multiline validation

Cargo.lock

@@ -89,9 +89,9 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
 name = "bstr"
-version = "0.2.16"
+version = "0.2.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90682c8d613ad3373e66de8c6411e0ae2ab2571e879d2efbf73558cc66f21279"
+checksum = "ba3569f383e8f1598449f1a423e72e99569137b47740b1da11ef19af3d5c3223"
 dependencies = [
  "lazy_static",
  "memchr",
@@ -308,9 +308,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.101"
+version = "0.2.102"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3cb00336871be5ed2c8ed44b60ae9959dc5b9f08539422ed43f09e34ecaeba21"
+checksum = "a2a5ac8f984bfcf3a823267e5fde638acc3325f6496633a5da6bb6eb2171e103"
 
 [[package]]
 name = "lock_api"
@@ -339,7 +339,7 @@ checksum = "308cc39be01b73d0d18f82a0e7b2a3df85245f84af96fdddc5d202d27e47b86a"
 [[package]]
 name = "miette"
 version = "3.0.1-alpha.0"
-source = "git+https://github.com/zkat/miette?branch=release/3.0.0#491ce7c0ce1f04c9b6fc09c250f188c1ec77df53"
+source = "git+https://github.com/zkat/miette?branch=release/3.0.0#e02965787b5e6206dad46556a50edae578449789"
 dependencies = [
  "atty",
  "backtrace",
@@ -359,7 +359,7 @@ dependencies = [
 [[package]]
 name = "miette-derive"
 version = "3.0.0-alpha.0"
-source = "git+https://github.com/zkat/miette?branch=release/3.0.0#491ce7c0ce1f04c9b6fc09c250f188c1ec77df53"
+source = "git+https://github.com/zkat/miette?branch=release/3.0.0#e02965787b5e6206dad46556a50edae578449789"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -670,7 +670,7 @@ dependencies = [
 [[package]]
 name = "reedline"
 version = "0.1.0"
-source = "git+https://github.com/jntrnr/reedline?branch=main#cd87851ad9f238b491062bb854d65489ca2c4c1c"
+source = "git+https://github.com/jntrnr/reedline?branch=main#22fc31c68d1da6a41a93b5cfa901143b4eca4051"
 dependencies = [
  "chrono",
  "crossterm",
@@ -916,9 +916,9 @@ checksum = "8895849a949e7845e06bd6dc1aa51731a103c42707010a5b591c0038fb73385b"
 
 [[package]]
 name = "unicode-width"
-version = "0.1.8"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
+checksum = "3ed742d4ea2bd1176e236172c8429aaf54486e7ac098db29ffe6529e0ce50973"
 
 [[package]]
 name = "unicode-xid"

crates/nu-cli/src/lib.rs

@@ -1,7 +1,9 @@
 mod completions;
 mod errors;
 mod syntax_highlight;
+mod validation;
 
 pub use completions::NuCompleter;
 pub use errors::report_error;
 pub use syntax_highlight::NuHighlighter;
+pub use validation::NuValidator;

crates/nu-cli/src/validation.rs

@@ -0,0 +1,23 @@
+use std::{cell::RefCell, rc::Rc};
+
+use nu_parser::{parse, ParseError};
+use nu_protocol::engine::{EngineState, StateWorkingSet};
+use reedline::{ValidationResult, Validator};
+
+pub struct NuValidator {
+    pub engine_state: Rc<RefCell<EngineState>>,
+}
+
+impl Validator for NuValidator {
+    fn validate(&self, line: &str) -> ValidationResult {
+        let engine_state = self.engine_state.borrow();
+        let mut working_set = StateWorkingSet::new(&*engine_state);
+        let (_, err) = parse(&mut working_set, None, line.as_bytes(), false);
+
+        if matches!(err, Some(ParseError::UnexpectedEof(..))) {
+            ValidationResult::Incomplete
+        } else {
+            ValidationResult::Complete
+        }
+    }
+}

crates/nu-parser/src/errors.rs

@@ -21,7 +21,7 @@ pub enum ParseError {
 
     #[error("Unexpected end of code.")]
     #[diagnostic(code(nu::parser::unexpected_eof), url(docsrs))]
-    UnexpectedEof(String, #[label("expected {0}")] Span),
+    UnexpectedEof(String, #[label("expected closing {0}")] Span),
 
     #[error("Unclosed delimiter.")]
     #[diagnostic(code(nu::parser::unclosed_delimiter), url(docsrs))]

crates/nu-parser/src/lex.rs

@@ -181,7 +181,13 @@ pub fn lex_item(
         // correct information from the non-lite parse.
         return (
             span,
-            Some(ParseError::UnexpectedEof((delim as char).to_string(), span)),
+            Some(ParseError::UnexpectedEof(
+                (delim as char).to_string(),
+                Span {
+                    start: span.end,
+                    end: span.end,
+                },
+            )),
         );
     }
 

src/main.rs

@@ -1,5 +1,5 @@
 use miette::{IntoDiagnostic, Result};
-use nu_cli::{report_error, NuCompleter, NuHighlighter};
+use nu_cli::{report_error, NuCompleter, NuHighlighter, NuValidator};
 use nu_command::create_default_context;
 use nu_engine::eval_block;
 use nu_parser::parse;
@@ -71,7 +71,10 @@ fn main() -> Result<()> {
             }))
             .with_completion_action_handler(Box::new(
                 DefaultCompletionActionHandler::default().with_completer(Box::new(completer)),
-            ));
+            ))
+            .with_validator(Box::new(NuValidator {
+                engine_state: engine_state.clone(),
+            }));
 
         let prompt = DefaultPrompt::new(1);
         let stack = nu_protocol::engine::Stack::new();