mcpplibs os 0.1.0; member tests/examples/os (#572)

Co-authored-by: speak-agent <248744407+speak-agent@users.noreply.github.com>

Author: Sunrisepeak

mcpp.toml

@@ -225,6 +225,7 @@ members = [
     "tests/examples/openkal-musl",
     "tests/examples/compiler-rt-builtins",
     "tests/examples/openkal-tools",
+    "tests/examples/os",
 ]
 
 # ── The index redirect, hoisted to the workspace root ───────────────────

pkgs/o/os.lua

@@ -0,0 +1,51 @@
+-- os --- mcpplibs.os, a C++ operating-system library over openkal.
+--
+-- Processes, files, the environment, terminals, conventional directories and
+-- local IPC, composed from openkal's atoms, with compile-time platform
+-- constants for a program built for a system and `host()' answered at load for
+-- one built as an ok image (`<arch>-openkal').
+--
+-- No `deps'. The package names openkal and, for the system it is built for,
+-- that system's implementation in its own manifest; a program that builds ok
+-- images names the C library and the C++ run-time inside them itself.
+package = {
+    spec        = "1",
+    namespace   = "mcpplibs",
+    name        = "os",
+    description = "mcpplibs.os: a C++ operating-system library over openkal --- processes, files, environment, terminals, directories and local IPC, with compile-time platform constants and a few platform modules",
+    licenses    = {"Apache-2.0"},
+    repo        = "https://github.com/mcpplibs/os",
+    type        = "package",
+
+    xpm = {
+        linux = {
+            ["0.1.0"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/os/archive/refs/tags/0.1.0.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/os/releases/download/0.1.0/os-0.1.0.tar.gz",
+                },
+                sha256 = "f7e4117612d721da2ae311cb36afab42625391208e4b0f8e8491534a00b6ab18",
+            },
+        },
+        macosx = {
+            ["0.1.0"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/os/archive/refs/tags/0.1.0.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/os/releases/download/0.1.0/os-0.1.0.tar.gz",
+                },
+                sha256 = "f7e4117612d721da2ae311cb36afab42625391208e4b0f8e8491534a00b6ab18",
+            },
+        },
+        windows = {
+            ["0.1.0"] = {
+                url    = {
+                    GLOBAL = "https://github.com/mcpplibs/os/archive/refs/tags/0.1.0.tar.gz",
+                    CN     = "https://gitcode.com/mcpp-res/os/releases/download/0.1.0/os-0.1.0.tar.gz",
+                },
+                sha256 = "f7e4117612d721da2ae311cb36afab42625391208e4b0f8e8491534a00b6ab18",
+            },
+        },
+    },
+
+    mcpp = "*/mcpp.toml",
+}

tests/examples/os/mcpp.toml

@@ -0,0 +1,12 @@
+# mcpplibs.os test project: the library over this system's openkal
+# implementation, on every runner --- a program started and read, a file
+# published, a list of directories split, and the platform the build is for.
+[package]
+name    = "os-tests"
+version = "0.1.0"
+
+[dependencies.mcpplibs]
+os = "0.1.0"
+
+[indices]
+mcpplibs = { path = "../../.." }

tests/examples/os/tests/os.cpp

@@ -0,0 +1,41 @@
+// mcpplibs.os on this runner: the platform, a published file, a list of directories, and a
+// program started and read (this test, started again).
+import std;
+import mcpplibs.os;
+
+namespace os = mcpplibs::os;
+
+int main(int argc, char** argv) {
+    if (argc > 1 && std::string_view(argv[1]) == "--echo") {
+        (void)os::stdio::write_output("echoed");
+        return 0;
+    }
+    int failures = 0;
+    auto check = [&](bool ok, std::string_view what) { if (!ok) { ++failures; std::println(std::cerr, "FAIL: {}", what); } };
+
+    check(os::host() == os::PLATFORM, "built for a system, the host is that system");
+    const auto dir = os::dirs::temp() / std::format("os-tests-{}", os::process::self()->id);
+    std::filesystem::create_directories(dir);
+    const auto file = dir / "published.txt";
+    check(os::fs::publish(file, "first").has_value(), "a free name is published");
+    check(!os::fs::publish(file, "second").has_value(), "a published name is not replaced");
+    check(os::fs::read(file).value_or("") == "first", "and keeps what was published first");
+
+    const char sep = os::conventions().path_list_separator;
+    const auto parts = os::env::split_list(std::string("a") + sep + sep + "b");
+    check(parts.size() == 2, "a list of directories splits at the host's separator");
+
+    const auto again = os::env::self_command();
+    if (!again.empty()) {
+        os::process::spawn_options o;
+        o.program = again.front();
+        o.args.assign(again.begin() + 1, again.end());
+        o.args.push_back("--echo");
+        auto r = os::process::run(o);
+        check(r && r->status.success() && r->out == "echoed", "a started program's output is read");
+    }
+    std::error_code ec;
+    std::filesystem::remove_all(dir, ec);
+    if (failures == 0) std::println("os-tests: held");
+    return failures;
+}