wip

Signed-off-by: Robin Jarry <robin@jarry.cc>

17 files changed, 1487 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 00000000..996816d3
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: MIT
+# Copyright (c) 2023 Robin Jarry
+
+[package]
+name = "aerc"
+version = "0.20.0"
+edition = "2021"
+authors = ["Robin Jarry <robin@jarry.cc>"]
+description = "A pretty good email client"
+readme = "README.md"
+homepage = "https://aerc-mail.org/"
+repository = "https://git.sr.ht/~rjarry/aerc"
+license = "MIT"
+
+[dependencies]
+anyhow = { version = "1.0.69", features = ["backtrace"] }
+bitflags = "1.3.2"
+clap = { version = "4.1.4", features = ["derive", "env"] }
+configparser = { version = "3.0.2", features = ["indexmap"] }
+crossterm = { version = "0.25.0", features = ["event-stream"] }
+derivative = "2.2.0"
+futures = "0.3.26"
+gtmpl = "0.7.1"
+log = "0.4.17"
+simple_logger = { version = "4.0.0", default-features = false, features = ["time", "timestamps"] }
+time = "0.3.17"
+tokio = { version = "1.25.0", features = ["full"] }
+tui = "0.19.0"
+
+[profile.release]
+lto = true
+codegen-units = 1
+strip = true
+debug-assertions = false
diff --git a/src/app/mod.rs b/src/app/mod.rs
new file mode 100644
index 00000000..27846065
--- /dev/null
+++ b/src/app/mod.rs
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+use std::collections::HashMap;
+use std::sync::Arc;
+
+use tokio::sync::mpsc::channel;
+use tokio::sync::mpsc::Receiver;
+use tokio::sync::mpsc::Sender;
+use tokio::sync::Mutex;
+use tokio::task::JoinHandle;
+
+use crate::config::AccountConfig;
+use crate::config::Config;
+use crate::worker::Worker;
+use crate::worker::WorkerMessage;
+
+pub struct App {
+    config: Arc<Mutex<Config>>,
+    worker_tasks: Vec<JoinHandle<()>>,
+    to_workers: HashMap<String, Sender<WorkerMessage>>,
+    from_workers: HashMap<String, Receiver<WorkerMessage>>,
+    // app internal state change notifications for UI
+    updates: Sender<()>,
+}
+
+impl App {
+    pub fn new(config: Arc<Mutex<Config>>, updates: Sender<()>) -> Self {
+        App {
+            config,
+            updates,
+            worker_tasks: Vec::new(),
+            to_workers: HashMap::new(),
+            from_workers: HashMap::new(),
+        }
+    }
+
+    pub fn invalidate(&self) {
+        // ignore if a pending tick is already present in the channel
+        let _ = self.updates.try_send(());
+    }
+
+    pub fn start_worker(&mut self, config: AccountConfig) {
+        let (from_worker_tx, from_worker_rx) = channel::<WorkerMessage>(32);
+        let (to_worker_tx, to_worker_rx) = channel::<WorkerMessage>(32);
+
+        self.to_workers.insert(config.name.clone(), to_worker_tx);
+        self.from_workers
+            .insert(config.name.clone(), from_worker_rx);
+
+        let handle = tokio::spawn(async move {
+            let worker = Worker::new(config, to_worker_rx, from_worker_tx);
+            let run = worker.run();
+            tokio::pin!(run);
+            run.await;
+        });
+        self.worker_tasks.push(handle);
+    }
+
+    pub async fn stop_workers(&self) {}
+}
diff --git a/src/cmd/mod.rs b/src/cmd/mod.rs
new file mode 100644
index 00000000..f596ebb2
--- /dev/null
+++ b/src/cmd/mod.rs
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+pub trait Command {}
diff --git a/src/config/accounts.rs b/src/config/accounts.rs
new file mode 100644
index 00000000..91bc612a
--- /dev/null
+++ b/src/config/accounts.rs
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+#[derive(Debug, Default, Clone)]
+pub struct AccountConfig {
+    pub name: String,
+    pub backend: BackendType,
+}
+
+#[derive(Debug, Default, Clone)]
+pub enum BackendType {
+    #[default]
+    IMAP,
+    Maildir,
+    Mbox,
+    Notmuch,
+}
diff --git a/src/config/columns.rs b/src/config/columns.rs
new file mode 100644
index 00000000..45b90f4c
--- /dev/null
+++ b/src/config/columns.rs
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+use bitflags::bitflags;
+use derivative::Derivative;
+use gtmpl::Template;
+
+#[derive(Derivative)]
+#[derivative(Debug, Default)]
+pub struct ColumnDef {
+    pub name: String,
+    pub flags: ColumnFlags,
+    pub width: f64,
+    #[derivative(Debug(format_with = "crate::config::templates::debug_template"))]
+    pub template: Template,
+}
+
+bitflags! {
+    #[derive(Default)]
+    pub struct ColumnFlags: u8 {
+        const ALIGN_LEFT = 1 << 0;
+        const ALIGN_CENTER = 1 << 1;
+        const ALIGN_RIGHT = 1 << 2 ;
+        const WIDTH_AUTO = 1 << 3 ; // whatever is left
+        const WIDTH_FRACTION = 1 << 4; // ratio of total width
+        const WIDTH_EXACT = 1 << 5; // exact number of characters
+        const WIDTH_FIT = 1 << 6; // fit to column content width
+    }
+}
diff --git a/src/config/mod.rs b/src/config/mod.rs
new file mode 100644
index 00000000..5709180a
--- /dev/null
+++ b/src/config/mod.rs
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+mod accounts;
+mod columns;
+mod style;
+mod templates;
+mod ui;
+
+use std::collections::HashMap;
+
+use anyhow::Result;
+use derivative::Derivative;
+
+pub use crate::config::accounts::AccountConfig;
+pub use crate::config::accounts::BackendType;
+pub use crate::config::ui::UiConfig;
+
+#[derive(Derivative)]
+#[derivative(Debug, Default)]
+pub struct Config {
+    pub ui: UiConfig,
+    pub accounts: HashMap<String, AccountConfig>,
+}
+
+impl Config {
+    pub fn parse(accounts: Vec<String>) -> Result<Self> {
+        let c = Self::default();
+        Ok(c)
+    }
+}
diff --git a/src/config/style.rs b/src/config/style.rs
new file mode 100644
index 00000000..357112ba
--- /dev/null
+++ b/src/config/style.rs
@@ -0,0 +1,5 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+#[derive(Debug, Default)]
+pub struct StyleSet {}
diff --git a/src/config/templates.rs b/src/config/templates.rs
new file mode 100644
index 00000000..00e9cf59
--- /dev/null
+++ b/src/config/templates.rs
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+use std::fmt;
+
+use gtmpl::Template;
+
+pub fn debug_template(t: &Template, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
+    f.write_fmt(format_args!("Template({:?})", t.text))
+}
diff --git a/src/config/ui.rs b/src/config/ui.rs
new file mode 100644
index 00000000..b7b004e2
--- /dev/null
+++ b/src/config/ui.rs
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+use std::collections::HashMap;
+
+use derivative::Derivative;
+use gtmpl::Template;
+
+use crate::config::columns::ColumnDef;
+use crate::config::style::StyleSet;
+
+#[derive(Derivative)]
+#[derivative(Debug, Default)]
+pub struct UiConfig {
+    // message list
+    pub index_columns: Vec<ColumnDef>,
+    pub column_separator: String,
+    pub empty_message: String,
+    pub threading_enabled: bool,
+    pub force_client_threads: bool,
+    pub client_threads_delay: time::Duration,
+    pub sort: Vec<String>,
+    pub reverse_order: bool,
+    pub reverse_thread_order: bool,
+    pub sort_thread_siblings: bool,
+
+    // dirlist
+    #[derivative(Debug(format_with = "crate::config::templates::debug_template"))]
+    pub dirlist_left: Template,
+    #[derivative(Debug(format_with = "crate::config::templates::debug_template"))]
+    pub dirlist_right: Template,
+    pub sidebar_width: u8,
+    pub empty_dirlist: String,
+    pub dirlist_delay: time::Duration,
+    pub dirlist_tree: bool,
+    pub dirlist_collapse: u8,
+
+    // time formats
+    pub timestamp_format: String,
+    pub this_day_time_format: String,
+    pub this_week_time_format: String,
+    pub this_year_time_format: String,
+    pub msgview_timestamp_format: String,
+    pub msgview_this_day_time_format: String,
+    pub msgview_this_week_time_format: String,
+    pub msgview_this_year_time_format: String,
+
+    // icons
+    pub icon_unencrypted: String,
+    pub icon_encrypted: String,
+    pub icon_signed: String,
+    pub icon_signed_encrypted: String,
+    pub icon_unknown: String,
+    pub icon_invalid: String,
+    pub icon_attachment: String,
+
+    // style
+    pub stylesets_dirs: Vec<String>,
+    pub styleset_name: String,
+    style: StyleSet,
+
+    // general appearance
+    pub border_vertical: char,
+    pub border_horizontal: char,
+    pub spinner: String,
+    pub spinner_delimiter: String,
+    pub spinner_interval: time::Duration,
+    pub pinned_tab_marker: String,
+
+    // behaviour
+    pub automark_read: bool,
+    pub next_message_on_delete: bool,
+    pub mouse_enabled: bool,
+    pub fuzzy_complete: bool,
+    pub new_message_bell: bool,
+    pub completion_delay: time::Duration,
+    pub completion_min_chars: u8,
+    pub completion_popovers: bool,
+
+    // tabs
+    #[derivative(Debug(format_with = "crate::config::templates::debug_template"))]
+    pub tab_title_account: Template,
+    #[derivative(Debug(format_with = "crate::config::templates::debug_template"))]
+    pub tab_title_composer: Template,
+
+    // contextual
+    contextual_sections: Vec<UiContext>,
+    contextual_counts: HashMap<UiContextType, usize>,
+    contextual_cache: HashMap<UiContextKey, UiConfig>,
+}
+
+#[derive(Debug)]
+struct UiContext {}
+
+#[derive(Debug)]
+enum UiContextType {}
+
+#[derive(Debug)]
+struct UiContextKey {}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 00000000..894b8853
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,142 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+mod app;
+mod cmd;
+mod config;
+mod worker;
+
+use std::io;
+use std::panic;
+use std::sync::Arc;
+
+use anyhow::Result;
+use clap::Parser;
+use crossterm::cursor;
+use crossterm::event::DisableMouseCapture;
+use crossterm::event::EnableMouseCapture;
+use crossterm::event::Event;
+use crossterm::event::EventStream;
+use crossterm::event::KeyCode;
+use crossterm::event::KeyEventKind;
+use crossterm::terminal::disable_raw_mode;
+use crossterm::terminal::enable_raw_mode;
+use crossterm::terminal::EnterAlternateScreen;
+use crossterm::terminal::LeaveAlternateScreen;
+use crossterm::terminal::SetTitle;
+use crossterm::ExecutableCommand;
+use futures::future::FutureExt;
+use futures::StreamExt;
+use tokio::sync::mpsc::channel;
+use tokio::sync::mpsc::Receiver;
+use tokio::sync::Mutex;
+use tui::backend::Backend;
+use tui::backend::CrosstermBackend;
+use tui::Terminal;
+
+use crate::app::App;
+use crate::config::Config;
+
+/// A pretty good email client
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about = None)]
+struct Args {
+    /// Enabled account (by default, all accounts are enabled).
+    #[arg(short, long = "account", env = "AERC_ACCOUNTS")]
+    accounts: Vec<String>,
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    let default_hook = panic::take_hook();
+    panic::set_hook(Box::new(move |info| {
+        restore_term().unwrap();
+        default_hook(info);
+    }));
+
+    // Parse command line arguments and configuration files.
+    let args = Args::parse();
+    let config = Arc::new(Mutex::new(Config::parse(args.accounts)?));
+    let (updates_tx, updates_rx) = channel(1);
+    let app = Arc::new(Mutex::new(App::new(config.clone(), updates_tx)));
+
+    // Start email handling workers in the background.
+    for account in config.lock().await.accounts.values() {
+        app.lock().await.start_worker(account.clone());
+    }
+
+    // The UI must run in the "main" thread.
+    ui_loop(config, app.clone(), updates_rx).await?;
+
+    app.lock().await.stop_workers().await;
+
+    restore_term()?;
+
+    Ok(())
+}
+
+async fn ui_loop(
+    config: Arc<Mutex<Config>>,
+    app: Arc<Mutex<App>>,
+    mut app_updates: Receiver<()>,
+) -> Result<()> {
+    // Terminal initialization.
+    enable_raw_mode()?;
+
+    let mut backend = CrosstermBackend::new(io::stdout());
+
+    backend.execute(EnterAlternateScreen)?;
+    if config.lock().await.ui.mouse_enabled {
+        backend.execute(EnableMouseCapture)?;
+    }
+    backend.hide_cursor()?;
+    backend.execute(SetTitle("aerc"))?;
+
+    let terminal = Terminal::new(backend)?;
+
+    let mut term_events = EventStream::new();
+
+    loop {
+        // TODO: draw ui here
+        tokio::select!(
+            t = app_updates.recv() => match t {
+                Some(_) => (),
+                None => break,
+            },
+            e = term_events.next().fuse() => match e {
+                Some(Ok(event)) => match event {
+                    Event::Key(key) => {
+                        if key.kind == KeyEventKind::Press {
+                            println!("key {:?}\r", key);
+                            if key.code == KeyCode::Esc {
+                                break;
+                            }
+                        }
+                    }
+                    Event::Mouse(mouse) => {
+                        println!("mouse {:?}\r", mouse);
+                    }
+                    Event::Paste(buf) => {
+                        println!("paste {:?}\r", buf);
+                    }
+                    _ => ()
+                }
+                Some(Err(e)) => println!("Error: {:?}\r", e),
+                None => break,
+            }
+        );
+    }
+
+    Ok(())
+}
+
+fn restore_term() -> Result<()> {
+    crossterm::execute!(
+        io::stdout(),
+        LeaveAlternateScreen,
+        DisableMouseCapture,
+        cursor::Show
+    )?;
+    disable_raw_mode()?;
+    Ok(())
+}
diff --git a/src/worker/imap/mod.rs b/src/worker/imap/mod.rs
new file mode 100644
index 00000000..07aaf7d1
--- /dev/null
+++ b/src/worker/imap/mod.rs
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+use crate::worker::Backend;
+
+pub struct IMAPBackend {}
+
+pub fn new() -> IMAPBackend {
+    IMAPBackend {}
+}
+
+impl Backend for IMAPBackend {}
diff --git a/src/worker/maildir/mod.rs b/src/worker/maildir/mod.rs
new file mode 100644
index 00000000..c4e7eb9a
--- /dev/null
+++ b/src/worker/maildir/mod.rs
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+use crate::worker::Backend;
+
+pub struct MaildirBackend {}
+
+pub fn new() -> MaildirBackend {
+    MaildirBackend {}
+}
+
+impl Backend for MaildirBackend {}
diff --git a/src/worker/mbox/mod.rs b/src/worker/mbox/mod.rs
new file mode 100644
index 00000000..c4453c5f
--- /dev/null
+++ b/src/worker/mbox/mod.rs
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+use crate::worker::Backend;
+
+pub struct MboxBackend {}
+
+pub fn new() -> MboxBackend {
+    MboxBackend {}
+}
+
+impl Backend for MboxBackend {}
diff --git a/src/worker/mod.rs b/src/worker/mod.rs
new file mode 100644
index 00000000..760ed82f
--- /dev/null
+++ b/src/worker/mod.rs
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+mod imap;
+mod maildir;
+mod mbox;
+mod notmuch;
+
+use tokio::sync::mpsc::Receiver;
+use tokio::sync::mpsc::Sender;
+
+use crate::config::AccountConfig;
+use crate::config::BackendType;
+
+pub struct Worker {
+    config: AccountConfig,
+    backend: Box<dyn Backend>,
+    from_app: Receiver<WorkerMessage>,
+    to_app: Sender<WorkerMessage>,
+}
+
+impl Worker {
+    pub fn new(
+        config: AccountConfig,
+        from_app: Receiver<WorkerMessage>,
+        to_app: Sender<WorkerMessage>,
+    ) -> Self {
+        let backend: Box<dyn Backend> = match config.backend {
+            BackendType::IMAP => Box::new(imap::new()),
+            BackendType::Maildir => Box::new(maildir::new()),
+            BackendType::Mbox => Box::new(mbox::new()),
+            BackendType::Notmuch => Box::new(notmuch::new()),
+        };
+        Worker {
+            config,
+            backend,
+            from_app,
+            to_app,
+        }
+    }
+
+    pub async fn run(self) {}
+}
+
+pub trait Backend: Send + Sync {}
+pub struct WorkerMessage {}
diff --git a/src/worker/notmuch/mod.rs b/src/worker/notmuch/mod.rs
new file mode 100644
index 00000000..1cc39a9c
--- /dev/null
+++ b/src/worker/notmuch/mod.rs
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 Robin Jarry
+
+use crate::worker::Backend;
+
+pub struct NotmuchBackend {}
+
+pub fn new() -> NotmuchBackend {
+    NotmuchBackend {}
+}
+
+impl Backend for NotmuchBackend {}