add support for output format in json or yaml

cmd/helm/history.go

@@ -23,12 +23,24 @@ import (
 	"github.com/gosuri/uitable"
 	"github.com/spf13/cobra"
 
+	"encoding/json"
+	"github.com/ghodss/yaml"
 	"k8s.io/helm/pkg/helm"
 	"k8s.io/helm/pkg/proto/hapi/chart"
 	"k8s.io/helm/pkg/proto/hapi/release"
 	"k8s.io/helm/pkg/timeconv"
 )
 
+type releaseInfo struct {
+	Revision    int32  `json:"revision" yaml:"revision"`
+	Updated     string `json:"updated" yaml:"updated"`
+	Status      string `json:"status" yaml:"status"`
+	Chart       string `json:"chart" yaml:"chart"`
+	Description string `json:"description" yaml:"description"`
+}
+
+type releaseHistory []releaseInfo
+
 var historyHelp = `
 History prints historical revisions for a given release.
 
@@ -46,11 +58,12 @@ The historical release set is printed as a formatted table, e.g:
 `
 
 type historyCmd struct {
-	max      int32
-	rls      string
-	out      io.Writer
-	helmc    helm.Interface
-	colWidth uint
+	max          int32
+	rls          string
+	out          io.Writer
+	helmc        helm.Interface
+	colWidth     uint
+	outputFormat string
 }
 
 func newHistoryCmd(c helm.Interface, w io.Writer) *cobra.Command {
@@ -77,6 +90,7 @@ func newHistoryCmd(c helm.Interface, w io.Writer) *cobra.Command {
 	f := cmd.Flags()
 	f.Int32Var(&his.max, "max", 256, "maximum number of revision to include in history")
 	f.UintVar(&his.colWidth, "col-width", 60, "specifies the max column width of output")
+	f.StringVarP(&his.outputFormat, "output", "o", "", "prints the output in the specified format ('json' or 'yaml' or defaults to 'table')")
 
 	return cmd
 }
@@ -90,25 +104,60 @@ func (cmd *historyCmd) run() error {
 		return nil
 	}
 
-	fmt.Fprintln(cmd.out, formatHistory(r.Releases, cmd.colWidth))
+	releaseHistory := getReleaseHistory(r.Releases)
+
+	var history []byte
+	var formattingError error
+
+	switch cmd.outputFormat {
+	case "yaml":
+		history, formattingError = yaml.Marshal(releaseHistory)
+	case "json":
+		history, formattingError = json.Marshal(releaseHistory)
+	default:
+		history = formatAsTable(releaseHistory, cmd.colWidth)
+	}
+
+	if formattingError != nil {
+		return prettyError(formattingError)
+	}
+
+	fmt.Fprintln(cmd.out, string(history))
 	return nil
 }
 
-func formatHistory(rls []*release.Release, colWidth uint) string {
-	tbl := uitable.New()
-
-	tbl.MaxColWidth = colWidth
-	tbl.AddRow("REVISION", "UPDATED", "STATUS", "CHART", "DESCRIPTION")
+func getReleaseHistory(rls []*release.Release) (history releaseHistory) {
 	for i := len(rls) - 1; i >= 0; i-- {
 		r := rls[i]
 		c := formatChartname(r.Chart)
 		t := timeconv.String(r.Info.LastDeployed)
 		s := r.Info.Status.Code.String()
 		v := r.Version
 		d := r.Info.Description
-		tbl.AddRow(v, t, s, c, d)
+
+		rInfo := releaseInfo{
+			Revision:    v,
+			Updated:     t,
+			Status:      s,
+			Chart:       c,
+			Description: d,
+		}
+		history = append(history, rInfo)
+	}
+
+	return history
+}
+
+func formatAsTable(releases releaseHistory, colWidth uint) []byte {
+	tbl := uitable.New()
+
+	tbl.MaxColWidth = colWidth
+	tbl.AddRow("REVISION", "UPDATED", "STATUS", "CHART", "DESCRIPTION")
+	for i := 0; i <= len(releases)-1; i++ {
+		r := releases[i]
+		tbl.AddRow(r.Revision, r.Updated, r.Status, r.Chart, r.Description)
 	}
-	return tbl.String()
+	return tbl.Bytes()
 }
 
 func formatChartname(c *chart.Chart) string {

cmd/helm/history_test.go

@@ -63,6 +63,26 @@ func TestHistoryCmd(t *testing.T) {
 			},
 			xout: "REVISION\tUPDATED                 \tSTATUS    \tCHART           \tDESCRIPTION \n3       \t(.*)\tSUPERSEDED\tfoo-0.1.0-beta.1\tRelease mock\n4       \t(.*)\tDEPLOYED  \tfoo-0.1.0-beta.1\tRelease mock\n",
 		},
+		{
+			cmds: "helm history --max=MAX RELEASE_NAME -o yaml",
+			desc: "get history with yaml output format",
+			args: []string{"--max=2", "-o=yaml", "angry-bird"},
+			resp: []*rpb.Release{
+				mk("angry-bird", 4, rpb.Status_DEPLOYED),
+				mk("angry-bird", 3, rpb.Status_SUPERSEDED),
+			},
+			xout: "- chart: foo-0.1.0-beta.1\n  description: Release mock\n  revision: 3\n  status: SUPERSEDED\n  updated: (.*)\n- chart: foo-0.1.0-beta.1\n  description: Release mock\n  revision: 4\n  status: DEPLOYED\n  updated: (.*)\n\n",
+		},
+		{
+			cmds: "helm history --max=MAX RELEASE_NAME -o json",
+			desc: "get history with json output format",
+			args: []string{"--max=2", "-o=json", "angry-bird"},
+			resp: []*rpb.Release{
+				mk("angry-bird", 4, rpb.Status_DEPLOYED),
+				mk("angry-bird", 3, rpb.Status_SUPERSEDED),
+			},
+			xout: `[{"revision":3,"updated":".*","status":"SUPERSEDED","chart":"foo\-0.1.0-beta.1","description":"Release mock"},{"revision":4,"updated":".*","status":"DEPLOYED","chart":"foo\-0.1.0-beta.1","description":"Release mock"}]\n`,
+		},
 	}
 
 	var buf bytes.Buffer

docs/helm/helm_history.md

@@ -30,6 +30,7 @@ helm history [flags] RELEASE_NAME
 ```
       --col-width uint       specifies the max column width of output (default 60)
       --max int32            maximum number of revision to include in history (default 256)
+  -o, --output string        prints the output in the specified format ('json' or 'yaml' or defaults to 'table')
       --tls                  enable TLS for request
       --tls-ca-cert string   path to TLS CA certificate file (default "$HELM_HOME/ca.pem")
       --tls-cert string      path to TLS certificate file (default "$HELM_HOME/cert.pem")
@@ -51,4 +52,4 @@ helm history [flags] RELEASE_NAME
 ### SEE ALSO
 * [helm](helm.md)	 - The Helm package manager for Kubernetes.
 
-###### Auto generated by spf13/cobra on 8-Mar-2018
+###### Auto generated by spf13/cobra on 9-Mar-2018