84 lines
2.4 KiB
Go
84 lines
2.4 KiB
Go
package complete
|
|
|
|
// Command represents a command line
|
|
// It holds the data that enables auto completion of a given typed command line
|
|
// Command can also be a sub command.
|
|
type Command struct {
|
|
// Sub is map of sub commands of the current command
|
|
// The key refer to the sub command name, and the value is it's
|
|
// Command descriptive struct.
|
|
Sub Commands
|
|
|
|
// Flags is a map of flags that the command accepts.
|
|
// The key is the flag name, and the value is it's prediction options.
|
|
Flags Flags
|
|
|
|
// Args are extra arguments that the command accepts, those who are
|
|
// given without any flag before.
|
|
Args Predicate
|
|
}
|
|
|
|
// Commands is the type of Sub member, it maps a command name to a command struct
|
|
type Commands map[string]Command
|
|
|
|
// Flags is the type Flags of the Flags member, it maps a flag name to the flag
|
|
// prediction options.
|
|
type Flags map[string]Predicate
|
|
|
|
// options returns all available complete options for the given command
|
|
// args are all except the last command line arguments relevant to the command
|
|
func (c *Command) options(args []string) (options []Matcher, only bool) {
|
|
|
|
// remove the first argument, which is the command name
|
|
args = args[1:]
|
|
last := last(args)
|
|
// if prev has something that needs to follow it,
|
|
// it is the most relevant completion
|
|
if predicate, ok := c.Flags[last]; ok && predicate != nil {
|
|
return predicate.predict(last), true
|
|
}
|
|
|
|
sub, options, only := c.searchSub(args)
|
|
if only {
|
|
return
|
|
}
|
|
|
|
// if no subcommand was entered in any of the args, add the
|
|
// subcommands as complete options.
|
|
if sub == "" {
|
|
options = append(options, c.subCommands()...)
|
|
}
|
|
|
|
// add global available complete options
|
|
for flag := range c.Flags {
|
|
options = append(options, MatchPrefix(flag))
|
|
}
|
|
|
|
// add additional expected argument of the command
|
|
options = append(options, c.Args.predict(last)...)
|
|
|
|
return
|
|
}
|
|
|
|
// searchSub searches recursively within sub commands if the sub command appear
|
|
// in the on of the arguments.
|
|
func (c *Command) searchSub(args []string) (sub string, all []Matcher, only bool) {
|
|
for i, arg := range args {
|
|
if cmd, ok := c.Sub[arg]; ok {
|
|
sub = arg
|
|
all, only = cmd.options(args[i:])
|
|
return
|
|
}
|
|
}
|
|
return "", nil, false
|
|
}
|
|
|
|
// suvCommands returns a list of matchers according to the sub command names
|
|
func (c *Command) subCommands() []Matcher {
|
|
subs := make([]Matcher, 0, len(c.Sub))
|
|
for sub := range c.Sub {
|
|
subs = append(subs, MatchPrefix(sub))
|
|
}
|
|
return subs
|
|
}
|