ww: recursive DIR/... package discovery for ww test

selfhost/cmd/ww/main.ww

@@ -2044,7 +2044,7 @@ fn resolvemodule(selfdir: *u8, name: *u8, incs: *u8, isdir: *i32) *u8 = {
 // ---- Subcommand handlers ----------------------------------------------
 
 fn writeusage(fd: i32) void = {
-	let s: str = "usage: ww [-V] <subcommand> [args...]\n  -V                print version and exit\n  build  [-S] [-w DIR] [-o FILE] [path] compile module; -S stops after package asm\n  run    [path] ... build then exec, passing extra args to the program\n  test   [-S -o STEM] [-w DIR] [options] [path] build/run tests; -S emits package asm\n  version           print version and exit\n\n  path forms:\n    foo.ww          literal file\n    foo             search cwd, -I dirs, then $WW_LIB-equiv for foo.ww or foo/foo.ww\n    lib/foo         directory: build lib/foo/foo.ww\n    .               build the cwd's <basename>.ww\n";
+	let s: str = "usage: ww [-V] <subcommand> [args...]\n  -V                print version and exit\n  build  [-S] [-w DIR] [-o FILE] [path] compile module; -S stops after package asm\n  run    [path] ... build then exec, passing extra args to the program\n  test   [-S -o STEM] [-w DIR] [options] [path] build/run tests; -S emits package asm\n  version           print version and exit\n\n  path forms:\n    foo.ww          literal file\n    foo             search cwd, -I dirs, then $WW_LIB-equiv for foo.ww or foo/foo.ww\n    lib/foo         directory: build lib/foo/foo.ww\n    lib/...         every package under lib, recursively (test only)\n    .               build the cwd's <basename>.ww\n";
 	os.write(fd, s.ptr, s.len: u64);
 };
 
@@ -2672,6 +2672,34 @@ fn dotest(selfdir: *u8, argv: **u8, argc: i32, start: i32) i32 = {
 		return 2;
 	};
 
+	// Go's ./... form: a trailing "..." element is a package-tree
+	// request for the coordinator, never a literal path — recognized
+	// before stat, with the directory-mode rejects.
+	let tlen: u64 = cstrlen(target);
+	let istree: bool = cstreqlit(target, "...");
+	if (!istree && tlen >= 4u64) {
+		istree = target[tlen - 4u64] == '/'
+			&& target[tlen - 3u64] == '.'
+			&& target[tlen - 2u64] == '.'
+			&& target[tlen - 1u64] == '.';
+	};
+	if (istree) {
+		if (outstem != nil) {
+			cerr("ww test: -c/-S/-o need a single test file\n");
+			return 2;
+		};
+		if (workdir != nil) {
+			cerr("ww test: -w needs a single test file\n");
+			return 2;
+		};
+		if (patarg != nil) {
+			cerr("ww test: pattern needs a single test file\n");
+			return 2;
+		};
+		return execpackagetests(selfdir, argv, argc, start,
+			targetindex, nil, false);
+	};
+
 	let resolved: *u8 = target;
 	let isdir: i32 = 0;
 	let found: bool = false;