commit f022b6ac192008719c0073abcc7350d4d6d86186
Author: Audrey Dutcher <audrey@rhelmot.io>
Date:   Thu Aug 28 18:43:17 2025 -0700

    initial commit

diff --git a/.gitignore b/.gitignore
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+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
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+ "quote",
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..1b49d11
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "shelld"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+
+hyper = { version = "1", features = ["full"] }
+tokio = { version = "1", features = ["full"] }
+http-body-util = "0.1"
+hyper-util = { version = "0.1", features = ["full"] }
+futures-util = { version = "0.3", default-features = false }
+hyper-tungstenite = "0.18.0"
+futures = "0.3.31"
+thiserror = "2.0.16"
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..6558f37
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,92 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 0,
+        "narHash": "sha256-AyhxamGqcbKhYjeHN/5R0X10i16vJWno2HqDSoKwa6g=",
+        "path": "/nix/store/mjia8vb4zrv7d00z45k9w1n4aq66xy7v-source",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1744536153,
+        "narHash": "sha256-awS2zRgF4uTwrOKwwiJcByDzDOdo3Q1rPZbiHQg/N38=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "18dd725c29603f582cf1900e0d25f9f1063dbf11",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay",
+        "utils": "utils"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1756175826,
+        "narHash": "sha256-cQNnntKWve+vnqo6pGGXl4NFT4dgnMKXl4+bpwLELvU=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "d137b47bde8a6783b961db81254013b454eab46a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..473bd5e
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,27 @@
+{
+  inputs = {
+    nixpkgs.url = "nixpkgs";
+    utils.url = "github:numtide/flake-utils";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = { self, nixpkgs, utils, rust-overlay }:
+    utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = (import nixpkgs) {
+          inherit system overlays;
+        };
+      in {
+        devShell = with pkgs; mkShell {
+          nativeBuildInputs = [
+          # This sets up the rust suite, automatically selecting the latest nightly version
+          (rust-bin.selectLatestNightlyWith
+            (toolchain: toolchain.default.override {
+              extensions = [ "rust-src" "clippy" "rust-analyzer" ];
+            }))
+          ];
+        };
+      }
+    );
+}
diff --git a/src/j b/src/j
new file mode 100644
index 0000000..e69de29
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..616b408
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,218 @@
+use std::collections::BTreeMap;
+use std::ops::{Deref, DerefMut};
+use std::process::Child;
+use std::time::Duration;
+
+use futures::sink::SinkExt;
+use futures::stream::StreamExt;
+use http_body_util::Full;
+use hyper::body::{Bytes, Incoming};
+use hyper::{Request, Response};
+use hyper_tungstenite::{tungstenite, HyperWebsocket};
+use hyper_util::rt::TokioIo;
+use tokio::time::sleep;
+use tokio::sync::mpsc;
+use tungstenite::Message;
+
+type Error = Box<dyn std::error::Error + Send + Sync + 'static>;
+use thiserror::Error;
+
+static STATE: std::sync::OnceLock<std::sync::Mutex<BTreeMap<u64, Option<SessionState>>>> = std::sync::OnceLock::new();
+
+pub enum SessionLifecycle {
+    Prompt,
+    Execute,
+}
+
+pub struct SessionState {
+    id: u64,
+    process: Child,
+    status: SessionLifecycle,
+    cmd_channel: mpsc::Sender<String>,
+}
+
+impl SessionState {
+    pub async fn submit(&self, command: String) -> Result<(), Error> {
+        self.cmd_channel.send(command).await?;
+        Ok(())
+    }
+}
+
+pub struct SessionStateGuard(Option<SessionState>);
+
+impl Deref for SessionStateGuard {
+    type Target = SessionState;
+
+    fn deref(&self) -> &Self::Target {
+        return self.0.as_ref().unwrap()
+    }
+}
+
+impl DerefMut for SessionStateGuard {
+    fn deref_mut(&mut self) -> &mut Self::Target {
+        return self.0.as_mut().unwrap()
+    }
+}
+
+impl Drop for SessionStateGuard {
+    fn drop(&mut self) {
+        if let Some(state) = self.0.take() {
+            STATE.get_or_init(|| std::sync::Mutex::new(BTreeMap::new())).lock().unwrap().insert(state.id, Some(state));
+        }
+    }
+}
+
+//impl AsyncDrop for SessionStateGuard {
+//    async fn drop(mut self: std::pin::Pin<&mut Self>) {
+//        if let Some(state) = self.0.take() {
+//            let mut map_guard = STATE.get_or_init(async || Arc::new(Mutex::new(BTreeMap::new()))).await.lock().await;
+//            map_guard.insert(state.id, Some(state));
+//        }
+//    }
+//}
+
+#[derive(Error, Debug)]
+pub enum SessionStateLookupError {
+    #[error("No such session")]
+    Missing,
+    #[error("Session is busy")]
+    Busy,
+}
+
+#[derive(Error, Debug)]
+pub enum CommandSubmitError {
+    #[error("No such session")]
+    BadSession,
+}
+
+pub fn session_state_oneshot(session_id: u64) -> Result<SessionStateGuard, SessionStateLookupError> {
+    let mut locked = STATE.get_or_init(|| std::sync::Mutex::new(BTreeMap::new())).lock().unwrap();
+    let Some(state) = locked.get_mut(&session_id) else {
+        return Err(SessionStateLookupError::Missing);
+    };
+    let Some(result) = state.take() else {
+        return Err(SessionStateLookupError::Busy);
+    };
+    Ok(SessionStateGuard(Some(result)))
+}
+
+pub async fn session_state(session_id: u64) -> Option<SessionStateGuard> {
+    loop {
+        match session_state_oneshot(session_id) {
+            Ok(state) => break Some(state),
+            Err(SessionStateLookupError::Busy) => sleep(Duration::from_millis(5)).await,
+            Err(SessionStateLookupError::Missing) => break None,
+        }
+    }
+}
+
+async fn submit_command(session_id: u64, command: String) -> Result<(), Error> {
+    session_state(session_id).await
+        .ok_or(CommandSubmitError::BadSession)?
+        .submit(command).await?;
+    Ok(())
+}
+
+async fn handle_request(mut request: Request<Incoming>) -> Result<Response<Full<Bytes>>, Error> {
+    let headers = request.headers();
+    let session_id = headers.get("Session")
+        .and_then(|session| session.to_str().ok())
+        .and_then(|session| session.parse::<u64>().ok());
+
+    let command = headers.get("Command")
+        .map(|s| s.as_bytes())
+        .and_then(|s| String::from_utf8(s.to_vec()).ok());
+
+    match request.uri().path() {
+        "/list" => {
+            todo!()
+        },
+        "/new" => {
+            todo!()
+        },
+        "/prompt" => {
+            todo!()
+        },
+        "/complete" => {
+            todo!()
+        },
+        "/run" | "/attach" => {
+            let Some(session_id) = session_id else {
+                return Ok(Response::builder().status(404).body(Full::<Bytes>::from("No session"))?);
+            };
+            if request.uri().path() == "/run" {
+                let command = command.unwrap_or("".to_string());
+                submit_command(session_id, command).await?;
+            }
+
+            if hyper_tungstenite::is_upgrade_request(&request) {
+                let (response, websocket) = hyper_tungstenite::upgrade(&mut request, None)?;
+
+                // Spawn a task to handle the websocket connection.
+                tokio::spawn(async move {
+                    if let Err(e) = serve_websocket(websocket).await {
+                        eprintln!("Error in websocket connection: {e}");
+                    }
+                });
+
+                Ok(response)
+            } else {
+                Ok(Response::new(Full::<Bytes>::from("Ok")))
+            }
+        },
+        "/close" => {
+            todo!()
+        },
+        _ => {
+            Ok(Response::builder().status(404).body(Full::<Bytes>::from("Not found"))?)
+        },
+    }
+
+}
+
+/// Handle a websocket connection.
+async fn serve_websocket(websocket: HyperWebsocket) -> Result<(), Error> {
+    let mut websocket = websocket.await?;
+    while let Some(message) = websocket.next().await {
+        match message? {
+            Message::Text(msg) => {
+                println!("Received text message: {msg}");
+                websocket.send(Message::text("Thank you, come again.")).await?;
+            },
+            Message::Binary(msg) => {
+                println!("Received binary message: {msg:02X?}");
+                websocket.send(Message::binary(b"Thank you, come again.".to_vec())).await?;
+            },
+            Message::Ping(_msg) => {},
+            Message::Pong(_msg) => {}
+            Message::Close(_msg) => {},
+            Message::Frame(_msg) => {
+                unreachable!();
+            }
+        }
+    }
+
+    Ok(())
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Error> {
+    let addr: std::net::SocketAddr = "[::1]:3000".parse()?;
+    let listener = tokio::net::TcpListener::bind(&addr).await?;
+    println!("Listening on http://{addr}");
+
+    let mut http = hyper::server::conn::http1::Builder::new();
+    http.keep_alive(true);
+
+    loop {
+        let (stream, _) = listener.accept().await?;
+        let connection = http
+            .serve_connection(TokioIo::new(stream), hyper::service::service_fn(handle_request))
+            .with_upgrades();
+        tokio::spawn(async move {
+            if let Err(err) = connection.await {
+                println!("Error serving HTTP connection: {err:?}");
+            }
+        });
+    }
+}