Add a toggleable integrated terminal

This commit adds the `helix-integrated-terminal` crate, which
handles the PTY creation and view logic for an integrated
terminal in Helix, using the `alacritty_terminal` crate.

The terminal can be opened using the `:term` command, and the
terminal can be exited by either using `exit` in the terminal
itself, or by using `C-q` twice.

The current implementation is as a pop-up, but in the future,
we may be able to expose the terminal as a `View`, if work is
done to decouple the `Document` attachment to `View`.

Signed-off-by: Ryan Brue <[email protected]>

Author: ryanabx

Cargo.lock

@@ -4,6 +4,7 @@ members = [
   "helix-core",
   "helix-graphics",
   "helix-input",
+  "helix-integrated-terminal",
   "helix-view",
   "helix-term",
   "helix-tui",

Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "helix-integrated-terminal"
+description = "An integrated terminal for Helix, using alacritty_terminal."
+version.workspace = true
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+rust-version.workspace = true
+categories.workspace = true
+repository.workspace = true
+homepage.workspace = true
+
+[dependencies]
+helix-input = { path = "../helix-input" }
+helix-graphics = { path = "../helix-graphics" }
+helix-lsp = { path = "../helix-lsp" }
+
+futures = "0.3"
+thiserror.workspace = true
+tokio = { version = "1", features = ["rt", "rt-multi-thread", "io-util", "io-std", "time", "process", "macros", "fs", "parking_lot"] }
+anyhow = "1"
+log = "~0.4"
+alacritty_terminal = "0.25.1"
+polling = "3.11.0"
+
+[target.'cfg(target_os = "linux")'.dependencies]
+libc = "0.2.177"

helix-integrated-terminal/Cargo.toml

@@ -0,0 +1,14 @@
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("Pty Error: {0}")]
+    PtyError(#[from] anyhow::Error),
+
+    #[error("IO Error: {0}")]
+    IoError(#[from] std::io::Error),
+
+    #[error("Terminal Not Found: {0}")]
+    TerminalNotFound(u32),
+
+    #[error("MPSC Sender error: {0}")]
+    SendError(#[from] tokio::sync::mpsc::error::SendError<alacritty_terminal::event_loop::Msg>),
+}

helix-integrated-terminal/src/error.rs

@@ -0,0 +1,3 @@
+pub mod error;
+pub mod pty;
+pub mod terminal;