Why Go
- Case Studies
  
  Common problems companies solve with Go
- Use Cases
  
  Stories about how and why companies use Go
- Security
  
  How Go can help keep you secure by default
Learn
Docs
- Effective Go
  
  Tips for writing clear, performant, and idiomatic Go code
- Go User Manual
  
  A complete introduction to building software with Go
- Standard library
  
  Reference documentation for Go's standard library
- Release Notes
  
  Learn what's new in each Go release
Packages
Community
- Recorded Talks
  
  Videos from prior events
- Meetups
  
  Meet other local Go developers
- Conferences
  
  Learn and network with Go developers from around the world
- Go blog
  
  The Go project's official blog.
- Go project
  
  Get help and stay informed from Go
- Get connected

headless

package

Go to main page

Versions in this module

v0

v0.1.6

Jan 12, 2026

v0.1.5

Jan 10, 2026

v0.1.4

Jan 7, 2026

v0.1.3

Jan 6, 2026

Changes in this version

+ func FormatMappingNodeWithOptions(node *core.MappingNode, opts FormatMappingNodeOptions) string

+ type Condition interface

+ Description func() string

+ IsMet func() bool

+ func BoolFlagTrue(name string, value bool) Condition

+ func FlagEquals(f Flag, value string) Condition

+ func FlagPresent(f Flag) Condition

+ type FormatMappingNodeOptions struct

+ Indent string

+ PrettyPrint bool

type Requirement

+ func RequiredIf(condition Condition, target Flag) Requirement

+ func RequiredIfBool(condition Condition, targetName string, targetValue bool) Requirement

v0.1.2

Dec 10, 2025

Changes in this version

+ func DiagnosticLevelName(level DiagnosticLevel) string

+ func FormatMappingNode(node *core.MappingNode) string

+ func FormatScalarValue(scalar *core.ScalarValue) string

+ type DiagnosticLevel int

+ const DiagnosticLevelError

+ const DiagnosticLevelInfo

+ const DiagnosticLevelWarning

+ func DiagnosticLevelFromCore(level core.DiagnosticLevel) DiagnosticLevel

+ type PrefixedWriter struct

+ func NewPrefixedWriter(w io.Writer, prefix string) *PrefixedWriter

+ func (pw *PrefixedWriter) DoubleSeparator(width int)

+ func (pw *PrefixedWriter) Prefix() string

+ func (pw *PrefixedWriter) Printf(format string, args ...any)

+ func (pw *PrefixedWriter) Println(s string)

+ func (pw *PrefixedWriter) PrintlnEmpty()

+ func (pw *PrefixedWriter) Separator(char rune, width int)

+ func (pw *PrefixedWriter) SingleSeparator(width int)

+ func (pw *PrefixedWriter) Writer() io.Writer

+ type Printer struct

+ func NewPrinter(w *PrefixedWriter, width int) *Printer

+ func (p *Printer) CountSummary(count int, singular, plural, verb string)

+ func (p *Printer) Diagnostic(level string, message string, line, col int)

+ func (p *Printer) FieldAdd(path, value string)

+ func (p *Printer) FieldModify(path, oldValue, newValue string)

+ func (p *Printer) FieldRemove(path string)

+ func (p *Printer) ItemHeader(itemType, name, action string)

+ func (p *Printer) NextStep(description, command string)

+ func (p *Printer) NoChanges()

+ func (p *Printer) ProgressItem(icon, itemType, name, action, suffix string)

+ func (p *Printer) Width() int

+ func (p *Printer) Writer() *PrefixedWriter

v0.1.1

Dec 8, 2025

Changes in this version

+ func IsHeadless() bool

+ func SetHeadlessForTesting(headless bool) func()

+ func Validate(requirements ...Requirement) error

+ type Flag struct

+ IsDefault bool

+ Name string

+ Value string

+ type Requirement interface

+ Validate func() error

+ func OneOf(flags ...Flag) Requirement

+ func Required(f Flag) Requirement