From ac1c5e46f981d300ad0051ebabbf08d78cfd395b Mon Sep 17 00:00:00 2001
From: Sergey Shcherbina <trytoheal@gmail.com>
Date: Mon, 22 Aug 2016 02:32:06 +0500
Subject: [PATCH] support geopos command

---
 command.go  | 42 ++++++++++++++++++++++++++++++++++++++++++
 commands.go | 13 +++++++++++++
 parser.go   | 42 ++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 97 insertions(+)

diff --git a/command.go b/command.go
index 9cb7058..d89eab6 100644
--- a/command.go
+++ b/command.go
@@ -806,6 +806,10 @@ type GeoLocation struct {
 	GeoHash                   int64
 }
 
+type GeoPosition struct {
+	Longitude, Latitude float64
+}
+
 // GeoRadiusQuery is used with GeoRadius to query geospatial index.
 type GeoRadiusQuery struct {
 	Radius float64
@@ -882,6 +886,44 @@ func (cmd *GeoLocationCmd) readReply(cn *pool.Conn) error {
 	return nil
 }
 
+type GeoPosCmd struct {
+	baseCmd
+
+	positions []*GeoPosition
+}
+
+func NewGeoPosCmd(args ...interface{}) *GeoPosCmd {
+	cmd := newBaseCmd(args)
+	return &GeoPosCmd{baseCmd: cmd}
+}
+
+func (cmd *GeoPosCmd) Val() []*GeoPosition {
+	return cmd.positions
+}
+
+func (cmd *GeoPosCmd) Result() ([]*GeoPosition, error) {
+	return cmd.Val(), cmd.Err()
+}
+
+func (cmd *GeoPosCmd) String() string {
+	return cmdString(cmd, cmd.positions)
+}
+
+func (cmd *GeoPosCmd) reset() {
+	cmd.positions = nil
+	cmd.err = nil
+}
+
+func (cmd *GeoPosCmd) readReply(cn *pool.Conn) error {
+	reply, err := cn.Rd.ReadArrayReply(newGeoPositionSliceParser())
+	if err != nil {
+		cmd.err = err
+		return err
+	}
+	cmd.positions = reply.([]*GeoPosition)
+	return nil
+}
+
 //------------------------------------------------------------------------------
 
 type CommandInfo struct {
diff --git a/commands.go b/commands.go
index d7f2249..bcaeada 100644
--- a/commands.go
+++ b/commands.go
@@ -234,6 +234,7 @@ type Cmdable interface {
 	ClusterAddSlots(slots ...int) *StatusCmd
 	ClusterAddSlotsRange(min, max int) *StatusCmd
 	GeoAdd(key string, geoLocation ...*GeoLocation) *IntCmd
+	GeoPos(key string, name ...string) *GeoPosCmd
 	GeoRadius(key string, longitude, latitude float64, query *GeoRadiusQuery) *GeoLocationCmd
 	GeoRadiusByMember(key, member string, query *GeoRadiusQuery) *GeoLocationCmd
 	GeoDist(key string, member1, member2, unit string) *FloatCmd
@@ -2054,6 +2055,18 @@ func (c *cmdable) GeoHash(key string, members ...string) *StringSliceCmd {
 	return cmd
 }
 
+func (c *cmdable) GeoPos(key string, names ...string) *GeoPosCmd {
+	args := make([]interface{}, 2+len(names))
+	args[0] = "geopos"
+	args[1] = key
+	for i, name := range names {
+		args[2+i] = name
+	}
+	cmd := NewGeoPosCmd(args...)
+	c.process(cmd)
+	return cmd
+}
+
 //------------------------------------------------------------------------------
 
 func (c *cmdable) Command() *CommandsInfoCmd {
diff --git a/parser.go b/parser.go
index 95a4297..c1db8d0 100644
--- a/parser.go
+++ b/parser.go
@@ -273,6 +273,48 @@ func newGeoLocationSliceParser(q *GeoRadiusQuery) proto.MultiBulkParse {
 	}
 }
 
+func newGeoPositionParser() proto.MultiBulkParse {
+	return func(rd *proto.Reader, n int64) (interface{}, error) {
+		var pos GeoPosition
+		var err error
+
+		pos.Longitude, err = rd.ReadFloatReply()
+		if err != nil {
+			return nil, err
+		}
+		pos.Latitude, err = rd.ReadFloatReply()
+		if err != nil {
+			return nil, err
+		}
+
+		return &pos, nil
+	}
+}
+
+func newGeoPositionSliceParser() proto.MultiBulkParse {
+	return func(rd *proto.Reader, n int64) (interface{}, error) {
+		positions := make([]*GeoPosition, 0, n)
+		for i := int64(0); i < n; i++ {
+			v, err := rd.ReadReply(newGeoPositionParser())
+			if err != nil {
+				// response may contain nil results
+				if err == Nil {
+					positions = append(positions, nil)
+					continue
+				}
+				return nil, err
+			}
+			switch vv := v.(type) {
+			case *GeoPosition:
+				positions = append(positions, vv)
+			default:
+				return nil, fmt.Errorf("got %T, expected *GeoPosition", v)
+			}
+		}
+		return positions, nil
+	}
+}
+
 func commandInfoParser(rd *proto.Reader, n int64) (interface{}, error) {
 	var cmd CommandInfo
 	var err error