conv.yaml\""),
-        .arg(
+		)
-            Arg::with_name("from")
+		.arg(
-                .short("f")
+			Arg::new("from")
-                .long("from")
+				.short('f')
-                .required(false)
+				.long("from")
-                .takes_value(true)
+				.required(false)
-                .help("from directory path"),
+				.value_parser(ValueParser::path_buf())
-        )
+				.action(ArgAction::Set)
-        .arg(
+				.help("\"from\" directory path"),
-            Arg::with_name("to")
+		)
-                .short("t")
+		.arg(
-                .long("to")
+			Arg::new("to")
-                .required(false)
+				.short('t')
-                .takes_value(true)
+				.long("to")
-                .help("to directory path"),
+				.required(false)
-        )
+				.value_parser(ValueParser::path_buf())
-        .subcommand(SubCommand::with_name("init").about("writes an example config"))
+				.action(ArgAction::Set)
-        .get_matches();
+				.help("\"to\" directory path"),
+		)
+		.arg(
+			Arg::new("jobs")
+				.short('j')
+				.long("jobs")
+				.required(false)
+				.value_parser(clap::value_parser!(usize))
+				.action(ArgAction::Set)
+				.help("Allow N jobs/transcodes at once. Defaults to number of logical cores"),
+		)
+		.subcommand(Command::new("init").about("writes an example config"))
+		.get_matches();
 
-    let current_dir = std::env::current_dir().context("could not get current directory")?;
+	let current_dir = std::env::current_dir().context("Could not get current directory")?;
 
-    let config_path = arg_matches.value_of_os("config");
+	let config_path = arg_matches.get_one::<PathBuf>("config");
-    let force_load = config_path.is_some();
+	let enforce_config_load = config_path.is_some();
-    let config_path = config_path
+	let config_path = config_path
-        .map(AsRef::<Path>::as_ref)
+		.map(AsRef::<Path>::as_ref)
-        .unwrap_or_else(|| AsRef::<Path>::as_ref("audio-conv.yaml"));
+		.unwrap_or_else(|| AsRef::<Path>::as_ref("audio-conv.yaml"));
-    let config_path = current_dir.join(config_path);
+	let config_path = current_dir.join(config_path);
 
-    if let Some("init") = arg_matches.subcommand_name() {
+	if let Some("init") = arg_matches.subcommand_name() {
-        std::fs::OpenOptions::new()
+		std::fs::OpenOptions::new()
-            .write(true)
+			.write(true)
-            .create_new(true)
+			.create_new(true)
-            .open(&config_path)
+			.open(&config_path)
-            .and_then(|mut f| f.write_all(std::include_bytes!("../example.audio-conv.yaml")))
+			.and_then(|mut f| f.write_all(std::include_bytes!("../example.audio-conv.yaml")))
-            .with_context(|| format!("unable to write config file to {}", config_path.display()))?;
+			.with_context(|| format!("Unable to write config file to {}", config_path.display()))?;
 
-        std::process::exit(0);
+		std::process::exit(0);
-    }
+	}
 
-    let config_dir = config_path
+	let config_dir = config_path
-        .parent()
+		.parent()
-        .context("could not get parent directory of the config file")?;
+		.context("Could not get parent directory of the config file")?;
 
-    let config_file = load_config_file(&config_path)
+	let config_file = load_config_file(&config_path)
-        .with_context(|| format!("failed loading config file \"{}\"", config_path.display()))?;
+		.with_context(|| format!("Failed loading config file {}", config_path.display()))?;
 
-    if force_load && config_file.is_none() {
+	if enforce_config_load && config_file.is_none() {
-        return Err(Error::msg(format!(
+		return Err(Error::msg(format!(
-            "could not find config file \"{}\"",
+			"could not find config file \"{}\"",
-            config_path.display()
+			config_path.display()
-        )));
+		)));
-    }
+	}
 
-    let default_regex = RegexBuilder::new("\\.(flac|wav)$")
+	let default_regex = RegexBuilder::new("\\.(flac|wav)$")
-        .case_insensitive(true)
+		.case_insensitive(true)
-        .build()
+		.build()
-        .expect("failed compiling default match regex");
+		.expect("Failed compiling default match regex");
 
-    let transcode_matches = config_file
+	let transcode_matches = config_file
-        .as_ref()
+		.as_ref()
-        .map(|config_file| {
+		.map(|config_file| {
-            config_file
+			config_file
-                .matches
+				.matches
-                .iter()
+				.iter()
-                .map(|m| {
+				.map(|m| {
-                    let glob = m.glob.iter().map(|glob| {
+					let glob = m.glob.iter().map(|glob| {
-                        let glob = GlobBuilder::new(glob)
+						let glob = GlobBuilder::new(glob)
-                            .case_insensitive(true)
+							.case_insensitive(true)
-                            .build()
+							.build()
-                            .context("failed building glob")?;
+							.context("Failed building glob")?;
-                        let regex = Regex::new(glob.regex()).context("failed compiling regex")?;
+						let regex = Regex::new(glob.regex()).context("Failed compiling regex")?;
-                        Ok(regex)
+						Ok(regex)
-                    });
+					});
 
-                    let regex = m.regex.iter().map(|regex| {
+					let regex = m.regex.iter().map(|regex| {
-                        let regex = RegexBuilder::new(regex)
+						let regex = RegexBuilder::new(regex)
-                            .case_insensitive(true)
+							.case_insensitive(true)
-                            .build()
+							.build()
-                            .context("failed compiling regex")?;
+							.context("Failed compiling regex")?;
-                        Ok(regex)
+						Ok(regex)
-                    });
+					});
 
-                    let extensions = m.extensions.iter().map(|ext| {
+					let extensions = m.extensions.iter().map(|ext| {
-                        let mut ext = regex::escape(ext);
+						let mut ext = regex::escape(ext);
-                        ext.insert_str(0, &"\\.");
+						ext.insert_str(0, &"\\.");
-                        ext.push_str("$");
+						ext.push_str("$");
 
-                        let regex = RegexBuilder::new(&ext)
+						let regex = RegexBuilder::new(&ext)
-                            .case_insensitive(true)
+							.case_insensitive(true)
-                            .build()
+							.build()
-                            .context("failed compiling regex")?;
+							.context("Failed compiling regex")?;
-                        Ok(regex)
+						Ok(regex)
-                    });
+					});
 
-                    let mut regexes = glob
+					let mut regexes = glob
-                        .chain(regex)
+						.chain(regex)
-                        .chain(extensions)
+						.chain(extensions)
-                        .collect::<Result<Vec<_>>>()?;
+						.collect::<Result<Vec<_>>>()?;
 
-                    if regexes.is_empty() {
+					if regexes.is_empty() {
-                        regexes.push(default_regex.clone());
+						regexes.push(default_regex.clone());
-                    }
+					}
 
-                    Ok(TranscodeMatch {
+					Ok(TranscodeMatch {
-                        regexes,
+						regexes,
-                        to: m.to.clone(),
+						to: m.to.clone(),
-                    })
+					})
-                })
+				})
-                .collect::<Result<Vec<_>>>()
+				.collect::<Result<Vec<_>>>()
-        })
+		})
-        .transpose()?
+		.transpose()?
-        .filter(|matches| !matches.is_empty())
+		.filter(|matches| !matches.is_empty())
-        .unwrap_or_else(|| {
+		.unwrap_or_else(|| {
-            vec![TranscodeMatch {
+			vec![TranscodeMatch {
-                regexes: vec![default_regex],
+				regexes: vec![default_regex],
-                to: Transcode::default(),
+				to: Transcode::default(),
-            }]
+			}]
-        });
+		});
 
-    Ok(Config {
+	Ok(Config {
-        from: {
+		from: {
-            arg_matches
+			arg_matches
-                .value_of_os("from")
+				.get_one::<PathBuf>("from")
-                .map(|p| current_dir.join(p))
+				.map(|p| current_dir.join(p))
-                .or_else(|| {
+				.or_else(|| {
-                    config_file
+					config_file
-                        .as_ref()
+						.as_ref()
-                        .map(|c| c.from.as_ref())
+						.map(|c| c.from.as_ref())
-                        .flatten()
+						.flatten()
-                        .map(|p| config_dir.join(p))
+						.map(|p| config_dir.join(p))
-                })
+				})
-                .ok_or_else(|| Error::msg("\"from\" not configured"))?
+				.ok_or_else(|| Error::msg("\"from\" not configured"))?
-                .canonicalize()
+				.canonicalize()
-                .context("could not canonicalize \"from\" path")?
+				.context("Could not canonicalize \"from\" path")?
-        },
+		},
-        to: arg_matches
+		to: arg_matches
-            .value_of_os("to")
+			.get_one::<PathBuf>("to")
-            .map(|p| current_dir.join(p))
+			.map(|p| current_dir.join(p))
-            .or_else(|| {
+			.or_else(|| {
-                config_file
+				config_file
-                    .as_ref()
+					.as_ref()
-                    .map(|c| c.to.as_ref())
+					.map(|c| c.to.as_ref())
-                    .flatten()
+					.flatten()
-                    .map(|p| config_dir.join(p))
+					.map(|p| config_dir.join(p))
-            })
+			})
-            .ok_or_else(|| Error::msg("\"to\" not configured"))?
+			.ok_or_else(|| Error::msg("\"to\" not configured"))?
-            .canonicalize()
+			.canonicalize()
-            .context("could not canonicalize \"to\" path")?,
+			.context("Could not canonicalize \"to\" path")?,
-        matches: transcode_matches,
+		matches: transcode_matches,
-    })
+		jobs: arg_matches
+			.get_one("jobs")
+			.copied()
+			.or_else(|| config_file.as_ref().map(|c| c.jobs).flatten()),
+		// .map(|jobs_str| {
+		// 	jobs_str.parse().with_context(|| {
+		// 		format!(
+		// 			"Could not parse \"jobs\" argument \"{}\" to a number",
+		// 			&jobs_str
+		// 		)
+		// 	})
+		// })
+		// .transpose()?,
+	})
 }
 
 fn load_config_file(path: &Path) -> Result<Option<ConfigFile>> {
-    let mut file = match std::fs::File::open(path) {
+	let mut file = match std::fs::File::open(path) {
-        Ok(file) => file,
+		Ok(file) => file,
-        Err(err) if err.kind() == std::io::ErrorKind::NotFound => return Ok(None),
+		Err(err) if err.kind() == std::io::ErrorKind::NotFound => return Ok(None),
-        Err(err) => return Err(Error::new(err)),
+		Err(err) => return Err(Error::new(err)),
-    };
+	};
-    let config: ConfigFile =
+	let config: ConfigFile =
-        serde_yaml::from_reader(&mut file).context("could not parse config file")?;
+		serde_yaml::from_reader(&mut file).context("Could not parse config file")?;
-    Ok(Some(config))
+	Ok(Some(config))
 }

src/tag.rs

@@ -0,0 +1,39 @@
+use glib::{gstr, GStr, Value};
+use gstreamer::{
+	tags::{merge_strings_with_comma, CustomTag},
+	Tag, TagFlag,
+};
+
+pub struct MbArtistId;
+
+impl<'a> Tag<'a> for MbArtistId {
+	type TagType = &'a str;
+	const TAG_NAME: &'static GStr = gstr!("musicbrainz-artistid");
+}
+
+impl CustomTag<'_> for MbArtistId {
+	const FLAG: TagFlag = TagFlag::Meta;
+	const NICK: &'static GStr = gstr!("artist ID");
+	const DESCRIPTION: &'static GStr = gstr!("MusicBrainz artist ID");
+
+	fn merge_func(src: &Value) -> Value {
+		merge_strings_with_comma(src)
+	}
+}
+
+pub struct MbAlbumArtistId;
+
+impl<'a> Tag<'a> for MbAlbumArtistId {
+	type TagType = &'a str;
+	const TAG_NAME: &'static GStr = gstr!("musicbrainz-albumartistid");
+}
+
+impl CustomTag<'_> for MbAlbumArtistId {
+	const FLAG: TagFlag = TagFlag::Meta;
+	const NICK: &'static GStr = gstr!("album artist ID");
+	const DESCRIPTION: &'static GStr = gstr!("MusicBrainz album artist ID");
+
+	fn merge_func(src: &Value) -> Value {
+		merge_strings_with_comma(src)
+	}
+}

src/ui.rs

@@ -2,8 +2,8 @@ use crate::ConversionArgs;
 use anyhow::{Context, Result};
 use futures::Future;
 use std::{
-    borrow::Cow, cell::RefCell, collections::HashMap, io, mem, path::PathBuf, rc::Rc,
+	borrow::Cow, cell::RefCell, collections::HashMap, io, mem, path::PathBuf, rc::Rc,
-    time::Duration,
+	time::Duration,
 };
 use tokio::{task, time::interval};
 use tui::{backend::CrosstermBackend, Terminal};
@@ -12,272 +12,272 @@ pub const UPDATE_INTERVAL_MILLIS: u64 = 100;
 
 #[derive(Debug)]
 pub enum Msg {
-    Init { task_len: usize, log_path: PathBuf },
+	Init { task_len: usize, log_path: PathBuf },
-    Exit,
+	Exit,
-    TaskStart { id: usize, args: ConversionArgs },
+	TaskStart { id: usize, args: ConversionArgs },
-    TaskEnd { id: usize },
+	TaskEnd { id: usize },
-    TaskProgress { id: usize, ratio: f64 },
+	TaskProgress { id: usize, ratio: f64 },
-    TaskError { id: usize },
+	TaskError { id: usize },
 }
 
 #[derive(Debug, Clone)]
 pub struct MsgQueue {
-    inner: Rc<RefCell<Vec<Msg>>>,
+	inner: Rc<RefCell<Vec<Msg>>>,
 }
 
 impl MsgQueue {
-    fn new() -> MsgQueue {
+	fn new() -> MsgQueue {
-        MsgQueue {
+		MsgQueue {
-            inner: Rc::new(RefCell::new(Vec::new())),
+			inner: Rc::new(RefCell::new(Vec::new())),
-        }
+		}
-    }
+	}
 
-    pub fn push(&self, msg: Msg) {
+	pub fn push(&self, msg: Msg) {
-        self.inner.borrow_mut().push(msg);
+		self.inner.borrow_mut().push(msg);
-    }
+	}
 
-    fn swap_inner(&self, other: &mut Vec<Msg>) {
+	fn swap_inner(&self, other: &mut Vec<Msg>) {
-        let mut inner = self.inner.borrow_mut();
+		let mut inner = self.inner.borrow_mut();
-        mem::swap(&mut *inner, other)
+		mem::swap(&mut *inner, other)
-    }
+	}
 }
 
 struct State {
-    terminal: Terminal<CrosstermBackend<io::Stdout>>,
+	terminal: Terminal<CrosstermBackend<io::Stdout>>,
-    log_path: Option<PathBuf>,
+	log_path: Option<PathBuf>,
-    task_len: Option<usize>,
+	task_len: Option<usize>,
-    ended_tasks: usize,
+	ended_tasks: usize,
-    running_tasks: HashMap<usize, Task>,
+	running_tasks: HashMap<usize, Task>,
-    has_rendered: bool,
+	has_rendered: bool,
-    has_errored: bool,
+	has_errored: bool,
 }
 
 impl State {
-    fn new() -> Result<State> {
+	fn new() -> Result<State> {
-        let terminal = Terminal::new(CrosstermBackend::new(io::stdout()))
+		let terminal = Terminal::new(CrosstermBackend::new(io::stdout()))
-            .context("Unable to create ui terminal")?;
+			.context("Unable to create ui terminal")?;
 
-        Ok(State {
+		Ok(State {
-            terminal,
+			terminal,
-            log_path: None,
+			log_path: None,
-            task_len: None,
+			task_len: None,
-            ended_tasks: 0,
+			ended_tasks: 0,
-            running_tasks: HashMap::new(),
+			running_tasks: HashMap::new(),
-            has_rendered: false,
+			has_rendered: false,
-            has_errored: false,
+			has_errored: false,
-        })
+		})
-    }
+	}
 
-    fn process_msg(&mut self, msg: Msg) -> Result<bool> {
+	fn process_msg(&mut self, msg: Msg) -> Result<bool> {
-        match msg {
+		match msg {
-            Msg::Init { task_len, log_path } => {
+			Msg::Init { task_len, log_path } => {
-                self.task_len = Some(task_len);
+				self.task_len = Some(task_len);
-                self.log_path = Some(log_path);
+				self.log_path = Some(log_path);
-            }
+			}
-            Msg::Exit => return Ok(false),
+			Msg::Exit => return Ok(false),
-            Msg::TaskStart { id, args } => {
+			Msg::TaskStart { id, args } => {
-                self.running_tasks.insert(
+				self.running_tasks.insert(
-                    id,
+					id,
-                    Task {
+					Task {
-                        id,
+						id,
-                        ratio: None,
+						ratio: None,
-                        args,
+						args,
-                    },
+					},
-                );
+				);
-            }
+			}
-            Msg::TaskEnd { id } => {
+			Msg::TaskEnd { id } => {
-                self.running_tasks
+				self.running_tasks
-                    .remove(&id)
+					.remove(&id)
-                    .context("unable to remove finished task; could't find task")?;
+					.context("Unable to remove finished task; could't find task")?;
-                self.ended_tasks += 1;
+				self.ended_tasks += 1;
-            }
+			}
-            Msg::TaskProgress { id, ratio } => {
+			Msg::TaskProgress { id, ratio } => {
-                let mut task = self
+				let task = self
-                    .running_tasks
+					.running_tasks
-                    .get_mut(&id)
+					.get_mut(&id)
-                    .context("Unable to update task progress; could't find task")?;
+					.context("Unable to update task progress; could't find task")?;
-                task.ratio = Some(ratio);
+				task.ratio = Some(ratio);
-            }
+			}
-            Msg::TaskError { id } => {
+			Msg::TaskError { id } => {
-                // TODO
+				// TODO
-                self.running_tasks
+				self.running_tasks
-                    .remove(&id)
+					.remove(&id)
-                    .context("unable to remove errored task; could't find task")?;
+					.context("Unable to remove errored task; could't find task")?;
-                self.ended_tasks += 1;
+				self.ended_tasks += 1;
-                self.has_errored = true;
+				self.has_errored = true;
-            }
+			}
-        }
+		}
 
-        Ok(true)
+		Ok(true)
-    }
+	}
 
-    fn render(&mut self) -> Result<()> {
+	fn render(&mut self) -> Result<()> {
-        use tui::{
+		use tui::{
-            layout::{Constraint, Direction, Layout, Rect},
+			layout::{Constraint, Direction, Layout, Rect},
-            style::{Color, Modifier, Style},
+			style::{Color, Modifier, Style},
-            text::Text,
+			text::Text,
-            widgets::{Block, Borders, Gauge, Paragraph},
+			widgets::{Block, Borders, Gauge, Paragraph},
-        };
+		};
 
-        let task_len = if let Some(task_len) = self.task_len {
+		let task_len = if let Some(task_len) = self.task_len {
-            task_len
+			task_len
-        } else {
+		} else {
-            return Ok(());
+			return Ok(());
-        };
+		};
 
-        if task_len == 0 {
+		if task_len == 0 {
-            return Ok(());
+			return Ok(());
-        }
+		}
 
-        let tasks_ended = self.ended_tasks;
+		let tasks_ended = self.ended_tasks;
 
-        let mut running_tasks: Vec<_> = self.running_tasks.values().cloned().collect();
+		let mut running_tasks: Vec<_> = self.running_tasks.values().cloned().collect();
 
-        running_tasks.sort_by_key(|task| task.id);
+		running_tasks.sort_by_key(|task| task.id);
 
-        if !self.has_rendered {
+		if !self.has_rendered {
-            self.terminal.clear().context("cleaning ui failed")?;
+			self.terminal.clear().context("Clearing ui failed")?;
-            self.has_rendered = true;
+			self.has_rendered = true;
-        }
+		}
 
-        let error_text = match self.has_errored {
+		let error_text = match self.has_errored {
-            true => {
+			true => {
-                let text: Cow<'static, str> = self
+				let text: Cow<'static, str> = self
-                    .log_path
+					.log_path
-                    .as_ref()
+					.as_ref()
-                    .map(|lp| {
+					.map(|lp| {
-                        let text = format!("Error(s) occurred and were logged to {}", lp.display());
+						let text = format!("Error(s) occurred and were logged to {}", lp.display());
-                        Cow::Owned(text)
+						Cow::Owned(text)
-                    })
+					})
-                    .unwrap_or_else(|| Cow::Borrowed("Error(s) occurred"));
+					.unwrap_or_else(|| Cow::Borrowed("Error(s) occurred"));
-                Some(text)
+				Some(text)
-            }
+			}
-            false => None,
+			false => None,
-        };
+		};
 
-        self.terminal
+		self.terminal
-            .draw(|f| {
+			.draw(|f| {
-                let chunks = Layout::default()
+				let chunks = Layout::default()
-                    .direction(Direction::Vertical)
+					.direction(Direction::Vertical)
-                    .margin(1)
+					.margin(1)
-                    .constraints([Constraint::Percentage(90), Constraint::Percentage(10)].as_ref())
+					.constraints([Constraint::Percentage(90), Constraint::Percentage(10)].as_ref())
-                    .split(f.size());
+					.split(f.size());
 
-                let mut task_rect = chunks[0];
+				let mut task_rect = chunks[0];
 
-                if error_text.is_some() {
+				if error_text.is_some() {
-                    task_rect.height -= 3;
+					task_rect.height -= 3;
-                }
+				}
 
-                for (row, task) in running_tasks
+				for (row, task) in running_tasks
-                    .into_iter()
+					.into_iter()
-                    .take(task_rect.height as usize / 2)
+					.take(task_rect.height as usize / 2)
-                    .enumerate()
+					.enumerate()
-                {
+				{
-                    f.render_widget(
+					f.render_widget(
-                        Gauge::default()
+						Gauge::default()
-                            .label(task.args.rel_from_path.to_string_lossy().as_ref())
+							.label(task.args.rel_from_path.to_string_lossy().as_ref())
-                            .gauge_style(
+							.gauge_style(
-                                Style::default()
+								Style::default()
-                                    .fg(Color::White)
+									.fg(Color::White)
-                                    .bg(Color::Black)
+									.bg(Color::Black)
-                                    .add_modifier(Modifier::ITALIC),
+									.add_modifier(Modifier::ITALIC),
-                            )
+							)
-                            .ratio(task.ratio.unwrap_or(0.0)),
+							.ratio(task.ratio.unwrap_or(0.0)),
-                        Rect::new(
+						Rect::new(
-                            task_rect.x,
+							task_rect.x,
-                            task_rect.y + row as u16 * 2,
+							task_rect.y + row as u16 * 2,
-                            task_rect.width,
+							task_rect.width,
-                            1,
+							1,
-                        ),
+						),
-                    );
+					);
-                }
+				}
 
-                if let Some(error_text) = error_text {
+				if let Some(error_text) = error_text {
-                    f.render_widget(
+					f.render_widget(
-                        Paragraph::new(Text::raw(error_text)).style(
+						Paragraph::new(Text::raw(error_text)).style(
-                            Style::default()
+							Style::default()
-                                .fg(Color::Red)
+								.fg(Color::Red)
-                                .bg(Color::Black)
+								.bg(Color::Black)
-                                .add_modifier(Modifier::BOLD),
+								.add_modifier(Modifier::BOLD),
-                        ),
+						),
-                        Rect::new(task_rect.x, task_rect.height + 1, task_rect.width, 2),
+						Rect::new(task_rect.x, task_rect.height + 1, task_rect.width, 2),
-                    );
+					);
-                }
+				}
 
-                f.render_widget(
+				f.render_widget(
-                    Gauge::default()
+					Gauge::default()
-                        .block(
+						.block(
-                            Block::default()
+							Block::default()
-                                .borders(Borders::ALL)
+								.borders(Borders::ALL)
-                                .title("Overall Progress"),
+								.title("Overall Progress"),
-                        )
+						)
-                        .gauge_style(
+						.gauge_style(
-                            Style::default()
+							Style::default()
-                                .fg(Color::White)
+								.fg(Color::White)
-                                .bg(Color::Black)
+								.bg(Color::Black)
-                                .add_modifier(Modifier::ITALIC),
+								.add_modifier(Modifier::ITALIC),
-                        )
+						)
-                        .ratio(tasks_ended as f64 / task_len as f64),
+						.ratio(tasks_ended as f64 / task_len as f64),
-                    chunks[1],
+					chunks[1],
-                );
+				);
-            })
+			})
-            .context("rendering ui failed")?;
+			.context("Rendering ui failed")?;
 
-        Ok(())
+		Ok(())
-    }
+	}
 }
 
 #[derive(Debug, Clone)]
 struct Task {
-    id: usize,
+	id: usize,
-    ratio: Option<f64>,
+	ratio: Option<f64>,
-    args: ConversionArgs,
+	args: ConversionArgs,
 }
 
 pub fn init() -> (MsgQueue, impl Future<Output = Result<()>>) {
-    let queue = MsgQueue::new();
+	let queue = MsgQueue::new();
 
-    let queue_clone = queue.clone();
+	let queue_clone = queue.clone();
-    let fut = async move {
+	let fut = async move {
-        let mut interval = interval(Duration::from_millis(UPDATE_INTERVAL_MILLIS));
+		let mut interval = interval(Duration::from_millis(UPDATE_INTERVAL_MILLIS));
-        let mut wrapped = Some((Vec::new(), State::new()?));
+		let mut wrapped = Some((Vec::new(), State::new()?));
 
-        loop {
+		loop {
-            interval.tick().await;
+			interval.tick().await;
 
-            let (mut current_queue, mut state) = wrapped.take().context("`wrapped` is None")?;
+			let (mut current_queue, mut state) = wrapped.take().context("`wrapped` is None")?;
 
-            queue_clone.swap_inner(&mut current_queue);
+			queue_clone.swap_inner(&mut current_queue);
 
-            let render_res = task::spawn_blocking(move || -> Result<_> {
+			let render_res = task::spawn_blocking(move || -> Result<_> {
-                let mut exit = false;
+				let mut exit = false;
-                for msg in current_queue.drain(..) {
+				for msg in current_queue.drain(..) {
-                    if !state.process_msg(msg)? {
+					if !state.process_msg(msg)? {
-                        exit = true;
+						exit = true;
-                    }
+					}
-                }
+				}
 
-                state.render()?;
+				state.render()?;
 
-                if exit {
+				if exit {
-                    Ok(None)
+					Ok(None)
-                } else {
+				} else {
-                    Ok(Some((current_queue, state)))
+					Ok(Some((current_queue, state)))
-                }
+				}
-            })
+			})
-            .await
+			.await
-            .context("ui update task failed")?
+			.context("Ui update task failed")?
-            .context("ui update failed")?;
+			.context("Ui update failed")?;
 
-            match render_res {
+			match render_res {
-                Some(s) => wrapped = Some(s),
+				Some(s) => wrapped = Some(s),
-                None => break,
+				None => break,
-            }
+			}
-        }
+		}
 
-        Result::<_>::Ok(())
+		Result::<_>::Ok(())
-    };
+	};
 
-    (queue, fut)
+	(queue, fut)
 }