From 3fb6bb144998de72d03b58e7c1daf134e2438373 Mon Sep 17 00:00:00 2001
From: Ian Johnson <ian@ianjohnson.dev>
Date: Wed, 27 Mar 2024 23:25:21 -0400
Subject: [PATCH] std-docs: include builtin module in sources.tar

Now that `-femit-docs` includes all modules, including the builtin
module, in the generated source tarball, it makes sense to apply the
same logic to the std-docs server. std-docs constructs its own tarball,
so a different approach is needed to achieve the same end result.
---
 lib/compiler/std-docs.zig | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/lib/compiler/std-docs.zig b/lib/compiler/std-docs.zig
index 93a04a28e5..d86be67702 100644
--- a/lib/compiler/std-docs.zig
+++ b/lib/compiler/std-docs.zig
@@ -177,6 +177,26 @@ fn serveSourcesTar(request: *std.http.Server.Request, context: *Context) !void {
         try w.writeFile(file);
         try w.writeByteNTimes(0, padding);
     }
+
+    {
+        // Since this command is JIT compiled, the builtin module available in
+        // this source file corresponds to the user's host system.
+        const builtin_zig = @embedFile("builtin");
+
+        var file_header = std.tar.output.Header.init();
+        file_header.typeflag = .regular;
+        try file_header.setPath("builtin", "builtin.zig");
+        try file_header.setSize(builtin_zig.len);
+        try file_header.updateChecksum();
+        try w.writeAll(std.mem.asBytes(&file_header));
+        try w.writeAll(builtin_zig);
+        const padding = p: {
+            const remainder = builtin_zig.len % 512;
+            break :p if (remainder > 0) 512 - remainder else 0;
+        };
+        try w.writeByteNTimes(0, padding);
+    }
+
     // intentionally omitting the pointless trailer
     //try w.writeByteNTimes(0, 512 * 2);
     try response.end();