$ go get github.com/xarg/gopathfinding

$ git clone git://github.com/xarg/gopathfinding
$ cd gopathfinding
$ make install

import (
        "fmt"
        pathfinding "github.com/xarg/gopathfinding"
)

func main() {
        //A pathfinding.MapData containing the 
        //coordinates(x, y) of LAND, WALL, START and STOP of the map.
        //If your map is something more than 2d matrix then you might want to modify adjacentNodes

        graph := pathfinding.NewGraph(map_data)

        //Returns a list of nodes from START to STOP avoiding all obstacles if possible
        shortest_path := pathfinding.Astar(graph)
}

$ go doc github.com/xarg/gopathfinding