fix: preserve multiline paste in terminal attach (#3056)

refs #3054

Co-authored-by: akbash-bot <300245827+akbash-bot@users.noreply.github.com>

1 files changed, 17 insertions, 11 deletions

diff --git a/src/raw_input.rs b/src/raw_input.rs
index 510768fc..5f750ca8 100644
--- a/src/raw_input.rs
+++ b/src/raw_input.rs
@@ -108,19 +108,22 @@ pub(crate) const GHOSTTY_COLOR_SCHEME_LIGHT_REPORT: &[u8] = b"\x1b[?997;2n";
 const BRACKETED_PASTE_START: &[u8] = b"\x1b[200~";
 const BRACKETED_PASTE_END: &[u8] = b"\x1b[201~";
 
-/// Returns whether `data` is exactly one complete bracketed-paste sequence.
-///
+/// Returns the UTF-8 payload when `data` is exactly one complete bracketed paste.
+pub(crate) fn complete_text_bracketed_paste(data: &[u8]) -> Option<&str> {
+    if !data.starts_with(BRACKETED_PASTE_START) {
+        return None;
+    }
+    let end = find_subsequence(data, BRACKETED_PASTE_END)?;
+    if end + BRACKETED_PASTE_END.len() != data.len() {
+        return None;
+    }
+    std::str::from_utf8(&data[BRACKETED_PASTE_START.len()..end]).ok()
+}
+
 /// Client transport uses this to distinguish recoverable oversized interactive
 /// pastes from generic oversized input, which remains a protocol violation.
 pub(crate) fn is_complete_text_bracketed_paste(data: &[u8]) -> bool {
-    if !data.starts_with(BRACKETED_PASTE_START) {
-        return false;
-    }
-    let Some(end) = find_subsequence(data, BRACKETED_PASTE_END) else {
-        return false;
-    };
-    end + BRACKETED_PASTE_END.len() == data.len()
-        && std::str::from_utf8(&data[BRACKETED_PASTE_START.len()..end]).is_ok()
+    complete_text_bracketed_paste(data).is_some()
 }
 
 #[derive(Debug)]
@@ -1424,7 +1427,10 @@ mod tests {
 
     #[test]
     fn complete_text_bracketed_paste_requires_one_exact_utf8_sequence() {
-        assert!(is_complete_text_bracketed_paste(b"\x1b[200~hello\x1b[201~"));
+        assert_eq!(
+            complete_text_bracketed_paste(b"\x1b[200~hello\x1b[201~"),
+            Some("hello")
+        );
         assert!(!is_complete_text_bracketed_paste(b"\x1b[200~hello"));
         assert!(!is_complete_text_bracketed_paste(
             b"\x1b[200~hello\x1b[201~rest"