58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
package command
|
|
|
|
import (
|
|
"bufio"
|
|
"flag"
|
|
"io"
|
|
|
|
"github.com/mitchellh/cli"
|
|
)
|
|
|
|
// FlagSetFlags is an enum to define what flags are present in the
|
|
// default FlagSet returned by Meta.FlagSet.
|
|
type FlagSetFlags uint
|
|
|
|
const (
|
|
FlagSetNone FlagSetFlags = 0
|
|
FlagSetServer FlagSetFlags = 1 << iota
|
|
FlagSetDefault = FlagSetServer
|
|
)
|
|
|
|
// Meta contains the meta-options and functionality that nearly every
|
|
// Nomad command inherits.
|
|
type Meta struct {
|
|
Ui cli.Ui
|
|
|
|
// These are set by the command line flags.
|
|
flagAddress string
|
|
}
|
|
|
|
// FlagSet returns a FlagSet with the common flags that every
|
|
// command implements. The exact behavior of FlagSet can be configured
|
|
// using the flags as the second parameter, for example to disable
|
|
// server settings on the commands that don't talk to a server.
|
|
func (m *Meta) FlagSet(n string, fs FlagSetFlags) *flag.FlagSet {
|
|
f := flag.NewFlagSet(n, flag.ContinueOnError)
|
|
|
|
// FlagSetServer tells us to enable the settings for selecting
|
|
// the server information.
|
|
if fs&FlagSetServer != 0 {
|
|
f.StringVar(&m.flagAddress, "address", "", "")
|
|
}
|
|
|
|
// Create an io.Writer that writes to our Ui properly for errors.
|
|
// This is kind of a hack, but it does the job. Basically: create
|
|
// a pipe, use a scanner to break it into lines, and output each line
|
|
// to the UI. Do this forever.
|
|
errR, errW := io.Pipe()
|
|
errScanner := bufio.NewScanner(errR)
|
|
go func() {
|
|
for errScanner.Scan() {
|
|
m.Ui.Error(errScanner.Text())
|
|
}
|
|
}()
|
|
f.SetOutput(errW)
|
|
|
|
return f
|
|
}
|