68 lines
2.4 KiB
Go
68 lines
2.4 KiB
Go
package cli
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import (
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"github.com/posener/complete"
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)
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const (
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// RunResultHelp is a value that can be returned from Run to signal
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// to the CLI to render the help output.
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RunResultHelp = -18511
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)
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// A command is a runnable sub-command of a CLI.
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type Command interface {
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// Help should return long-form help text that includes the command-line
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// usage, a brief few sentences explaining the function of the command,
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// and the complete list of flags the command accepts.
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Help() string
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// Run should run the actual command with the given CLI instance and
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// command-line arguments. It should return the exit status when it is
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// finished.
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//
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// There are a handful of special exit codes this can return documented
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// above that change behavior.
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Run(args []string) int
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// Synopsis should return a one-line, short synopsis of the command.
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// This should be less than 50 characters ideally.
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Synopsis() string
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}
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// CommandAutocomplete is an extension of Command that enables fine-grained
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// autocompletion. Subcommand autocompletion will work even if this interface
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// is not implemented. By implementing this interface, more advanced
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// autocompletion is enabled.
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type CommandAutocomplete interface {
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// AutocompleteArgs returns the argument predictor for this command.
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// If argument completion is not supported, this should return
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// complete.PredictNothing.
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AutocompleteArgs() complete.Predictor
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// AutocompleteFlags returns a mapping of supported flags and autocomplete
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// options for this command. The map key for the Flags map should be the
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// complete flag such as "-foo" or "--foo".
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AutocompleteFlags() complete.Flags
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}
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// CommandHelpTemplate is an extension of Command that also has a function
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// for returning a template for the help rather than the help itself. In
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// this scenario, both Help and HelpTemplate should be implemented.
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//
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// If CommandHelpTemplate isn't implemented, the Help is output as-is.
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type CommandHelpTemplate interface {
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// HelpTemplate is the template in text/template format to use for
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// displaying the Help. The keys available are:
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//
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// * ".Help" - The help text itself
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// * ".Subcommands"
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//
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HelpTemplate() string
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}
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// CommandFactory is a type of function that is a factory for commands.
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// We need a factory because we may need to setup some state on the
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// struct that implements the command itself.
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type CommandFactory func() (Command, error)
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