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command_group.go
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command_group.go
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package cli
import (
"os"
"strconv"
"github.com/moby/term"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"github.com/telepresenceio/telepresence/v2/pkg/client/cli/cliutil"
)
var userDaemonRunning = false
var commandGroupMap = make(map[string]cliutil.CommandGroups)
var globalFlagGroups []cliutil.FlagGroup
var deprecatedGlobalFlags *pflag.FlagSet
func init() {
cobra.AddTemplateFunc("commandGroups", func(cmd *cobra.Command) cliutil.CommandGroups {
return commandGroupMap[cmd.Name()]
})
cobra.AddTemplateFunc("globalFlagGroups", func() []cliutil.FlagGroup {
return globalFlagGroups
})
cobra.AddTemplateFunc("userDaemonRunning", func() bool {
return userDaemonRunning
})
cobra.AddTemplateFunc("wrappedFlagUsages", func(flags *pflag.FlagSet) string {
// This is based off of what Docker does (github.com/docker/cli/cli/cobra.go), but is
// adjusted
// 1. to take a pflag.FlagSet instead of a cobra.Command, so that we can have flag groups, and
// 2. to correct for the ways that Docker upsets me.
var cols int
var err error
// Obey COLUMNS if the shell or user sets it. (Docker doesn't do this.)
if cols, err = strconv.Atoi(os.Getenv("COLUMNS")); err == nil {
goto end
}
// Try to detect the size of the stdout file descriptor. (Docker checks stdin, not stdout.)
if ws, err := term.GetWinsize(1); err == nil {
cols = int(ws.Width)
goto end
}
// If stdout is a terminal but we were unable to get its size (I'm not sure how that can
// happen), then fall back to assuming 80. If stdou tisn't a terminal, then we leave cols
// as 0, meaning "don't wrap it". (Docker wraps it even if stdout isn't a terminal.)
if term.IsTerminal(1) {
cols = 80
goto end
}
end:
return flags.FlagUsagesWrapped(cols)
})
}
func setCommandGroups(cmd *cobra.Command, groups cliutil.CommandGroups) {
commandGroupMap[cmd.Name()] = groups
}
// AddCommandGroups adds all the groups in the given CommandGroups to the command, replaces
// the its standard usage template with a template that groups the commands according to that group.
func AddCommandGroups(cmd *cobra.Command, groups cliutil.CommandGroups) {
for _, commands := range groups {
cmd.AddCommand(commands...)
}
setCommandGroups(cmd, groups)
// Set a usage template that is derived from the default but replaces the "Available Commands"
// section with the commandGroups() from the given command
cmd.SetUsageTemplate(`Usage:{{if and (.Runnable) (not .HasAvailableSubCommands)}}
{{.UseLine}}{{end}}{{if .HasAvailableSubCommands}}
{{.CommandPath}} [command]{{end}}{{if gt (len .Aliases) 0}}
Aliases:
{{.NameAndAliases}}{{end}}{{if .HasExample}}
Examples:
{{.Example}}{{end}}{{if .HasAvailableSubCommands}}
Available Commands{{- if not userDaemonRunning }} (list may be incomplete because the User Daemon isn't running){{- end}}:
{{- if commandGroups .}}
{{- range $name, $commands := commandGroups .}}
{{$name}}:{{range $commands}}
{{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}
{{- else}}
{{- range .Commands}}{{if (or .IsAvailableCommand (eq .Name "help"))}}
{{rpad .Name .NamePadding }} {{.Short}}{{end}}{{end}}
{{- end}}
{{- end}}
{{- if .HasAvailableLocalFlags}}
Flags:
{{.LocalNonPersistentFlags | wrappedFlagUsages | trimTrailingWhitespaces}}{{end}}{{if true}}
Global Flags:{{range $group := globalFlagGroups}}
{{$group.Name}}:
{{$group.Flags | wrappedFlagUsages | trimTrailingWhitespaces}}{{end}}{{end}}{{if .HasHelpSubCommands}}
Additional help topics:{{range .Commands}}{{if .IsAdditionalHelpTopicCommand}}
{{rpad .CommandPath .CommandPathPadding}} {{.Short}}{{end}}{{end}}{{end}}{{if .HasAvailableSubCommands}}
Use "{{.CommandPath}} [command] --help" for more information about a command.
For complete documentation and quick-start guides, check out our website at https://www.telepresence.io{{end}}
`)
}