* showing help by basic call

* autocompletion for exec

cmd/exec/exec.go

@@ -3,6 +3,7 @@ package exec
 import (
 	"errors"
 	"fmt"
+	"git.denysoft.de/CubeBit/ssh-hub/util"
 	"github.com/creack/pty"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
@@ -16,6 +17,10 @@ import (
 var execCmd = &cobra.Command{
 	Use:   "exec",
 	Short: "Execute command of specific alias",
+	ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+		data := viper.GetStringMapString("data")
+		return util.AutocompleteConfig(&data, toComplete), cobra.ShellCompDirectiveNoFileComp
+	},
 	Args: func(cmd *cobra.Command, args []string) error {
 		if err := cobra.ExactArgs(1)(cmd, args); err != nil {
 			return err