1 files changed, 42 insertions, 0 deletions
diff --git a/build/gen_panto_so_embed.zig b/build/gen_panto_so_embed.zig
new file mode 100644
index 0000000..37b8329
--- /dev/null
+++ b/build/gen_panto_so_embed.zig
@@ -0,0 +1,42 @@
+//! Build-time codegen: emit a Zig module exposing the compiled
+//! `libpanto-lua` shared object (`panto.so`) as embedded bytes. Bootstrap
+//! writes these to `<tree>/lib/lua/<short>/panto.so` on first run so the
+//! embedded VM's `require('panto')` resolves to the native module on a
+//! cold machine with no network — the guaranteed initial module load.
+//!
+//! Invoked from `build.zig`:
+//!
+//!     gen-panto-so-embed <embed-name> <out-file>
+//!
+//! `<embed-name>` is the filename the generated module `@embedFile`s; the
+//! actual `.so` is materialized alongside the generated file under that
+//! name via `addCopyFile` so `@embedFile` can reach it.
+
+const std = @import("std");
+
+pub fn main(init: std.process.Init) !void {
+    const io = init.io;
+
+    var args = init.minimal.args.iterate();
+    defer args.deinit();
+    _ = args.next();
+    const embed_name = args.next() orelse return error.MissingEmbedName;
+    const out_path = args.next() orelse return error.MissingOutPath;
+
+    var out_file = try std.Io.Dir.cwd().createFile(io, out_path, .{});
+    defer out_file.close(io);
+    var buf: [4096]u8 = undefined;
+    var writer = out_file.writer(io, &buf);
+    const w = &writer.interface;
+
+    try w.print(
+        \\//! Auto-generated. Do not edit. See build/gen_panto_so_embed.zig.
+        \\
+        \\/// The compiled `libpanto-lua` shared object, embedded so the
+        \\/// bootstrap can stage it onto the embedded VM's `package.cpath`.
+        \\pub const bytes: []const u8 = @embedFile("{s}");
+        \\
+    , .{embed_name});
+
+    try w.flush();
+}