fix(tui): mouse wheel ansi codes leaking into editor

1 files changed, 54 insertions, 0 deletions

diff --git a/packages/tui/input/termcap.go b/packages/tui/input/termcap.go
new file mode 100644
index 000000000..3502189ff
--- /dev/null
+++ b/packages/tui/input/termcap.go
@@ -0,0 +1,54 @@
+package input
+
+import (
+	"bytes"
+	"encoding/hex"
+	"strings"
+)
+
+// CapabilityEvent represents a Termcap/Terminfo response event. Termcap
+// responses are generated by the terminal in response to RequestTermcap
+// (XTGETTCAP) requests.
+//
+// See: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands
+type CapabilityEvent string
+
+func parseTermcap(data []byte) CapabilityEvent {
+	// XTGETTCAP
+	if len(data) == 0 {
+		return CapabilityEvent("")
+	}
+
+	var tc strings.Builder
+	split := bytes.Split(data, []byte{';'})
+	for _, s := range split {
+		parts := bytes.SplitN(s, []byte{'='}, 2)
+		if len(parts) == 0 {
+			return CapabilityEvent("")
+		}
+
+		name, err := hex.DecodeString(string(parts[0]))
+		if err != nil || len(name) == 0 {
+			continue
+		}
+
+		var value []byte
+		if len(parts) > 1 {
+			value, err = hex.DecodeString(string(parts[1]))
+			if err != nil {
+				continue
+			}
+		}
+
+		if tc.Len() > 0 {
+			tc.WriteByte(';')
+		}
+		tc.WriteString(string(name))
+		if len(value) > 0 {
+			tc.WriteByte('=')
+			tc.WriteString(string(value))
+		}
+	}
+
+	return CapabilityEvent(tc.String())
+}