Start building a music player server (#17)

The very beginnings, with a very basic application architecture, for a music playing server on a headless system.

This also adds my new Flow library, which I'll be wanting to use in a variety of places.

Co-authored-by: Savanni D'Gerinel <savanni@luminescent-dreams.com>
Reviewed-on: savanni/tools#17

.gitignore

@@ -1,2 +1,4 @@
 target
 .direnv/
+node_modules
+dist

changeset/Cargo.toml

@@ -2,6 +2,8 @@
 name = "changeset"
 version = "0.1.0"
 edition = "2021"
+license = "GPL-3.0-only"
+license-file = "../COPYING"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

changeset/src/lib.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 use std::{
     collections::{HashMap, HashSet},
     hash::Hash,

coordinates/Cargo.toml

@@ -2,6 +2,8 @@
 name = "coordinates"
 version = "0.1.0"
 edition = "2021"
+license = "GPL-3.0-only"
+license-file = "../COPYING"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

coordinates/src/bin/default_map.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 use coordinates::hex_map;
 use std::path::PathBuf;
 

coordinates/src/hex.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2022-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 /// Ĉi-tiu modulo enhavas la elementojn por kub-koordinato.
 ///
 /// This code is based on https://www.redblobgames.com/grids/hexagons/

emseries/Cargo.toml

@@ -3,7 +3,8 @@ name = "emseries"
 version = "0.5.1"
 authors = ["Savanni D'Gerinel <savanni@luminescent-dreams.com>"]
 description = "an Embedded Time Series database"
-license = "BSD-3-Clause"
+license = "GPL-3.0-only"
+license-file = "../COPYING"
 documentation = "https://docs.rs/emseries"
 homepage = "https://github.com/luminescent-dreams/emseries"
 repository = "https://github.com/luminescent-dreams/emseries"

emseries/src/criteria.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2020-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 use date_time_tz::DateTimeTz;
 use types::Recordable;
 
@@ -8,14 +20,12 @@ pub trait Criteria {
     fn apply<T: Recordable>(&self, record: &T) -> bool;
 }
 
-
 /// Specify two criteria that must both be matched.
 pub struct And<A: Criteria, B: Criteria> {
     pub lside: A,
     pub rside: B,
 }
 
-
 impl<A, B> Criteria for And<A, B>
 where
     A: Criteria,
@@ -26,14 +36,12 @@ where
     }
 }
 
-
 /// Specify two criteria, either of which may be matched.
 pub struct Or<A: Criteria, B: Criteria> {
     pub lside: A,
     pub rside: B,
 }
 
-
 /// Specify the starting time for a search. This consists of a UTC timestamp and a specifier as to
 /// whether the exact time is included in the search criteria.
 pub struct StartTime {
@@ -41,7 +49,6 @@ pub struct StartTime {
     pub incl: bool,
 }
 
-
 impl Criteria for StartTime {
     fn apply<T: Recordable>(&self, record: &T) -> bool {
         if self.incl {
@@ -52,7 +59,6 @@ impl Criteria for StartTime {
     }
 }
 
-
 /// Specify the ending time for a search. This consists of a UTC timestamp and a specifier as to
 /// whether the exact time is included in the search criteria.
 pub struct EndTime {
@@ -60,7 +66,6 @@ pub struct EndTime {
     pub incl: bool,
 }
 
-
 impl Criteria for EndTime {
     fn apply<T: Recordable>(&self, record: &T) -> bool {
         if self.incl {
@@ -71,7 +76,6 @@ impl Criteria for EndTime {
     }
 }
 
-
 /// Specify a list of tags that must exist on the record.
 pub struct Tags {
     pub tags: Vec<String>,
@@ -80,13 +84,10 @@ pub struct Tags {
 impl Criteria for Tags {
     fn apply<T: Recordable>(&self, record: &T) -> bool {
         let record_tags = record.tags();
-        self.tags
+        self.tags.iter().all(|v| record_tags.contains(v))
-            .iter()
-            .all(|v| record_tags.contains(v))
     }
 }
 
-
 /// Specify a criteria that searches for records matching an exact time.
 pub fn exact_time(time: DateTimeTz) -> And<StartTime, EndTime> {
     And {
@@ -98,7 +99,6 @@ pub fn exact_time(time: DateTimeTz) -> And<StartTime, EndTime> {
     }
 }
 
-
 /// Specify a criteria that searches for all records within a time range.
 pub fn time_range(
     start: DateTimeTz,

emseries/src/date_time_tz.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2020-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 extern crate chrono;
 extern crate chrono_tz;
 

emseries/src/interval.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2020-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 // NOTE: this module is a candidate for extraction into its own crate, or should be replaced with
 // an existing crate.
 

emseries/src/lib.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2020-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 /*! An Embedded Time Series Database
 
 This library provides a low-intensity time series database meant to be embedded inside of an

emseries/src/series.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2020-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 extern crate serde;
 extern crate serde_json;
 extern crate uuid;

emseries/src/types.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2020-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 use date_time_tz::DateTimeTz;
 use serde::de::DeserializeOwned;
 use serde::ser::Serialize;

emseries/tests/test_io.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2020-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 #[macro_use]
 extern crate serde_derive;
 

flake.lock

@@ -17,16 +17,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1672580127,
+        "lastModified": 1675918889,
-        "narHash": "sha256-3lW3xZslREhJogoOkjeZtlBtvFMyxHku7I/9IVehhT8=",
+        "narHash": "sha256-hy7re4F9AEQqwZxubct7jBRos6md26bmxnCjxf5utJA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "0874168639713f547c05947c76124f78441ea46c",
+        "rev": "49efda9011e8cdcd6c1aad30384cb1dc230c82fe",
         "type": "github"
       },
       "original": {
         "id": "nixpkgs",
-        "ref": "nixos-22.05",
+        "ref": "nixos-22.11",
         "type": "indirect"
       }
     },
@@ -52,7 +52,7 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "narHash": "sha256-GWnDfrKbQPb+skMMesm1WVu7a3y3GTDpYpfOv3yF4gc=",
+        "narHash": "sha256-0eO3S+2gLODqDoloufeC99PfQ5mthuN9JADzqFXid1Y=",
         "type": "tarball",
         "url": "https://github.com/oxalica/rust-overlay/archive/master.tar.gz"
       },
@@ -64,7 +64,23 @@
     "root": {
       "inputs": {
         "nixpkgs": "nixpkgs",
-        "oxalica": "oxalica"
+        "oxalica": "oxalica",
+        "unstable": "unstable"
+      }
+    },
+    "unstable": {
+      "locked": {
+        "lastModified": 1675942811,
+        "narHash": "sha256-/v4Z9mJmADTpXrdIlAjFa1e+gkpIIROR670UVDQFwIw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "724bfc0892363087709bd3a5a1666296759154b1",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
       }
     }
   },

flake.nix

@@ -2,11 +2,12 @@
   description = "Lumenescent Dreams Tools";
 
   inputs = {
-    nixpkgs.url = "nixpkgs/nixos-22.05";
+    nixpkgs.url = "nixpkgs/nixos-22.11";
+    unstable.url = "nixpkgs/nixos-unstable";
     oxalica.url = "https://github.com/oxalica/rust-overlay/archive/master.tar.gz";
   };
 
-  outputs = { self, nixpkgs, oxalica }:
+  outputs = { self, nixpkgs, unstable, oxalica }:
     let 
       version = builtins.string 0 8 self.lastModifiedDate;
       supportedSystems = [ "x86_64-linux" ];
@@ -16,6 +17,7 @@
         let
           rust_overlay = import oxalica;
           pkgs = import nixpkgs { system = "x86_64-linux"; overlays = [ rust_overlay ]; };
+          pkgs-unstable = import unstable { system = "x86_64-linux"; overlays = [ rust_overlay ]; };
           rust = pkgs.rust-bin.stable."1.65.0".default.override {
             extensions = [ "rust-src" ];
           };
@@ -23,12 +25,24 @@
         pkgs.mkShell {
           name = "ld-tools-devshell";
           buildInputs = [
+            pkgs.clang
+            pkgs.entr
             pkgs.glade
+            pkgs.glib
+            pkgs.gst_all_1.gst-plugins-bad
+            pkgs.gst_all_1.gst-plugins-base
+            pkgs.gst_all_1.gst-plugins-good
+            pkgs.gst_all_1.gst-plugins-ugly
+            pkgs.gst_all_1.gstreamer
             pkgs.gtk4
+            pkgs.nodejs
             pkgs.openssl
+            pkgs.pipewire
             pkgs.pkg-config
+            pkgs.sqlite
             rust
           ];
+          LIBCLANG_PATH="${pkgs.llvmPackages.libclang.lib}/lib";
         };
     };
 }

flow/Cargo.lock

@@ -0,0 +1,65 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "flow"
+version = "0.1.0"
+dependencies = [
+ "thiserror",
+]
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.51"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5d727cae5b39d21da60fa540906919ad737832fe0b1c165da3a34d6548c849d6"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.23"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8856d8364d252a14d474036ea1358d63c9e6965c8e5c1885c18f73d70bff9c7b"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.107"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1f4064b5b16e03ae50984a5a8ed5d4f8803e6bc1fd170a3cda91a1be4b18e3f5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "thiserror"
+version = "1.0.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a9cd18aa97d5c45c6603caea1da6628790b37f7a34b6ca89522331c5180fed0"
+dependencies = [
+ "thiserror-impl",
+]
+
+[[package]]
+name = "thiserror-impl"
+version = "1.0.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1fb327af4685e4d03fa8cbcf1716380da910eeb2bb8be417e7f9fd3fb164f36f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84a22b9f218b40614adcb3f4ff08b703773ad44fa9423e4e0d346d5db86e4ebc"

flow/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "flow"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[dev-dependencies]
+thiserror = "1"

flow/readme.md

@@ -0,0 +1,3 @@
+# Flow
+
+This is a library to help with application control flow, separating fatal errors from normal recoverable errors. This is almost entirely inspired by [Error Handling in a Correctness-Critical Rust Project](https://sled.rs/errors.html) in the sled.rs library.

flow/src/lib.rs

@@ -0,0 +1,257 @@
+//! Control Flow for Correctness-Critical applications
+//!
+//! https://sled.rs/errors.html
+//!
+//! Where the sled.rs library uses `Result<Result<A, Error>, FatalError>`, these are a little hard to
+//! work with. This library works out a set of utility functions that allow us to work with the
+//! nested errors in the same way as a regular Result.
+use std::error::Error;
+
+/// Implement this trait for the application's fatal errors.
+///
+/// Fatal errors should be things that should trigger an application shutdown. Applications should
+/// not try to recover from fatal errors, but simply bring the app to the safest shutdown point and
+/// report the best possible information to the user.
+///
+/// Examples: database corruption, or the database is unavailable in an application that cannot
+/// function without it. Graphics environment cannot be initialized in a GUI app.
+///
+/// Applications should generally have only one FatalError type. There are no handling utilities
+/// for Fatal conditions, so Fatal conditions must be handled through an ordinary `match`
+/// statement.
+pub trait FatalError: Error {}
+
+/// Flow<A, FE, E> represents a return value that might be a success, might be a fatal error, or
+/// might be a normal handleable error.
+pub enum Flow<A, FE, E> {
+    /// The operation was successful
+    Ok(A),
+    /// The operation encountered a fatal error. These should be bubbled up to a level that can
+    /// safely shut the application down.
+    Fatal(FE),
+    /// Ordinary errors. These should be handled and the application should recover gracefully.
+    Err(E),
+}
+
+impl<A, FE, E> Flow<A, FE, E> {
+    /// Apply an infallible function to a successful value.
+    pub fn map<B, O>(self, mapper: O) -> Flow<B, FE, E>
+    where
+        O: FnOnce(A) -> B,
+    {
+        match self {
+            Flow::Ok(val) => Flow::Ok(mapper(val)),
+            Flow::Fatal(err) => Flow::Fatal(err),
+            Flow::Err(err) => Flow::Err(err),
+        }
+    }
+
+    /// Apply a potentially fallible function to a successful value.
+    ///
+    /// Like `Result.and_then`, the mapping function can itself fail.
+    pub fn and_then<B, O>(self, handler: O) -> Flow<B, FE, E>
+    where
+        O: FnOnce(A) -> Flow<B, FE, E>,
+    {
+        match self {
+            Flow::Ok(val) => handler(val),
+            Flow::Fatal(err) => Flow::Fatal(err),
+            Flow::Err(err) => Flow::Err(err),
+        }
+    }
+
+    /// Map a normal error from one type to another. This is useful for converting an error from
+    /// one type to another, especially in re-throwing an underlying error. `?` syntax does not
+    /// work with `Flow`, so you will likely need to use this a lot.
+    pub fn map_err<F, O>(self, mapper: O) -> Flow<A, FE, F>
+    where
+        O: FnOnce(E) -> F,
+    {
+        match self {
+            Flow::Ok(val) => Flow::Ok(val),
+            Flow::Fatal(err) => Flow::Fatal(err),
+            Flow::Err(err) => Flow::Err(mapper(err)),
+        }
+    }
+
+    /// Provide a function to use to recover from (or simply re-throw) an error.
+    pub fn or_else<O, F>(self, handler: O) -> Flow<A, FE, F>
+    where
+        O: FnOnce(E) -> Flow<A, FE, F>,
+    {
+        match self {
+            Flow::Ok(val) => Flow::Ok(val),
+            Flow::Fatal(err) => Flow::Fatal(err),
+            Flow::Err(err) => handler(err),
+        }
+    }
+}
+
+/// Convert from a normal `Result` type to a `Flow` type. The error condition for a `Result` will
+/// be treated as `Flow::Err`, never `Flow::Fatal`.
+impl<A, FE, E> From<Result<A, E>> for Flow<A, FE, E> {
+    fn from(r: Result<A, E>) -> Self {
+        match r {
+            Ok(val) => Flow::Ok(val),
+            Err(err) => Flow::Err(err),
+        }
+    }
+}
+
+/// Convenience function to create an ok value.
+pub fn ok<A, FE: FatalError, E: Error>(val: A) -> Flow<A, FE, E> {
+    Flow::Ok(val)
+}
+
+/// Convenience function to create an error value.
+pub fn error<A, FE: FatalError, E: Error>(err: E) -> Flow<A, FE, E> {
+    Flow::Err(err)
+}
+
+/// Convenience function to create a fatal value.
+pub fn fatal<A, FE: FatalError, E: Error>(err: FE) -> Flow<A, FE, E> {
+    Flow::Fatal(err)
+}
+
+#[macro_export]
+/// Return early from the current function if the value is a fatal error.
+macro_rules! return_fatal {
+    ($x:expr) => {
+        match $x {
+            Flow::Fatal(err) => return Flow::Fatal(err),
+            Flow::Err(err) => Err(err),
+            Flow::Ok(val) => Ok(val),
+        }
+    };
+}
+
+#[macro_export]
+/// Return early from the current function is the value is an error.
+macro_rules! return_error {
+    ($x:expr) => {
+        match $x {
+            Flow::Ok(val) => val,
+            Flow::Err(err) => return Flow::Err(err),
+            Flow::Fatal(err) => return Flow::Fatal(err),
+        }
+    };
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    use thiserror::Error;
+
+    #[derive(Debug, Error)]
+    enum FatalError {
+        #[error("A fatal error occurred")]
+        FatalError,
+    }
+    impl super::FatalError for FatalError {}
+    impl PartialEq for FatalError {
+        fn eq(&self, rhs: &Self) -> bool {
+            true
+        }
+    }
+
+    #[derive(Debug, Error)]
+    enum Error {
+        #[error("an error occurred")]
+        Error,
+    }
+    impl PartialEq for Error {
+        fn eq(&self, rhs: &Self) -> bool {
+            true
+        }
+    }
+
+    impl PartialEq for Flow<i32, FatalError, Error> {
+        fn eq(&self, rhs: &Self) -> bool {
+            match (self, rhs) {
+                (Flow::Ok(val), Flow::Ok(rhs)) => val == rhs,
+                (Flow::Err(_), Flow::Err(_)) => true,
+                (Flow::Fatal(_), Flow::Fatal(_)) => true,
+                _ => false,
+            }
+        }
+    }
+
+    impl std::fmt::Debug for Flow<i32, FatalError, Error> {
+        fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+            match self {
+                Flow::Ok(val) => f.write_fmt(format_args!("Flow::Ok {}", val)),
+                Flow::Err(err) => f.write_fmt(format_args!("Flow::Err {:?}", err)),
+                Flow::Fatal(err) => f.write_fmt(format_args!("Flow::Fatal {:?}", err)),
+            }
+        }
+    }
+
+    #[test]
+    fn it_can_map_things() {
+        let success = ok(15);
+        assert_eq!(ok(16), success.map(|v| v + 1));
+    }
+
+    #[test]
+    fn it_can_chain_success() {
+        let success = ok(15);
+        assert_eq!(ok(16), success.and_then(|v| ok(v + 1)));
+    }
+
+    #[test]
+    fn it_can_handle_an_error() {
+        let failure = error(Error::Error);
+        assert_eq!(ok(16), failure.or_else(|_| ok(16)));
+    }
+
+    #[test]
+    fn early_exit_on_fatal() {
+        fn ok_func() -> Flow<i32, FatalError, Error> {
+            let value = return_fatal!(ok::<i32, FatalError, Error>(15));
+            match value {
+                Ok(_) => ok(14),
+                Err(err) => error(err),
+            }
+        }
+
+        fn err_func() -> Flow<i32, FatalError, Error> {
+            let value = return_fatal!(error::<i32, FatalError, Error>(Error::Error));
+            match value {
+                Ok(_) => panic!("shouldn't have gotten here"),
+                Err(err) => ok(0),
+            }
+        }
+
+        fn fatal_func() -> Flow<i32, FatalError, Error> {
+            return_fatal!(fatal::<i32, FatalError, Error>(FatalError::FatalError));
+            panic!("failed to bail");
+        }
+
+        fatal_func();
+        assert_eq!(ok_func(), ok(14));
+        assert_eq!(err_func(), ok(0));
+    }
+
+    #[test]
+    fn it_can_early_exit_on_all_errors() {
+        fn ok_func() -> Flow<i32, FatalError, Error> {
+            let value = return_error!(ok::<i32, FatalError, Error>(15));
+            assert_eq!(value, 15);
+            ok(14)
+        }
+
+        fn err_func() -> Flow<i32, FatalError, Error> {
+            return_error!(error::<i32, FatalError, Error>(Error::Error));
+            panic!("failed to bail");
+        }
+
+        fn fatal_func() -> Flow<i32, FatalError, Error> {
+            return_error!(fatal::<i32, FatalError, Error>(FatalError::FatalError));
+            panic!("failed to bail");
+        }
+
+        fatal_func();
+        assert_eq!(ok_func(), ok(14));
+        err_func();
+    }
+}

fluent-ergonomics/Cargo.toml

@@ -4,7 +4,8 @@ authors = ["Savanni D'Gerinel <savanni@luminescent-dreams.com>"]
 edition = "2018"
 version = "0.2.0"
 description = "An ergonomics wrapper around Fluent-RS"
-license = "AGPL-3.0-or-later"
+license = "GPL-3.0-only"
+license-file = "../COPYING"
 homepage = "https://github.com/luminescent-dreams/fluent-ergonomics"
 repository = "https://github.com/luminescent-dreams/fluent-ergonomics"
 categories = ["internationalization"]

fluent-ergonomics/src/lib.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2020-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 //! Provide a more ergonomic interface to the base Fluent library
 //!
 //! The Fluent class makes it easier to load translation bundles with language fallbacks and to go

hex-grid/Cargo.toml

@@ -2,6 +2,8 @@
 name = "hex-grid"
 version = "0.1.0"
 edition = "2021"
+license = "GPL-3.0-only"
+license-file = "../COPYING"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

ifc/Cargo.toml

@@ -6,6 +6,8 @@ authors = ["Savanni D'Gerinel <savanni@luminescent-dreams.com>"]
 edition = "2018"
 keywords = ["date", "time", "calendar"]
 categories = ["date-and-time"]
+license = "GPL-3.0-only"
+license-file = "../COPYING"
 
 [dependencies]
 chrono = "0.4"

ifc/src/lib.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2020-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 extern crate chrono;
 extern crate chrono_tz;
 

ifc/src/today.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2020-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 extern crate chrono;
 extern crate chrono_tz;
 extern crate international_fixed_calendar as IFC;

ifc/src/web.rs

@@ -1,3 +1,15 @@
+/*
+Copyright 2020-2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
 use chrono::{Datelike, Utc};
 use international_fixed_calendar as IFC;
 use iron::headers;

music-player/client/index.html

@@ -0,0 +1,79 @@
+<!doctype html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <link rel="stylesheet" href="./styles.css" type="text/css" />
+    <title>Music Player</title>
+</head>
+<body>
+    <div class="currently-playing"> <span class="track-title"> Lindsey Sterling - Elements </span> <span class="player-status">[paused]</span> </div>
+    <div class="controls"><button class="play-pause">Pause</button></div>
+
+    <div class="track-list">
+        <div class="track-list__grouping">
+            <ul class="bulletless-list">
+                <li> By Artist </li>
+                <li> By Album </li>
+                <li> Work Music </li>
+                <li> Dance Music </li>
+            </ul>
+        </div>
+
+        <div class="track-list__tracks">
+            <table>
+                <thead>
+                    <tr>
+                        <th> Track # </th>
+                        <th> Title </th>
+                        <th> Artist </th>
+                        <th> Album </th>
+                        <th> Length </th>
+                    </tr>
+                </thead>
+
+                <tbody>
+                    <tr class="track-list__track-row">
+                        <td> 1 </td>
+                        <td> Underground </td>
+                        <td> Lindsey Stirling </td>
+                        <td> Artemis </td>
+                        <td> 4:24 </td>
+                    </tr>
+                    <tr class="track-list__track-row">
+                        <td> 2 </td>
+                        <td> Artemis </td>
+                        <td> Lindsey Stirling </td>
+                        <td> Artemis </td>
+                        <td> 3:54 </td>
+                    </tr>
+                    <tr class="track-list__track-row">
+                        <td> 3 </td>
+                        <td> Til the Light Goes Out </td>
+                        <td> Lindsey Stirling </td>
+                        <td> Artemis </td>
+                        <td> 4:46 </td>
+                    </tr>
+                    <tr class="track-list__track-row">
+                        <td> 4 </td>
+                        <td> Between Twilight </td>
+                        <td> Lindsey Stirling </td>
+                        <td> Artemis </td>
+                        <td> 4:20 </td>
+                    </tr>
+                    <tr class="track-list__track-row">
+                        <td> 5 </td>
+                        <td> Foreverglow </td>
+                        <td> Lindsey Stirling </td>
+                        <td> Artemis </td>
+                        <td> 3:58 </td>
+                    </tr>
+                </tbody>
+            </table>
+        </div>
+    </div>
+
+<script src="./dist/main.js" type="module"></script>
+
+</body>
+</html>

music-player/client/package.json

@@ -0,0 +1,26 @@
+{
+  "name": "music-player-client",
+  "version": "1.0.0",
+  "description": "",
+  "main": "main.js",
+  "scripts": {
+    "build": "browserify src/main.ts -p [ tsify ] > dist/bundle.js",
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "watch": "exa index.html styles.css src/* | entr -s 'npm run build'"
+  },
+  "author": "Savanni D'Gerinel <savanni@luminescent-dreams.com>",
+  "license": "GPL-3.0-or-later",
+  "dependencies": {
+    "lodash": "^4.17.21",
+    "systemjs": "^6.13.0"
+  },
+  "devDependencies": {
+    "@types/lodash": "^4.14.191",
+    "babelify": "^10.0.0",
+    "browserify": "^17.0.0",
+    "live-server": "^1.2.2",
+    "tsify": "^5.0.4",
+    "typescript": "^4.9.4",
+    "watchify": "^4.0.0"
+  }
+}

music-player/client/src/main.ts

@@ -0,0 +1,27 @@
+import * as _ from "lodash";
+
+const replaceTitle = () => {
+  const title = document.querySelector(".js-title");
+  if (title && title.innerHTML) {
+    title.innerHTML = "Music Player Paused";
+  }
+};
+
+/*
+const checkWeatherService = () => {
+    fetch("https://api.weather.gov/")
+        .then((r) => r.json())
+        .then((js) => {
+            const weather = document.querySelector('.js-weather');
+            weather.innerHTML = js.status;
+        });
+}
+*/
+
+const run = () => {
+  replaceTitle();
+  console.log(_.map([4, 8], (x) => x * x));
+  // checkWeatherService();
+};
+
+run();

music-player/client/styles.css

@@ -0,0 +1,39 @@
+body {
+    background-color: rgb(240, 230, 230);
+}
+
+.currently-playing {
+    padding: 8px;
+}
+
+.controls {
+    padding: 8px;
+}
+
+.track-list {
+    border: 1px solid black;
+    display: flex;
+}
+
+.track-list__grouping {
+    padding: 8px;
+    border-style: solid;
+    border-width: 0px 5px 0px 0px;
+}
+
+.bulletless-list {
+    list-style: none;
+}
+
+.track-list__track-row {
+    background-color: rgb(10, 10, 10);
+}
+
+.track-list__track-row:nth-child(even) {
+    background-color: rgb(255, 255, 255);
+}
+
+.track-list__track-row:nth-child(odd) {
+    background-color: rgb(200, 200, 200);
+}
+

music-player/client/tsconfig.json

@@ -0,0 +1,11 @@
+{
+  "compilerOptions": {
+      "target": "es2015",
+      "module": "commonjs",
+      "moduleResolution": "node",
+      "rootDir": "src",
+      "outDir": "./dist",
+      "lib": ["es2016", "DOM"],
+      "sourceMap": true
+  }
+}

music-player/errors.rs

@@ -0,0 +1,7 @@
+pub use flow::error;
+
+pub enum FatalError {
+    UnexpectedError,
+}
+
+impl flow::FatalError for FatalError {}

music-player/server/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "music-player"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+dbus        = { version = "0.9.7" }
+flow        = { path = "../../flow" }
+mpris       = { version = "2.0" }
+rusqlite    = { version = "0.28" }
+serde       = { version = "1.0", features = ["derive"] }
+thiserror   = { version = "1.0" }
+tokio       = { version = "1.24", features = ["full"] }
+url         = { version = "2.3" }
+uuid        = { version = "1", features = ["v4"] }
+warp        = { version = "0.3" }
+
+[lib]

music-player/server/src/audio.rs

@@ -0,0 +1,308 @@
+/*
+Copyright 2023, Savanni D'Gerinel <savanni@luminescent-dreams.com>
+
+This file is part of the Luminescent Dreams Tools.
+
+Luminescent Dreams Tools is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+Luminescent Dreams Tools is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with Lumeto. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+use dbus::ffidisp::Connection;
+use mpris::{FindingError, PlaybackStatus, Player, PlayerFinder, ProgressTick};
+use serde::Serialize;
+use std::{
+    path::PathBuf,
+    sync::mpsc::{channel, Receiver, Sender, TryRecvError},
+    thread,
+    time::Duration,
+};
+use thiserror::Error;
+
+pub enum Message {
+    Quit,
+}
+
+#[derive(Clone, Debug)]
+pub enum Event {
+    Paused(Track, Duration),
+    Playing(Track, Duration),
+    Stopped,
+    Position(Track, Duration),
+}
+
+#[derive(Debug)]
+pub struct DeviceInformation {
+    pub address: String,
+    pub name: String,
+}
+
+pub fn list_devices(conn: Connection) -> Result<Vec<DeviceInformation>, FindingError> {
+    Ok(PlayerFinder::for_connection(conn)
+        .find_all()?
+        .into_iter()
+        .map(|player| DeviceInformation {
+            address: player.unique_name().to_owned(),
+            name: player.identity().to_owned(),
+        })
+        .collect())
+}
+
+#[derive(Debug, Error)]
+pub enum AudioError {
+    #[error("DBus device was not found")]
+    DeviceNotFound,
+
+    #[error("DBus connection lost or otherwise failed")]
+    ConnectionLost,
+
+    #[error("Specified media cannot be found")]
+    MediaNotFound,
+
+    #[error("Play was ordered, but nothing is in the queue")]
+    NothingInQueue,
+
+    #[error("Unknown dbus error")]
+    DbusError(dbus::Error),
+
+    #[error("Unknown problem with mpris")]
+    MprisError(mpris::DBusError),
+
+    #[error("url parse error {0}")]
+    UrlError(url::ParseError),
+}
+
+impl From<dbus::Error> for AudioError {
+    fn from(err: dbus::Error) -> Self {
+        Self::DbusError(err)
+    }
+}
+
+impl From<mpris::DBusError> for AudioError {
+    fn from(err: mpris::DBusError) -> Self {
+        Self::MprisError(err)
+    }
+}
+
+impl From<url::ParseError> for AudioError {
+    fn from(err: url::ParseError) -> Self {
+        Self::UrlError(err)
+    }
+}
+
+#[derive(Clone, Debug, Eq, Hash, PartialEq, Serialize)]
+pub struct TrackId(String);
+
+impl Default for TrackId {
+    fn default() -> Self {
+        Self(uuid::Uuid::new_v4().as_hyphenated().to_string())
+    }
+}
+
+impl From<String> for TrackId {
+    fn from(id: String) -> Self {
+        Self(id)
+    }
+}
+
+impl AsRef<String> for TrackId {
+    fn as_ref<'a>(&'a self) -> &'a String {
+        &self.0
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct TrackInfo {
+    pub track_number: Option<i32>,
+    pub name: Option<String>,
+    pub album: Option<String>,
+    pub artist: Option<String>,
+}
+
+#[derive(Clone, Debug, PartialEq, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Track {
+    pub id: TrackId,
+    pub track_number: Option<i32>,
+    pub name: Option<String>,
+    pub album: Option<String>,
+    pub artist: Option<String>,
+}
+
+/*
+impl From<&mpris::Metadata> for Track {
+    fn from(data: &mpris::Metadata) -> Self {
+        Self {
+            id: data.track_id().unwrap(),
+            track_number: data.track_number(),
+            name: data.title().map(|s| s.to_owned()),
+            album: data.album_name().map(|s| s.to_owned()),
+            artist: None,
+        }
+    }
+}
+
+impl From<mpris::Metadata> for Track {
+    fn from(data: mpris::Metadata) -> Self {
+        Self::from(&data)
+    }
+}
+*/
+
+#[derive(Clone, Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub enum State {
+    Playing(Track),
+    Paused(Track),
+    Stopped,
+}
+
+pub struct CurrentlyPlaying {
+    track: Track,
+    position: Duration,
+}
+
+#[derive(Clone, Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Capabilities {
+    pub can_control: bool,
+    pub can_pause: bool,
+    pub can_play: bool,
+    pub supports_track_lists: bool,
+}
+
+pub trait AudioPlayer {
+    fn capabilities(&self) -> Result<Capabilities, AudioError>;
+    fn state(&self) -> Result<State, AudioError>;
+    fn play(&self, trackid: url::Url) -> Result<State, AudioError>;
+    fn play_pause(&self) -> Result<State, AudioError>;
+}
+
+pub struct GStreamerPlayer {
+    url: url::Url,
+}
+
+impl AudioPlayer for GStreamerPlayer {
+    fn capabilities(&self) -> Result<Capabilities, AudioError> {
+        unimplemented!()
+    }
+
+    fn state(&self) -> Result<State, AudioError> {
+        unimplemented!()
+    }
+
+    fn play(&self, trackid: url::Url) -> Result<State, AudioError> {
+        unimplemented!()
+    }
+
+    fn play_pause(&self) -> Result<State, AudioError> {
+        unimplemented!()
+    }
+}
+
+/*
+pub struct MprisDevice {
+    device_id: String,
+    player: Player,
+    state: State,
+}
+
+impl MprisDevice {
+    pub fn new(device_id: String) -> Result<MprisDevice, AudioError> {
+        let connection = Connection::new_session()?;
+        Ok(MprisDevice {
+            device_id: device_id.clone(),
+            player: mpris::Player::new(connection, device_id, 1000)?,
+            state: State::Stopped,
+        })
+    }
+
+    pub fn monitor(&mut self, control_channel: Receiver<Message>) {
+        let (tx, rx) = channel();
+        {
+            let device_id = self.device_id.clone();
+            let tx = tx.clone();
+            thread::spawn(move || {
+                MprisDevice::new(device_id)
+                    .expect("connect to bus")
+                    .monitor_progress(tx);
+            });
+        };
+
+        loop {
+            match control_channel.try_recv() {
+                Ok(Message::Quit) => return,
+                Err(TryRecvError::Empty) => {}
+                Err(TryRecvError::Disconnected) => return,
+            }
+            let event = rx.recv().expect("receive should never fail");
+            println!("event received: {:?}", event);
+        }
+    }
+
+    pub fn monitor_progress(&self, tx: Sender<Event>) {
+        let mut tracker = self
+            .player
+            .track_progress(1000)
+            .expect("can get an event stream");
+        loop {
+            let ProgressTick { progress, .. } = tracker.tick();
+            match progress.playback_status() {
+                PlaybackStatus::Playing => {
+                    tx.send(Event::Playing(
+                        Track::from(progress.metadata()),
+                        progress.position(),
+                    ))
+                    .expect("send to succeed");
+                }
+                PlaybackStatus::Paused => {
+                    tx.send(Event::Paused(
+                        Track::from(progress.metadata()),
+                        progress.position(),
+                    ))
+                    .expect("send to succeed");
+                }
+                PlaybackStatus::Stopped => {
+                    tx.send(Event::Stopped).expect("send to succeed");
+                }
+            }
+        }
+    }
+}
+
+impl AudioPlayer for MprisDevice {
+    fn capabilities(&self) -> Result<Capabilities, AudioError> {
+        Ok(Capabilities {
+            can_control: self.player.can_control()?,
+            can_pause: self.player.can_pause()?,
+            can_play: self.player.can_play()?,
+            supports_track_lists: self.player.supports_track_lists(),
+        })
+    }
+
+    fn state(&self) -> Result<State, AudioError> {
+        println!(
+            "supports track lists: {:?}",
+            self.player.supports_track_lists()
+        );
+        let metadata = self.player.get_metadata()?;
+        println!("{:?}", metadata);
+        unimplemented!("AudioPlayer state")
+    }
+
+    fn play(&self, track_id: String) -> Result<State, AudioError> {
+        println!("playing: {}", track_id);
+        self.player
+            .go_to(&mpris::TrackID::from(dbus::Path::from(track_id)))?;
+        self.player.play();
+        Ok(State::Stopped)
+    }
+
+    fn play_pause(&self) -> Result<State, AudioError> {
+        self.player.play_pause()?;
+        Ok(State::Stopped)
+    }
+}
+*/

music-player/server/src/bin/server.rs

@@ -0,0 +1,114 @@
+use flow::Flow;
+use std::{io::stdin, path::PathBuf, sync::Arc, thread, time::Duration};
+// use warp::Filter;
+
+use music_player::{core::Core, database::MemoryIndex};
+
+/*
+fn tracks() -> Vec<Track> {
+    vec![
+        Track {
+            track_number: Some(1),
+            name: Some("Underground".to_owned()),
+            album: Some("Artemis".to_owned()),
+            artist: Some("Lindsey Stirling".to_owned()),
+            path: PathBuf::from("/mnt/music/Lindsey Stirling/Artemis/01 - Underground.ogg"),
+        },
+        Track {
+            track_number: Some(2),
+            name: Some("Artemis".to_owned()),
+            album: Some("Artemis".to_owned()),
+            artist: Some("Lindsey Stirling".to_owned()),
+            path: PathBuf::from("/mnt/music/Lindsey Stirling/Artemis/02 - Artemis.ogg"),
+        },
+        Track {
+            track_number: Some(3),
+            name: Some("Til the Light Goes Out".to_owned()),
+            album: Some("Artemis".to_owned()),
+            artist: Some("Lindsey Stirling".to_owned()),
+            path: PathBuf::from(
+                "/mnt/music/Lindsey Stirling/Artemis/03 - Til the Light Goes Out.ogg",
+            ),
+        },
+        Track {
+            track_number: Some(4),
+            name: Some("Between Twilight".to_owned()),
+            album: Some("Artemis".to_owned()),
+            artist: Some("Lindsey Stirling".to_owned()),
+            path: PathBuf::from("/mnt/music/Lindsey Stirling/Artemis/04 - Between Twilight.ogg"),
+        },
+        Track {
+            track_number: Some(5),
+            name: Some("Foreverglow".to_owned()),
+            album: Some("Artemis".to_owned()),
+            artist: Some("Lindsey Stirling".to_owned()),
+            path: PathBuf::from("/mnt/music/Lindsey Stirling/Artemis/05 - Foreverglow.ogg"),
+        },
+    ]
+}
+*/
+
+#[tokio::main]
+pub async fn main() {
+    match Core::new(Arc::new(MemoryIndex::new())) {
+        Flow::Ok(core) => {
+            let mut buf = String::new();
+            let _ = stdin().read_line(&mut buf).unwrap();
+            core.exit();
+        }
+        Flow::Err(err) => println!("non-fatal error: {:?}", err),
+        Flow::Fatal(err) => println!("fatal error: {:?}", err),
+    }
+
+    /*
+    let connection = Connection::new_session().expect("to connect to dbus");
+
+    for player in list_players(connection) {
+        println!("player found: {}", player.identity());
+    }
+    */
+
+    /*
+    let devices = warp::path!("api" / "v1" / "devices")
+        .and(warp::get())
+        .map(|| {
+            let conn = Connection::new_session().expect("to connect to dbus");
+            warp::reply::json(&list_devices(conn))
+        });
+
+    let track_list = warp::path!("api" / "v1" / "tracks")
+        .and(warp::get())
+        .map(|| warp::reply::json(&tracks()));
+    let tracks_for_artist = warp::path!("api" / "v1" / "artist" / String)
+        .and(warp::get())
+        .map(|_artist: String| warp::reply::json(&tracks()));
+    let tracks_for_album = warp::path!("api" / "v1" / "album" / String)
+        .and(warp::get())
+        .map(|_album: String| warp::reply::json(&tracks()));
+
+    let queue = warp::path!("api" / "v1" / "queue")
+        .and(warp::get())
+        .map(|| {
+            let conn = Connection::new_session().expect("to connect to dbus");
+            warp::reply::json(&list_tracks(conn))
+        });
+
+    let playing_status = warp::path!("api" / "v1" / "play-pause")
+        .and(warp::get())
+        .map(|| warp::reply::json(&PlayPause::Paused));
+
+    let routes = devices
+        .or(track_list)
+        .or(tracks_for_album)
+        .or(tracks_for_artist)
+        .or(queue)
+        .or(playing_status);
+    let server = warp::serve(routes);
+    server
+        .run(SocketAddr::new(
+            IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)),
+            8002,
+        ))
+        .await;
+        */
+}

music-player/server/src/core.rs

@@ -0,0 +1,181 @@
+use crate::{
+    database::{Database, MemoryIndex, MusicIndex},
+    Error, FatalError,
+};
+use flow::{error, fatal, ok, return_error, return_fatal, Flow};
+use std::{
+    path::{Path, PathBuf},
+    sync::{
+        mpsc::{channel, Receiver, RecvTimeoutError, Sender},
+        Arc,
+    },
+    thread,
+    thread::JoinHandle,
+    time::{Duration, Instant},
+};
+
+#[derive(Debug, Error)]
+pub enum ScannerError {
+    #[error("Cannot scan {0}")]
+    CannotScan(PathBuf),
+    #[error("IO error {0}")]
+    IO(std::io::Error),
+}
+
+impl From<std::io::Error> for ScannerError {
+    fn from(err: std::io::Error) -> Self {
+        Self::IO(err)
+    }
+}
+
+pub enum ControlMsg {
+    Exit,
+}
+
+pub enum TrackMsg {
+    DbUpdate,
+}
+
+pub enum PlaybackMsg {
+    PositionUpdate,
+    Playing,
+    Pausing,
+    Stopping,
+}
+
+pub struct Core {
+    db: Arc<dyn MusicIndex>,
+    track_handle: JoinHandle<()>,
+    track_rx: Receiver<TrackMsg>,
+    playback_handle: JoinHandle<()>,
+    playback_rx: Receiver<PlaybackMsg>,
+    control_tx: Sender<ControlMsg>,
+}
+
+fn scan_frequency() -> Duration {
+    Duration::from_secs(60)
+}
+
+pub struct FileScanner {
+    db: Arc<dyn MusicIndex>,
+    control_rx: Receiver<ControlMsg>,
+    tracker_tx: Sender<TrackMsg>,
+    next_scan: Instant,
+    music_directories: Vec<PathBuf>,
+}
+
+impl FileScanner {
+    fn new(
+        db: Arc<dyn MusicIndex>,
+        roots: Vec<PathBuf>,
+        control_rx: Receiver<ControlMsg>,
+        tracker_tx: Sender<TrackMsg>,
+    ) -> Self {
+        Self {
+            db,
+            control_rx,
+            tracker_tx,
+            next_scan: Instant::now(),
+            music_directories: roots,
+        }
+    }
+
+    fn scan(&mut self) {
+        loop {
+            match self.control_rx.recv_timeout(Duration::from_millis(100)) {
+                Ok(ControlMsg::Exit) => return,
+                Err(RecvTimeoutError::Timeout) => (),
+                Err(RecvTimeoutError::Disconnected) => return,
+            }
+            if Instant::now() >= self.next_scan {
+                for root in self.music_directories.iter() {
+                    self.scan_dir(vec![root.clone()]);
+                }
+                self.next_scan = Instant::now() + scan_frequency();
+            }
+        }
+    }
+
+    fn scan_dir(&self, mut paths: Vec<PathBuf>) -> Flow<(), FatalError, ScannerError> {
+        while let Some(dir) = paths.pop() {
+            println!("scanning {:?}", dir);
+            return_error!(self.scan_dir_(&mut paths, dir));
+        }
+        ok(())
+    }
+
+    fn scan_dir_(
+        &self,
+        paths: &mut Vec<PathBuf>,
+        dir: PathBuf,
+    ) -> Flow<(), FatalError, ScannerError> {
+        let dir_iter = return_error!(Flow::from(dir.read_dir().map_err(ScannerError::from)));
+        for entry in dir_iter {
+            match entry {
+                Ok(entry) if entry.path().is_dir() => paths.push(entry.path()),
+                Ok(entry) => {
+                    let _ = return_fatal!(self.scan_file(entry.path()).or_else(|err| {
+                        println!("scan_file failed: {:?}", err);
+                        ok::<(), FatalError, ScannerError>(())
+                    }));
+                    ()
+                }
+                Err(err) => {
+                    println!("scan_dir could not read path: ({:?})", err);
+                }
+            }
+        }
+        ok(())
+    }
+
+    fn scan_file(&self, path: PathBuf) -> Flow<(), FatalError, ScannerError> {
+        ok(())
+    }
+}
+
+impl Core {
+    pub fn new(db: Arc<dyn MusicIndex>) -> Flow<Core, FatalError, Error> {
+        let (control_tx, control_rx) = channel::<ControlMsg>();
+
+        let (track_handle, track_rx) = {
+            let (track_tx, track_rx) = channel();
+            let db = db.clone();
+            let track_handle = thread::spawn(move || {
+                FileScanner::new(
+                    db,
+                    vec![PathBuf::from("/home/savanni/Music/")],
+                    control_rx,
+                    track_tx,
+                )
+                .scan();
+            });
+            (track_handle, track_rx)
+        };
+
+        let (playback_handle, playback_rx) = {
+            let (playback_tx, playback_rx) = channel();
+            let playback_handle = thread::spawn(move || {});
+            (playback_handle, playback_rx)
+        };
+
+        ok(Core {
+            db,
+            track_handle,
+            track_rx,
+            playback_handle,
+            playback_rx,
+            control_tx,
+        })
+    }
+
+    pub fn exit(&self) {
+        let _ = self.control_tx.send(ControlMsg::Exit);
+        /*
+        self.track_handle.join();
+        self.playback_handle.join();
+        */
+    }
+}
+
+#[cfg(test)]
+mod test {}

music-player/server/src/database.rs

@@ -0,0 +1,106 @@
+use crate::{
+    audio::{Track, TrackId, TrackInfo},
+    FatalError,
+};
+use flow::{error, ok, Flow};
+use rusqlite::Connection;
+use std::collections::HashMap;
+use std::{
+    path::PathBuf,
+    sync::{Arc, Mutex, RwLock},
+};
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum DatabaseError {
+    #[error("database is unreadable")]
+    DatabaseUnreadable,
+    #[error("unhandled database problem: {0}")]
+    UnhandledError(rusqlite::Error),
+}
+
+pub trait MusicIndex: Sync + Send {
+    fn add_track(&mut self, track: &TrackInfo) -> Flow<Track, FatalError, DatabaseError>;
+    fn remove_track(&mut self, id: &TrackId) -> Flow<(), FatalError, DatabaseError>;
+    fn get_track_info(&self, id: &TrackId) -> Flow<Option<Track>, FatalError, DatabaseError>;
+}
+
+pub struct MemoryIndex {
+    tracks: RwLock<HashMap<TrackId, Track>>,
+}
+
+impl MemoryIndex {
+    pub fn new() -> MemoryIndex {
+        MemoryIndex {
+            tracks: RwLock::new(HashMap::default()),
+        }
+    }
+}
+
+impl MusicIndex for MemoryIndex {
+    fn add_track(&mut self, info: &TrackInfo) -> Flow<Track, FatalError, DatabaseError> {
+        let id = TrackId::default();
+        let track = Track {
+            id: id.clone(),
+            track_number: info.track_number,
+            name: info.name.clone(),
+            album: info.album.clone(),
+            artist: info.artist.clone(),
+        };
+        let mut tracks = self.tracks.write().unwrap();
+        tracks.insert(id, track.clone());
+        ok(track)
+    }
+
+    fn remove_track(&mut self, id: &TrackId) -> Flow<(), FatalError, DatabaseError> {
+        let mut tracks = self.tracks.write().unwrap();
+        tracks.remove(&id);
+        ok(())
+    }
+
+    fn get_track_info<'a>(
+        &'a self,
+        id: &TrackId,
+    ) -> Flow<Option<Track>, FatalError, DatabaseError> {
+        let track = {
+            let tracks = self.tracks.read().unwrap();
+            tracks.get(&id).cloned()
+        };
+        ok(track)
+    }
+}
+
+pub struct ManagedConnection<'a> {
+    pool: &'a Database,
+    conn: Option<Connection>,
+}
+
+impl<'a> Drop for ManagedConnection<'a> {
+    fn drop(&mut self) {
+        self.pool.r(self.conn.take().unwrap());
+    }
+}
+
+#[derive(Clone)]
+pub struct Database {
+    path: PathBuf,
+    pool: Arc<Mutex<Vec<Connection>>>,
+}
+
+impl Database {
+    pub fn new(path: PathBuf) -> Flow<Database, FatalError, DatabaseError> {
+        let connection = match Connection::open(path.clone()) {
+            Ok(connection) => connection,
+            Err(err) => return error(DatabaseError::UnhandledError(err)),
+        };
+        ok(Database {
+            path,
+            pool: Arc::new(Mutex::new(vec![connection])),
+        })
+    }
+
+    pub fn r(&self, conn: Connection) {
+        let mut pool = self.pool.lock().unwrap();
+        pool.push(conn);
+    }
+}

music-player/server/src/lib.rs

@@ -0,0 +1,25 @@
+pub mod audio;
+pub mod core;
+pub mod database;
+use database::DatabaseError;
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("Database error: {0}")]
+    DatabaseError(DatabaseError),
+}
+
+impl From<DatabaseError> for Error {
+    fn from(err: DatabaseError) -> Self {
+        Self::DatabaseError(err)
+    }
+}
+
+#[derive(Debug, Error)]
+pub enum FatalError {
+    #[error("Unexpected error")]
+    UnexpectedError,
+}
+
+impl flow::FatalError for FatalError {}

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@@ -0,0 +1,514 @@
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music-player/streamer/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "streamer"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+gstreamer = "0.19.7"
+

music-player/streamer/src/main.rs

@@ -0,0 +1,46 @@
+use gstreamer::{format::ClockTime, prelude::*, MessageView};
+use std::{thread, time, time::Duration};
+
+fn main() {
+    gstreamer::init().unwrap();
+
+    let uri = "file:///home/savanni/Music/Lindsey%20Stirling/Artemis/01%20-%20Underground.mp3.mp3";
+    let pipeline = gstreamer::parse_launch(&format!("playbin uri={}", uri)).unwrap();
+    pipeline.set_state(gstreamer::State::Playing).unwrap();
+
+    let message_handler = {
+        let pipeline = pipeline.clone();
+        thread::spawn(move || {
+            let bus = pipeline.bus().unwrap();
+            for msg in bus.iter_timed(gstreamer::ClockTime::NONE) {
+                match msg.view() {
+                    MessageView::Eos(_) => (),
+                    MessageView::Error(err) => {
+                        println!(
+                            "Error from {:?}: {} ({:?})",
+                            err.src().map(|s| s.path_string()),
+                            err.error(),
+                            err.debug()
+                        );
+                    }
+                    msg => println!("{:?}", msg),
+                }
+            }
+        })
+    };
+
+    let query_handler = {
+        let pipeline = pipeline.clone();
+        thread::spawn(move || loop {
+            let position: Option<ClockTime> = pipeline.query_position();
+            let duration: Option<ClockTime> = pipeline.query_duration();
+            println!("{:?} {:?}", position, duration);
+            thread::sleep(Duration::from_millis(100));
+        })
+    };
+
+    message_handler.join();
+    query_handler.join();
+
+    pipeline.set_state(gstreamer::State::Null).unwrap();
+}