Get nnn compile and run on Haiku (#403)

* Add support for Haiku OS

* Adjust DISTFILES and dist rule in haiku

1 files changed, 83 insertions, 0 deletions

diff --git a/misc/haiku/nm.cpp b/misc/haiku/nm.cpp
new file mode 100644
index 0000000..ede1d37
--- /dev/null
+++ b/misc/haiku/nm.cpp
@@ -0,0 +1,83 @@
+#include <Directory.h>
+#include <Looper.h>
+#include <NodeMonitor.h>
+#include <MessageFilter.h>
+
+#include "haiku_interop.h"
+
+filter_result dir_mon_flt(BMessage *message, BHandler **hnd, BMessageFilter *fltr) {
+	(void) hnd;
+	(void) fltr;
+
+	if (message->what == B_NODE_MONITOR) {
+		int32 val;
+		message->FindInt32("opcode", &val);
+
+		switch (val) {
+			case B_ENTRY_CREATED:
+			case B_ENTRY_MOVED:
+			case B_ENTRY_REMOVED:
+				return B_DISPATCH_MESSAGE;
+		}
+	}
+
+	return B_SKIP_MESSAGE;
+}
+
+class DirectoryListener : public BLooper {
+public:
+	bool recv_reset() {
+		Lock();
+		bool val = _ev_on;
+		_ev_on = false;
+		Unlock();
+
+		return val;
+	}
+private:
+	void MessageReceived(BMessage * message) override {
+		Lock();
+		_ev_on = true;
+		Unlock();
+		BLooper::MessageReceived(message);
+	}
+
+	bool _ev_on = false;
+};
+
+struct haiku_nm_t {
+	haiku_nm_t() {
+		dl = new DirectoryListener();
+		flt = new BMessageFilter(B_PROGRAMMED_DELIVERY, B_LOCAL_SOURCE, dir_mon_flt);
+		dl->AddCommonFilter(flt);
+		dl->Run();
+	}
+
+	DirectoryListener *dl;
+	BMessageFilter *flt;
+	node_ref nr;
+};
+
+haiku_nm_h haiku_init_nm() {
+	return new haiku_nm_t();
+}
+
+void haiku_close_nm(haiku_nm_h hnd) {
+	delete hnd->flt;
+	// This is the way of deleting a BLooper
+	hnd->dl->PostMessage(B_QUIT_REQUESTED);
+	delete hnd;
+}
+int haiku_watch_dir(haiku_nm_h hnd, const char *path) {
+	BDirectory dir(path);
+	dir.GetNodeRef(&(hnd->nr));
+
+	return watch_node(&(hnd->nr), B_WATCH_DIRECTORY, nullptr, hnd->dl);
+}
+int haiku_stop_watch(haiku_nm_h hnd) {
+	return watch_node(&(hnd->nr), B_STOP_WATCHING, nullptr, hnd->dl);
+}
+
+int haiku_is_update_needed(haiku_nm_h hnd) {
+	return hnd->dl->recv_reset();
+}