基本完成

src/common.cpp

@@ -0,0 +1,35 @@
+# include <hpcstat/common.hpp>
+# include <boost/filesystem.hpp>
+# include <boost/process.hpp>
+# include <boost/dll.hpp>
+
+namespace hpcstat
+{
+  std::optional<std::string> exec
+    (std::filesystem::path program, std::vector<std::string> args, std::optional<std::string> stdin)
+  {
+    namespace bp = boost::process;
+    bp::ipstream output;
+    bp::opstream input;
+    std::unique_ptr<bp::child> process;
+    if (stdin)
+    {
+      process = std::make_unique<bp::child>
+        (program.string(), bp::args(args), bp::std_out > output, bp::std_err > stderr, bp::std_in < input);
+      input << *stdin;
+      input.close();
+    }
+    else process = std::make_unique<bp::child>
+      (program.string(), bp::args(args), bp::std_out > output, bp::std_err > stderr, bp::std_in < bp::null);
+    process->wait();
+    if (process->exit_code() != 0) return std::nullopt;
+    std::stringstream ss;
+    ss << output.rdbuf();
+    return ss.str();
+  }
+  long now()
+  {
+    return std::chrono::duration_cast<std::chrono::seconds>
+      (std::chrono::system_clock::now().time_since_epoch()).count();
+  }
+}