restructure the config parsing so it can look for reloads

Cargo.lock

@@ -784,6 +784,7 @@ dependencies = [
  "structopt",
  "tokio",
  "tokio-rustls",
+ "tokio-stream",
  "tokio-util",
  "toml",
  "webpki-roots",
@@ -1302,6 +1303,18 @@ dependencies = [
  "webpki",
 ]
 
+[[package]]
+name = "tokio-stream"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1981ad97df782ab506a1f43bf82c967326960d278acf3bf8279809648c3ff3ea"
+dependencies = [
+ "futures-core",
+ "pin-project-lite",
+ "tokio",
+ "tokio-util",
+]
+
 [[package]]
 name = "tokio-util"
 version = "0.6.3"

Cargo.toml

@@ -19,18 +19,18 @@ chrono = "0.4.19"
 crossterm = "0.19.0"
 fern = "0.6.0"
 futures = "0.3.12"
+imap = { path = "imap" }
 lettre = "0.9.5"
 log = "0.4.14"
 notify = "4.0.15"
 pin-project = "1.0.4"
 rustls-connector = "0.13.1"
-tokio = { version = "1.1.1", features = ["full"] }
-tokio-rustls = "0.22.0"
-tokio-util = { version = "0.6.3", features = ["full"] }
-webpki-roots = "0.21.0"
-xdg = "2.2.0"
-
-imap = { path = "imap" }
-toml = "0.5.8"
 serde = { version = "1.0.123", features = ["derive"] }
 structopt = "0.3.21"
+tokio = { version = "1.1.1", features = ["full"] }
+tokio-rustls = "0.22.0"
+tokio-stream = { version = "0.1.3", features = ["sync"] }
+tokio-util = { version = "0.6.3", features = ["full"] }
+toml = "0.5.8"
+webpki-roots = "0.21.0"
+xdg = "2.2.0"

README.md

@@ -5,11 +5,11 @@ Panorama is a terminal Personal Information Manager (PIM).
 
 Goals:
 
+- Never have to actually close the application.
 - Handles email, calendar, and address books using open standards.
 - Unified "feed" that any app can submit to.
 - Hot-reload on-disk config.
 - Submit notifications to gotify-shaped notification servers.
-- Never have to actually close the application.
 
 Credits
 -------

src/config.rs

@@ -1,8 +1,84 @@
-#[derive(Serialize, Deserialize, Clone, Debug)]
-pub struct Config {
+use std::fs::File;
+use std::sync::mpsc::{self, Receiver};
+use std::time::Duration;
+use std::io::Read;
+use std::path::Path;
+
+use anyhow::{Result, Context};
+use notify::{DebouncedEvent, RecommendedWatcher, RecursiveMode, Watcher};
+use tokio::sync::watch;
+use xdg::BaseDirectories;
+
+pub type ConfigWatcher = watch::Receiver<Option<MailConfig>>;
+
+#[derive(Default, Serialize, Deserialize, Clone, Debug)]
+pub struct MailConfig {
     pub server: String,
     pub port: u16,
 
     pub username: String,
     pub password: String,
 }
+
+/// Spawns a notify::RecommendedWatcher to watch the XDG config directory. Whenever the config file
+/// is updated, the config file is parsed and sent to the receiver.
+fn start_watcher() -> Result<(
+    RecommendedWatcher,
+    Receiver<DebouncedEvent>,
+)> {
+    let (tx, rx) = mpsc::channel();
+    let mut watcher = RecommendedWatcher::new(tx, Duration::from_secs(5))?;
+
+    let xdg = BaseDirectories::new()?;
+    let config_home = xdg.get_config_home();
+    debug!("config_home: {:?}", config_home);
+    watcher.watch(config_home.join("panorama"), RecursiveMode::Recursive).context("could not watch config_home")?;
+
+    Ok((watcher, rx))
+}
+
+async fn read_config(path: impl AsRef<Path>) -> Result<MailConfig> {
+    let mut file = File::open(path.as_ref())?;
+    let mut contents = Vec::new();
+    file.read_to_end(&mut contents)?;
+
+    let config = toml::from_slice(&contents)?;
+    Ok(config)
+}
+
+async fn watcher_loop(
+    fs_events: Receiver<DebouncedEvent>,
+    config_tx: watch::Sender<Option<MailConfig>>,
+) -> Result<()> {
+    // first try opening the config file directly on load
+    // (so the config isn't blank until the user touches the config file)
+    let xdg = BaseDirectories::new()?;
+    if let Some(config_path) = xdg.find_config_file("panorama/panorama.toml") {
+        debug!("found config at {:?}", config_path);
+        let config = read_config(config_path).await?;
+        config_tx.send(Some(config))?;
+    }
+
+    for event in fs_events {
+        debug!("new event: {:?}", event);
+        // config_tx.send(Some(config))?;
+    }
+
+    Ok(())
+}
+
+pub fn spawn_config_watcher() -> Result<ConfigWatcher> {
+    let (_watcher, config_rx) = start_watcher()?;
+    let (config_tx, config_update) = watch::channel(None);
+
+    tokio::spawn(async move {
+        match watcher_loop(config_rx, config_tx).await {
+            Ok(_) => {}
+            Err(err) => {
+                debug!("config watcher died: {:?}", err);
+            }
+        }
+    });
+
+    Ok(config_update)
+}

src/mail.rs

@@ -19,16 +19,42 @@ use tokio::{
     sync::mpsc::{self, UnboundedReceiver},
 };
 use tokio_rustls::{rustls::ClientConfig, webpki::DNSNameRef, TlsConnector};
+use tokio_stream::wrappers::WatchStream;
 use tokio_util::codec::{Decoder, LinesCodec, LinesCodecError};
 
-use crate::config::Config;
+use crate::config::{MailConfig, ConfigWatcher};
 
 pub enum MailCommand {
     Refresh,
     Raw(Command),
 }
 
-pub async fn run_mail(config: Config, cmd_in: UnboundedReceiver<MailCommand>) -> Result<()> {
+/// Main entrypoint for the mail listener.
+pub async fn run_mail(
+    config_watcher: ConfigWatcher,
+    cmd_in: UnboundedReceiver<MailCommand>,
+) -> Result<()> {
+    let mut curr_conn = None;
+
+    let mut config_watcher = WatchStream::new(config_watcher);
+    loop {
+        let config: MailConfig = match config_watcher.next().await {
+            Some(Some(v)) => v,
+            _ => break,
+        };
+
+        let handle = tokio::spawn(open_imap_connection(config));
+        curr_conn = Some(handle);
+    }
+
+    Ok(())
+}
+
+async fn open_imap_connection(config: MailConfig) -> Result<()> {
+    debug!(
+        "Opening imap connection to {}:{}",
+        config.server, config.port
+    );
     let server = config.server.as_str();
     let port = config.port;
 
@@ -62,13 +88,16 @@ pub async fn run_mail(config: Config, cmd_in: UnboundedReceiver<MailCommand>) ->
     Ok(())
 }
 
+/// Action that should be taken after the connection loop quits.
 enum LoopExit<S, S2> {
+    /// Used in case the STARTTLS command is issued; perform TLS negotiation on top of the current
+    /// stream
     NegotiateTls(S, S2),
     Closed,
 }
 
 async fn listen_loop<S, S2>(
-    config: Config,
+    config: MailConfig,
     st: &mut State,
     sink: S2,
     mut stream: S,

src/main.rs

@@ -19,8 +19,9 @@ use anyhow::Result;
 use futures::future::TryFutureExt;
 use structopt::StructOpt;
 use tokio::sync::{mpsc, oneshot};
+use xdg::BaseDirectories;
 
-use crate::config::Config;
+use crate::config::{spawn_config_watcher, MailConfig};
 
 type ExitSender = oneshot::Sender<()>;
 
@@ -38,26 +39,35 @@ struct Opt {
 
 #[tokio::main]
 async fn main() -> Result<()> {
+    // parse command line arguments into options struct
     let opt = Opt::from_args();
 
+    // print logs to file as directed by command line options
     setup_logger(&opt)?;
 
-    let config: Config = {
-        let config_path = opt
-            .config_path
-            .clone()
-            .unwrap_or_else(|| "config.toml".into());
-        let mut config_file = File::open(config_path)?;
-        let mut contents = Vec::new();
-        config_file.read_to_end(&mut contents)?;
-        toml::from_slice(&contents)?
-    };
+    let xdg = BaseDirectories::new()?;
+    let config_update = spawn_config_watcher()?;
 
+    let config = MailConfig::default();
+    // let config: MailConfig = {
+    //     let config_path = opt
+    //         .config_path
+    //         .clone()
+    //         .unwrap_or_else(|| "config.toml".into());
+    //     let mut config_file = File::open(config_path)?;
+    //     let mut contents = Vec::new();
+    //     config_file.read_to_end(&mut contents)?;
+    //     toml::from_slice(&contents)?
+    // };
+
+    // used to notify the runtime that the process should exit
     let (exit_tx, exit_rx) = oneshot::channel::<()>();
+
+    // used to send commands to the mail service
     let (mail_tx, mail_rx) = mpsc::unbounded_channel();
 
-    tokio::spawn(mail::run_mail(config.clone(), mail_rx).unwrap_or_else(report_err));
-    let mut stdout = std::io::stdout();
+    tokio::spawn(mail::run_mail(config_update.clone(), mail_rx).unwrap_or_else(report_err));
+    let stdout = std::io::stdout();
     tokio::spawn(ui::run_ui(stdout, exit_tx).unwrap_or_else(report_err));
 
     exit_rx.await?;

src/ui/mod.rs

@@ -17,7 +17,7 @@ use crate::ExitSender;
 
 use self::table::Table;
 
-const FRAME: Duration = Duration::from_millis(16);
+const FRAME: Duration = Duration::from_millis(20);
 
 /// X Y W H
 #[derive(Copy, Clone)]
@@ -51,6 +51,7 @@ pub async fn run_ui(mut w: impl Write, exit: ExitSender) -> Result<()> {
         // approx 60fps
         time::sleep(FRAME).await;
 
+        // check to see if there's even an event this frame. otherwise, just keep going
         if event::poll(FRAME)? {
             let event = event::read()?;
             table.update(&event);

src/ui/table.rs

@@ -82,6 +82,17 @@ impl Table {
                 }
                 println!("{}", s);
             }
+
+            let d = "\u{b7}".repeat(rect.2 as usize);
+            queue!(
+                w,
+                style::SetBackgroundColor(Color::Black),
+                style::SetForegroundColor(Color::White)
+            )?;
+            for j in self.rows.len() as u16..rect.3 {
+                queue!(w, cursor::MoveTo(rect.0, rect.1 + j))?;
+                println!("{}", d);
+            }
         } else {
             let msg = "Nothing in this table!";
             let x = rect.0 + (rect.2 - msg.len() as u16) / 2;

src/ui/tabs.rs

@@ -0,0 +1,3 @@
+pub struct Tabs {
+
+}