112 lines
3.4 KiB
Go
112 lines
3.4 KiB
Go
package complete
|
|
|
|
// Command represents a command line
|
|
// It holds the data that enables auto completion of 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 predictions.
|
|
Flags Flags
|
|
|
|
// GlobalFlags is a map of flags that the command accepts.
|
|
// Global flags that can appear also after a sub command.
|
|
GlobalFlags Flags
|
|
|
|
// Args are extra arguments that the command accepts, those who are
|
|
// given without any flag before.
|
|
Args Predictor
|
|
}
|
|
|
|
// Predict returns all possible predictions for args according to the command struct
|
|
func (c *Command) Predict(a Args) []string {
|
|
options, _ := c.predict(a)
|
|
return options
|
|
}
|
|
|
|
// Commands is the type of Sub member, it maps a command name to a command struct
|
|
type Commands map[string]Command
|
|
|
|
// Predict completion of sub command names names according to command line arguments
|
|
func (c Commands) Predict(a Args) (prediction []string) {
|
|
for sub := range c {
|
|
prediction = append(prediction, sub)
|
|
}
|
|
return
|
|
}
|
|
|
|
// Flags is the type Flags of the Flags member, it maps a flag name to the flag predictions.
|
|
type Flags map[string]Predictor
|
|
|
|
// Predict completion of flags names according to command line arguments
|
|
func (f Flags) Predict(a Args) (prediction []string) {
|
|
for flag := range f {
|
|
// If the flag starts with a hyphen, we avoid emitting the prediction
|
|
// unless the last typed arg contains a hyphen as well.
|
|
flagHyphenStart := len(flag) != 0 && flag[0] == '-'
|
|
lastHyphenStart := len(a.Last) != 0 && a.Last[0] == '-'
|
|
if flagHyphenStart && !lastHyphenStart {
|
|
continue
|
|
}
|
|
prediction = append(prediction, flag)
|
|
}
|
|
return
|
|
}
|
|
|
|
// predict options
|
|
// only is set to true if no more options are allowed to be returned
|
|
// those are in cases of special flag that has specific completion arguments,
|
|
// and other flags or sub commands can't come after it.
|
|
func (c *Command) predict(a Args) (options []string, only bool) {
|
|
|
|
// search sub commands for predictions first
|
|
subCommandFound := false
|
|
for i, arg := range a.Completed {
|
|
if cmd, ok := c.Sub[arg]; ok {
|
|
subCommandFound = true
|
|
|
|
// recursive call for sub command
|
|
options, only = cmd.predict(a.from(i))
|
|
if only {
|
|
return
|
|
}
|
|
|
|
// We matched so stop searching. Continuing to search can accidentally
|
|
// match a subcommand with current set of commands, see issue #46.
|
|
break
|
|
}
|
|
}
|
|
|
|
// if last completed word is a global flag that we need to complete
|
|
if predictor, ok := c.GlobalFlags[a.LastCompleted]; ok && predictor != nil {
|
|
Log("Predicting according to global flag %s", a.LastCompleted)
|
|
return predictor.Predict(a), true
|
|
}
|
|
|
|
options = append(options, c.GlobalFlags.Predict(a)...)
|
|
|
|
// if a sub command was entered, we won't add the parent command
|
|
// completions and we return here.
|
|
if subCommandFound {
|
|
return
|
|
}
|
|
|
|
// if last completed word is a command flag that we need to complete
|
|
if predictor, ok := c.Flags[a.LastCompleted]; ok && predictor != nil {
|
|
Log("Predicting according to flag %s", a.LastCompleted)
|
|
return predictor.Predict(a), true
|
|
}
|
|
|
|
options = append(options, c.Sub.Predict(a)...)
|
|
options = append(options, c.Flags.Predict(a)...)
|
|
if c.Args != nil {
|
|
options = append(options, c.Args.Predict(a)...)
|
|
}
|
|
|
|
return
|
|
}
|