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guidecmd.go
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guidecmd.go
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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package commands
import (
"bytes"
"fmt"
"os"
"text/template"
"github.com/GoogleContainerTools/kpt/internal/guides/generated/consumer"
"github.com/GoogleContainerTools/kpt/internal/guides/generated/ecosystem"
"github.com/GoogleContainerTools/kpt/internal/guides/generated/producer"
"github.com/spf13/cobra"
)
type guideInfo struct {
Name string
Description string
Content string
}
var (
guides = map[string][]guideInfo{
"consumer": {
{
Name: "Get",
Description: "Get a remote package",
Content: consumer.GetGuide,
},
{
Name: "Update",
Description: "Update a local package",
Content: consumer.UpdateGuide,
},
{
Name: "Set",
Description: "Set field values",
Content: consumer.SetGuide,
},
{
Name: "Substitute",
Description: "Substitute values into fields",
Content: consumer.SubstituteGuide,
},
{
Name: "Display",
Description: "Display local package contents",
Content: consumer.DisplayGuide,
},
{
Name: "Apply",
Description: "Apply a local package",
Content: consumer.ApplyGuide,
},
{
Name: "Function",
Description: "Running functions",
Content: consumer.FunctionGuide,
},
},
"producer": {
{
Name: "Init",
Description: "Init",
Content: producer.InitGuide,
},
{
Name: "Setters",
Description: "Create setters",
Content: producer.SettersGuide,
},
{
Name: "Substitutions",
Description: "Create substitutions",
Content: producer.SubstitutionsGuide,
},
{
Name: "Blueprints",
Description: "Publishing a blueprint",
Content: producer.BlueprintGuide,
},
{
Name: "Variants",
Description: "Publishing variants",
Content: producer.VariantGuide,
},
{
Name: "Bootstrapping",
Description: "Bootstrapping",
Content: producer.BootstrapGuide,
},
},
"ecosystem": {
{
Name: "Kustomize",
Description: "Kustomize",
Content: ecosystem.KustomizeGuide,
},
{
Name: "Helm",
Description: "Helm",
Content: ecosystem.HelmGuide,
},
},
}
)
func GetGuideCommand(name string) *cobra.Command {
guide := &cobra.Command{
Use: "guide [NAME]",
Short: `Print kpt guides`,
Long: getLongDescription(),
Args: cobra.MaximumNArgs(1),
Example: `
# Print the Apply tutorial
kpt guide Apply`,
RunE: func(cmd *cobra.Command, args []string) error {
name := args[0]
guide, found := findGuide(name)
if !found {
fmt.Fprintf(cmd.ErrOrStderr(), "unknown guide %q\n", name)
os.Exit(1)
}
fmt.Fprintf(cmd.OutOrStdout(), guide.Content)
return nil
},
}
return guide
}
func findGuide(name string) (guideInfo, bool) {
for _, gs := range guides {
for _, g := range gs {
if g.Name == name {
return g, true
}
}
}
return guideInfo{}, false
}
func getLongDescription() string {
tmpl := template.Must(template.New("longdesc").Parse(`
The kpt guides provide walkthroughs of common kpt workflows.
The following guides are available:
Package Consumers:
{{ range .consumer -}}
- {{ .Name }}: {{ .Description }}
{{ end }}
Package Publishers:
{{ range .producer -}}
- {{ .Name }}: {{ .Description }}
{{ end }}
Ecosystem:
{{ range .ecosystem -}}
- {{ .Name }}: {{ .Description }}
{{ end }}
`))
var b bytes.Buffer
err := tmpl.Execute(&b, guides)
if err != nil {
panic(err)
}
return b.String()
}