syntax = "proto3";
package buffer;

service Buffer {
	rpc Attach (BufferPayload)    returns (stream RawOp);
	rpc Edit   (OperationRequest) returns (BufferResponse);
	rpc Create (BufferPayload)    returns (BufferResponse);
	rpc Sync   (BufferPayload)    returns (BufferResponse);
	rpc Moved  (Cursor)           returns (BufferResponse);
	rpc Listen (BufferPayload)    returns (stream Cursor);
}

message Position {
	int32 row = 1;
	int32 col = 2;
}

message Cursor {
	string user = 1;
	string buffer = 2;
	Position start = 3;
	Position end = 4;
}

message RawOp {
	string opseq = 1;
	string user = 2;
}

message OperationRequest {
	string path  = 1;
	string hash  = 2;
	string opseq = 3;
	string user  = 4;
}

message BufferPayload {
	string path = 1;
	string user = 2;
	optional string content = 3;
}

message BufferResponse {
	bool accepted = 1;
	optional string content = 2;
}