rebel-lang: repl: switch from rustyline to reedline

reedline has a nicer API than rustyline.

2 files changed, 17 insertions, 28 deletions

diff --git a/crates/rebel-lang/Cargo.toml b/crates/rebel-lang/Cargo.toml
index 957d31d..6601c8e 100644
--- a/crates/rebel-lang/Cargo.toml
+++ b/crates/rebel-lang/Cargo.toml
@@ -15,4 +15,4 @@ enum-kinds = "0.5.1"
 
 [dev-dependencies]
 clap = { version = "4.0.0", features = ["derive"] }
-rustyline = { version = "14.0.0", features = ["derive"] }
+reedline = "0.31.0"
diff --git a/crates/rebel-lang/examples/repl.rs b/crates/rebel-lang/examples/repl.rs
index 185155b..4a7b755 100644
--- a/crates/rebel-lang/examples/repl.rs
+++ b/crates/rebel-lang/examples/repl.rs
@@ -5,7 +5,7 @@ use rebel_lang::{
 	value::{EvalError, Result, Value},
 };
 use rebel_parse::{recipe, tokenize};
-use rustyline::{error::ReadlineError, validate::ValidationResult};
+use reedline::{DefaultPrompt, DefaultPromptSegment, Reedline, Signal, ValidationResult};
 
 fn intrinsic_array_len(params: &[Value]) -> Result<Value> {
 	assert!(params.len() == 1);
@@ -24,25 +24,19 @@ fn intrinsic_string_len(params: &[Value]) -> Result<Value> {
 	))
 }
 
-#[derive(rustyline::Completer, rustyline::Hinter, rustyline::Highlighter, rustyline::Helper)]
-struct Helper;
+struct Validator;
 
-impl rustyline::validate::Validator for Helper {
-	fn validate(
-		&self,
-		ctx: &mut rustyline::validate::ValidationContext,
-	) -> rustyline::Result<rustyline::validate::ValidationResult> {
-		let input = ctx.input();
-		let result = match tokenize::token_stream(input) {
-			Ok(_) => ValidationResult::Valid(None),
-			Err(_) => ValidationResult::Incomplete,
-		};
-
-		Ok(result)
+impl reedline::Validator for Validator {
+	fn validate(&self, line: &str) -> ValidationResult {
+		if tokenize::token_stream(line).is_ok() {
+			ValidationResult::Complete
+		} else {
+			ValidationResult::Incomplete
+		}
 	}
 }
 
-fn main() -> rustyline::Result<()> {
+fn main() {
 	let mut ctx = Context::default();
 
 	ctx.methods.entry(TypeFamily::Array).or_default().insert(
@@ -66,18 +60,15 @@ fn main() -> rustyline::Result<()> {
 		},
 	);
 
-	let mut rl = rustyline::Editor::<Helper, rustyline::history::DefaultHistory>::new()?;
-	rl.set_helper(Some(Helper));
+	let mut rl = Reedline::create().with_validator(Box::new(Validator));
+	let prompt = DefaultPrompt::new(DefaultPromptSegment::Empty, DefaultPromptSegment::Empty);
 
 	loop {
-		let input = match rl.readline("> ") {
-			Ok(input) => input,
-			Err(ReadlineError::Interrupted) => continue,
-			Err(ReadlineError::WindowResized) => continue,
-			Err(ReadlineError::Eof) => break,
-			Err(err) => panic!("{err}"),
+		let input = match rl.read_line(&prompt).unwrap() {
+			Signal::Success(input) => input,
+			Signal::CtrlC => continue,
+			Signal::CtrlD => break,
 		};
-		rl.add_history_entry(input.as_str())?;
 
 		let tokens = match tokenize::token_stream(&input) {
 			Ok(value) => value,
@@ -146,6 +137,4 @@ fn main() -> rustyline::Result<()> {
 		};
 		println!("{value}: {typ}");
 	}
-
-	Ok(())
 }