add support for a standard config in ~/.config/esctl/config.yaml (#7)

README.md

@@ -49,6 +49,10 @@ clusters:
     pass: asdasdasd
 ```
 
+and specify it with `-c configfile`.  You may also put clusters into a
+default config file in `~/.config/esctl/config.yaml`. In this case you
+can omit `-c ...`.
+
 If you want to  work on a specific cluster, specify  its name with the
 global `-C` option.
 

pkg/cfg/config.go

@@ -30,7 +30,7 @@ import (
 )
 
 const (
-	Version string = `v0.0.3`
+	Version string = `v0.0.4`
 )
 
 type Cluster struct {
@@ -57,11 +57,17 @@ func NewConfig() *Config {
 }
 
 func (conf *Config) Init() error {
-	if conf.ConfigFile != "" {
+	DefaultConfig := os.Getenv("HOME") + "/.config/esctl/config.yaml"
+
+	switch {
+	case fileExists(DefaultConfig):
+		conf.ConfigFile = DefaultConfig
+		fallthrough
+	case conf.ConfigFile != "":
 		if err := conf.LoadConfig(); err != nil {
 			return err
 		}
-	} else {
+	default:
 		if err := conf.LoadEnv(); err != nil {
 			return err
 		}
@@ -165,3 +171,14 @@ func (conf *Config) SetupES() error {
 
 	return nil
 }
+
+func fileExists(filename string) bool {
+	info, err := os.Stat(filename)
+
+	if err != nil {
+		// return false on any error
+		return false
+	}
+
+	return !info.IsDir()
+}

pkg/es/cluster.go

@@ -85,6 +85,7 @@ func List(conf *cfg.Config) error {
 		idx++
 	}
 
+	table.Sort()
 	table.PrintMarkdown()
 
 	return nil