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cmd.go
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package kingpin
import (
"fmt"
"strings"
)
type cmdGroup struct {
app *Application
parent *CmdClause
commands map[string]*CmdClause
commandOrder []*CmdClause
}
func newCmdGroup(app *Application) *cmdGroup {
return &cmdGroup{
app: app,
commands: make(map[string]*CmdClause),
}
}
func (c *cmdGroup) flattenedCommands() (out []*CmdClause) {
for _, cmd := range c.commandOrder {
if len(cmd.commands) == 0 {
out = append(out, cmd)
}
out = append(out, cmd.flattenedCommands()...)
}
return
}
func (c *cmdGroup) addCommand(name, help string) *CmdClause {
cmd := newCommand(c.app, name, help)
c.commands[name] = cmd
c.commandOrder = append(c.commandOrder, cmd)
return cmd
}
func (c *cmdGroup) init() error {
seen := map[string]bool{}
for _, cmd := range c.commandOrder {
if seen[cmd.name] {
return fmt.Errorf("duplicate command '%s'", cmd.name)
}
seen[cmd.name] = true
if err := cmd.init(); err != nil {
return err
}
}
return nil
}
func (c *cmdGroup) have() bool {
return len(c.commands) > 0
}
type CmdClauseValidator func(*CmdClause) error
// A CmdClause is a single top-level command. It encapsulates a set of flags
// and either subcommands or positional arguments.
type CmdClause struct {
*flagGroup
*argGroup
*cmdGroup
app *Application
name string
help string
action Action
preAction Action
validator CmdClauseValidator
hidden bool
}
func newCommand(app *Application, name, help string) *CmdClause {
c := &CmdClause{
flagGroup: newFlagGroup(),
argGroup: newArgGroup(),
cmdGroup: newCmdGroup(app),
app: app,
name: name,
help: help,
}
return c
}
// Validate sets a validation function to run when parsing.
func (c *CmdClause) Validate(validator CmdClauseValidator) *CmdClause {
c.validator = validator
return c
}
func (c *CmdClause) FullCommand() string {
out := []string{c.name}
for p := c.parent; p != nil; p = p.parent {
out = append([]string{p.name}, out...)
}
return strings.Join(out, " ")
}
// Command adds a new sub-command.
func (c *CmdClause) Command(name, help string) *CmdClause {
cmd := c.addCommand(name, help)
cmd.parent = c
return cmd
}
func (c *CmdClause) Action(action Action) *CmdClause {
c.action = action
return c
}
func (c *CmdClause) PreAction(action Action) *CmdClause {
c.preAction = action
return c
}
func (c *CmdClause) init() error {
if err := c.flagGroup.init(); err != nil {
return err
}
if c.argGroup.have() && c.cmdGroup.have() {
return fmt.Errorf("can't mix Arg()s with Command()s")
}
if err := c.argGroup.init(); err != nil {
return err
}
if err := c.cmdGroup.init(); err != nil {
return err
}
return nil
}
func (c *CmdClause) Hidden() *CmdClause {
c.hidden = true
return c
}