terminal: add sanitize.zig

src/terminal/sanitize.zig

@@ -0,0 +1,13 @@
+const std = @import("std");
+
+/// Returns true if the data looks safe to paste.
+pub fn isSafePaste(data: []const u8) bool {
+    return std.mem.indexOf(u8, data, "\n") == null;
+}
+
+test isSafePaste {
+    const testing = std.testing;
+    try testing.expect(isSafePaste("hello"));
+    try testing.expect(!isSafePaste("hello\n"));
+    try testing.expect(!isSafePaste("hello\nworld"));
+}