The prompt passed to readline() contained raw ANSI SGR sequences
("\e[1;37m" and "\e[0m") with no marker for readline to exclude them
from its column accounting, so readline counted those 9 bytes as
printable columns. While typing this was invisible, but once the line
wrapped, readline's display model carried one extra (phantom) row. On
accept, _rl_update_final() then took its "remove the final xterm
line-wrap flag" branch, moving the cursor up one row and repainting the
final character over the end of the previous row. The multi-line
continuation loop made it obvious: the "... " prompt was printed on top
of the wrapped tail and the continued line landed one row too high.
Wrapping the escape sequences in readline's \001 / \002 non-printing
markers makes their width 0, which removes the phantom row. The joined
text was already correct; only the rendering was wrong.
Verified at 40 columns with a 67 character line and at 80 columns with
a 147 character line, both the lengths that triggered the corruption.
main.c is the whole agent: a readline REPL that talks to any OpenAI-compatible
/chat/completions endpoint and exposes exactly one tool, bash(command). Commands
run through the user's shell with stdout and stderr merged, a hard timeout, and
a process-group kill; the output and an exit marker go back to the model until
it answers without calling a tool.
make static-deps builds curl and c-ares from source into static-deps/, so
`make static` can link a fully static binary on distros that get in the way: the
distro libcurl.a drags in libpsl, brotli, zstd and nghttp2, whose static objects
are GCC 14 LTO bytecode a newer linker cannot read, and a minimal system often
ships no libcares.a at all.
Two details worth keeping in mind when editing mkstaticdeps.sh. curl 8.22 takes
--enable-ares=PREFIX rather than the older --with-cares, and it only warns
about options it does not recognise, so the wrong spelling turns off async DNS
in silence instead of failing. And link order is load-bearing: libcares.a has
to come after libcurl.a or ares_* stays undefined.
Luxferre