Rename ruff crate to ruff_linter (#7529)

crates/ruff_linter/src/message/json_lines.rs

@@ -0,0 +1,39 @@
+use std::io::Write;
+
+use crate::message::json::message_to_json_value;
+use crate::message::{Emitter, EmitterContext, Message};
+
+#[derive(Default)]
+pub struct JsonLinesEmitter;
+
+impl Emitter for JsonLinesEmitter {
+    fn emit(
+        &mut self,
+        writer: &mut dyn Write,
+        messages: &[Message],
+        _context: &EmitterContext,
+    ) -> anyhow::Result<()> {
+        let mut w = writer;
+        for message in messages {
+            serde_json::to_writer(&mut w, &message_to_json_value(message))?;
+            w.write_all(b"\n")?;
+        }
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use insta::assert_snapshot;
+
+    use crate::message::json_lines::JsonLinesEmitter;
+    use crate::message::tests::{capture_emitter_output, create_messages};
+
+    #[test]
+    fn output() {
+        let mut emitter = JsonLinesEmitter;
+        let content = capture_emitter_output(&mut emitter, &create_messages());
+
+        assert_snapshot!(content);
+    }
+}