69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
package complete
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type Commands map[string]Command
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type Flags map[string]Predicate
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type Command struct {
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Name string
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Sub Commands
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Flags Flags
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Args Predicate
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}
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// options returns all available complete options for the given command
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// args are all except the last command line arguments relevant to the command
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func (c *Command) options(args []string) (options []Option, only bool) {
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// remove the first argument, which is the command name
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args = args[1:]
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// if prev 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[last(args)]; ok && !predicate.ExpectsNothing {
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return predicate.predict(), true
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}
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sub, options, only := c.searchSub(args)
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if only {
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return
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}
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// if no subcommand was entered in any of the args, add the
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// subcommands as complete options.
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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 options
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for flag := range c.Flags {
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options = append(options, Arg(flag))
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}
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// add additional expected argument of the command
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if !c.Args.ExpectsNothing {
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options = append(options, c.Args.predict()...)
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}
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return
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}
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func (c *Command) searchSub(args []string) (sub string, all []Option, only bool) {
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for i, arg := range args {
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if cmd, ok := c.Sub[arg]; ok {
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sub = arg
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all, only = cmd.options(args[i:])
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return
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}
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}
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return "", nil, false
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}
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func (c *Command) subCommands() []Option {
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subs := make([]Option, 0, len(c.Sub))
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for sub := range c.Sub {
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subs = append(subs, Arg(sub))
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}
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return subs
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}
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