omit runc connector from darwin build

connector/collector/proc.go

@@ -1,3 +1,5 @@
+// +build !darwin
+
 package collector
 
 import (

connector/collector/runc.go

@@ -1,3 +1,5 @@
+// +build !darwin
+
 package collector
 
 import (

connector/docker.go

@@ -1,4 +1,3 @@
-// +build ignore
 package connector
 
 import (

connector/enabled_darwin.go

@@ -0,0 +1,7 @@
+// +build !linux
+
+package connector
+
+var enabled = map[string]func() Connector{
+	"docker": NewDocker,
+}

connector/enabled_linux.go

@@ -0,0 +1,8 @@
+// +build !darwin
+
+package connector
+
+var enabled = map[string]func() Connector{
+	"docker": NewDocker,
+	"runc":   NewRunc,
+}

connector/main.go

@@ -1,12 +1,25 @@
 package connector
 
 import (
+	"fmt"
+
 	"github.com/bcicen/ctop/container"
 	"github.com/bcicen/ctop/logging"
 )
 
 var log = logging.Init()
 
+func ByName(s string) (Connector, error) {
+	if _, ok := enabled[s]; !ok {
+		msg := fmt.Sprintf("invalid connector type \"%s\"\nconnector must be one of:", s)
+		for k, _ := range enabled {
+			msg += fmt.Sprintf("\n  %s", k)
+		}
+		return nil, fmt.Errorf(msg)
+	}
+	return enabled[s](), nil
+}
+
 type Connector interface {
 	All() container.Containers
 	Get(string) (*container.Container, bool)

connector/runc.go

@@ -1,3 +1,5 @@
+// +build !darwin
+
 package connector
 
 import (