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