urfave-cli/help.go
2017-04-04 13:53:15 +07:00

319 lines
7.7 KiB
Go

package cli
import (
"fmt"
"io"
"os"
"strings"
"text/tabwriter"
"text/template"
)
// AppHelpTemplate is the text template for the Default help topic.
// cli.go uses text/template to render templates. You can
// render custom help text by setting this variable.
var AppHelpTemplate = `NAME:
{{.Name}} - {{.Usage}}
USAGE:
{{if .UsageText}}{{.UsageText}}{{else}}{{.HelpName}} {{if .VisibleFlags}}[global options]{{end}}{{if .Commands}} command [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{end}}{{if .Version}}{{if not .HideVersion}}
VERSION:
{{.Version}}{{end}}{{end}}{{if .Description}}
DESCRIPTION:
{{.Description}}{{end}}{{if len .Authors}}
AUTHOR{{with $length := len .Authors}}{{if ne 1 $length}}S{{end}}{{end}}:
{{range $index, $author := .Authors}}{{if $index}}
{{end}}{{$author}}{{end}}{{end}}{{if .VisibleCommands}}
COMMANDS:{{range .VisibleCategories}}{{if .Name}}
{{.Name}}:{{end}}{{range .VisibleCommands}}
{{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}{{end}}{{end}}{{if .VisibleFlags}}
GLOBAL OPTIONS:
{{range $index, $option := .VisibleFlags}}{{if $index}}
{{end}}{{$option}}{{end}}{{end}}{{if .Copyright}}
COPYRIGHT:
{{.Copyright}}{{end}}
`
// CommandHelpTemplate is the text template for the command help topic.
// cli.go uses text/template to render templates. You can
// render custom help text by setting this variable.
var CommandHelpTemplate = `NAME:
{{.HelpName}} - {{.Usage}}
USAGE:
{{.HelpName}}{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}{{if .Category}}
CATEGORY:
{{.Category}}{{end}}{{if .Description}}
DESCRIPTION:
{{.Description}}{{end}}{{if .VisibleFlags}}
OPTIONS:
{{range .VisibleFlags}}{{.}}
{{end}}{{end}}
`
// SubcommandHelpTemplate is the text template for the subcommand help topic.
// cli.go uses text/template to render templates. You can
// render custom help text by setting this variable.
var SubcommandHelpTemplate = `NAME:
{{.HelpName}} - {{.Usage}}
USAGE:
{{.HelpName}} command{{if .VisibleFlags}} [command options]{{end}} {{if .ArgsUsage}}{{.ArgsUsage}}{{else}}[arguments...]{{end}}
COMMANDS:{{range .VisibleCategories}}{{if .Name}}
{{.Name}}:{{end}}{{range .VisibleCommands}}
{{join .Names ", "}}{{"\t"}}{{.Usage}}{{end}}
{{end}}{{if .VisibleFlags}}
OPTIONS:
{{range .VisibleFlags}}{{.}}
{{end}}{{end}}
`
var helpCommand = &Command{
Name: "help",
Aliases: []string{"h"},
Usage: "Shows a list of commands or help for one command",
ArgsUsage: "[command]",
Action: func(c *Context) error {
args := c.Args()
if args.Present() {
return ShowCommandHelp(c, args.First())
}
ShowAppHelp(c)
return nil
},
}
var helpSubcommand = &Command{
Name: "help",
Aliases: []string{"h"},
Usage: "Shows a list of commands or help for one command",
ArgsUsage: "[command]",
Action: func(c *Context) error {
args := c.Args()
if args.Present() {
return ShowCommandHelp(c, args.First())
}
return ShowSubcommandHelp(c)
},
}
// Prints help for the App or Command
type helpPrinter func(w io.Writer, templ string, data interface{})
// HelpPrinter is a function that writes the help output. If not set a default
// is used. The function signature is:
// func(w io.Writer, templ string, data interface{})
var HelpPrinter helpPrinter = printHelp
// VersionPrinter prints the version for the App
var VersionPrinter = printVersion
// ShowAppHelp is an action that displays the help.
func ShowAppHelp(c *Context) {
HelpPrinter(c.App.Writer, AppHelpTemplate, c.App)
}
// DefaultAppComplete prints the list of subcommands as the default app completion method
func DefaultAppComplete(c *Context) {
for _, command := range c.App.Commands {
if command.Hidden {
continue
}
for _, name := range command.Names() {
fmt.Fprintln(c.App.Writer, name)
}
}
}
// ShowCommandHelp prints help for the given command
func ShowCommandHelp(ctx *Context, command string) error {
// show the subcommand help for a command with subcommands
if command == "" {
HelpPrinter(ctx.App.Writer, SubcommandHelpTemplate, ctx.App)
return nil
}
for _, c := range ctx.App.Commands {
if c.HasName(command) {
HelpPrinter(ctx.App.Writer, CommandHelpTemplate, c)
return nil
}
}
if ctx.App.CommandNotFound == nil {
return Exit(fmt.Sprintf("No help topic for '%v'", command), 3)
}
ctx.App.CommandNotFound(ctx, command)
return nil
}
// ShowSubcommandHelp prints help for the given subcommand
func ShowSubcommandHelp(c *Context) error {
if c == nil {
return nil
}
if c.Command != nil {
return ShowCommandHelp(c, c.Command.Name)
}
return ShowCommandHelp(c, "")
}
// ShowVersion prints the version number of the App
func ShowVersion(c *Context) {
VersionPrinter(c)
}
func printVersion(c *Context) {
fmt.Fprintf(c.App.Writer, "%v version %v\n", c.App.Name, c.App.Version)
}
// ShowCompletions prints the lists of commands within a given context
func ShowCompletions(c *Context) {
a := c.App
if a != nil && a.ShellComplete != nil {
a.ShellComplete(c)
}
}
// ShowCommandCompletions prints the custom completions for a given command
func ShowCommandCompletions(ctx *Context, command string) {
c := ctx.App.Command(command)
if c != nil && c.ShellComplete != nil {
c.ShellComplete(ctx)
}
}
func printHelp(out io.Writer, templ string, data interface{}) {
funcMap := template.FuncMap{
"join": strings.Join,
}
w := tabwriter.NewWriter(out, 1, 8, 2, ' ', 0)
t := template.Must(template.New("help").Funcs(funcMap).Parse(templ))
errDebug := os.Getenv("CLI_TEMPLATE_ERROR_DEBUG") != ""
err := t.Execute(w, data)
if err != nil {
if errDebug {
fmt.Fprintf(ErrWriter, "CLI TEMPLATE ERROR: %#v\n", err)
}
return
}
w.Flush()
}
func checkVersion(c *Context) bool {
found := false
if VersionFlag.Name != "" {
for _, name := range VersionFlag.Names() {
if c.Bool(name) {
found = true
}
}
}
return found
}
func checkHelp(c *Context) bool {
found := false
if HelpFlag.Name != "" {
for _, name := range HelpFlag.Names() {
if c.Bool(name) {
found = true
}
}
}
return found
}
func checkCommandHelp(c *Context, name string) bool {
if c.Bool("h") || c.Bool("help") {
ShowCommandHelp(c, name)
return true
}
return false
}
func checkSubcommandHelp(c *Context) bool {
if c.Bool("h") || c.Bool("help") {
ShowSubcommandHelp(c)
return true
}
return false
}
func checkCompletions(c *Context) bool {
if c.Bool(GenerateCompletionFlag.Name) && c.App.EnableShellCompletion {
ShowCompletions(c)
return true
}
return false
}
func checkCommandCompletions(c *Context, name string) bool {
if c.Bool(GenerateCompletionFlag.Name) && c.App.EnableShellCompletion {
ShowCommandCompletions(c, name)
return true
}
return false
}
func checkInitCompletion(c *Context) (bool, error) {
if c.IsSet(InitCompletionFlag.Name) {
shell := c.String(InitCompletionFlag.Name)
progName := os.Args[0]
switch shell {
case "bash":
fmt.Print(bashCompletionCode(progName))
return true, nil
case "zsh":
fmt.Print(zshCompletionCode(progName))
return true, nil
default:
return false, fmt.Errorf("--init-completion value cannot be '%s'", shell)
}
}
return false, nil
}
func bashCompletionCode(progName string) string {
var template = `_cli_bash_autocomplete() {
local cur opts base;
COMPREPLY=();
cur="${COMP_WORDS[COMP_CWORD]}";
opts=$( ${COMP_WORDS[@]:0:$COMP_CWORD} --generate-completion );
COMPREPLY=( $(compgen -W "${opts}" -- ${cur}) );
return 0;
};
complete -F _cli_bash_autocomplete %s`
return fmt.Sprintf(template, progName)
}
func zshCompletionCode(progName string) string {
var template = `autoload -U compinit && compinit;
autoload -U bashcompinit && bashcompinit;`
return template + "\n" + bashCompletionCode(progName)
}