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package kingpin
import (
"os"
"path/filepath"
)
var (
// CommandLine is the default Kingpin parser.
CommandLine = New(filepath.Base(os.Args[0]), "")
)
// Command adds a new command to the default parser.
func Command(name, help string) *CmdClause {
return CommandLine.Command(name, help)
}
// Flag adds a new flag to the default parser.
func Flag(name, help string) *Clause {
return CommandLine.Flag(name, help)
}
// Arg adds a new argument to the top-level of the default parser.
func Arg(name, help string) *Clause {
return CommandLine.Arg(name, help)
}
// Struct creates a command-line from a struct.
func Struct(v interface{}) *Application {
err := CommandLine.Struct(v)
FatalIfError(err, "")
return CommandLine
}
// Parse and return the selected command. Will call the termination handler if
// an error is encountered.
func Parse() string {
selected := MustParse(CommandLine.Parse(os.Args[1:]))
if selected == "" && CommandLine.cmdGroup.have() {
Usage()
CommandLine.terminate(0)
}
return selected
}
// Errorf prints an error message to stderr.
func Errorf(format string, args ...interface{}) {
CommandLine.Errorf(format, args...)
}
// Fatalf prints an error message to stderr and exits.
func Fatalf(format string, args ...interface{}) {
CommandLine.Fatalf(format, args...)
}
// FatalIfError prints an error and exits if err is not nil. The error is printed
// with the given prefix.
func FatalIfError(err error, format string, args ...interface{}) {
CommandLine.FatalIfError(err, format, args...)
}
// FatalUsage prints an error message followed by usage information, then
// exits with a non-zero status.
func FatalUsage(format string, args ...interface{}) {
CommandLine.FatalUsage(format, args...)
}
// FatalUsageContext writes a printf formatted error message to stderr, then
// usage information for the given ParseContext, before exiting.
func FatalUsageContext(context *ParseContext, format string, args ...interface{}) {
CommandLine.FatalUsageContext(context, format, args...)
}
// Usage prints usage to stderr.
func Usage() {
CommandLine.Usage(os.Args[1:])
}
// UsageTemplate associates a template with a flag. The flag must be a Bool() and must
// already be defined.
func UsageTemplate(template string) *Application {
return CommandLine.UsageTemplate(template)
}
// MustParse can be used with app.Parse(args) to exit with an error if parsing fails.
func MustParse(command string, err error) string {
if err != nil {
Fatalf(T("{{.Arg0}}, try --help", V{"Arg0": err}))
}
return command
}
// Version adds a flag for displaying the application version number.
func Version(version string) *Application {
return CommandLine.Version(version)
}
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