output

package
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 Go to latest Published: Aug 18, 2026 License: MIT Imports: 13 Imported by: 1

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Constants

View Source 
const (
	FlagNameFormat        = "format"
	FlagNameNoColor       = "no-color"
	FlagNameVerbose       = "verbose"
	FlagNameVerbosity     = "verbosity"
	FlagNameQuiet         = "quiet"
	FlagNameOrder         = "order"
	FlagNameLimit         = "limit"
	FlagNameOffset        = "offset"
	FlagNameTableMaxWidth = "table-width"
)
View Source 
const TableRowSeparatorToken = "__melody_table_separator__"

Variables

This section is empty.

Functions

func ApplySortOrder added in v2.13.0 

func ApplySortOrder[T any](items []T, order SortOrder)

func DebugFlags 

func DebugFlags() []clicontract.Flag

DebugFlags returns StandardFlags with quiet defaulting to false: an introspection command exists to be read by a person, so the headers and context quiet suppresses are part of its answer.

func IsJsonFormat added in v2.13.0 

func IsJsonFormat(format Format) bool

IsJsonFormat answers for both json spellings, and every place that used to compare against FormatJson asks through it: the two differ in whitespace alone, so a site that recognises one and not the other would color a banner into a document, or print a table where a document was asked for.

func MergeFlags 

func MergeFlags(
	standard []clicontract.Flag,
	commandSpecific []clicontract.Flag,
) []clicontract.Flag

func Render 

func Render(
	writer io.Writer,
	envelope Envelope,
	option Option,
) error

func ReverseItems added in v2.13.0 

func ReverseItems[T any](items []T)

ReverseItems turns an ascending sort into a descending one in place. It runs before WindowItems so a descending --limit returns the tail of the ascending order rather than its head.

func SetApplicationVersion 

func SetApplicationVersion(versionString string)

SetApplicationVersion declares the running application's own version to every command envelope: the meta of each rendered document and the application row of debug:version read it. An application calls this once from its composition root before Run, with the version it keeps wherever it keeps it — its own ldflags variable, its environment, a file. Undeclared, the application version renders empty in the meta and as <unknown> in debug:version; nothing substitutes melody's version for it.

func StandardFlags 

func StandardFlags() []clicontract.Flag

StandardFlags returns the flag set every melody command accepts. Quiet defaults to true on purpose: a command's essential output — the document, table or summary the command exists to produce — is never gated on quiet, so the flag governs only headers and decoration, and the default keeps a scripted invocation clean without asking for it.

func WindowItems added in v2.13.0 

func WindowItems[T any](
	items []T,
	limit int,
	offset int,
) []T

Types

type Envelope 

type Envelope struct {
	Meta     Meta       `json:"meta"`
	Data     any        `json:"data"`
	Table    *TableData `json:"-"`
	Warnings []Warning  `json:"warnings"`
	Error    *Error     `json:"error"`
}

Envelope is not safe for concurrent use: a command that gathers warnings from parallel work funnels them through one goroutine rather than calling AddWarning from several.

func NewEnvelope 

func NewEnvelope(
	meta Meta,
) Envelope

func (*Envelope) AddWarning 

func (instance *Envelope) AddWarning(
	code string,
	message string,
	details map[string]any,
)

func (*Envelope) SetError 

func (instance *Envelope) SetError(
	code string,
	message string,
	details map[string]any,
	cause *ErrorCause,
)

type Error 

type Error struct {
	Code    string         `json:"code"`
	Message string         `json:"message"`
	Details map[string]any `json:"details"`
	Cause   *ErrorCause    `json:"cause"`
}

func NewError 

func NewError(code string, message string, details map[string]any, cause *ErrorCause) *Error

type ErrorCause 

type ErrorCause struct {
	Message string         `json:"message"`
	Details map[string]any `json:"details"`
}

func NewErrorCause 

func NewErrorCause(message string, details map[string]any) *ErrorCause

type Flags 

type Flags struct {
	Format  Format    `json:"format"`
	NoColor bool      `json:"noColor"`
	Verbose bool      `json:"verbose"`
	Quiet   bool      `json:"quiet"`
	Order   SortOrder `json:"order"`
	Limit   int       `json:"limit"`
	Offset  int       `json:"offset"`
}

type Format 

type Format string
const (
	FormatTable Format = "table"
	FormatJson  Format = "json"
	/* FormatJsonPretty is the same document indented for a person reading it by hand. It exists because json is the machine format and a machine reads a stream: one document per line, so a consumer can follow a long-running command live with a line reader and hand each line to a parser whole. Indenting by default made every document many lines, which every line-framed consumer — a log collector's json stage, a `while read line`, a `grep '"failed": true'` — receives as fragments that each fail to parse. */
	FormatJsonPretty Format = "json-pretty"
)

type JsonPrinter 

type JsonPrinter struct {
}

func (*JsonPrinter) Print 

func (instance *JsonPrinter) Print(
	writer io.Writer,
	envelope Envelope,
	option Option,
) error

the document is written on ONE line, terminated by the encoder's own newline, so a stream of them is a stream of records a line reader can hand to a parser whole — which is what a long-running command under --format=json is for, and what its own documentation promised while the indentation made every document a block of twenty. FormatJsonPretty is the same document with the indentation back, for the person reading it by hand; `| jq` does the same for a pipeline that already has it.

type ListPayload 

type ListPayload[T any] struct {
	Items  []T `json:"items"`
	Total  int `json:"total"`
	Limit  int `json:"limit"`
	Offset int `json:"offset"`
}

func NewListPayload 

func NewListPayload[T any](
	items []T,
	total int,
	limit int,
	offset int,
) ListPayload[T]

type Meta 

type Meta struct {
	Command              string    `json:"command"`
	Arguments            []string  `json:"arguments"`
	Flags                Flags     `json:"flags"`
	StartedAt            time.Time `json:"startedAt"`
	DurationMilliseconds int64     `json:"durationMilliseconds"`
	Version              Version   `json:"version"`
}

func NewMeta 

func NewMeta(
	command string,
	arguments []string,
	option Option,
	startedAt time.Time,
	duration time.Duration,
	version Version,
) Meta

type Option 

type Option struct {
	Format         Format
	NoColor        bool
	VerbosityLevel int
	Verbose        bool
	Quiet          bool
	Order          SortOrder
	Limit          int
	Offset         int
	TableMaxWidth  int
}

func DefaultOption 

func DefaultOption() Option

func NormalizeOption 

func NormalizeOption(option Option) Option

func ParseOptionFromCommand 

func ParseOptionFromCommand(commandContext *clicontract.CommandContext) Option

type Printer 

type Printer interface {
	Print(
		writer io.Writer,
		envelope Envelope,
		option Option,
	) error
}

func SelectPrinter 

func SelectPrinter(option Option) Printer

type SortOrder 

type SortOrder string
const (
	SortOrderAscending  SortOrder = "asc"
	SortOrderDescending SortOrder = "desc"
)

type TableBlock 

type TableBlock struct {
	Title   string
	Columns []string
	Rows    [][]string
}

type TableBlockBuilder 

type TableBlockBuilder struct {
	// contains filtered or unexported fields
}

func (*TableBlockBuilder) AddRow 

func (instance *TableBlockBuilder) AddRow(cells ...string) *TableBlockBuilder

type TableBuilder 

type TableBuilder struct {
	// contains filtered or unexported fields
}

TableBuilder is not safe for concurrent use: a command that assembles its table from parallel work funnels the rows through one goroutine — a channel the workers send to — rather than sharing the builder between them.

func NewTableBuilder 

func NewTableBuilder() *TableBuilder

func (*TableBuilder) AddBlock 

func (instance *TableBuilder) AddBlock(
	title string,
	columns []string,
) *TableBlockBuilder

func (*TableBuilder) AddSummaryLine 

func (instance *TableBuilder) AddSummaryLine(line string) *TableBuilder

func (*TableBuilder) Build 

func (instance *TableBuilder) Build() *TableData

type TableData 

type TableData struct {
	SummaryLines []string
	Blocks       []TableBlock
}

type TablePrinter 

type TablePrinter struct {
	// contains filtered or unexported fields
}

func NewDefaultTablePrinter 

func NewDefaultTablePrinter() *TablePrinter

func NewTablePrinter 

func NewTablePrinter(tableMaxWidth int) *TablePrinter

func (*TablePrinter) Print 

func (instance *TablePrinter) Print(
	writer io.Writer,
	envelope Envelope,
	option Option,
) error

type Version 

type Version struct {
	Application string `json:"application"`
	Melody      string `json:"melody"`
	Go          string `json:"go"`
}

type Warning 

type Warning struct {
	Code    string         `json:"code"`
	Message string         `json:"message"`
	Details map[string]any `json:"details"`
}

func NewWarning 

func NewWarning(code string, message string, details map[string]any) Warning

Source Files

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