Separate red_knot into CLI and red_knot_workspace crates (#12623)

## Summary

This PR separates the current `red_knot` crate into two crates:
1. `red_knot` - This will be similar to the `ruff` crate, it'll act as
the CLI crate
2. `red_knot_workspace` - This includes everything except for the CLI
functionality from the existing `red_knot` crate

Note that the code related to the file watcher is in
`red_knot_workspace` for now but might be required to extract it out in
the future.

The main motivation for this change is so that we can have a `red_knot
server` command. This makes it easier to test the server out without
making any changes in the VS Code extension. All we need is to specify
the `red_knot` executable path in `ruff.path` extension setting.

## Test Plan

- `cargo build`
- `cargo clippy --workspace --all-targets --all-features`
- `cargo shear --fix`

crates/red_knot/Cargo.toml

@@ -13,19 +13,16 @@ license.workspace = true
 
 [dependencies]
 red_knot_module_resolver = { workspace = true }
-red_knot_python_semantic = { workspace = true }
+red_knot_workspace = { workspace = true }
 
 ruff_db = { workspace = true, features = ["os", "cache"] }
-ruff_python_ast = { workspace = true }
 
 anyhow = { workspace = true }
 clap = { workspace = true, features = ["wrap_help"] }
 countme = { workspace = true, features = ["enable"] }
 crossbeam = { workspace = true }
 ctrlc = { version = "3.4.4" }
-notify = { workspace = true }
 rayon = { workspace = true }
-rustc-hash = { workspace = true }
 salsa = { workspace = true }
 tracing = { workspace = true }
 tracing-subscriber = { workspace = true }

crates/red_knot/src/main.rs

@@ -9,10 +9,10 @@ use tracing_subscriber::layer::{Context, Filter, SubscriberExt};
 use tracing_subscriber::{Layer, Registry};
 use tracing_tree::time::Uptime;
 
-use red_knot::db::RootDatabase;
-use red_knot::watch;
-use red_knot::watch::WorkspaceWatcher;
-use red_knot::workspace::WorkspaceMetadata;
+use red_knot_workspace::db::RootDatabase;
+use red_knot_workspace::watch;
+use red_knot_workspace::watch::WorkspaceWatcher;
+use red_knot_workspace::workspace::WorkspaceMetadata;
 use ruff_db::program::{ProgramSettings, SearchPathSettings};
 use ruff_db::system::{OsSystem, System, SystemPathBuf};
 

crates/red_knot/tests/file_watching.rs

@@ -6,11 +6,11 @@ use std::time::Duration;
 use anyhow::{anyhow, Context};
 use salsa::Setter;
 
-use red_knot::db::RootDatabase;
-use red_knot::watch;
-use red_knot::watch::{directory_watcher, WorkspaceWatcher};
-use red_knot::workspace::WorkspaceMetadata;
 use red_knot_module_resolver::{resolve_module, ModuleName};
+use red_knot_workspace::db::RootDatabase;
+use red_knot_workspace::watch;
+use red_knot_workspace::watch::{directory_watcher, WorkspaceWatcher};
+use red_knot_workspace::workspace::WorkspaceMetadata;
 use ruff_db::files::{system_path_to_file, File, FileError};
 use ruff_db::program::{Program, ProgramSettings, SearchPathSettings, TargetVersion};
 use ruff_db::source::source_text;

crates/red_knot_workspace/Cargo.toml

@@ -0,0 +1,31 @@
+[package]
+name = "red_knot_workspace"
+version = "0.0.0"
+edition.workspace = true
+rust-version.workspace = true
+homepage.workspace = true
+documentation.workspace = true
+repository.workspace = true
+authors.workspace = true
+license.workspace = true
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+red_knot_module_resolver = { workspace = true }
+red_knot_python_semantic = { workspace = true }
+
+ruff_db = { workspace = true, features = ["os", "cache"] }
+ruff_python_ast = { workspace = true }
+
+anyhow = { workspace = true }
+crossbeam = { workspace = true }
+notify = { workspace = true }
+rustc-hash = { workspace = true }
+salsa = { workspace = true }
+tracing = { workspace = true }
+
+[dev-dependencies]
+
+[lints]
+workspace = true