ui

package
v0.15.0 Latest Latest
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 Go to latest Published: Jan 24, 2021 License: BSD-2-Clause Imports: 8 Imported by: 0

Documentation

Overview

Package ui contains types that may be used by different editor frontends.

Index

Constants

View Source 
const (
	// DefaultBindingRune is a special value to represent a default binding.
	DefaultBindingRune rune = iota - functionKeyOffset

	F1
	F2
	F3
	F4
	F5
	F6
	F7
	F8
	F9
	F10
	F11
	F12

	Up
	Down
	Right
	Left

	Home
	Insert
	Delete
	End
	PageUp
	PageDown

	// Function key names that are aliases for their ASCII representation.
	Tab       = '\t'
	Enter     = '\n'
	Backspace = 0x7f
)

Special negative runes to represent function keys, used in the Rune field of the Key struct. This also has a few function names that are aliases for simple runes. See keyNames below for mapping these values to strings.

Variables

View Source 
var Default = Key{DefaultBindingRune, 0}

Default is used in the key binding table to indicate a default binding.

Functions

This section is empty.

Types

type Color 

type Color interface {
	String() string
	// contains filtered or unexported methods
}

Color represents a color. 

var (
	Black   Color = ansiColor(0)
	Red     Color = ansiColor(1)
	Green   Color = ansiColor(2)
	Yellow  Color = ansiColor(3)
	Blue    Color = ansiColor(4)
	Magenta Color = ansiColor(5)
	Cyan    Color = ansiColor(6)
	White   Color = ansiColor(7)

	BrightBlack   Color = ansiBrightColor(0)
	BrightRed     Color = ansiBrightColor(1)
	BrightGreen   Color = ansiBrightColor(2)
	BrightYellow  Color = ansiBrightColor(3)
	BrightBlue    Color = ansiBrightColor(4)
	BrightMagenta Color = ansiBrightColor(5)
	BrightCyan    Color = ansiBrightColor(6)
	BrightWhite   Color = ansiBrightColor(7)
)

Builtin ANSI colors.

func TrueColor 

func TrueColor(r, g, b uint8) Color

TrueColor returns a 24-bit true color.

func XTerm256Color 

func XTerm256Color(i uint8) Color

XTerm256Color returns a color from the xterm 256-color palette.

type Key 

type Key struct {
	Rune rune
	Mod  Mod
}

Key represents a single keyboard input, typically assembled from a escape sequence.

func K 

func K(r rune, mods ...Mod) Key

K constructs a new Key.

func ParseKey added in v0.14.0 

func ParseKey(s string) (Key, error)

ParseKey parses a symbolic key. The syntax is: 

Key = { Mod ('+' | '-') } BareKey

BareKey = FunctionKeyName | SingleRune

func (Key) Equal 

func (k Key) Equal(other interface{}) bool

func (Key) Hash 

func (k Key) Hash() uint32

func (Key) Kind 

func (k Key) Kind() string

func (Key) Repr 

func (k Key) Repr(int) string

func (Key) String 

func (k Key) String() string

type Keys 

type Keys []Key

Keys implements sort.Interface.

func (Keys) Len 

func (ks Keys) Len() int

func (Keys) Less 

func (ks Keys) Less(i, j int) bool

func (Keys) Swap 

func (ks Keys) Swap(i, j int)

type Mod 

type Mod byte

Mod represents a modifier key. 

const (
	// Shift is the shift modifier. It is only applied to special keys (e.g.
	// Shift-F1). For instance 'A' and '@' which are typically entered with the
	// shift key pressed, are not considered to be shift-modified.
	Shift Mod = 1 << iota
	// Alt is the alt modifier, traditionally known as the meta modifier.
	Alt
	Ctrl
)

Values for Mod.

type RuneStylesheet 

type RuneStylesheet map[rune]Styling

RuneStylesheet maps runes to stylings.

type Segment 

type Segment struct {
	Style
	Text string
}

Segment is a string that has some style applied to it.

func StyleSegment 

func StyleSegment(seg *Segment, ts ...Styling) *Segment

StyleSegment returns a new Segment with the given Styling's applied. It does not modify the given Segment.

func (*Segment) Clone 

func (s *Segment) Clone() *Segment

Clone returns a copy of the Segment.

func (*Segment) Concat 

func (s *Segment) Concat(v interface{}) (interface{}, error)

Concat implements Segment+string, Segment+float64, Segment+Segment and Segment+Text.

func (*Segment) CountRune 

func (s *Segment) CountRune(r rune) int

CountRune counts the number of times a rune occurs in a Segment.

func (*Segment) Index 

func (s *Segment) Index(k interface{}) (v interface{}, ok bool)

Index provides access to the attributes of a styled-segment.

func (*Segment) IterateKeys 

func (*Segment) IterateKeys(fn func(v interface{}) bool)

IterateKeys feeds the function with all valid attributes of styled-segment.

func (*Segment) Kind 

func (*Segment) Kind() string

Kind returns "styled-segment".

func (*Segment) RConcat 

func (s *Segment) RConcat(v interface{}) (interface{}, error)

RConcat implements string+Segment and float64+Segment.

func (*Segment) Repr 

func (s *Segment) Repr(int) string

Repr returns the representation of this Segment. The string can be used to construct an identical Segment. Unset or default attributes are skipped. If the Segment represents an unstyled string only this string is returned.

func (*Segment) SplitByRune 

func (s *Segment) SplitByRune(r rune) []*Segment

SplitByRune splits a Segment by the given rune.

func (*Segment) String 

func (s *Segment) String() string

String returns a string representation of the styled segment. This now always assumes VT-style terminal output. TODO: Make string conversion sensible to environment, e.g. use HTML when output is web.

func (*Segment) VTString 

func (s *Segment) VTString() string

VTString renders the styled segment using VT-style escape sequences.

type Style 

type Style struct {
	Foreground Color
	Background Color
	Bold       bool
	Dim        bool
	Italic     bool
	Underlined bool
	Blink      bool
	Inverse    bool
}

Style specifies how something (mostly a string) shall be displayed.

func ApplyStyling 

func ApplyStyling(s Style, ts ...Styling) Style

ApplyStyling returns a new Style with the given Styling's applied.

func StyleFromSGR 

func StyleFromSGR(s string) Style

StyleFromSGR builds a Style from an SGR sequence.

func (*Style) MergeFromOptions added in v0.14.0 

func (s *Style) MergeFromOptions(options map[string]interface{}) error

MergeFromOptions merges all recognized values from a map to the current Style.

func (Style) SGR 

func (s Style) SGR() string

SGR returns SGR sequence for the style.

type Styling 

type Styling interface {
	// contains filtered or unexported methods
}

Styling specifies how to change a Style. It can also be applied to a Segment or Text. 

var (
	Reset Styling = reset{}

	FgDefault Styling = setForeground{nil}

	FgBlack   Styling = setForeground{Black}
	FgRed     Styling = setForeground{Red}
	FgGreen   Styling = setForeground{Green}
	FgYellow  Styling = setForeground{Yellow}
	FgBlue    Styling = setForeground{Blue}
	FgMagenta Styling = setForeground{Magenta}
	FgCyan    Styling = setForeground{Cyan}
	FgWhite   Styling = setForeground{White}

	FgBrightBlack   Styling = setForeground{BrightBlack}
	FgBrightRed     Styling = setForeground{BrightRed}
	FgBrightGreen   Styling = setForeground{BrightGreen}
	FgBrightYellow  Styling = setForeground{BrightYellow}
	FgBrightBlue    Styling = setForeground{BrightBlue}
	FgBrightMagenta Styling = setForeground{BrightMagenta}
	FgBrightCyan    Styling = setForeground{BrightCyan}
	FgBrightWhite   Styling = setForeground{BrightWhite}

	BgDefault Styling = setBackground{nil}

	BgBlack   Styling = setBackground{Black}
	BgRed     Styling = setBackground{Red}
	BgGreen   Styling = setBackground{Green}
	BgYellow  Styling = setBackground{Yellow}
	BgBlue    Styling = setBackground{Blue}
	BgMagenta Styling = setBackground{Magenta}
	BgCyan    Styling = setBackground{Cyan}
	BgWhite   Styling = setBackground{White}

	BgBrightBlack   Styling = setBackground{BrightBlack}
	BgBrightRed     Styling = setBackground{BrightRed}
	BgBrightGreen   Styling = setBackground{BrightGreen}
	BgBrightYellow  Styling = setBackground{BrightYellow}
	BgBrightBlue    Styling = setBackground{BrightBlue}
	BgBrightMagenta Styling = setBackground{BrightMagenta}
	BgBrightCyan    Styling = setBackground{BrightCyan}
	BgBrightWhite   Styling = setBackground{BrightWhite}

	Bold       Styling = boolOn{boldField{}}
	Dim        Styling = boolOn{dimField{}}
	Italic     Styling = boolOn{italicField{}}
	Underlined Styling = boolOn{underlinedField{}}
	Blink      Styling = boolOn{blinkField{}}
	Inverse    Styling = boolOn{inverseField{}}

	NoBold       Styling = boolOff{boldField{}}
	NoDim        Styling = boolOff{dimField{}}
	NoItalic     Styling = boolOff{italicField{}}
	NoUnderlined Styling = boolOff{underlinedField{}}
	NoBlink      Styling = boolOff{blinkField{}}
	NoInverse    Styling = boolOff{inverseField{}}

	ToggleBold       Styling = boolToggle{boldField{}}
	ToggleDim        Styling = boolToggle{dimField{}}
	ToggleItalic     Styling = boolToggle{italicField{}}
	ToggleUnderlined Styling = boolToggle{underlinedField{}}
	ToggleBlink      Styling = boolToggle{blinkField{}}
	ToggleInverse    Styling = boolToggle{inverseField{}}
)

Common stylings.

func Bg added in v0.14.0 

func Bg(c Color) Styling

Bg returns a Styling that sets the background color.

func Fg added in v0.14.0 

func Fg(c Color) Styling

Fg returns a Styling that sets the foreground color.

func ParseStyling 

func ParseStyling(s string) Styling

ParseStyling parses a text representation of Styling, which are kebab case counterparts to the names of the builtin Styling's. For example, ToggleInverse is expressed as "toggle-inverse".

Multiple stylings can be joined by spaces, which is equivalent to calling Stylings.

If the given string is invalid, ParseStyling returns nil.

func StylingFromSGR added in v0.15.0 

func StylingFromSGR(s string) Styling

StylingFromSGR builds a Style from an SGR sequence.

func Stylings 

func Stylings(ts ...Styling) Styling

Stylings joins several transformers into one.

type Text 

type Text []*Segment

Text contains of a list of styled Segments.

func Concat added in v0.15.0 

func Concat(texts ...Text) Text

Concat concatenates multiple Text's into one.

func MarkLines 

func MarkLines(args ...interface{}) Text

MarkLines provides a way to construct a styled text by separating the content and the styling.

The arguments are groups of either

* A single string, in which case it represents an unstyled line;

  • Three arguments that can be passed to MarkLine, in which case they are passed to MarkLine and the return value is used as a styled line.

Lines represented by all the groups are joined together.

This function is mainly useful for constructing multi-line Text's with alignment across those lines. An example: 

var stylesheet = map[rune]string{
    '-': Reverse,
    'x': Stylings(Blue, BgGreen),
}
var text = FromMarkedLines(
    "foo      bar      foobar", stylesheet,
    "---      xxx      ------"
    "lorem    ipsum    dolar",
)

func MarkText 

func MarkText(line string, stylesheet RuneStylesheet, style string) Text

MarkText applies styles to all the runes in the line, using the runes in the style string. The stylesheet argument specifies which style each rune represents.

func ParseSGREscapedText added in v0.15.0 

func ParseSGREscapedText(s string) Text

ParseSGREscapedText parses SGR-escaped text into a Text. It also removes non-SGR CSI sequences sequences in the text.

func StyleText 

func StyleText(t Text, ts ...Styling) Text

StyleText returns a new Text with the given Styling's applied. It does not modify the given Text.

func T 

func T(s string, ts ...Styling) Text

T constructs a new Text with the given content and the given Styling's applied.

func (Text) Clone 

func (t Text) Clone() Text

Clone returns a deep copy of Text.

func (Text) Concat 

func (t Text) Concat(rhs interface{}) (interface{}, error)

Concat implements Text+string, Text+float64, Text+Segment and Text+Text.

func (Text) CountLines 

func (t Text) CountLines() int

CountLines counts the number of lines in a Text. It is equal to t.CountRune('\n') + 1.

func (Text) CountRune 

func (t Text) CountRune(r rune) int

CountRune counts the number of times a rune occurs in a Text.

func (Text) Index 

func (t Text) Index(k interface{}) (interface{}, error)

Index provides access to the underlying styled-segment.

func (Text) IterateKeys 

func (t Text) IterateKeys(fn func(interface{}) bool)

IterateKeys feeds the function with all valid indices of the styled-text.

func (Text) Kind 

func (Text) Kind() string

Kind returns "styled-text".

func (Text) Partition 

func (t Text) Partition(indices ...int) []Text

Partition partitions the Text at n indices into n+1 Text values.

func (Text) RConcat 

func (t Text) RConcat(lhs interface{}) (interface{}, error)

RConcat implements string+Text and float64+Text.

func (Text) Repr 

func (t Text) Repr(indent int) string

Repr returns the representation of the current Text. It is just a wrapper around the containing Segments.

func (Text) SplitByRune 

func (t Text) SplitByRune(r rune) []Text

SplitByRune splits a Text by the given rune.

func (Text) String 

func (t Text) String() string

String returns a string representation of the styled text. This now always assumes VT-style terminal output.

TODO: Make string conversion sensible to environment, e.g. use HTML when output is web.

func (Text) TrimWcwidth 

func (t Text) TrimWcwidth(wmax int) Text

TrimWcwidth returns the largest prefix of t that does not exceed the given visual width.

func (Text) VTString 

func (t Text) VTString() string

VTString renders the styled text using VT-style escape sequences.

Source Files

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