Flatten the 9P control tree and move it out of fs.zig

The served tree loses the self/ level: /index /ctl /new /log /screen
/listeners /pane/<n>/... /os, with /src only in -Dembed-sources=true builds
(default off, on for esp32p4). ctl speaks the editor's own language with two
lowercase verbs, look TEXT and exec TEXT, plus acme's addr verbs; the new/
factory directory becomes one clone file; cons is gone (exec Msg); name and
sel are files; stats report real lengths, modes and mtimes; /log streams
pane new/del/rename/save events. The tree code lives in src/ninep/
(tree, pane, ctl, addr, pty, events, screen, sources); fs.zig keeps host
access, mounts, resolution and find/grep. Same engine and transports.
README (fs-help.txt) and docs rewritten; tests updated and extended.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

1 files changed, 4 insertions, 2 deletions

diff --git a/build.zig b/build.zig
index aeae7443..6734d9b0 100644
--- a/build.zig
+++ b/build.zig
@@ -104,6 +104,7 @@ pub fn build(b: *std.Build) void {
     ninep_options.addOption(bool, "quic", enable_quic);
     const enable_mupdf = b.option(bool, "mupdf", "native PDF rendering with MuPDF (AGPL/commercial; native default on, web/esp32p4 off; -Dmupdf=false disables)") orelse !freestanding_core;
     const enable_jpx = b.option(bool, "jpx", "JPEG 2000 in PDFs, for scanned documents (default on; -Djpx=false drops openjpeg)") orelse true;
+    const embed_sources = b.option(bool, "embed-sources", "serve the editor's own sources under /src of its 9P tree (default off; on for -Dplatform=esp32p4, whose only source is the device)") orelse is_esp32p4;
     const is_web_target = target.result.cpu.arch == .wasm32 and target.result.os.tag == .freestanding;
     const is_esp32p4_target = target.result.cpu.arch == .riscv32 and target.result.os.tag == .freestanding;
     const optimize = if (is_web)
@@ -309,6 +310,7 @@ pub fn build(b: *std.Build) void {
         .esp32p4_rows = esp32p4_rows,
         .theme_animation = theme_animation,
         .prebuilt_shaders = prebuilt_shaders,
+        .embed_sources = embed_sources,
         .zig_lib_dir = b.graph.zig_lib_directory.path orelse "",
         .commit = gitCommit(b),
     };
@@ -600,8 +602,6 @@ pub fn build(b: *std.Build) void {
         if (shell == .macos) mod.addAnonymousImport("effect-source-crt.ci.metal", .{
             .root_source_file = b.path("shaders/crt.ci.metal"),
         });
-        mod.addAnonymousImport("root-build.zig", .{ .root_source_file = b.path("build.zig") });
-        mod.addAnonymousImport("root-build.zig.zon", .{ .root_source_file = b.path("build.zig.zon") });
     }
 
     const gui_shell_mod: ?*std.Build.Module = gui_mod orelse
@@ -1435,6 +1435,7 @@ const ShellConfig = struct {
     /// the default is off for the board and on everywhere else.
     theme_animation: ?bool,
     prebuilt_shaders: bool,
+    embed_sources: bool,
     zig_lib_dir: []const u8,
     commit: ?[]const u8,
 };
@@ -1456,6 +1457,7 @@ fn shellOptions(b: *std.Build, cfg: ShellConfig, platform: Platform) *std.Build.
     // prevents Config/EffectCode from describing tty/macOS/web as "prebuilt".
     o.addOption(bool, "gui_shader_sources_prebuilt", platform == .gui and cfg.prebuilt_shaders);
     o.addOption([]const u8, "zls_version", if (cfg.zls_backend) zls_version else "none");
+    o.addOption(bool, "embed_sources", cfg.embed_sources);
     o.addOption([]const u8, "version", zon.version);
     // ...and the commit it was built from, when there is one. See `gitCommit`
     // for why this is optional and why it is read at configure time.