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//! Build-time codegen: walk the in-repo `agent/` tree and emit a Zig
//! module that exposes every file as an `@embedFile` entry.
//!
//! Invoked from `build.zig`:
//!
//! gen-agent-embed <embed-prefix> <src-dir> <out-file>
//!
//! `<src-dir>` is the repo's `agent/` directory. `<embed-prefix>` is
//! the subpath the generated zig file's neighboring `addCopyDirectory`
//! stages the tree under; every `@embedFile` reference uses this
//! prefix so Zig can resolve it relative to the generated module's
//! directory.
//!
//! The generated file looks like:
//!
//! pub const Entry = struct {
//! /// Path relative to the agent tree root (e.g. "tools/read.lua").
//! path: []const u8,
//! /// File contents.
//! contents: []const u8,
//! };
//! pub const files: []const Entry = &.{
//! .{ .path = "tools/read.lua", .contents = @embedFile("...") },
//! ...
//! };
//!
//! Bootstrap walks `files` and stages each entry at
//! `$PANTO_HOME/agent/<path>` using the same `writeIfDifferent`
//! discipline as `stageLuaHeaders`.
const std = @import("std");
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(); // skip program name
const embed_prefix = args.next() orelse return error.MissingEmbedPrefix;
const src_dir_arg = args.next() orelse return error.MissingSrcDir;
const out_path_arg = args.next() orelse return error.MissingOutPath;
var entries: std.array_list.Managed(Entry) = .init(arena);
try collect(arena, io, src_dir_arg, embed_prefix, &entries);
// Sort for deterministic output across builds.
std.mem.sort(Entry, entries.items, {}, Entry.lessThan);
var out_file = try std.Io.Dir.cwd().createFile(io, out_path_arg, .{});
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_agent_embed.zig.
\\
\\pub const Entry = struct {
\\ /// Path relative to the agent tree root (e.g. "tools/read.lua").
\\ path: []const u8,
\\ /// File contents (raw bytes).
\\ contents: []const u8,
\\};
\\
\\pub const files: []const Entry = &.{
\\
);
for (entries.items) |e| {
try w.print(
" .{{ .path = \"{s}\", .contents = @embedFile(\"{s}\") }},\n",
.{ e.rel_path, e.embed_path },
);
}
try w.writeAll("};\n");
try w.flush();
}
const Entry = struct {
/// Path inside the agent tree, forward-slash separated.
rel_path: []const u8,
/// Path the generated `@embedFile` references (under embed prefix).
embed_path: []const u8,
fn lessThan(_: void, a: Entry, b: Entry) bool {
return std.mem.lessThan(u8, a.rel_path, b.rel_path);
}
};
/// Walk `<root>` recursively, collecting every file. Dotfiles
/// (entries whose basename starts with `.`) are skipped at every
/// level so we don't accidentally embed editor backups, `.DS_Store`,
/// or VCS metadata.
fn collect(
arena: std.mem.Allocator,
io: std.Io,
root_abs: []const u8,
embed_prefix: []const u8,
out: *std.array_list.Managed(Entry),
) !void {
var dir = std.Io.Dir.cwd().openDir(io, root_abs, .{ .iterate = true }) catch |err| switch (err) {
error.FileNotFound => return,
else => return err,
};
defer dir.close(io);
var walker = try dir.walk(arena);
defer walker.deinit();
while (try walker.next(io)) |entry| {
if (entry.kind != .file) continue;
if (entry.basename.len == 0 or entry.basename[0] == '.') continue;
// Skip anything along the path that looks like a dotfile dir.
if (std.mem.indexOf(u8, entry.path, "/.") != null) continue;
const rel_path = try arena.dupe(u8, entry.path);
const embed_path = try std.fs.path.join(arena, &.{ embed_prefix, entry.path });
try out.append(.{
.rel_path = rel_path,
.embed_path = embed_path,
});
}
}
|
