Groundwork for running different applications

sunshine/process.h

@@ -0,0 +1,67 @@
+//
+// Created by loki on 12/14/19.
+//
+
+#ifndef SUNSHINE_PROCESS_H
+#define SUNSHINE_PROCESS_H
+
+#include <unordered_map>
+
+#include <boost/process.hpp>
+#include "utility.h"
+
+namespace proc {
+using file_t = util::safe_ptr_v2<FILE, int, fclose>;
+
+struct cmd_t {
+  std::string do_cmd;
+
+  // Executed when proc_t has finished running, meant to reverse 'do_cmd' if applicable
+  std::string undo_cmd;
+};
+/*
+ * pre_cmds -- guaranteed to be executed unless any of the commands fail.
+ * cmd -- Runs indefinitely until:
+ *    No session is running and a different set of commands it to be executed
+ *    Command exits
+ * cmd_output --
+ *    empty    -- The output of the commands are appended to the output of sunshine
+ *    "null"   -- The output of the commands are discarded
+ *    filename -- The output of the commands are appended to filename
+ */
+struct ctx_t {
+  std::vector<cmd_t> pre_cmds;
+
+  std::string cmd;
+  std::string cmd_output;
+};
+
+class proc_t {
+public:
+  KITTY_DEFAULT_CONSTR(proc_t)
+
+  proc_t(
+    boost::process::environment &&env,
+    std::unordered_map<std::string, ctx_t> &&name_to_proc) :
+    _env(std::move(env)),
+    _name_to_proc(std::move(name_to_proc)) {}
+
+  int execute(const std::string &name);
+  bool running();
+
+  ~proc_t();
+
+private:
+  void _undo_pre_cmd();
+
+  boost::process::environment _env;
+  std::unordered_map<std::string, ctx_t> _name_to_proc;
+
+  boost::process::child _process;
+  file_t _pipe;
+  std::vector<cmd_t>::const_iterator _undo_it;
+  std::vector<cmd_t>::const_iterator _undo_begin;
+};
+
+}
+#endif //SUNSHINE_PROCESS_H