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templater.go
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templater.go
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package templates
import (
"bytes"
"fmt"
"strings"
"text/template"
"github.com/spf13/cobra"
flag "github.com/spf13/pflag"
)
type Templater struct {
UsageTemplate string
Exposed []string
}
func (templater *Templater) UsageFunc() func(*cobra.Command) error {
return func(c *cobra.Command) error {
t := template.New("custom")
t.Funcs(template.FuncMap{
"trim": strings.TrimSpace,
"gt": cobra.Gt,
"eq": cobra.Eq,
"rpad": rpad,
"flagsNotIntersected": flagsNotIntersected,
"flagsUsages": flagsUsages,
"rootCmd": rootCmdName,
"isRootCmd": isRootCmd,
"optionsCmdFor": optionsCmdFor,
"exposed": func(c *cobra.Command) *flag.FlagSet {
exposed := flag.NewFlagSet("exposed", flag.ContinueOnError)
if len(templater.Exposed) > 0 {
for _, name := range templater.Exposed {
if flag := c.Flags().Lookup(name); flag != nil {
exposed.AddFlag(flag)
}
}
}
return exposed
},
})
template.Must(t.Parse(templater.UsageTemplate))
return t.Execute(c.Out(), c)
}
}
func UseMainTemplates(cmd *cobra.Command) {
cmd.SetHelpTemplate(MainHelpTemplate())
templater := &Templater{UsageTemplate: MainUsageTemplate()}
cmd.SetUsageFunc(templater.UsageFunc())
}
func UseOptionsTemplates(cmd *cobra.Command) {
cmd.SetHelpTemplate(OptionsHelpTemplate())
templater := &Templater{UsageTemplate: OptionsUsageTemplate()}
cmd.SetUsageFunc(templater.UsageFunc())
}
func rootCmdNames(c *cobra.Command) []string {
cmds := rootCmds(c)
rootCmdNames := []string{}
for _, cmd := range cmds {
rootCmdNames = append(rootCmdNames, cmd.Name())
}
return rootCmdNames
}
func rootCmds(c *cobra.Command) []*cobra.Command {
root := []*cobra.Command{}
var appendCmd func(*cobra.Command)
appendCmd = func(x *cobra.Command) {
if x.HasParent() {
appendCmd(x.Parent())
root = append(root, x.Parent())
}
}
appendCmd(c)
if c.HasSubCommands() && len(root) == 1 && root[0].Name() == "openshift" && c.Name() != "openshift" {
root = append(root, c)
}
if len(root) == 0 {
root = append(root, c)
}
return root
}
func rootCmdName(c *cobra.Command) string {
return strings.Join(rootCmdNames(c), " ")
}
func isRootCmd(c *cobra.Command) bool {
r := rootCmdNames(c)
return c.HasSubCommands() && r[len(r)-1] == c.Name()
}
func optionsCmdFor(c *cobra.Command) string {
if !c.HasInheritedFlags() || !c.Runnable() {
return ""
}
rootCmdStructure := rootCmds(c)
for i := len(rootCmdStructure) - 1; i >= 0; i-- {
cmd := rootCmdStructure[i]
if _, _, err := cmd.Find([]string{"options"}); err == nil {
return cmd.CommandPath() + " options"
}
}
return ""
}
func flagsUsages(f *flag.FlagSet) string {
x := new(bytes.Buffer)
f.VisitAll(func(flag *flag.Flag) {
format := "--%s=%s: %s\n"
if flag.Value.Type() == "string" {
format = "--%s='%s': %s\n"
}
if len(flag.Shorthand) > 0 {
format = " -%s, " + format
} else {
format = " %s " + format
}
fmt.Fprintf(x, format, flag.Shorthand, flag.Name, flag.DefValue, flag.Usage)
})
return x.String()
}
func rpad(s string, padding int) string {
template := fmt.Sprintf("%%-%ds", padding)
return fmt.Sprintf(template, s)
}
func flagsNotIntersected(l *flag.FlagSet, r *flag.FlagSet) *flag.FlagSet {
f := flag.NewFlagSet("notIntersected", flag.ContinueOnError)
l.VisitAll(func(flag *flag.Flag) {
if r.Lookup(flag.Name) == nil {
f.AddFlag(flag)
}
})
return f
}