kubernetes/staging/src/k8s.io/kubectl/pkg/cmd/get/customcolumn.go

var jsonRegexp …

// RelaxedJSONPathExpression attempts to be flexible with JSONPath expressions, it accepts:
//   - metadata.name (no leading '.' or curly braces '{...}'
//   - {metadata.name} (no leading '.')
//   - .metadata.name (no curly braces '{...}')
//   - {.metadata.name} (complete expression)
//
// And transforms them all into a valid jsonpath expression:
//
//	{.metadata.name}
func RelaxedJSONPathExpression(pathExpression string) (string, error) { … }

// NewCustomColumnsPrinterFromSpec creates a custom columns printer from a comma separated list of <header>:<jsonpath-field-spec> pairs.
// e.g. NAME:metadata.name,API_VERSION:apiVersion creates a printer that prints:
//
//	NAME               API_VERSION
//	foo                bar
func NewCustomColumnsPrinterFromSpec(spec string, decoder runtime.Decoder, noHeaders bool) (*CustomColumnsPrinter, error) { … }

func splitOnWhitespace(line string) []string { … }

// NewCustomColumnsPrinterFromTemplate creates a custom columns printer from a template stream.  The template is expected
// to consist of two lines, whitespace separated.  The first line is the header line, the second line is the jsonpath field spec
// For example, the template below:
// NAME               API_VERSION
// {metadata.name}    {apiVersion}
func NewCustomColumnsPrinterFromTemplate(templateReader io.Reader, decoder runtime.Decoder) (*CustomColumnsPrinter, error) { … }

type Column …

type CustomColumnsPrinter …

func (s *CustomColumnsPrinter) PrintObj(obj runtime.Object, out io.Writer) error { … }

func (s *CustomColumnsPrinter) printOneObject(obj runtime.Object, parsers []*jsonpath.JSONPath, out io.Writer) error { … }