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//! Build-time codegen: emit a Zig module exposing every Lua public
//! header from the Lua source tarball as embedded bytes. Bootstrap
//! writes these to `<data home>/rocks/lua-X.Y.Z/include/` on first run
//! so luarocks can compile C rocks against them.
//!
//! Invoked from `build.zig`:
//!
//! gen-lua-headers-embed <lua-src-dir> <out-file>
//!
//! `<lua-src-dir>` is the `src/` directory of the Lua tarball.
const std = @import("std");
const headers = [_][]const u8{
"lua.h",
"luaconf.h",
"lualib.h",
"lauxlib.h",
// hpp is the C++-friendly include shim shipped upstream; some C
// rocks reference it.
"lua.hpp",
};
pub fn main(init: std.process.Init) !void {
const arena = init.arena.allocator();
const io = init.io;
var args = init.minimal.args.iterate();
defer args.deinit();
_ = args.next();
const embed_prefix = args.next() orelse return error.MissingEmbedPrefix;
const src_dir = args.next() orelse return error.MissingSrcDir;
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.writeAll(
\\//! Auto-generated. Do not edit. See build/gen_lua_headers_embed.zig.
\\
\\pub const Entry = struct {
\\ name: []const u8,
\\ contents: []const u8,
\\};
\\
\\pub const files: []const Entry = &.{
\\
);
for (headers) |name| {
const abs = try std.fs.path.join(arena, &.{ src_dir, name });
// Verify the file exists; emit nothing for missing files (lua.hpp
// exists in current Lua releases but we don't want to hard-fail
// if the tarball ever drops it).
std.Io.Dir.cwd().access(io, abs, .{}) catch continue;
const embed_path = try std.fs.path.join(arena, &.{ embed_prefix, name });
try w.print(
" .{{ .name = \"{s}\", .contents = @embedFile(\"{s}\") }},\n",
.{ name, embed_path },
);
}
try w.writeAll("};\n");
try w.flush();
}
|
