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package cli
import (
"flag"
"io"
"log"
"os"
"github.com/google/subcommands"
)
// Command is a base for all subcommands.
type Command struct {
Log *log.Logger
}
// NewBaseCommand builds a new base command for the named tool.
func NewBaseCommand(name string) Command {
return Command{
Log: log.New(os.Stderr, name+": ", 0),
}
}
// SetFlags is a stub implementation of the SetFlags methods that does nothing.
func (Command) SetFlags(f *flag.FlagSet) {}
// UsageError logs a usage error and returns a suitable exit code.
func (c Command) UsageError(format string, args ...interface{}) subcommands.ExitStatus {
c.Log.Printf(format, args...)
return subcommands.ExitUsageError
}
// Fail logs an error message and returns a failing exit code.
func (c Command) Fail(format string, args ...interface{}) subcommands.ExitStatus {
c.Log.Printf(format, args...)
return subcommands.ExitFailure
}
// Error logs err and returns a failing exit code.
func (c Command) Error(err error) subcommands.ExitStatus {
return c.Fail(err.Error())
}
// CheckClose closes cl. On error it logs and writes to the status pointer.
// Intended for deferred Close() calls.
func (c Command) CheckClose(statusp *subcommands.ExitStatus, cl io.Closer) {
if err := cl.Close(); err != nil {
*statusp = c.Error(err)
}
}
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