refactor(repl): use an inspector session (denoland#7763)

This ports the REPL over to Rust and makes use of an inspector session to run a REPL on top of any isolate which lets make full use of rustylines various things like validators and completors without having to introduce a bunch of hard to test internal ops and glue code.

An accidental but good side effect of this is that the multiple line input we previously had is now an editable multi-line input prompt that is correctly stored in the history as a single entry.

cli/Cargo.toml

@@ -57,6 +57,7 @@ rand = "0.7.3"
 regex = "1.3.9"
 ring = "0.16.15"
 rustyline = { version = "6.3.0", default-features = false }
+rustyline-derive = "0.3.1"
 serde = { version = "1.0.116", features = ["derive"] }
 sys-info = "0.7.0"
 sourcemap = "6.0.1"

cli/flags.rs

@@ -120,6 +120,7 @@ pub struct Flags {
   pub no_remote: bool,
   pub read_allowlist: Vec<PathBuf>,
   pub reload: bool,
+  pub repl: bool,
   pub seed: Option<u64>,
   pub unstable: bool,
   pub v8_flags: Option<Vec<String>>,
@@ -447,6 +448,7 @@ fn completions_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
 
 fn repl_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
   runtime_args_parse(flags, matches, false);
+  flags.repl = true;
   flags.subcommand = DenoSubcommand::Repl;
   flags.allow_net = true;
   flags.allow_env = true;
@@ -2142,6 +2144,7 @@ mod tests {
     assert_eq!(
       r.unwrap(),
       Flags {
+        repl: true,
         subcommand: DenoSubcommand::Repl,
         allow_net: true,
         allow_env: true,
@@ -2162,6 +2165,7 @@ mod tests {
     assert_eq!(
       r.unwrap(),
       Flags {
+        repl: true,
         subcommand: DenoSubcommand::Repl,
         unstable: true,
         import_map_path: Some("import_map.json".to_string()),

cli/inspector.rs

@@ -857,6 +857,7 @@ impl v8::inspector::ChannelImpl for InspectorSession {
   ) {
     let raw_message = message.unwrap().string().to_string();
     let message = serde_json::from_str(&raw_message).unwrap();
+
     self
       .response_tx_map
       .remove(&call_id)

cli/main.rs

@@ -63,6 +63,7 @@ use crate::file_fetcher::SourceFileFetcher;
 use crate::file_fetcher::TextDocument;
 use crate::fs as deno_fs;
 use crate::global_state::GlobalState;
+use crate::inspector::InspectorSession;
 use crate::media_type::MediaType;
 use crate::permissions::Permissions;
 use crate::worker::MainWorker;
@@ -428,9 +429,26 @@ async fn run_repl(flags: Flags) -> Result<(), AnyError> {
   let main_module =
     ModuleSpecifier::resolve_url_or_path("./$deno$repl.ts").unwrap();
   let global_state = GlobalState::new(flags)?;
-  let mut worker = MainWorker::new(&global_state, main_module);
+  let mut worker = MainWorker::new(&global_state, main_module.clone());
+  (&mut *worker).await?;
+
+  let inspector = worker
+    .inspector
+    .as_mut()
+    .expect("Inspector is not created.");
+
+  let inspector_session = InspectorSession::new(&mut **inspector);
+  let repl = repl::run(&global_state, inspector_session);
+
+  tokio::pin!(repl);
+
   loop {
-    (&mut *worker).await?;
+    tokio::select! {
+      result = &mut repl => {
+          return result;
+      }
+      _ = &mut *worker => {}
+    }
   }
 }
 

cli/ops/mod.rs

@@ -16,7 +16,6 @@ pub mod permissions;
 pub mod plugin;
 pub mod process;
 pub mod random;
-pub mod repl;
 pub mod runtime;
 pub mod runtime_compiler;
 pub mod signal;

cli/ops/runtime.rs

@@ -4,7 +4,6 @@ use crate::colors;
 use crate::metrics::Metrics;
 use crate::permissions::Permissions;
 use crate::version;
-use crate::DenoSubcommand;
 use deno_core::error::AnyError;
 use deno_core::serde_json;
 use deno_core::serde_json::json;
@@ -41,7 +40,6 @@ fn op_start(
     "noColor": !colors::use_color(),
     "pid": std::process::id(),
     "ppid": ppid(),
-    "repl": gs.flags.subcommand == DenoSubcommand::Repl,
     "target": env!("TARGET"),
     "tsVersion": version::TYPESCRIPT,
     "unstableFlag": gs.flags.unstable,