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package promptui
import (
"fmt"
"strconv"
"strings"
"text/template"
)
const esc = "\033["
type attribute int
// The possible state of text inside the application, either Bold, faint, italic or underline.
//
// These constants are called through the use of the Styler function.
const (
reset attribute = iota
FGBold
FGFaint
FGItalic
FGUnderline
)
// The possible colors of text inside the application.
//
// These constants are called through the use of the Styler function.
const (
FGBlack attribute = iota + 30
FGRed
FGGreen
FGYellow
FGBlue
FGMagenta
FGCyan
FGWhite
)
// The possible background colors of text inside the application.
//
// These constants are called through the use of the Styler function.
const (
BGBlack attribute = iota + 40
BGRed
BGGreen
BGYellow
BGBlue
BGMagenta
BGCyan
BGWhite
)
// ResetCode is the character code used to reset the terminal formatting
var ResetCode = fmt.Sprintf("%s%dm", esc, reset)
const (
hideCursor = esc + "?25l"
showCursor = esc + "?25h"
clearLine = esc + "2K"
)
// FuncMap defines template helpers for the output. It can be extended as a regular map.
//
// The functions inside the map link the state, color and background colors strings detected in templates to a Styler
// function that applies the given style using the corresponding constant.
var FuncMap = template.FuncMap{
"black": Styler(FGBlack),
"red": Styler(FGRed),
"green": Styler(FGGreen),
"yellow": Styler(FGYellow),
"blue": Styler(FGBlue),
"magenta": Styler(FGMagenta),
"cyan": Styler(FGCyan),
"white": Styler(FGWhite),
"bgBlack": Styler(BGBlack),
"bgRed": Styler(BGRed),
"bgGreen": Styler(BGGreen),
"bgYellow": Styler(BGYellow),
"bgBlue": Styler(BGBlue),
"bgMagenta": Styler(BGMagenta),
"bgCyan": Styler(BGCyan),
"bgWhite": Styler(BGWhite),
"bold": Styler(FGBold),
"faint": Styler(FGFaint),
"italic": Styler(FGItalic),
"underline": Styler(FGUnderline),
}
func upLine(n uint) string {
return movementCode(n, 'A')
}
func movementCode(n uint, code rune) string {
return esc + strconv.FormatUint(uint64(n), 10) + string(code)
}
// Styler is a function that accepts multiple possible styling transforms from the state,
// color and background colors constants and transforms them into a templated string
// to apply those styles in the CLI.
//
// The returned styling function accepts a string that will be extended with
// the wrapping function's styling attributes.
func Styler(attrs ...attribute) func(interface{}) string {
attrstrs := make([]string, len(attrs))
for i, v := range attrs {
attrstrs[i] = strconv.Itoa(int(v))
}
seq := strings.Join(attrstrs, ";")
return func(v interface{}) string {
end := ""
s, ok := v.(string)
if !ok || !strings.HasSuffix(s, ResetCode) {
end = ResetCode
}
return fmt.Sprintf("%s%sm%v%s", esc, seq, v, end)
}
}
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