check at bootstrap which cluster is reachable, fix current cluster

TODO.md

@@ -3,3 +3,5 @@
 
 - Fix index names custom completion
 - add cluster default <name> which would add a flag to the config, so that no -C is needed subsequently
+- add `cluster stats` from `/_cluster/stats` like mem, procs, open files, num indices, shards etc
+- add version[s] to `cluster status`

pkg/cfg/config.go

@@ -17,6 +17,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package cfg
 
 import (
+	"context"
 	"crypto/tls"
 	"errors"
 	"fmt"
@@ -76,6 +77,8 @@ func (conf *Config) Init() error {
 		}
 	}
 
+	conf.SetupES()
+
 	if conf.CurrentCluster != "" {
 		current, exists := conf.Clusters[conf.CurrentCluster]
 		if !exists {
@@ -83,14 +86,29 @@ func (conf *Config) Init() error {
 		} else {
 			conf.DefaultCluster = current
 		}
+	} else {
+		if len(conf.Clusters) == 1 {
+			for _, cluster := range conf.Clusters {
+				conf.DefaultCluster = cluster
+			}
+		} else {
+			for _, cluster := range conf.Clusters {
+				_, err := cluster.ES.Cluster.Health().
+					Header("content-type", "application/json").
+					Header("accept", "application/json").
+					Do(context.Background())
+
+				if err == nil {
+					conf.DefaultCluster = cluster
+				}
+			}
+		}
 	}
 
 	if conf.Debug {
 		repr.Println(conf)
 	}
 
-	conf.SetupES()
-
 	return nil
 }
 

pkg/es/cluster.go

@@ -75,12 +75,24 @@ func ClusterCompare(conf *cfg.Config, leader, follower string) error {
 }
 
 func ClusterList(conf *cfg.Config) error {
-	table := NewTable(2, len(conf.Clusters))
-	table.Addheaders("cluster", "uri")
+	table := NewTable(3, len(conf.Clusters))
+
+	table.Addheaders("cluster", "uri", "default")
 
 	idx := 0
 	for name, cluster := range conf.Clusters {
-		table.entries[idx] = []string{name, cluster.Uri}
+		current := name == "default" || name == conf.CurrentCluster
+
+		_, err := cluster.ES.Cluster.Health().
+			Header("content-type", "application/json").
+			Header("accept", "application/json").
+			Do(context.Background())
+
+		if err == nil {
+			name = Colorize("green", name)
+		}
+
+		table.entries[idx] = []string{name, cluster.Uri, fmt.Sprintf("%t", current)}
 		idx++
 	}