add ui

Cargo.toml

@@ -20,3 +20,10 @@ serde_yaml = "0.8"
 regex = "1"
 globset = "0.4"
 derive_more = "0.99"
+crossterm = "0.18"
+tui = { version = "0.13", default-features = false, features = ["crossterm"] }
+
+[dependencies.tokio]
+version = "0.3"
+default-features = false
+features = ["sync", "rt", "macros", "time"]

flake.lock

@@ -1,5 +1,20 @@
 {
   "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,
@@ -17,41 +32,24 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1606667422,
+        "lastModified": 1608363953,
-        "narHash": "sha256-NhCeG6NpetMWkflygIn6vHipuxFbrKzlFScr8+PONYQ=",
+        "narHash": "sha256-/gAJNaV0a9Yqx8i2CXkkw3H7LhL5Tw3aUao51S9AVKc=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "3c72bb875e67ad1bce805fe26a8a5d3a0e8078ed",
+        "rev": "453c116254abe3d7b6b9938ff8092447333db1aa",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-20.09",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs-unstable": {
-      "locked": {
-        "lastModified": 1606725183,
-        "narHash": "sha256-QIdgDJUnT/Gq8vURmQqy1tTVpI0cWryoD9/auCAkQbE=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "24eb3f87fc610f18de7076aee7c5a84ac5591e3e",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixos-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }
     },
     "root": {
       "inputs": {
+        "flake-utils": "flake-utils",
         "import-cargo": "import-cargo",
-        "nixpkgs": "nixpkgs",
+        "nixpkgs": "nixpkgs"
-        "nixpkgs-unstable": "nixpkgs-unstable"
       }
     }
   },

flake.nix

@@ -2,18 +2,35 @@
     description = "Converts audio files";
 
     inputs = {
+        nixpkgs.url = github:NixOS/nixpkgs;
+        flake-utils.url = "github:numtide/flake-utils";
         import-cargo.url = github:edolstra/import-cargo;
-        nixpkgs.url = github:NixOS/nixpkgs/nixos-20.09;
-        nixpkgs-unstable.url = github:NixOS/nixpkgs/nixos-unstable;
     };
 
-    outputs = { self, nixpkgs, nixpkgs-unstable, import-cargo }:
+    outputs = { self, flake-utils, nixpkgs, import-cargo }:
-        let
+        flake-utils.lib.eachDefaultSystem (system:
-            inherit (import-cargo.builders) importCargo;
+            let
-        in {
+                pkgs = import nixpkgs { inherit system; };
-            defaultPackage.x86_64-linux =
+
-                with import nixpkgs { system = "x86_64-linux"; };
+                buildtimeDeps = with pkgs; [
-                stdenv.mkDerivation {
+                    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;
 
@@ -21,22 +38,10 @@
                         # setupHook which makes sure that a CARGO_HOME with vendored dependencies
                         # exists
                         (importCargo { lockFile = ./Cargo.lock; inherit pkgs; }).cargoHome
+                    ]
+                        ++ buildtimeDeps;
 
-                        # Build-time dependencies
+                    buildInputs = runtimeDeps;
-                        cargo
-                        rustc
-                        pkg-config
-                    ];
-
-                    buildInputs = [
-                        gst_all_1.gstreamer
-
-                        # needed for opus, resample, ...
-                        gst_all_1.gst-plugins-base
-
-                        # needed for flac
-                        gst_all_1.gst-plugins-good
-                    ];
 
                     buildPhase = ''
                         cargo build --release --offline
@@ -47,25 +52,12 @@
                     '';
                 };
 
-            devShell.x86_64-linux =
+                devShell = pkgs.stdenv.mkDerivation {
-                with import nixpkgs-unstable { system = "x86_64-linux"; };
-                stdenv.mkDerivation {
                     name = "audio-conv";
-                    buildInputs = [
+                    buildInputs = [ pkgs.rustfmt pkgs.rust-analyzer ]
-                        cargo
+                        ++ buildtimeDeps
-                        rustc
+                        ++ runtimeDeps;
-                        rustfmt
-                        rust-analyzer
-
-                        pkg-config
-                        gst_all_1.gstreamer
-
-                        # needed for opus, resample, ...
-                        gst_all_1.gst-plugins-base
-
-                        # needed for flac
-                        gst_all_1.gst-plugins-good
-                    ];
                 };
-        };
+            }
+        );
 }

src/main.rs

@@ -1,8 +1,9 @@
 mod config;
+mod ui;
 
 use crate::config::Config;
 use anyhow::{Context, Error, Result};
-use futures::{channel::mpsc, prelude::*};
+use futures::{future, pin_mut, prelude::*};
 use glib::{subclass::prelude::*, GBoxed, GString};
 use gstreamer::{gst_element_error, prelude::*, Element};
 use gstreamer_base::prelude::*;
@@ -10,10 +11,14 @@ use std::{
     borrow::Cow,
     error::Error as StdError,
     ffi, fmt,
+    fmt::Write as FmtWrite,
+    io::Write as IoWrite,
     path::{Path, PathBuf},
     result::Result as StdResult,
     sync::Arc,
+    time::Duration,
 };
+use tokio::{task, time::interval};
 
 #[derive(Clone, Debug, GBoxed)]
 #[gboxed(type_name = "GBoxErrorWrapper")]
@@ -62,13 +67,12 @@ fn gmake<T: IsA<Element>>(factory_name: &str) -> Result<T> {
 }
 
 #[derive(Debug, Clone)]
-struct ConvertionArgs {
+pub struct ConvertionArgs {
-    from: PathBuf,
+    rel_from_path: PathBuf,
-    to: PathBuf,
     transcode: config::Transcode,
 }
 
-fn get_path_pairs(config: Config) -> impl Iterator<Item = ConvertionArgs> {
+fn get_convertion_args(config: &Config) -> impl Iterator<Item = ConvertionArgs> + '_ {
     walkdir::WalkDir::new(&config.from)
         .into_iter()
         .filter_map(|e| e.ok())
@@ -88,7 +92,9 @@ fn get_path_pairs(config: Config) -> impl Iterator<Item = ConvertionArgs> {
                 return None;
             };
 
-            let mut to = config.to.join(e.path().strip_prefix(&config.from).unwrap());
+            let rel_path = e.path().strip_prefix(&config.from).unwrap();
+
+            let mut to = config.to.join(&rel_path);
             to.set_extension(transcode.extension());
 
             let is_newer = {
@@ -107,54 +113,133 @@ fn get_path_pairs(config: Config) -> impl Iterator<Item = ConvertionArgs> {
             }
 
             Some(ConvertionArgs {
-                from: e.path().to_path_buf(),
+                rel_from_path: rel_path.to_path_buf(),
-                to,
                 transcode,
             })
         })
 }
 
-fn main() -> Result<()> {
+#[tokio::main(flavor = "current_thread")]
-    gstreamer::init()?;
+async fn main() -> Result<()> {
-    let config = config::config().context("could not get the config")?;
+    task::LocalSet::new()
+        .run_until(async move {
+            let (ui_queue, ui_fut) = ui::init();
 
-    let (pair_tx, pair_rx) = mpsc::channel(16);
+            let main_handle = async move {
+                let ok = task::spawn_local(main_loop(ui_queue))
+                    .await
+                    .context("main task failed")??;
+                Result::<_>::Ok(ok)
+            };
 
-    // move blocking directory reading to an external thread
+            let ui_handle = async move {
-    let pair_producer = std::thread::spawn(|| {
+                let ok = task::spawn_local(ui_fut)
-        let produce_pairs = futures::stream::iter(get_path_pairs(config))
+                    .await
-            .map(Ok)
+                    .context("ui task failed")?
-            .forward(pair_tx)
+                    .context("ui failed")?;
-            .map(|res| res.context("sending path pairs failed"));
+                Result::<_>::Ok(ok)
-        futures::executor::block_on(produce_pairs)
+            };
+
+            future::try_join(main_handle, ui_handle).await?;
+            Ok(())
+        })
+        .await
+}
+
+async fn main_loop(ui_queue: ui::MsgQueue) -> Result<()> {
+    let (config, conv_args) = task::spawn_blocking(|| -> Result<_> {
+        gstreamer::init()?;
+        let config = config::config().context("could not get the config")?;
+
+        let conv_args = get_convertion_args(&config).collect::<Vec<_>>();
+
+        Ok((config, conv_args))
+    })
+    .await
+    .context("init task failed")??;
+
+    let log_path = Path::new("./audio-conv.log")
+        .canonicalize()
+        .context("unable to canonicalize path to log file")?;
+
+    ui_queue.push(ui::Msg::Init {
+        task_len: conv_args.len(),
+        log_path: log_path.clone(),
     });
 
-    let transcoder = pair_rx.for_each_concurrent(num_cpus::get(), |args| async move {
+    stream::iter(conv_args.into_iter().enumerate())
-        if let Err(err) = transcode(&args).await {
+        .map(Ok)
-            println!(
+        .try_for_each_concurrent(num_cpus::get(), |(i, args)| {
-                "err {} => {}:\n{:?}",
+            let config = config.clone();
-                args.from.display(),
+            let msg_queue = ui_queue.clone();
-                args.to.display(),
+            let log_path = &log_path;
-                err
-            );
-        }
-    });
-    futures::executor::block_on(transcoder);
 
-    pair_producer
+            async move {
-        .join()
+                msg_queue.push(ui::Msg::TaskStart {
-        .expect("directory reading thread panicked")?;
+                    id: i,
+                    args: args.clone(),
+                });
+
+                match transcode(&config, &args, i, &msg_queue).await {
+                    Ok(()) => msg_queue.push(ui::Msg::TaskEnd { id: i }),
+                    Err(err) => {
+                        let err = err.context(format!(
+                            "failed transcoding \"{}\"",
+                            args.rel_from_path.display()
+                        ));
+
+                        let mut log_file = match std::fs::OpenOptions::new()
+                            .create(true)
+                            .append(true)
+                            .open(log_path)
+                        {
+                            Ok(log_file) => log_file,
+                            Err(fs_err) => {
+                                let err = err.context(fs_err).context("Unable to open log file");
+                                return Err(err);
+                            }
+                        };
+
+                        let mut err_str = String::new();
+                        write!(&mut err_str, "{:?}\n", err).context("TODO")?;
+
+                        log_file.write_all(err_str.as_ref()).map_err(|fs_err| {
+                            err.context(format!(
+                                "Unable to write transcoding error to log file (fs error: {})",
+                                fs_err
+                            ))
+                        })?;
+
+                        msg_queue.push(ui::Msg::TaskError { id: i });
+                    }
+                }
+
+                Result::<_>::Ok(())
+            }
+        })
+        .await?;
+
+    ui_queue.push(ui::Msg::Exit);
 
     Ok(())
 }
 
-async fn transcode(args: &ConvertionArgs) -> Result<()> {
+async fn transcode(
+    config: &Config,
+    args: &ConvertionArgs,
+    task_id: usize,
+    queue: &ui::MsgQueue,
+) -> Result<()> {
+    let from_path = config.from.join(&args.rel_from_path);
+    let mut to_path = config.to.join(&args.rel_from_path);
+    to_path.set_extension(args.transcode.extension());
+
     let file_src: Element = gmake("filesrc")?;
-    file_src.set_property("location", &path_to_gstring(&args.from))?;
+    file_src.set_property("location", &path_to_gstring(&from_path))?;
 
     // encode into a tmp file first, then rename to actuall file name, that way we're writing
     // "whole" files to the intended file path, ignoring partial files in the mtime check
-    let tmp_dest = args.to.with_extension("tmp");
+    let to_path_tmp = to_path.with_extension("tmp");
 
     let decodebin: Element = gmake("decodebin")?;
 
@@ -170,7 +255,7 @@ async fn transcode(args: &ConvertionArgs) -> Result<()> {
 
     let transcode_args = args.transcode.clone();
 
-    let tmp_dest_clone = tmp_dest.clone();
+    let to_path_tmp_clone = to_path_tmp.clone();
 
     decodebin.connect_pad_added(move |decodebin, src_pad| {
         let insert_sink = || -> Result<()> {
@@ -238,7 +323,7 @@ async fn transcode(args: &ConvertionArgs) -> Result<()> {
             };
 
             let file_dest: gstreamer_base::BaseSink = gmake("filesink")?;
-            file_dest.set_property("location", &path_to_gstring(&tmp_dest_clone))?;
+            file_dest.set_property("location", &path_to_gstring(&to_path_tmp_clone))?;
             file_dest.set_sync(false);
             dest_elems.push(file_dest.upcast());
 
@@ -277,78 +362,119 @@ async fn transcode(args: &ConvertionArgs) -> Result<()> {
     let bus = pipeline.get_bus().context("pipe get bus")?;
 
     std::fs::create_dir_all(
-        args.to
+        to_path
             .parent()
-            .with_context(|| format!("could not get parent dir for {}", args.to.display()))?,
+            .with_context(|| format!("could not get parent dir for {}", to_path.display()))?,
     )?;
 
-    rm_file_on_err(&tmp_dest, async {
+    rm_file_on_err(&to_path_tmp, async {
         pipeline
             .set_state(gstreamer::State::Playing)
             .context("Unable to set the pipeline to the `Playing` state")?;
 
-        bus.stream()
+        let stream_processor = async {
-            .map::<Result<bool>, _>(|msg| {
+            bus.stream()
-                use gstreamer::MessageView;
+                .map::<Result<bool>, _>(|msg| {
+                    use gstreamer::MessageView;
 
-                match msg.view() {
+                    match msg.view() {
-                    MessageView::Eos(..) => {
+                        // MessageView::Progress() => {
-                        // we need to actively stop pulling the stream, that's because stream will
+
-                        // never end despite yielding an `Eos` message
+                        // }
-                        Ok(false)
+                        MessageView::Eos(..) => {
+                            // we need to actively stop pulling the stream, that's because stream will
+                            // never end despite yielding an `Eos` message
+                            Ok(false)
+                        }
+                        MessageView::Error(err) => {
+                            pipeline.set_state(gstreamer::State::Null).context(
+                                "Unable to set the pipeline to the `Null` state, after error",
+                            )?;
+
+                            let err = err
+                                .get_details()
+                                .and_then(|details| {
+                                    if details.get_name() != "error-details" {
+                                        return None;
+                                    }
+
+                                    let err = details
+                                        .get::<&GBoxErrorWrapper>("error")
+                                        .unwrap()
+                                        .map(|err| err.clone().into())
+                                        .expect("error-details message without actual error");
+                                    Some(err)
+                                })
+                                .unwrap_or_else(|| {
+                                    GErrorMessage {
+                                        src: msg
+                                            .get_src()
+                                            .map(|s| String::from(s.get_path_string()))
+                                            .unwrap_or_else(|| String::from("None")),
+                                        error: err.get_error().to_string(),
+                                        debug: err.get_debug(),
+                                        source: err.get_error(),
+                                    }
+                                    .into()
+                                });
+                            Err(err)
+                        }
+                        _ => Ok(true),
                     }
-                    MessageView::Error(err) => {
+                })
-                        pipeline.set_state(gstreamer::State::Null).context(
+                .take_while(|e| {
-                            "Unable to set the pipeline to the `Null` state, after error",
+                    if let Ok(false) = e {
-                        )?;
+                        futures::future::ready(false)
-
+                    } else {
-                        let err = err
+                        futures::future::ready(true)
-                            .get_details()
-                            .and_then(|details| {
-                                if details.get_name() != "error-details" {
-                                    return None;
-                                }
-
-                                let err = details
-                                    .get::<&GBoxErrorWrapper>("error")
-                                    .unwrap()
-                                    .map(|err| err.clone().into())
-                                    .expect("error-details message without actual error");
-                                Some(err)
-                            })
-                            .unwrap_or_else(|| {
-                                GErrorMessage {
-                                    src: msg
-                                        .get_src()
-                                        .map(|s| String::from(s.get_path_string()))
-                                        .unwrap_or_else(|| String::from("None")),
-                                    error: err.get_error().to_string(),
-                                    debug: err.get_debug(),
-                                    source: err.get_error(),
-                                }
-                                .into()
-                            });
-                        Err(err)
                     }
-                    _ => Ok(true),
+                })
+                .try_for_each(|_| futures::future::ready(Ok(())))
+                .await
+                .context("failed converting")?;
+
+            Result::<_>::Ok(())
+        };
+        pin_mut!(stream_processor);
+
+        let mut progress_interval = interval(Duration::from_millis(ui::UPDATE_INTERVAL_MILLIS / 2));
+        let progress_processor = async {
+            use gstreamer::ClockTime;
+
+            loop {
+                progress_interval.tick().await;
+
+                let dur = decodebin
+                    .query_duration::<ClockTime>()
+                    .and_then(|time| time.nanoseconds());
+
+                let ratio = dur.and_then(|dur| {
+                    let pos = decodebin
+                        .query_position::<ClockTime>()
+                        .and_then(|time| time.nanoseconds());
+
+                    pos.map(|pos| pos as f64 / dur as f64)
+                });
+
+                if let Some(ratio) = ratio {
+                    queue.push(ui::Msg::TaskProgress { id: task_id, ratio });
                 }
-            })
+            }
-            .take_while(|e| {
+
-                if let Ok(false) = e {
+            #[allow(unreachable_code)]
-                    futures::future::ready(false)
+            Result::<_>::Ok(())
-                } else {
+        };
-                    futures::future::ready(true)
+        pin_mut!(progress_processor);
-                }
+
-            })
+        future::try_select(stream_processor, progress_processor)
-            .try_for_each(|_| futures::future::ready(Ok(())))
             .await
-            .context("failed converting")?;
+            .map_err(|err| err.factor_first().0)?;
 
         pipeline
             .set_state(gstreamer::State::Null)
             .context("Unable to set the pipeline to the `Null` state")?;
 
-        std::fs::rename(&tmp_dest, &args.to)?;
+        std::fs::rename(&to_path_tmp, &to_path)?;
 
         Ok(())
     })
@@ -362,10 +488,13 @@ where
     match f.await {
         Err(err) => match std::fs::remove_file(path) {
             Ok(..) => Err(err),
-            Err(rm_err) if rm_err.kind() == std::io::ErrorKind::NotFound => Err(err),
+            Err(fs_err) if fs_err.kind() == std::io::ErrorKind::NotFound => Err(err),
-            Err(rm_err) => Err(rm_err)
+            Err(fs_err) => {
-                .context(format!("removing {}", path.display()))
+                let err = err
-                .context(err),
+                    .context(fs_err)
+                    .context(format!("removing {} failed", path.display()));
+                Err(err)
+            }
         },
         res @ Ok(..) => res,
     }
@@ -381,16 +510,15 @@ fn path_to_bytes(path: &Path) -> Cow<'_, [u8]> {
 
     #[cfg(windows)]
     {
-        let mut buf = Vec::<u8>::new();
         // NOT TESTED
         // FIXME: test and post answer to https://stackoverflow.com/questions/38948669
         use std::os::windows::ffi::OsStrExt;
-        buf.extend(
+        let buf: Vec<u8> = path
-            path.as_os_str()
+            .as_os_str()
-                .encode_wide()
+            .encode_wide()
-                .map(|char| char.to_ne_bytes())
+            .map(|char| char.to_ne_bytes())
-                .flatten(),
+            .flatten()
-        );
+            .collect();
         Cow::Owned(buf)
     }
 }

src/ui.rs

@@ -0,0 +1,284 @@
+use crate::ConvertionArgs;
+use anyhow::{Context, Result};
+use futures::Future;
+use std::{
+    borrow::Cow, cell::RefCell, collections::HashMap, io, mem, path::PathBuf, rc::Rc,
+    time::Duration,
+};
+use tokio::{task, time::interval};
+use tui::{backend::CrosstermBackend, Terminal};
+
+pub const UPDATE_INTERVAL_MILLIS: u64 = 100;
+
+#[derive(Debug)]
+pub enum Msg {
+    Init { task_len: usize, log_path: PathBuf },
+    Exit,
+    TaskStart { id: usize, args: ConvertionArgs },
+    TaskEnd { id: usize },
+    TaskProgress { id: usize, ratio: f64 },
+    TaskError { id: usize },
+}
+
+#[derive(Debug, Clone)]
+pub struct MsgQueue {
+    inner: Rc<RefCell<Vec<Msg>>>,
+}
+
+impl MsgQueue {
+    fn new() -> MsgQueue {
+        MsgQueue {
+            inner: Rc::new(RefCell::new(Vec::new())),
+        }
+    }
+
+    pub fn push(&self, msg: Msg) {
+        self.inner.borrow_mut().push(msg);
+    }
+
+    fn swap_inner(&self, other: &mut Vec<Msg>) {
+        let mut inner = self.inner.borrow_mut();
+        mem::swap(&mut *inner, other)
+    }
+}
+
+struct State {
+    terminal: Terminal<CrosstermBackend<io::Stdout>>,
+    log_path: Option<PathBuf>,
+    task_len: Option<usize>,
+    ended_tasks: usize,
+    running_tasks: HashMap<usize, Task>,
+    has_rendered: bool,
+    has_errored: bool,
+}
+
+impl State {
+    fn new() -> Result<State> {
+        let terminal = Terminal::new(CrosstermBackend::new(io::stdout()))
+            .context("Unable to create ui terminal")?;
+
+        Ok(State {
+            terminal,
+            log_path: None,
+            task_len: None,
+            ended_tasks: 0,
+            running_tasks: HashMap::new(),
+            has_rendered: false,
+            has_errored: false,
+        })
+    }
+
+    fn process_msg(&mut self, msg: Msg) -> Result<bool> {
+        match msg {
+            Msg::Init { task_len, log_path } => {
+                self.task_len = Some(task_len);
+                self.log_path = Some(log_path);
+            }
+            Msg::Exit => return Ok(false),
+            Msg::TaskStart { id, args } => {
+                self.running_tasks.insert(
+                    id,
+                    Task {
+                        id,
+                        ratio: None,
+                        args,
+                    },
+                );
+            }
+            Msg::TaskEnd { id } => {
+                self.running_tasks
+                    .remove(&id)
+                    .context("unable to remove finished task; could't find task")?;
+                self.ended_tasks += 1;
+            }
+            Msg::TaskProgress { id, ratio } => {
+                let mut task = self
+                    .running_tasks
+                    .get_mut(&id)
+                    .context("Unable to update task progress; could't find task")?;
+                task.ratio = Some(ratio);
+            }
+            Msg::TaskError { id } => {
+                // TODO
+                self.running_tasks
+                    .remove(&id)
+                    .context("unable to remove errored task; could't find task")?;
+                self.ended_tasks += 1;
+                self.has_errored = true;
+            }
+        }
+
+        Ok(true)
+    }
+
+    fn render(&mut self) -> Result<()> {
+        use tui::{
+            layout::{Constraint, Direction, Layout, Rect},
+            style::{Color, Modifier, Style},
+            text::Text,
+            widgets::{Block, Borders, Gauge, Paragraph},
+        };
+
+        let task_len = if let Some(task_len) = self.task_len {
+            task_len
+        } else {
+            return Ok(());
+        };
+
+        let tasks_ended = self.ended_tasks;
+
+        let mut running_tasks: Vec<_> = self.running_tasks.values().cloned().collect();
+
+        running_tasks.sort_by_key(|task| task.id);
+
+        if !self.has_rendered {
+            self.terminal.clear().context("cleaning ui failed")?;
+            self.has_rendered = true;
+        }
+
+        let error_text = match self.has_errored {
+            true => {
+                let text: Cow<'static, str> = self
+                    .log_path
+                    .as_ref()
+                    .map(|lp| {
+                        let text = format!("Error(s) occurred and were logged to {}", lp.display());
+                        Cow::Owned(text)
+                    })
+                    .unwrap_or_else(|| Cow::Borrowed("Error(s) occurred"));
+                Some(text)
+            }
+            false => None,
+        };
+
+        self.terminal
+            .draw(|f| {
+                let chunks = Layout::default()
+                    .direction(Direction::Vertical)
+                    .margin(1)
+                    .constraints([Constraint::Percentage(90), Constraint::Percentage(10)].as_ref())
+                    .split(f.size());
+
+                let mut task_rect = chunks[0];
+
+                if error_text.is_some() {
+                    task_rect.height -= 3;
+                }
+
+                for (row, task) in running_tasks
+                    .into_iter()
+                    .take(task_rect.height as usize / 2)
+                    .enumerate()
+                {
+                    f.render_widget(
+                        Gauge::default()
+                            .label(task.args.rel_from_path.to_string_lossy().as_ref())
+                            .gauge_style(
+                                Style::default()
+                                    .fg(Color::White)
+                                    .bg(Color::Black)
+                                    .add_modifier(Modifier::ITALIC),
+                            )
+                            .ratio(task.ratio.unwrap_or(0.0)),
+                        Rect::new(
+                            task_rect.x,
+                            task_rect.y + row as u16 * 2,
+                            task_rect.width,
+                            1,
+                        ),
+                    );
+                }
+
+                if let Some(error_text) = error_text {
+                    f.render_widget(
+                        Paragraph::new(Text::raw(error_text)).style(
+                            Style::default()
+                                .fg(Color::Red)
+                                .bg(Color::Black)
+                                .add_modifier(Modifier::BOLD),
+                        ),
+                        Rect::new(task_rect.x, task_rect.height + 1, task_rect.width, 2),
+                    );
+                }
+
+                f.render_widget(
+                    Gauge::default()
+                        .block(
+                            Block::default()
+                                .borders(Borders::ALL)
+                                .title("Overall Progress"),
+                        )
+                        .gauge_style(
+                            Style::default()
+                                .fg(Color::White)
+                                .bg(Color::Black)
+                                .add_modifier(Modifier::ITALIC),
+                        )
+                        .ratio(tasks_ended as f64 / task_len as f64),
+                    chunks[1],
+                );
+            })
+            .context("rendering ui failed")?;
+
+        Ok(())
+    }
+
+    fn print_end_report(&mut self) -> Result<()> {
+        Ok(())
+    }
+}
+
+#[derive(Debug, Clone)]
+struct Task {
+    id: usize,
+    ratio: Option<f64>,
+    args: ConvertionArgs,
+}
+
+pub fn init() -> (MsgQueue, impl Future<Output = Result<()>>) {
+    let queue = MsgQueue::new();
+
+    let queue_clone = queue.clone();
+    let fut = async move {
+        let mut interval = interval(Duration::from_millis(UPDATE_INTERVAL_MILLIS));
+        let mut wrapped = Some((Vec::new(), State::new()?));
+
+        loop {
+            interval.tick().await;
+
+            let (mut current_queue, mut state) = wrapped.take().context("`wrapped` is None")?;
+
+            queue_clone.swap_inner(&mut current_queue);
+
+            let render_res = task::spawn_blocking(move || -> Result<_> {
+                let mut exit = false;
+                for msg in current_queue.drain(..) {
+                    if !state.process_msg(msg)? {
+                        exit = true;
+                    }
+                }
+
+                state.render()?;
+
+                if exit {
+                    state.print_end_report()?;
+                    Ok(None)
+                } else {
+                    Ok(Some((current_queue, state)))
+                }
+            })
+            .await
+            .context("ui update task failed")?
+            .context("ui update failed")?;
+
+            match render_res {
+                Some(s) => wrapped = Some(s),
+                None => break,
+            }
+        }
+
+        Result::<_>::Ok(())
+    };
+
+    (queue, fut)
+}