Refactor podman pods to report.Formatter

[NO NEW TESTS NEEDED]

Support better compatibility output for podman pods commands

See #10974
Depends on containers/common#831

Signed-off-by: Jhon Honce <jhonce@redhat.com>

3 files changed, 74 insertions, 89 deletions

diff --git a/cmd/podman/pods/inspect.go b/cmd/podman/pods/inspect.go
index d4b8df90e..fd34d255f 100644
--- a/cmd/podman/pods/inspect.go
+++ b/cmd/podman/pods/inspect.go
@@ -3,6 +3,7 @@ package pods
 import (
 	"context"
 	"os"
+	"text/template"
 
 	"github.com/containers/common/pkg/report"
 	"github.com/containers/podman/v3/cmd/podman/common"
@@ -64,25 +65,17 @@ func inspect(cmd *cobra.Command, args []string) error {
 	}
 
 	if report.IsJSON(inspectOptions.Format) {
-		json.MarshalIndent(responses, "", "     ")
 		enc := json.NewEncoder(os.Stdout)
 		enc.SetIndent("", "     ")
 		return enc.Encode(responses)
 	}
 
-	// cmd.Flags().Changed("format") must be true to reach this code
-	row := report.NormalizeFormat(inspectOptions.Format)
-
-	t, err := report.NewTemplate("inspect").Parse(row)
-	if err != nil {
-		return err
-	}
-
-	w, err := report.NewWriterDefault(os.Stdout)
+	// Cannot use report.New() as it enforces {{range .}} for OriginUser templates
+	tmpl := template.New(cmd.Name()).Funcs(template.FuncMap(report.DefaultFuncs))
+	format := report.NormalizeFormat(inspectOptions.Format)
+	tmpl, err = tmpl.Parse(format)
 	if err != nil {
 		return err
 	}
-	err = t.Execute(w, *responses)
-	w.Flush()
-	return err
+	return tmpl.Execute(os.Stdout, *responses)
 }
diff --git a/cmd/podman/pods/ps.go b/cmd/podman/pods/ps.go
index 808ec31b3..0b1c76cb2 100644
--- a/cmd/podman/pods/ps.go
+++ b/cmd/podman/pods/ps.go
@@ -110,56 +110,49 @@ func pods(cmd *cobra.Command, _ []string) error {
 		return nil
 	}
 
-	// Formatted output below
 	lpr := make([]ListPodReporter, 0, len(responses))
 	for _, r := range responses {
 		lpr = append(lpr, ListPodReporter{r})
 	}
 
-	headers := report.Headers(ListPodReporter{}, map[string]string{
-		"Id":                 "POD ID",
-		"Name":               "NAME",
-		"Status":             "STATUS",
-		"Labels":             "LABELS",
-		"NumberOfContainers": "# OF CONTAINERS",
-		"Created":            "CREATED",
-		"InfraID":            "INFRA ID",
-		"ContainerIds":       "IDS",
-		"ContainerNames":     "NAMES",
-		"ContainerStatuses":  "STATUS",
-		"Cgroup":             "CGROUP",
-		"Namespace":          "NAMESPACES",
-	})
-	renderHeaders := true
-	row := podPsFormat()
-	if cmd.Flags().Changed("format") {
-		renderHeaders = report.HasTable(psInput.Format)
-		row = report.NormalizeFormat(psInput.Format)
-	}
-	format := report.EnforceRange(row)
+	rpt := report.New(os.Stdout, cmd.Name())
+	defer rpt.Flush()
 
-	noHeading, _ := cmd.Flags().GetBool("noheading")
-	if noHeading {
-		renderHeaders = false
+	if cmd.Flags().Changed("format") {
+		rpt, err = rpt.Parse(report.OriginUser, psInput.Format)
+	} else {
+		rpt, err = rpt.Parse(report.OriginPodman, podPsFormat())
 	}
-
-	tmpl, err := report.NewTemplate("list").Parse(format)
 	if err != nil {
 		return err
 	}
 
-	w, err := report.NewWriterDefault(os.Stdout)
-	if err != nil {
-		return err
+	renderHeaders := true
+	if noHeading, _ := cmd.Flags().GetBool("noheading"); noHeading {
+		renderHeaders = false
 	}
-	defer w.Flush()
 
-	if renderHeaders {
-		if err := tmpl.Execute(w, headers); err != nil {
+	if renderHeaders && rpt.RenderHeaders {
+		headers := report.Headers(ListPodReporter{}, map[string]string{
+			"Id":                 "POD ID",
+			"Name":               "NAME",
+			"Status":             "STATUS",
+			"Labels":             "LABELS",
+			"NumberOfContainers": "# OF CONTAINERS",
+			"Created":            "CREATED",
+			"InfraID":            "INFRA ID",
+			"ContainerIds":       "IDS",
+			"ContainerNames":     "NAMES",
+			"ContainerStatuses":  "STATUS",
+			"Cgroup":             "CGROUP",
+			"Namespace":          "NAMESPACES",
+		})
+
+		if err := rpt.Execute(headers); err != nil {
 			return err
 		}
 	}
-	return tmpl.Execute(w, lpr)
+	return rpt.Execute(lpr)
 }
 
 func podPsFormat() string {
@@ -184,7 +177,7 @@ func podPsFormat() string {
 	if !psInput.CtrStatus && !psInput.CtrNames && !psInput.CtrIds {
 		row = append(row, "{{.NumberOfContainers}}")
 	}
-	return strings.Join(row, "\t") + "\n"
+	return "{{range . }}" + strings.Join(row, "\t") + "\n" + "{{end -}}"
 }
 
 // ListPodReporter is a struct for pod ps output
diff --git a/cmd/podman/pods/stats.go b/cmd/podman/pods/stats.go
index a7bba3064..fbb9e0b52 100644
--- a/cmd/podman/pods/stats.go
+++ b/cmd/podman/pods/stats.go
@@ -67,15 +67,22 @@ func stats(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	doJSON := report.IsJSON(cmd.Flag("format").Value.String())
-	headers := report.Headers(entities.PodStatsReport{}, map[string]string{
-		"CPU":           "CPU %",
-		"MemUsage":      "MEM USAGE/ LIMIT",
-		"MemUsageBytes": "MEM USAGE/ LIMIT",
-		"MEM":           "MEM %",
-		"NET IO":        "NET IO",
-		"BlockIO":       "BLOCK IO",
-	})
+	rpt := report.New(os.Stdout, cmd.Name())
+	defer rpt.Flush()
+
+	var err error
+	doJSON := report.IsJSON(statsOptions.Format)
+	if !doJSON {
+		if cmd.Flags().Changed("format") {
+			rpt, err = rpt.Parse(report.OriginUser, statsOptions.Format)
+			if err != nil {
+				return err
+			}
+		} else {
+			rpt = rpt.Init(os.Stdout, 12, 2, 2, ' ', 0)
+			rpt.Origin = report.OriginPodman
+		}
+	}
 
 	for ; ; time.Sleep(time.Second) {
 		reports, err := registry.ContainerEngine().PodStats(context.Background(), args, statsOptions.PodStatsOptions)
@@ -84,30 +91,26 @@ func stats(cmd *cobra.Command, args []string) error {
 		}
 		// Print the stats in the requested format and configuration.
 		if doJSON {
-			if err := printJSONPodStats(reports); err != nil {
-				return err
-			}
+			err = printJSONPodStats(reports)
 		} else {
 			if !statsOptions.NoReset {
 				goterm.Clear()
 				goterm.MoveCursor(1, 1)
 				goterm.Flush()
 			}
-			if cmd.Flags().Changed("format") {
-				row := report.NormalizeFormat(statsOptions.Format)
-				row = report.EnforceRange(row)
-				if err := printFormattedPodStatsLines(headers, row, reports); err != nil {
-					return err
-				}
+			if report.OriginUser == rpt.Origin {
+				err = userTemplate(rpt, reports)
 			} else {
-				printPodStatsLines(reports)
+				err = defaultTemplate(rpt, reports)
 			}
 		}
+		if err != nil {
+			return err
+		}
 		if statsOptions.NoStream {
 			break
 		}
 	}
-
 	return nil
 }
 
@@ -120,42 +123,38 @@ func printJSONPodStats(stats []*entities.PodStatsReport) error {
 	return nil
 }
 
-func printPodStatsLines(stats []*entities.PodStatsReport) error {
-	w, err := report.NewWriterDefault(os.Stdout)
-	if err != nil {
-		return err
-	}
-
+func defaultTemplate(rpt *report.Formatter, stats []*entities.PodStatsReport) error {
 	outFormat := "%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\n"
-	fmt.Fprintf(w, outFormat, "POD", "CID", "NAME", "CPU %", "MEM USAGE/ LIMIT", "MEM %", "NET IO", "BLOCK IO", "PIDS")
+	fmt.Fprintf(rpt.Writer(), outFormat, "POD", "CID", "NAME", "CPU %", "MEM USAGE/ LIMIT", "MEM %", "NET IO", "BLOCK IO", "PIDS")
 	if len(stats) == 0 {
-		fmt.Fprintf(w, outFormat, "--", "--", "--", "--", "--", "--", "--", "--", "--")
+		fmt.Fprintf(rpt.Writer(), outFormat, "--", "--", "--", "--", "--", "--", "--", "--", "--")
 	} else {
 		for _, i := range stats {
-			fmt.Fprintf(w, outFormat, i.Pod, i.CID, i.Name, i.CPU, i.MemUsage, i.Mem, i.NetIO, i.BlockIO, i.PIDS)
+			fmt.Fprintf(rpt.Writer(), outFormat, i.Pod, i.CID, i.Name, i.CPU, i.MemUsage, i.Mem, i.NetIO, i.BlockIO, i.PIDS)
 		}
 	}
-	return w.Flush()
+	return rpt.Flush()
 }
 
-func printFormattedPodStatsLines(headerNames []map[string]string, row string, stats []*entities.PodStatsReport) error {
+func userTemplate(rpt *report.Formatter, stats []*entities.PodStatsReport) error {
 	if len(stats) == 0 {
 		return nil
 	}
 
-	tmpl, err := report.NewTemplate("stats").Parse(row)
-	if err != nil {
-		return err
-	}
+	headers := report.Headers(entities.PodStatsReport{}, map[string]string{
+		"CPU":           "CPU %",
+		"MemUsage":      "MEM USAGE/ LIMIT",
+		"MemUsageBytes": "MEM USAGE/ LIMIT",
+		"MEM":           "MEM %",
+		"NET IO":        "NET IO",
+		"BlockIO":       "BLOCK IO",
+	})
 
-	w, err := report.NewWriterDefault(os.Stdout)
-	if err != nil {
+	if err := rpt.Execute(headers); err != nil {
 		return err
 	}
-	defer w.Flush()
-
-	if err := tmpl.Execute(w, headerNames); err != nil {
+	if err := rpt.Execute(stats); err != nil {
 		return err
 	}
-	return tmpl.Execute(w, stats)
+	return rpt.Flush()
 }