include and link lua 5.4, smoke test in panto cli main.zig

1 files changed, 32 insertions, 0 deletions

diff --git a/src/main.zig b/src/main.zig
index 20da910..6fbdb4b 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -2,6 +2,14 @@ const std = @import("std");
 const panto = @import("panto");
 const ping_tool = @import("ping_tool.zig");
 
+// Lua 5.4 C API. Linked statically via build.zig from the upstream lua.org
+// source tarball pinned in build.zig.zon.
+const lua = @cImport({
+    @cInclude("lua.h");
+    @cInclude("lauxlib.h");
+    @cInclude("lualib.h");
+});
+
 const Receiver = panto.provider.Receiver;
 const ReceiverVTable = panto.provider.ReceiverVTable;
 const ContentBlockType = panto.provider.ContentBlockType;
@@ -92,6 +100,26 @@ const CLIReceiver = struct {
     }
 };
 
+/// Spin up a Lua interpreter, run a no-op, tear it down. Catches
+/// link/compile errors on the Lua dependency at the earliest moment.
+/// Logs only in debug builds; release builds run silently.
+fn luaSmokeCheck() void {
+    const L = lua.luaL_newstate() orelse {
+        std.log.err("lua: luaL_newstate returned null", .{});
+        return;
+    };
+    defer lua.lua_close(L);
+    lua.luaL_openlibs(L);
+
+    // Push _VERSION to confirm libs loaded.
+    _ = lua.lua_getglobal(L, "_VERSION");
+    const ver = lua.lua_tolstring(L, -1, null);
+    if (ver != null) {
+        std.log.debug("lua: {s} linked OK", .{ver});
+    }
+    lua.lua_settop(L, 0);
+}
+
 fn loadConfig(environ_map: *const std.process.Environ.Map) !panto.config.Config {
     const style_str = environ_map.get("PANTO_API_STYLE") orelse "openai_chat";
     const style = std.meta.stringToEnum(panto.config.APIStyle, style_str) orelse {
@@ -167,6 +195,10 @@ pub fn main(init: std.process.Init) !void {
     const alloc = init.gpa;
     const io = init.io;
 
+    // Smoke test: prove Lua is linked. Slice 1 — no extension runtime
+    // wired up yet, this just confirms the static lib comes through.
+    luaSmokeCheck();
+
     const config = try loadConfig(init.environ_map);
 
     var stdout_buffer: [4096]u8 = undefined;