museli/termenv#71 work-around

termenv.go

package main

import (
        "fmt"
        "strings"

        "github.com/mattn/go-runewidth"
        "github.com/muesli/termenv"
)

const URLAnchorSeq = "8;;%s\007%s"
const URLNameSeq = "%s8;;%s\007%s"

// Style is a string that various rendering styles can be applied to.
type Style struct {
        string
        url    string
        styles []string
}

// String returns a new Style.
func String(s ...string) Style {
        return Style{
                string: strings.Join(s, " "),
        }
}

func (t Style) String() string {
        return t.Styled(t.string)
}

// Styled renders s with all applied styles.
func (t Style) Styled(s string) string {
        if len(t.styles) == 0 {
                return s
        }

        seq := strings.Join(t.styles, ";")
        if seq == "" {
                return s
        }

        if t.url != "" {
                s = fmt.Sprintf("%s8;;%s\007%s%s8;;\007", termenv.OSC, t.url, s, termenv.OSC)
        }
        return fmt.Sprintf("%s%sm%s%sm", termenv.CSI, seq, s, termenv.CSI+termenv.ResetSeq)
}

// Foreground sets a foreground color.
func (t Style) Foreground(c termenv.Color) Style {
        if c != nil {
                t.styles = append(t.styles, c.Sequence(false))
        }
        return t
}

// Background sets a background color.
func (t Style) Background(c termenv.Color) Style {
        if c != nil {
                t.styles = append(t.styles, c.Sequence(true))
        }
        return t
}

// Bold enables bold rendering.
func (t Style) Bold() Style {
        t.styles = append(t.styles, termenv.BoldSeq)
        return t
}

// Faint enables faint rendering.
func (t Style) Faint() Style {
        t.styles = append(t.styles, termenv.FaintSeq)
        return t
}

// Italic enables italic rendering.
func (t Style) Italic() Style {
        t.styles = append(t.styles, termenv.ItalicSeq)
        return t
}

// Underline enables underline rendering.
func (t Style) Underline() Style {
        t.styles = append(t.styles, termenv.UnderlineSeq)
        return t
}

// Overline enables overline rendering.
func (t Style) Overline() Style {
        t.styles = append(t.styles, termenv.OverlineSeq)
        return t
}

// Blink enables blink mode.
func (t Style) Blink() Style {
        t.styles = append(t.styles, termenv.BlinkSeq)
        return t
}

// Reverse enables reverse color mode.
func (t Style) Reverse() Style {
        t.styles = append(t.styles, termenv.ReverseSeq)
        return t
}

// CrossOut enables crossed-out rendering.
func (t Style) CrossOut() Style {
        t.styles = append(t.styles, termenv.CrossOutSeq)
        return t
}

func (t Style) Anchor(url string) Style {
        t.url = url
        return t
}

// Width returns the width required to print all runes in Style.
func (t Style) Width() int {
        return runewidth.StringWidth(t.string)
}