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package kong
import (
"fmt"
"os"
"reflect"
)
// ConfigFlag uses the configured (via kong.Configuration(loader)) configuration loader to load configuration
// from a file specified by a flag.
//
// Use this as a flag value to support loading of custom configuration via a flag.
type ConfigFlag string
// BeforeResolve adds a resolver.
func (c ConfigFlag) BeforeResolve(kong *Kong, ctx *Context, trace *Path) error {
if kong.loader == nil {
return fmt.Errorf("kong must be configured with kong.Configuration(...)")
}
path := string(ctx.FlagValue(trace.Flag).(ConfigFlag)) // nolint
resolver, err := kong.LoadConfig(path)
if err != nil {
return err
}
ctx.AddResolver(resolver)
return nil
}
// VersionFlag is a flag type that can be used to display a version number, stored in the "version" variable.
type VersionFlag bool
// BeforeReset writes the version variable and terminates with a 0 exit status.
func (v VersionFlag) BeforeReset(app *Kong, vars Vars) error {
fmt.Fprintln(app.Stdout, vars["version"])
app.Exit(0)
return nil
}
// ChangeDirFlag changes the current working directory to a path specified by a flag
// early in the parsing process, changing how other flags resolve relative paths.
//
// Use this flag to provide a "git -C" like functionality.
//
// It is not compatible with custom named decoders, e.g., existingdir.
type ChangeDirFlag string
// Decode is used to create a side effect of changing the current working directory.
func (c ChangeDirFlag) Decode(ctx *DecodeContext) error {
var path string
err := ctx.Scan.PopValueInto("string", &path)
if err != nil {
return err
}
path = ExpandPath(path)
ctx.Value.Target.Set(reflect.ValueOf(ChangeDirFlag(path)))
return os.Chdir(path)
}
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