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* Use vendored go-swagger * vendor go-swagger * revert un wanteed change * remove un-needed GO111MODULE * Update Makefile Co-Authored-By: techknowlogick <matti@mdranta.net>
466 lines
10 KiB
Go
466 lines
10 KiB
Go
package flags
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import (
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"reflect"
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"sort"
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"strconv"
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"strings"
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)
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// Command represents an application command. Commands can be added to the
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// parser (which itself is a command) and are selected/executed when its name
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// is specified on the command line. The Command type embeds a Group and
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// therefore also carries a set of command specific options.
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type Command struct {
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// Embedded, see Group for more information
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*Group
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// The name by which the command can be invoked
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Name string
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// The active sub command (set by parsing) or nil
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Active *Command
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// Whether subcommands are optional
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SubcommandsOptional bool
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// Aliases for the command
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Aliases []string
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// Whether positional arguments are required
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ArgsRequired bool
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commands []*Command
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hasBuiltinHelpGroup bool
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args []*Arg
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}
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// Commander is an interface which can be implemented by any command added in
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// the options. When implemented, the Execute method will be called for the last
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// specified (sub)command providing the remaining command line arguments.
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type Commander interface {
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// Execute will be called for the last active (sub)command. The
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// args argument contains the remaining command line arguments. The
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// error that Execute returns will be eventually passed out of the
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// Parse method of the Parser.
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Execute(args []string) error
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}
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// Usage is an interface which can be implemented to show a custom usage string
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// in the help message shown for a command.
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type Usage interface {
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// Usage is called for commands to allow customized printing of command
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// usage in the generated help message.
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Usage() string
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}
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type lookup struct {
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shortNames map[string]*Option
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longNames map[string]*Option
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commands map[string]*Command
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}
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// AddCommand adds a new command to the parser with the given name and data. The
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// data needs to be a pointer to a struct from which the fields indicate which
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// options are in the command. The provided data can implement the Command and
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// Usage interfaces.
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func (c *Command) AddCommand(command string, shortDescription string, longDescription string, data interface{}) (*Command, error) {
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cmd := newCommand(command, shortDescription, longDescription, data)
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cmd.parent = c
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if err := cmd.scan(); err != nil {
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return nil, err
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}
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c.commands = append(c.commands, cmd)
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return cmd, nil
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}
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// AddGroup adds a new group to the command with the given name and data. The
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// data needs to be a pointer to a struct from which the fields indicate which
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// options are in the group.
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func (c *Command) AddGroup(shortDescription string, longDescription string, data interface{}) (*Group, error) {
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group := newGroup(shortDescription, longDescription, data)
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group.parent = c
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if err := group.scanType(c.scanSubcommandHandler(group)); err != nil {
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return nil, err
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}
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c.groups = append(c.groups, group)
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return group, nil
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}
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// Commands returns a list of subcommands of this command.
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func (c *Command) Commands() []*Command {
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return c.commands
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}
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// Find locates the subcommand with the given name and returns it. If no such
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// command can be found Find will return nil.
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func (c *Command) Find(name string) *Command {
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for _, cc := range c.commands {
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if cc.match(name) {
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return cc
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}
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}
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return nil
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}
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// FindOptionByLongName finds an option that is part of the command, or any of
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// its parent commands, by matching its long name (including the option
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// namespace).
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func (c *Command) FindOptionByLongName(longName string) (option *Option) {
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for option == nil && c != nil {
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option = c.Group.FindOptionByLongName(longName)
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c, _ = c.parent.(*Command)
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}
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return option
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}
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// FindOptionByShortName finds an option that is part of the command, or any of
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// its parent commands, by matching its long name (including the option
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// namespace).
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func (c *Command) FindOptionByShortName(shortName rune) (option *Option) {
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for option == nil && c != nil {
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option = c.Group.FindOptionByShortName(shortName)
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c, _ = c.parent.(*Command)
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}
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return option
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}
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// Args returns a list of positional arguments associated with this command.
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func (c *Command) Args() []*Arg {
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ret := make([]*Arg, len(c.args))
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copy(ret, c.args)
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return ret
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}
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func newCommand(name string, shortDescription string, longDescription string, data interface{}) *Command {
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return &Command{
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Group: newGroup(shortDescription, longDescription, data),
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Name: name,
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}
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}
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func (c *Command) scanSubcommandHandler(parentg *Group) scanHandler {
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f := func(realval reflect.Value, sfield *reflect.StructField) (bool, error) {
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mtag := newMultiTag(string(sfield.Tag))
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if err := mtag.Parse(); err != nil {
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return true, err
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}
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positional := mtag.Get("positional-args")
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if len(positional) != 0 {
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stype := realval.Type()
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for i := 0; i < stype.NumField(); i++ {
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field := stype.Field(i)
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m := newMultiTag((string(field.Tag)))
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if err := m.Parse(); err != nil {
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return true, err
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}
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name := m.Get("positional-arg-name")
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if len(name) == 0 {
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name = field.Name
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}
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required := -1
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requiredMaximum := -1
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sreq := m.Get("required")
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if sreq != "" {
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required = 1
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rng := strings.SplitN(sreq, "-", 2)
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if len(rng) > 1 {
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if preq, err := strconv.ParseInt(rng[0], 10, 32); err == nil {
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required = int(preq)
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}
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if preq, err := strconv.ParseInt(rng[1], 10, 32); err == nil {
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requiredMaximum = int(preq)
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}
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} else {
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if preq, err := strconv.ParseInt(sreq, 10, 32); err == nil {
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required = int(preq)
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}
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}
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}
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arg := &Arg{
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Name: name,
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Description: m.Get("description"),
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Required: required,
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RequiredMaximum: requiredMaximum,
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value: realval.Field(i),
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tag: m,
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}
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c.args = append(c.args, arg)
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if len(mtag.Get("required")) != 0 {
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c.ArgsRequired = true
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}
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}
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return true, nil
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}
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subcommand := mtag.Get("command")
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if len(subcommand) != 0 {
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var ptrval reflect.Value
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if realval.Kind() == reflect.Ptr {
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ptrval = realval
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if ptrval.IsNil() {
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ptrval.Set(reflect.New(ptrval.Type().Elem()))
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}
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} else {
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ptrval = realval.Addr()
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}
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shortDescription := mtag.Get("description")
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longDescription := mtag.Get("long-description")
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subcommandsOptional := mtag.Get("subcommands-optional")
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aliases := mtag.GetMany("alias")
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subc, err := c.AddCommand(subcommand, shortDescription, longDescription, ptrval.Interface())
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if err != nil {
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return true, err
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}
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subc.Hidden = mtag.Get("hidden") != ""
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if len(subcommandsOptional) > 0 {
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subc.SubcommandsOptional = true
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}
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if len(aliases) > 0 {
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subc.Aliases = aliases
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}
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return true, nil
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}
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return parentg.scanSubGroupHandler(realval, sfield)
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}
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return f
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}
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func (c *Command) scan() error {
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return c.scanType(c.scanSubcommandHandler(c.Group))
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}
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func (c *Command) eachOption(f func(*Command, *Group, *Option)) {
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c.eachCommand(func(c *Command) {
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c.eachGroup(func(g *Group) {
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for _, option := range g.options {
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f(c, g, option)
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}
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})
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}, true)
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}
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func (c *Command) eachCommand(f func(*Command), recurse bool) {
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f(c)
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for _, cc := range c.commands {
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if recurse {
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cc.eachCommand(f, true)
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} else {
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f(cc)
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}
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}
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}
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func (c *Command) eachActiveGroup(f func(cc *Command, g *Group)) {
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c.eachGroup(func(g *Group) {
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f(c, g)
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})
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if c.Active != nil {
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c.Active.eachActiveGroup(f)
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}
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}
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func (c *Command) addHelpGroups(showHelp func() error) {
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if !c.hasBuiltinHelpGroup {
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c.addHelpGroup(showHelp)
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c.hasBuiltinHelpGroup = true
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}
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for _, cc := range c.commands {
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cc.addHelpGroups(showHelp)
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}
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}
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func (c *Command) makeLookup() lookup {
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ret := lookup{
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shortNames: make(map[string]*Option),
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longNames: make(map[string]*Option),
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commands: make(map[string]*Command),
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}
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parent := c.parent
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var parents []*Command
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for parent != nil {
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if cmd, ok := parent.(*Command); ok {
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parents = append(parents, cmd)
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parent = cmd.parent
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} else {
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parent = nil
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}
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}
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for i := len(parents) - 1; i >= 0; i-- {
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parents[i].fillLookup(&ret, true)
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}
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c.fillLookup(&ret, false)
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return ret
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}
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func (c *Command) fillLookup(ret *lookup, onlyOptions bool) {
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c.eachGroup(func(g *Group) {
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for _, option := range g.options {
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if option.ShortName != 0 {
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ret.shortNames[string(option.ShortName)] = option
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}
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if len(option.LongName) > 0 {
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ret.longNames[option.LongNameWithNamespace()] = option
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}
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}
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})
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if onlyOptions {
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return
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}
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for _, subcommand := range c.commands {
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ret.commands[subcommand.Name] = subcommand
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for _, a := range subcommand.Aliases {
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ret.commands[a] = subcommand
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}
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}
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}
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func (c *Command) groupByName(name string) *Group {
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if grp := c.Group.groupByName(name); grp != nil {
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return grp
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}
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for _, subc := range c.commands {
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prefix := subc.Name + "."
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if strings.HasPrefix(name, prefix) {
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if grp := subc.groupByName(name[len(prefix):]); grp != nil {
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return grp
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}
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} else if name == subc.Name {
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return subc.Group
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}
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}
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return nil
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}
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type commandList []*Command
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func (c commandList) Less(i, j int) bool {
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return c[i].Name < c[j].Name
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}
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func (c commandList) Len() int {
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return len(c)
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}
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func (c commandList) Swap(i, j int) {
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c[i], c[j] = c[j], c[i]
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}
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func (c *Command) sortedVisibleCommands() []*Command {
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ret := commandList(c.visibleCommands())
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sort.Sort(ret)
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return []*Command(ret)
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}
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func (c *Command) visibleCommands() []*Command {
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ret := make([]*Command, 0, len(c.commands))
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for _, cmd := range c.commands {
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if !cmd.Hidden {
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ret = append(ret, cmd)
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}
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}
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return ret
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}
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func (c *Command) match(name string) bool {
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if c.Name == name {
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return true
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}
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for _, v := range c.Aliases {
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if v == name {
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return true
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}
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}
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return false
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}
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func (c *Command) hasCliOptions() bool {
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ret := false
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c.eachGroup(func(g *Group) {
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if g.isBuiltinHelp {
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return
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}
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for _, opt := range g.options {
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if opt.canCli() {
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ret = true
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}
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}
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})
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return ret
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}
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func (c *Command) fillParseState(s *parseState) {
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s.positional = make([]*Arg, len(c.args))
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copy(s.positional, c.args)
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s.lookup = c.makeLookup()
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s.command = c
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}
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