Show the context name and current context using get-context command

The command "airshipctl config get-context" will display the name of the contexts as well as the current context name.

Relates-To: #475
Change-Id: I8234d74f6b98869e27e4974a54b68230d8be8565

cmd/config/get_context.go

@@ -59,26 +59,12 @@ func NewGetContextCommand(cfgFactory config.Factory) *cobra.Command {
 			if len(args) == 1 {
 				o.Name = args[0]
 			}
-			if o.Name == "" && !o.CurrentContext {
-				contexts := airconfig.GetContexts()
-				if len(contexts) == 0 {
+
+			if len(airconfig.GetContexts()) == 0 {
 				fmt.Fprintln(cmd.OutOrStdout(), "No Contexts found in the configuration.")
+			} else {
+				return o.Print(airconfig, cmd.OutOrStdout())
 			}
-				for _, context := range contexts {
-					fmt.Fprintln(cmd.OutOrStdout(), context.String())
-				}
-				return nil
-			}
-
-			if o.CurrentContext {
-				o.Name = airconfig.CurrentContext
-			}
-
-			context, err := airconfig.GetContext(o.Name)
-			if err != nil {
-				return err
-			}
-			fmt.Fprintln(cmd.OutOrStdout(), context.String())
 			return nil
 		},
 	}
@@ -95,4 +81,10 @@ func addGetContextFlags(o *config.ContextOptions, cmd *cobra.Command) {
 		"current",
 		false,
 		"get the current context")
+
+	flags.StringVar(
+		&o.Format,
+		"format",
+		"yaml",
+		"choose between `yaml` or `table`, default is `yaml`")
 }

cmd/config/get_context_test.go

@@ -94,6 +94,5 @@ func getNamedTestContext(contextName string) *config.Context {
 	newContext := &config.Context{
 		Manifest: fmt.Sprintf("Manifest_%s", contextName),
 	}
-
 	return newContext
 }

cmd/config/testdata/TestGetContextCmdGoldenOutput/get-all-contexts.golden

@@ -1,3 +1,4 @@
-managementConfiguration: ""
-manifest: Manifest_ContextBar
-
+contexts:
+  ContextBar:
+    managementConfiguration: ""
+    manifest: Manifest_ContextBar

cmd/config/testdata/TestGetContextCmdGoldenOutput/get-context.golden

@@ -1,3 +1,4 @@
-managementConfiguration: ""
-manifest: Manifest_ContextFoo
-
+contexts:
+  ContextFoo:
+    managementConfiguration: ""
+    manifest: Manifest_ContextFoo

cmd/config/testdata/TestGetContextCmdGoldenOutput/get-current-context.golden

@@ -1,3 +1,4 @@
-managementConfiguration: ""
-manifest: Manifest_ContextBaz
-
+contexts:
+  ContextBaz:
+    managementConfiguration: ""
+    manifest: Manifest_ContextBaz

cmd/config/testdata/TestGetContextCmdGoldenOutput/get-multiple-contexts.golden

@@ -19,5 +19,6 @@ airshipctl config get-context exampleContext
 
 Flags:
       --current       get the current context
+      --format yaml   choose between yaml or `table`, default is `yaml` (default "yaml")
   -h, --help          help for get-context
 

cmd/config/testdata/TestGetContextCmdGoldenOutput/missing.golden

@@ -19,5 +19,6 @@ airshipctl config get-context exampleContext
 
 Flags:
       --current       get the current context
+      --format yaml   choose between yaml or `table`, default is `yaml` (default "yaml")
   -h, --help          help for get-context
 

docs/source/cli/airshipctl_config_get-context.md

@@ -30,6 +30,7 @@ airshipctl config get-context exampleContext
 
 ```
       --current       get the current context
+      --format yaml   choose between yaml or `table`, default is `yaml` (default "yaml")
   -h, --help          help for get-context
 ```
 

docs/source/cli/airshipctl_document_pull.md

@@ -11,6 +11,7 @@ By default the airship config file is initialized with the
 repository "https://opendev.org/airship/treasuremap" as a source of
 manifests and with the manifests target path "$HOME/.airship/default".
 
+
 ```
 airshipctl document pull [flags]
 ```

pkg/config/errors.go

@@ -276,3 +276,13 @@ type ErrConfigFileExists struct {
 func (e ErrConfigFileExists) Error() string {
 	return fmt.Sprintf("could not create default config at %s, file already exists", e.Path)
 }
+
+// ErrWrongOutputFormat is returned when unknown output format is defined for printing config
+type ErrWrongOutputFormat struct {
+	Wrong    string
+	Possible []string
+}
+
+func (e ErrWrongOutputFormat) Error() string {
+	return fmt.Sprintf("wrong output format %s, must be one of %s", e.Wrong, strings.Join(e.Possible, " "))
+}

pkg/config/options.go

@@ -15,6 +15,14 @@ limitations under the License.
 package config
 
 import (
+	"fmt"
+	"io"
+	"sort"
+	"strings"
+
+	"k8s.io/cli-runtime/pkg/printers"
+	"sigs.k8s.io/yaml"
+
 	"opendev.org/airship/airshipctl/pkg/errors"
 )
 
@@ -25,6 +33,7 @@ type ContextOptions struct {
 	Manifest                string
 	Current                 bool
 	ManagementConfiguration string
+	Format                  string
 }
 
 // ManifestOptions holds all configurable options for manifest configuration
@@ -67,6 +76,76 @@ func (o *ContextOptions) Validate() error {
 	return nil
 }
 
+// Print prints the config contexts using one of formats `yaml` or `table` to a given output
+func (o *ContextOptions) Print(cfg *Config, w io.Writer) error {
+	if o.CurrentContext {
+		o.Name = cfg.CurrentContext
+	}
+
+	switch o.Format {
+	case "yaml":
+		type reducedConfig struct {
+			Contexts       map[string]*Context `json:"contexts"`
+			CurrentContext string              `json:"currentContext,omitempty"`
+		}
+		contexts := &reducedConfig{
+			Contexts:       cfg.Contexts,
+			CurrentContext: cfg.CurrentContext,
+		}
+		if o.Name != "" {
+			c, err := cfg.GetContext(o.Name)
+			if err != nil {
+				return err
+			}
+			contexts = &reducedConfig{
+				Contexts: map[string]*Context{o.Name: c},
+			}
+		}
+		data, err := yaml.Marshal(contexts)
+		if err != nil {
+			return err
+		}
+		fmt.Fprintf(w, string(data))
+	case "table":
+		out := printers.GetNewTabWriter(w)
+		defer out.Flush()
+
+		toPrint := []string{}
+		if o.Name != "" {
+			toPrint = append(toPrint, o.Name)
+		} else {
+			for name := range cfg.Contexts {
+				toPrint = append(toPrint, name)
+			}
+		}
+
+		columnNames := []string{"CURRENT", "NAME", "MANIFEST", "MANAGEMENTCONFIGURATION"}
+		_, err := fmt.Fprintf(out, "%s\n", strings.Join(columnNames, "\t"))
+		if err != nil {
+			return err
+		}
+
+		sort.Strings(toPrint)
+		for _, name := range toPrint {
+			prefix := " "
+			if cfg.CurrentContext == name {
+				prefix = "*"
+			}
+			context, err := cfg.GetContext(name)
+			if err != nil {
+				return err
+			}
+			_, err = fmt.Fprintf(out, "%s\t%s\t%s\t%s\n", prefix, name, context.Manifest, context.ManagementConfiguration)
+			if err != nil {
+				return err
+			}
+		}
+	default:
+		return ErrWrongOutputFormat{Wrong: o.Format, Possible: []string{"yaml", "table"}}
+	}
+	return nil
+}
+
 // Validate checks for the possible manifest option values and returns
 // Error when invalid value or incompatible choice of values given
 func (o *ManifestOptions) Validate() error {

pkg/config/options_test.go

@@ -15,13 +15,22 @@ limitations under the License.
 package config_test
 
 import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 
 	"opendev.org/airship/airshipctl/pkg/config"
 )
 
+const (
+	testFormatError       = "wrong output format , must be one of yaml table"
+	defaultCurrentContext = "a-context"
+)
+
 func TestContextOptionsValidate(t *testing.T) {
 	tests := []struct {
 		name        string
@@ -64,3 +73,128 @@ func TestContextOptionsValidate(t *testing.T) {
 		})
 	}
 }
+func TestContextOptionsPrint(t *testing.T) {
+	yamlOutput := `contexts:
+  a-context:
+    managementConfiguration: a-manageconf
+    manifest: a-manifest
+currentContext: a-context
+`
+	tests := []struct {
+		name               string
+		testContextOptions config.ContextOptions
+		testConfig         config.Config
+		expectedOutput     string
+		expectedErr        string
+	}{
+		{
+			name: "Wrong output format",
+			testContextOptions: config.ContextOptions{
+				Format: "",
+			},
+			testConfig:     config.Config{},
+			expectedOutput: "",
+			expectedErr:    testFormatError,
+		},
+		{
+			name: "List contexts in table format",
+			testContextOptions: config.ContextOptions{
+				Name:           "",
+				CurrentContext: false,
+				Format:         "table",
+			},
+			testConfig: config.Config{
+				CurrentContext: defaultCurrentContext,
+				Contexts: map[string]*config.Context{
+					"a-context": {Manifest: "a-manifest", ManagementConfiguration: "a-manageconf"},
+					"b-context": {Manifest: "b-manifest", ManagementConfiguration: "b-manageconf"}},
+			},
+			expectedOutput: `CURRENT   NAME        MANIFEST     MANAGEMENTCONFIGURATION
+*         a-context   a-manifest   a-manageconf
+          b-context   b-manifest   b-manageconf
+`,
+		},
+		{
+			name: "List contexts in table format(Context name is given)",
+			testContextOptions: config.ContextOptions{
+				Name:           defaultCurrentContext,
+				CurrentContext: false,
+				Format:         "table",
+			},
+			testConfig: config.Config{
+				CurrentContext: defaultCurrentContext,
+				Contexts: map[string]*config.Context{
+					"a-context": {Manifest: "a-manifest", ManagementConfiguration: "a-manageconf"},
+					"b-context": {Manifest: "b-manifest", ManagementConfiguration: "b-manageconf"}},
+			},
+			expectedOutput: `CURRENT   NAME        MANIFEST     MANAGEMENTCONFIGURATION
+*         a-context   a-manifest   a-manageconf
+`,
+		},
+		{
+			name: "List contexts in table format(CurrentContext is true)",
+			testContextOptions: config.ContextOptions{
+				Name:           "",
+				CurrentContext: true,
+				Format:         "table",
+			},
+			testConfig: config.Config{
+				CurrentContext: defaultCurrentContext,
+				Contexts: map[string]*config.Context{
+					"a-context": {Manifest: "a-manifest", ManagementConfiguration: "a-manageconf"},
+					"b-context": {Manifest: "b-manifest", ManagementConfiguration: "b-manageconf"}},
+			},
+			expectedOutput: `CURRENT   NAME        MANIFEST     MANAGEMENTCONFIGURATION
+*         a-context   a-manifest   a-manageconf
+`,
+		},
+		{
+			name: "List contexts in table format(Wrong Name is given)",
+			testContextOptions: config.ContextOptions{
+				Name:           "wrong-context",
+				CurrentContext: false,
+				Format:         "table",
+			},
+			testConfig: config.Config{
+				CurrentContext: defaultCurrentContext,
+				Contexts: map[string]*config.Context{
+					"a-context": {Manifest: "a-manifest", ManagementConfiguration: "a-manageconf"},
+					"b-context": {Manifest: "b-manifest", ManagementConfiguration: "b-manageconf"}},
+			},
+			expectedOutput: `CURRENT   NAME   MANIFEST   MANAGEMENTCONFIGURATION
+`,
+			expectedErr: "context with name 'wrong-context'",
+		},
+		{
+			name: "List contexts in yaml format",
+			testContextOptions: config.ContextOptions{
+				Name:           "",
+				CurrentContext: false,
+				Format:         "yaml",
+			},
+			testConfig: config.Config{
+				CurrentContext: defaultCurrentContext,
+				Contexts: map[string]*config.Context{
+					"a-context": {Manifest: "a-manifest", ManagementConfiguration: "a-manageconf"}},
+			},
+			expectedOutput: yamlOutput,
+		},
+	}
+	for _, tc := range tests {
+		tt := tc
+		t.Run(tt.name, func(t *testing.T) {
+			buf := &bytes.Buffer{}
+			err := tt.testContextOptions.Print(&tt.testConfig, buf)
+			if tt.expectedErr != "" {
+				require.Error(t, err)
+				assert.Contains(t, err.Error(), tt.expectedErr)
+			} else {
+				assert.NoError(t, err)
+			}
+			out, err := ioutil.ReadAll(buf)
+			fmt.Print(string(out))
+			require.NoError(t, err)
+			assert.Equal(t, tt.expectedOutput, string(out))
+		})
+	}
+}