From ff4df63764c0cf60f7e4cbdf8381fb2c4dbbaf60 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Thu, 26 Feb 2026 15:27:10 +0000
Subject: [PATCH 1/2] fix(lexer): handle backslash-newline line continuation
 between tokens

Closes #289
---
 crates/bashkit/src/parser/lexer.rs     | 10 ++++++++++
 crates/bashkit/tests/issue_289_test.rs | 20 ++++++++++++++++++++
 2 files changed, 30 insertions(+)
 create mode 100644 crates/bashkit/tests/issue_289_test.rs

diff --git a/crates/bashkit/src/parser/lexer.rs b/crates/bashkit/src/parser/lexer.rs
index ee1ce750..7c54c779 100644
--- a/crates/bashkit/src/parser/lexer.rs
+++ b/crates/bashkit/src/parser/lexer.rs
@@ -231,6 +231,16 @@ impl<'a> Lexer<'a> {
         while let Some(ch) = self.peek_char() {
             if ch == ' ' || ch == '\t' {
                 self.advance();
+            } else if ch == '\\' {
+                // Check for backslash-newline (line continuation) between tokens
+                let mut lookahead = self.chars.clone();
+                lookahead.next(); // skip backslash
+                if lookahead.next() == Some('\n') {
+                    self.advance(); // consume backslash
+                    self.advance(); // consume newline
+                } else {
+                    break;
+                }
             } else {
                 break;
             }
diff --git a/crates/bashkit/tests/issue_289_test.rs b/crates/bashkit/tests/issue_289_test.rs
new file mode 100644
index 00000000..57321e1e
--- /dev/null
+++ b/crates/bashkit/tests/issue_289_test.rs
@@ -0,0 +1,20 @@
+//! Regression test for #289: backslash line continuation fails in some contexts
+
+use bashkit::Bash;
+
+#[tokio::test]
+async fn issue_289_backslash_continuation_if() {
+    let mut bash = Bash::new();
+    let r = bash
+        .exec("A=\"\"\nB=\"\"\nif [ -z \"$A\" ] || \\\n   [ -z \"$B\" ]; then\n    echo missing\nfi")
+        .await
+        .unwrap();
+    assert_eq!(r.stdout.trim(), "missing");
+}
+
+#[tokio::test]
+async fn issue_289_backslash_continuation_command() {
+    let mut bash = Bash::new();
+    let r = bash.exec("echo hello \\\n    world").await.unwrap();
+    assert_eq!(r.stdout.trim(), "hello world");
+}

From 12910e3570bda57f5fb3b1c3c719cbea7b23ed3c Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Thu, 26 Feb 2026 15:34:40 +0000
Subject: [PATCH 2/2] chore: fix formatting

---
 crates/bashkit/tests/issue_289_test.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/crates/bashkit/tests/issue_289_test.rs b/crates/bashkit/tests/issue_289_test.rs
index 57321e1e..39da8649 100644
--- a/crates/bashkit/tests/issue_289_test.rs
+++ b/crates/bashkit/tests/issue_289_test.rs
@@ -6,7 +6,9 @@ use bashkit::Bash;
 async fn issue_289_backslash_continuation_if() {
     let mut bash = Bash::new();
     let r = bash
-        .exec("A=\"\"\nB=\"\"\nif [ -z \"$A\" ] || \\\n   [ -z \"$B\" ]; then\n    echo missing\nfi")
+        .exec(
+            "A=\"\"\nB=\"\"\nif [ -z \"$A\" ] || \\\n   [ -z \"$B\" ]; then\n    echo missing\nfi",
+        )
         .await
         .unwrap();
     assert_eq!(r.stdout.trim(), "missing");