61 lines
1.5 KiB
Go
61 lines
1.5 KiB
Go
package command
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import (
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"fmt"
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"os"
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"os/signal"
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"syscall"
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"github.com/mitchellh/cli"
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)
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// Factory is a function that returns a new instance of a CLI-sub command.
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type Factory func(cli.Ui) (cli.Command, error)
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// Register adds a new CLI sub-command to the registry.
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func Register(name string, fn Factory) {
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if registry == nil {
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registry = make(map[string]Factory)
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}
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if registry[name] != nil {
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panic(fmt.Errorf("Command %q is already registered", name))
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}
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registry[name] = fn
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}
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// Map returns a realized mapping of available CLI commands in a format that
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// the CLI class can consume. This should be called after all registration is
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// complete.
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func Map(ui cli.Ui) map[string]cli.CommandFactory {
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m := make(map[string]cli.CommandFactory)
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for name, fn := range registry {
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thisFn := fn
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m[name] = func() (cli.Command, error) {
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return thisFn(ui)
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}
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}
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return m
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}
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// registry has an entry for each available CLI sub-command, indexed by sub
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// command name. This should be populated at package init() time via Register().
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var registry map[string]Factory
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// MakeShutdownCh returns a channel that can be used for shutdown notifications
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// for commands. This channel will send a message for every interrupt or SIGTERM
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// received.
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func MakeShutdownCh() <-chan struct{} {
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resultCh := make(chan struct{})
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signalCh := make(chan os.Signal, 4)
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signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM)
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go func() {
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for {
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<-signalCh
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resultCh <- struct{}{}
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}
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}()
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return resultCh
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}
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