Added ability to set context in charts.yaml (#21)

* Added ability to set context in charts.yaml

* Added context to the documentation
Added error if —kube-context and context are both used.

README.md

@@ -21,6 +21,8 @@ repositories:
   - name: roboll
     url: http://roboll.io/charts
 
+context: kube-context					 # kube-context (--kube-context)
+
 charts:
   # Published chart example
   - name: vault                            # helm deployment name

main.go

@@ -225,7 +225,13 @@ func before(c *cli.Context) (*state.HelmState, helmexec.Interface, error) {
 	if err != nil {
 		return nil, nil, err
 	}
-
+	if state.Context != "" {
+		if kubeContext != "" {
+			log.Printf("err: Cannot use option --kube-context and set attribute context.")
+			os.Exit(1)
+		}
+		kubeContext = state.Context
+	}
 	var writer io.Writer
 	if !quiet {
 		writer = os.Stdout

state/state.go

@@ -20,6 +20,7 @@ import (
 
 type HelmState struct {
 	BaseChartPath string
+	Context       string           `yaml:"context"`
 	Repositories  []RepositorySpec `yaml:"repositories"`
 	Charts        []ChartSpec      `yaml:"charts"`
 }