/* Copyright 2016 The Kubernetes Authors. 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 templates import ( "bytes" "fmt" "strings" "text/template" "unicode" "github.com/spf13/cobra" flag "github.com/spf13/pflag" "k8s.io/kubectl/pkg/util/term" ) type FlagExposer interface { ExposeFlags(cmd *cobra.Command, flags ...string) FlagExposer } func ActsAsRootCommand(cmd *cobra.Command, filters []string, groups ...CommandGroup) FlagExposer { if cmd == nil { panic("nil root command") } templater := &templater{ RootCmd: cmd, UsageTemplate: MainUsageTemplate(), HelpTemplate: MainHelpTemplate(), CommandGroups: groups, Filtered: filters, } cmd.SetFlagErrorFunc(templater.FlagErrorFunc()) cmd.SilenceUsage = true cmd.SetUsageFunc(templater.UsageFunc()) cmd.SetHelpFunc(templater.HelpFunc()) return templater } func UseOptionsTemplates(cmd *cobra.Command) { templater := &templater{ UsageTemplate: OptionsUsageTemplate(), HelpTemplate: OptionsHelpTemplate(), } cmd.SetUsageFunc(templater.UsageFunc()) cmd.SetHelpFunc(templater.HelpFunc()) } type templater struct { UsageTemplate string HelpTemplate string RootCmd *cobra.Command CommandGroups Filtered []string } func (templater *templater) FlagErrorFunc(exposedFlags ...string) func(*cobra.Command, error) error { return func(c *cobra.Command, err error) error { c.SilenceUsage = true switch c.CalledAs() { case "options": return fmt.Errorf("%s\nRun '%s' without flags.", err, c.CommandPath()) default: return fmt.Errorf("%s\nSee '%s --help' for usage.", err, c.CommandPath()) } } } func (templater *templater) ExposeFlags(cmd *cobra.Command, flags ...string) FlagExposer { cmd.SetUsageFunc(templater.UsageFunc(flags...)) return templater } func (templater *templater) HelpFunc() func(*cobra.Command, []string) { return func(c *cobra.Command, s []string) { t := template.New("help") t.Funcs(templater.templateFuncs()) template.Must(t.Parse(templater.HelpTemplate)) out := term.NewResponsiveWriter(c.OutOrStdout()) err := t.Execute(out, c) if err != nil { c.Println(err) } } } func (templater *templater) UsageFunc(exposedFlags ...string) func(*cobra.Command) error { return func(c *cobra.Command) error { t := template.New("usage") t.Funcs(templater.templateFuncs(exposedFlags...)) template.Must(t.Parse(templater.UsageTemplate)) out := term.NewResponsiveWriter(c.OutOrStderr()) return t.Execute(out, c) } } func (templater *templater) templateFuncs(exposedFlags ...string) template.FuncMap { return template.FuncMap{ "trim": strings.TrimSpace, "trimRight": func(s string) string { return strings.TrimRightFunc(s, unicode.IsSpace) }, "trimLeft": func(s string) string { return strings.TrimLeftFunc(s, unicode.IsSpace) }, "gt": cobra.Gt, "eq": cobra.Eq, "rpad": rpad, "appendIfNotPresent": appendIfNotPresent, "flagsNotIntersected": flagsNotIntersected, "visibleFlags": visibleFlags, "flagsUsages": flagsUsages, "cmdGroups": templater.cmdGroups, "cmdGroupsString": templater.cmdGroupsString, "rootCmd": templater.rootCmdName, "isRootCmd": templater.isRootCmd, "optionsCmdFor": templater.optionsCmdFor, "usageLine": templater.usageLine, "reverseParentsNames": templater.reverseParentsNames, "exposed": func(c *cobra.Command) *flag.FlagSet { exposed := flag.NewFlagSet("exposed", flag.ContinueOnError) if len(exposedFlags) > 0 { for _, name := range exposedFlags { if flag := c.Flags().Lookup(name); flag != nil { exposed.AddFlag(flag) } } } return exposed }, } } func (templater *templater) cmdGroups(c *cobra.Command, all []*cobra.Command) []CommandGroup { if len(templater.CommandGroups) > 0 && c == templater.RootCmd { all = filter(all, templater.Filtered...) return AddAdditionalCommands(templater.CommandGroups, "Other Commands:", all) } all = filter(all, "options") return []CommandGroup{ { Message: "Available Commands:", Commands: all, }, } } func (t *templater) cmdGroupsString(c *cobra.Command) string { groups := []string{} for _, cmdGroup := range t.cmdGroups(c, c.Commands()) { cmds := []string{cmdGroup.Message} for _, cmd := range cmdGroup.Commands { if cmd.IsAvailableCommand() { cmds = append(cmds, " "+rpad(cmd.Name(), cmd.NamePadding())+" "+cmd.Short) } } groups = append(groups, strings.Join(cmds, "\n")) } return strings.Join(groups, "\n\n") } func (t *templater) rootCmdName(c *cobra.Command) string { return t.rootCmd(c).CommandPath() } func (t *templater) reverseParentsNames(c *cobra.Command) []string { reverseParentsNames := []string{} parents := t.parents(c) for i := len(parents) - 1; i >= 0; i-- { reverseParentsNames = append(reverseParentsNames, parents[i].Name()) } return reverseParentsNames } func (t *templater) isRootCmd(c *cobra.Command) bool { return t.rootCmd(c) == c } func (t *templater) parents(c *cobra.Command) []*cobra.Command { parents := []*cobra.Command{c} for current := c; !t.isRootCmd(current) && current.HasParent(); { current = current.Parent() parents = append(parents, current) } return parents } func (t *templater) rootCmd(c *cobra.Command) *cobra.Command { if c != nil && !c.HasParent() { return c } if t.RootCmd == nil { panic("nil root cmd") } return t.RootCmd } func (t *templater) optionsCmdFor(c *cobra.Command) string { if !c.Runnable() { return "" } rootCmdStructure := t.parents(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 (t *templater) usageLine(c *cobra.Command) string { usage := c.UseLine() suffix := "[options]" if c.HasFlags() && !strings.Contains(usage, suffix) { usage += " " + suffix } return usage } // flagsUsages will print out the kubectl help flags func flagsUsages(f *flag.FlagSet) (string, error) { flagBuf := new(bytes.Buffer) wrapLimit, err := term.GetWordWrapperLimit() if err != nil { wrapLimit = 0 } printer := NewHelpFlagPrinter(flagBuf, wrapLimit) f.VisitAll(func(flag *flag.Flag) { if flag.Hidden { return } printer.PrintHelpFlag(flag) }) return flagBuf.String(), nil } // getFlagFormat will output the flag format func getFlagFormat(f *flag.Flag) string { var format string format = "--%s=%s:\n%s%s" if f.Value.Type() == "string" { format = "--%s='%s':\n%s%s" } if len(f.Shorthand) > 0 { format = " -%s, " + format } else { format = " %s" + format } return format } func rpad(s string, padding int) string { template := fmt.Sprintf("%%-%ds", padding) return fmt.Sprintf(template, s) } func appendIfNotPresent(s, stringToAppend string) string { if strings.Contains(s, stringToAppend) { return s } return s + " " + stringToAppend } 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 } func visibleFlags(l *flag.FlagSet) *flag.FlagSet { hidden := "help" f := flag.NewFlagSet("visible", flag.ContinueOnError) l.VisitAll(func(flag *flag.Flag) { if flag.Name != hidden { f.AddFlag(flag) } }) return f } func filter(cmds []*cobra.Command, names ...string) []*cobra.Command { out := []*cobra.Command{} for _, c := range cmds { if c.Hidden { continue } skip := false for _, name := range names { if name == c.Name() { skip = true break } } if skip { continue } out = append(out, c) } return out }