initial pass at an autoreloader (broken! non-recursive inotify)

src/notify.h

@@ -0,0 +1,58 @@
+#include <sys/inotify.h>
+#include <inotifytools/inotifytools.h>
+#include <cerrno>
+#include <poll.h>
+#include "project.h"
+
+#define MAX_WDS 16
+
+typedef void (Project::*ProjectReloadFn)();
+
+class NotifyService {
+public:
+	NotifyService() {
+		this->inotify_fd = inotify_init1(IN_NONBLOCK);
+		if (inotify_fd == -1) {
+			perror("inotify_init1");
+			exit(EXIT_FAILURE);
+		}
+
+		std::cout << "inotify fd: " << inotify_fd << '\n';
+
+		this->poll_fd = {.fd = inotify_fd, .events = POLLIN, 0};
+	}
+
+	void watch(Project &project) {
+		int wd = inotify_add_watch(this->inotify_fd, project.basepath.str().c_str(),
+				IN_MODIFY);
+
+		if (wd == -1) {
+			std::cerr << "Failed to watch project base directory: " << project.basepath.str().c_str() << '\n';
+			perror("inotify_add_watch");
+			exit(EXIT_FAILURE);
+		}
+
+		std::cerr << "Watching " << project.basepath << " with wd: " << wd << '\n';
+
+		this->watch_ids.push_back(wd);
+	}
+
+	void _poll() {
+		int rc = poll(&this->poll_fd, 1, 0);
+		std::cout << "poll() -> " << rc << '\n';
+		if (rc == -1) {
+			if (errno == EINTR)
+				return;
+			perror("poll");
+			exit(EXIT_FAILURE);
+		}
+
+		if (rc > 0) {
+			std::cout << "poll data available!\n";
+		}
+	}
+private:
+	int inotify_fd;
+	struct pollfd poll_fd;
+	std::vector<int> watch_ids;
+};