mirror of https://github.com/spf13/cobra.git
506 lines
12 KiB
Go
506 lines
12 KiB
Go
// Copyright © 2013 Steve Francia <spf@spf13.com>.
|
|
//
|
|
// 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.
|
|
|
|
// Commands similar to git, go tools and other modern CLI tools
|
|
// inspired by go, go-Commander, gh and subcommand
|
|
|
|
package cobra
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
flag "github.com/spf13/pflag"
|
|
"io"
|
|
"os"
|
|
"reflect"
|
|
"strconv"
|
|
"strings"
|
|
"text/template"
|
|
)
|
|
|
|
var _ = flag.ContinueOnError
|
|
|
|
// A Commander holds the configuration for the command line tool.
|
|
type Commander struct {
|
|
// A Commander is also a Command for top level and global help & flags
|
|
Command
|
|
|
|
args []string
|
|
output io.Writer // nil means stderr; use out() accessor
|
|
UsageFunc func(*Command) error // Usage can be defined by application
|
|
UsageTemplate string // Can be defined by Application
|
|
HelpTemplate string // Can be defined by Application
|
|
}
|
|
|
|
// Provide the user with a new commander.
|
|
func NewCommander() (c *Commander) {
|
|
c = new(Commander)
|
|
c.cmdr = c
|
|
c.UsageFunc = c.defaultUsage
|
|
c.initTemplates()
|
|
return
|
|
}
|
|
|
|
// Name for commander, should match application name
|
|
func (c *Commander) SetName(name string) {
|
|
c.name = name
|
|
}
|
|
|
|
// os.Args[1:] by default, if desired, can be overridden
|
|
// particularly useful when testing.
|
|
func (c *Commander) SetArgs(a []string) {
|
|
c.args = a
|
|
}
|
|
|
|
// Call execute to use the args (os.Args[1:] by default)
|
|
// and run through the command tree finding appropriate matches
|
|
// for commands and then corresponding flags.
|
|
func (c *Commander) Execute() (err error) {
|
|
if len(c.args) == 0 {
|
|
err = c.execute(os.Args[1:])
|
|
} else {
|
|
err = c.execute(c.args)
|
|
}
|
|
return
|
|
}
|
|
|
|
func (c *Commander) out() io.Writer {
|
|
if c.output == nil {
|
|
return os.Stderr
|
|
}
|
|
return c.output
|
|
}
|
|
|
|
func (cmdr *Commander) defaultUsage(c *Command) error {
|
|
err := tmpl(cmdr.out(), cmdr.UsageTemplate, c)
|
|
if err != nil {
|
|
c.Println(err)
|
|
}
|
|
return err
|
|
}
|
|
|
|
//Print to out
|
|
func (c *Commander) POut(i ...interface{}) {
|
|
fmt.Fprint(c.out(), i...)
|
|
}
|
|
|
|
// SetOutput sets the destination for usage and error messages.
|
|
// If output is nil, os.Stderr is used.
|
|
func (c *Commander) SetOutput(output io.Writer) {
|
|
c.output = output
|
|
}
|
|
|
|
func (c *Commander) initTemplates() {
|
|
c.UsageTemplate = `{{ $cmd := . }}{{.CommandPath | printf "%-11s"}} :: {{.Short}}
|
|
Usage: {{if .Runnable}}
|
|
{{.UseLine}}{{if .HasFlags}} [flags]{{end}}{{end}}{{if .HasSubCommands}}
|
|
{{ .CommandPath}} [command]{{end}}
|
|
{{ if .HasSubCommands}}
|
|
Available Commands: {{range .Commands}}{{if .Runnable}}
|
|
{{.Use | printf "%-11s"}} :: {{.Short}}{{end}}{{end}}
|
|
{{end}}
|
|
{{ if .HasFlags}} Available Flags:
|
|
{{.Flags.FlagUsages}}{{end}}
|
|
Additional help topics: {{if gt .Commands 0 }}{{range .Commands}}{{if not .Runnable}}
|
|
{{.CommandPath | printf "%-11s"}} :: {{.Short}}{{end}}{{end}}{{end}}{{if gt .Parent.Commands 1 }}{{range .Parent.Commands}}{{if .Runnable}}{{if not (eq .Name $cmd.Name) }}{{end}}
|
|
{{.CommandPath | printf "%-11s"}} :: {{.Short}}{{end}}{{end}}{{end}}
|
|
|
|
Use "{{.Commander.Name}} help [command]" for more information about that command.
|
|
`
|
|
|
|
c.HelpTemplate = `{{if .Runnable}}Usage: {{.ProgramName}} {{.UsageLine}}
|
|
|
|
{{end}}{{.Long | trim}}
|
|
`
|
|
}
|
|
|
|
// Command is just that, a command for your application.
|
|
// eg. 'go run' ... 'run' is the command. Cobra requires
|
|
// you to define the usage and description as part of your command
|
|
// definition to ensure usability.
|
|
type Command struct {
|
|
// Name is the command name, usually the executable's name.
|
|
name string
|
|
// The one-line usage message.
|
|
Use string
|
|
// The short description shown in the 'help' output.
|
|
Short string
|
|
// The long message shown in the 'help <this-command>' output.
|
|
Long string
|
|
// Set of flags specific to this command.
|
|
flags *flag.FlagSet
|
|
// Set of flags children commands will inherit
|
|
pflags *flag.FlagSet
|
|
// Run runs the command.
|
|
// The args are the arguments after the command name.
|
|
Run func(cmd *Command, args []string)
|
|
// Commands is the list of commands supported by this Commander program.
|
|
commands []*Command
|
|
// Parent Command for this command
|
|
parent *Command
|
|
// Commander
|
|
cmdr *Commander
|
|
flagErrorBuf *bytes.Buffer
|
|
}
|
|
|
|
// find the target command given the args and command tree
|
|
func (c *Command) Find(args []string) (cmd *Command, a []string, err error) {
|
|
if c == nil {
|
|
return nil, nil, fmt.Errorf("Called find() on a nil Command")
|
|
}
|
|
|
|
validSubCommand := false
|
|
if len(args) > 1 && c.HasSubCommands() {
|
|
for _, cmd := range c.commands {
|
|
if cmd.Name() == args[0] {
|
|
validSubCommand = true
|
|
return cmd.Find(args[1:])
|
|
}
|
|
}
|
|
}
|
|
if !validSubCommand && c.Runnable() {
|
|
return c, args, nil
|
|
}
|
|
|
|
return nil, nil, nil
|
|
}
|
|
|
|
func (c *Command) Commander() *Commander {
|
|
return c.cmdr
|
|
}
|
|
|
|
// execute the command determined by args and the command tree
|
|
func (c *Command) execute(args []string) (err error) {
|
|
err = fmt.Errorf("unknown subcommand %q\nRun 'help' for usage.\n", args[0])
|
|
|
|
if c == nil {
|
|
return fmt.Errorf("Called Execute() on a nil Command")
|
|
}
|
|
|
|
cmd, a, e := c.Find(args)
|
|
if e == nil {
|
|
err = cmd.ParseFlags(a)
|
|
if err != nil {
|
|
cmd.Usage()
|
|
return err
|
|
} else {
|
|
argWoFlags := cmd.Flags().Args()
|
|
cmd.Run(cmd, argWoFlags)
|
|
return nil
|
|
}
|
|
}
|
|
err = e
|
|
return err
|
|
}
|
|
|
|
// Used for testing
|
|
func (c *Command) ResetCommands() {
|
|
c.commands = nil
|
|
}
|
|
|
|
func (c *Command) Commands() []*Command {
|
|
return c.commands
|
|
}
|
|
|
|
// Add one or many commands as children of this
|
|
func (c *Command) AddCommand(cmds ...*Command) {
|
|
for i, x := range cmds {
|
|
if cmds[i] == c {
|
|
panic("Command can't be a child of itself")
|
|
}
|
|
cmds[i].parent = c
|
|
cmds[i].cmdr = cmds[i].parent.cmdr
|
|
c.commands = append(c.commands, x)
|
|
}
|
|
}
|
|
|
|
func (c *Command) Print(i ...interface{}) {
|
|
c.cmdr.POut(i...)
|
|
}
|
|
|
|
func (c *Command) Println(i ...interface{}) {
|
|
str := fmt.Sprintln(i...)
|
|
c.Print(str)
|
|
}
|
|
|
|
func (c *Command) Printf(format string, i ...interface{}) {
|
|
str := fmt.Sprintf(format, i...)
|
|
c.Print(str)
|
|
}
|
|
|
|
func (c *Command) Usage() error {
|
|
err := c.cmdr.UsageFunc(c)
|
|
if err != nil {
|
|
fmt.Println(err)
|
|
}
|
|
|
|
return err
|
|
}
|
|
|
|
func (c *Command) CommandPath() string {
|
|
str := c.Name()
|
|
x := c
|
|
for x.HasParent() {
|
|
str = x.parent.Name() + " " + str
|
|
x = x.parent
|
|
}
|
|
|
|
return str
|
|
}
|
|
|
|
//The full usage for a given command (including parents)
|
|
func (c *Command) UseLine() string {
|
|
str := ""
|
|
if c.HasParent() {
|
|
str = c.parent.CommandPath() + " "
|
|
}
|
|
return str + c.Use
|
|
}
|
|
|
|
// For use in determining which flags have been assigned to which commands
|
|
// and which persist
|
|
func (c *Command) DebugFlags() {
|
|
c.Println("DebugFlags called on", c.Name())
|
|
var debugflags func(*Command)
|
|
|
|
debugflags = func(x *Command) {
|
|
if x.HasFlags() || x.HasPersistentFlags() {
|
|
c.Println(x.Name())
|
|
}
|
|
if x.HasFlags() {
|
|
x.flags.VisitAll(func(f *flag.Flag) {
|
|
if x.HasPersistentFlags() {
|
|
if x.persistentFlag(f.Name) == nil {
|
|
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [L]")
|
|
} else {
|
|
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [LP]")
|
|
}
|
|
} else {
|
|
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [L]")
|
|
}
|
|
})
|
|
}
|
|
if x.HasPersistentFlags() {
|
|
x.pflags.VisitAll(func(f *flag.Flag) {
|
|
if x.HasFlags() {
|
|
if x.flags.Lookup(f.Name) == nil {
|
|
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [P]")
|
|
}
|
|
} else {
|
|
c.Println(" -"+f.Shorthand+",", "--"+f.Name, "["+f.DefValue+"]", "", f.Value, " [P]")
|
|
}
|
|
})
|
|
}
|
|
c.Println(x.flagErrorBuf)
|
|
if x.HasSubCommands() {
|
|
for _, y := range x.commands {
|
|
debugflags(y)
|
|
}
|
|
}
|
|
}
|
|
|
|
debugflags(c)
|
|
}
|
|
|
|
// Usage prints the usage details to the standard output.
|
|
//func (c *Command) PrintUsage() {
|
|
//if c.Runnable() {
|
|
//c.Printf("usage: %s\n\n", c.Usage())
|
|
//}
|
|
|
|
//c.Println(strings.Trim(c.Long, "\n"))
|
|
//}
|
|
|
|
// Name returns the command's name: the first word in the use line.
|
|
func (c *Command) Name() string {
|
|
if c.name != "" {
|
|
return c.name
|
|
}
|
|
name := c.Use
|
|
i := strings.Index(name, " ")
|
|
if i >= 0 {
|
|
name = name[:i]
|
|
}
|
|
return name
|
|
}
|
|
|
|
// Determine if the command is itself runnable
|
|
func (c *Command) Runnable() bool {
|
|
return c.Run != nil
|
|
}
|
|
|
|
// Determine if the command has children commands
|
|
func (c *Command) HasSubCommands() bool {
|
|
return len(c.commands) > 0
|
|
}
|
|
|
|
// Determine if the command is a child command
|
|
func (c *Command) HasParent() bool {
|
|
return c.parent != nil
|
|
}
|
|
|
|
// Get the Commands FlagSet
|
|
func (c *Command) Flags() *flag.FlagSet {
|
|
if c.flags == nil {
|
|
c.flags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
|
if c.flagErrorBuf == nil {
|
|
c.flagErrorBuf = new(bytes.Buffer)
|
|
}
|
|
c.flags.SetOutput(c.flagErrorBuf)
|
|
}
|
|
return c.flags
|
|
}
|
|
|
|
// Get the Commands Persistent FlagSet
|
|
func (c *Command) PersistentFlags() *flag.FlagSet {
|
|
if c.pflags == nil {
|
|
c.pflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
|
if c.flagErrorBuf == nil {
|
|
c.flagErrorBuf = new(bytes.Buffer)
|
|
}
|
|
c.pflags.SetOutput(c.flagErrorBuf)
|
|
}
|
|
return c.pflags
|
|
}
|
|
|
|
// Intended for use in testing
|
|
func (c *Command) ResetFlags() {
|
|
c.flagErrorBuf = new(bytes.Buffer)
|
|
c.flagErrorBuf.Reset()
|
|
c.flags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
|
c.flags.SetOutput(c.flagErrorBuf)
|
|
c.pflags = flag.NewFlagSet(c.Name(), flag.ContinueOnError)
|
|
c.pflags.SetOutput(c.flagErrorBuf)
|
|
}
|
|
|
|
// Does the command contain flags (local not persistent)
|
|
func (c *Command) HasFlags() bool {
|
|
return c.Flags().HasFlags()
|
|
}
|
|
|
|
// Does the command contain persistent flags
|
|
func (c *Command) HasPersistentFlags() bool {
|
|
return c.PersistentFlags().HasFlags()
|
|
}
|
|
|
|
// Climbs up the command tree looking for matching flag
|
|
func (c *Command) Flag(name string) (flag *flag.Flag) {
|
|
flag = c.Flags().Lookup(name)
|
|
|
|
if flag == nil {
|
|
flag = c.persistentFlag(name)
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
// recursively find matching persistent flag
|
|
func (c *Command) persistentFlag(name string) (flag *flag.Flag) {
|
|
if c.HasPersistentFlags() {
|
|
flag = c.PersistentFlags().Lookup(name)
|
|
}
|
|
|
|
if flag == nil && c.HasParent() {
|
|
flag = c.parent.persistentFlag(name)
|
|
}
|
|
return
|
|
}
|
|
|
|
// Parses persistent flag tree & local flags
|
|
func (c *Command) ParseFlags(args []string) (err error) {
|
|
c.mergePersistentFlags()
|
|
|
|
err = c.Flags().Parse(args)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (c *Command) mergePersistentFlags() {
|
|
var rmerge func(x *Command)
|
|
|
|
rmerge = func(x *Command) {
|
|
if x.HasPersistentFlags() {
|
|
x.PersistentFlags().VisitAll(func(f *flag.Flag) {
|
|
if c.Flags().Lookup(f.Name) == nil {
|
|
c.Flags().AddFlag(f)
|
|
}
|
|
})
|
|
}
|
|
if x.HasParent() {
|
|
rmerge(x.parent)
|
|
}
|
|
}
|
|
|
|
rmerge(c)
|
|
}
|
|
|
|
func (c *Command) Parent() *Command {
|
|
return c.parent
|
|
}
|
|
|
|
func Gt(a interface{}, b interface{}) bool {
|
|
var left, right int64
|
|
av := reflect.ValueOf(a)
|
|
|
|
switch av.Kind() {
|
|
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
|
|
left = int64(av.Len())
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
left = av.Int()
|
|
case reflect.String:
|
|
left, _ = strconv.ParseInt(av.String(), 10, 64)
|
|
}
|
|
|
|
bv := reflect.ValueOf(b)
|
|
|
|
switch bv.Kind() {
|
|
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
|
|
right = int64(bv.Len())
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
right = bv.Int()
|
|
case reflect.String:
|
|
right, _ = strconv.ParseInt(bv.String(), 10, 64)
|
|
}
|
|
|
|
return left > right
|
|
}
|
|
|
|
func Eq(a interface{}, b interface{}) bool {
|
|
av := reflect.ValueOf(a)
|
|
bv := reflect.ValueOf(b)
|
|
|
|
switch av.Kind() {
|
|
case reflect.Array, reflect.Chan, reflect.Map, reflect.Slice:
|
|
panic("Eq called on unsupported type")
|
|
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
|
|
return av.Int() == bv.Int()
|
|
case reflect.String:
|
|
return av.String() == bv.String()
|
|
}
|
|
return false
|
|
}
|
|
|
|
// tmpl executes the given template text on data, writing the result to w.
|
|
func tmpl(w io.Writer, text string, data interface{}) error {
|
|
t := template.New("top")
|
|
t.Funcs(template.FuncMap{
|
|
"trim": strings.TrimSpace,
|
|
"gt": Gt,
|
|
"eq": Eq,
|
|
})
|
|
template.Must(t.Parse(text))
|
|
return t.Execute(w, data)
|
|
}
|