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textutil.go
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textutil.go
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package clui
import (
xs "github.com/huandu/xstrings"
term "github.com/nsf/termbox-go"
"regexp"
"strings"
)
var (
colorMap = map[string]term.Attribute{
"default": term.ColorDefault,
"black": term.ColorBlack,
"red": term.ColorRed,
"green": term.ColorGreen,
"yellow": term.ColorYellow,
"blue": term.ColorBlue,
"magenta": term.ColorMagenta,
"cyan": term.ColorCyan,
"white": term.ColorWhite,
"bold": term.AttrBold,
"bright": term.AttrBold, // windows make color brighter when it is bold
"underline": term.AttrUnderline,
"underlined": term.AttrUnderline,
"reverse": term.AttrReverse,
}
)
// Ellipsize truncates text to maxWidth by replacing a
// substring in the middle with ellipsis and keeping
// the beginning and ending of the string untouched.
// If maxWidth is less than 5 then no ellipsis is
// added, the text is just truncated from the right.
func Ellipsize(str string, maxWidth int) string {
ln := xs.Len(str)
if ln <= maxWidth {
return str
}
if maxWidth < 5 {
return xs.Slice(str, 0, maxWidth)
}
left := int((maxWidth - 3) / 2)
right := maxWidth - left - 3
return xs.Slice(str, 0, left) + "..." + xs.Slice(str, ln-right, -1)
}
// CutText makes a text no longer than maxWidth
func CutText(str string, maxWidth int) string {
ln := xs.Len(str)
if ln <= maxWidth {
return str
}
return xs.Slice(str, 0, maxWidth)
}
// AlignText calculates the initial position of the text
// output depending on str length and available width.
// The str is truncated in case of its lenght greater than
// width. Function returns shift that should be added to
// original label position before output instead of padding
// the string with spaces. The reason is to make possible
// to draw a label aligned but with transparent beginning
// and ending. If you do not need transparency you can
// add spaces manually using the returned shift value
func AlignText(str string, width int, align Align) (shift int, out string) {
length := xs.Len(str)
if length >= width {
return 0, CutText(str, width)
}
if align == AlignRight {
return width - length, str
} else if align == AlignCenter {
return (width - length) / 2, str
}
return 0, str
}
// AlignColorizedText does the same as AlignText does but
// it preserves the color of the letters by adding correct
// color tags to the line beginning.
// Note: function is ineffective and a bit slow - do not use
// it everywhere
func AlignColorizedText(str string, width int, align Align) (int, string) {
rawText := UnColorizeText(str)
length := xs.Len(rawText)
if length <= width {
shift, _ := AlignText(rawText, width, align)
return shift, str
}
skip := 0
if align == AlignRight {
skip = length - width
} else if align == AlignCenter {
skip = (length - width) / 2
}
fgChanged, bgChanged := false, false
curr := 0
parser := NewColorParser(str, term.ColorBlack, term.ColorBlack)
out := ""
for curr < skip+width {
elem := parser.NextElement()
if elem.Type == ElemEndOfText {
break
}
if elem.Type == ElemPrintable {
curr++
if curr == skip+1 {
if fgChanged {
out += "<t:" + ColorToString(elem.Fg) + ">"
}
if bgChanged {
out += "<b:" + ColorToString(elem.Bg) + ">"
}
out += string(elem.Ch)
} else if curr > skip+1 {
out += string(elem.Ch)
}
} else if elem.Type == ElemTextColor {
fgChanged = true
if curr > skip+1 {
out += "<t:" + ColorToString(elem.Fg) + ">"
}
} else if elem.Type == ElemBackColor {
bgChanged = true
if curr > skip+1 {
out += "<b:" + ColorToString(elem.Bg) + ">"
}
}
}
return 0, out
}
// SliceColorized returns a slice of text with correct color
// tags. start and end are real printable rune indices
func SliceColorized(str string, start, end int) string {
if str == "" {
return str
}
if start < 0 {
start = 0
}
fgChanged, bgChanged := false, false
curr := 0
parser := NewColorParser(str, term.ColorBlack, term.ColorBlack)
var out string
for {
if end != -1 && curr >= end {
break
}
elem := parser.NextElement()
if elem.Type == ElemEndOfText {
break
}
switch elem.Type {
case ElemTextColor:
fgChanged = true
if out != "" {
out += "<t:" + ColorToString(elem.Fg) + ">"
}
case ElemBackColor:
bgChanged = true
if out != "" {
out += "<b:" + ColorToString(elem.Bg) + ">"
}
case ElemPrintable:
if curr == start {
if fgChanged {
out += "<t:" + ColorToString(elem.Fg) + ">"
}
if bgChanged {
out += "<b:" + ColorToString(elem.Bg) + ">"
}
}
if curr >= start {
out += string(elem.Ch)
}
curr++
}
}
return out
}
// UnColorizeText removes all color-related tags from the
// string. Tags to remove: <(f|t|b|c):.*>
func UnColorizeText(str string) string {
rx := regexp.MustCompile("<(f|c|t|b):[^>]*>")
return rx.ReplaceAllString(str, "")
}
// StringToColor returns attribute by its string description.
// Description is the list of attributes separated with
// spaces, plus or pipe symbols. You can use 8 base colors:
// black, white, red, green, blue, magenta, yellow, cyan
// and a few modifiers:
// bold or bright, underline or underlined, reverse
// Note: some terminals do not support all modifiers, e.g,
// Windows one understands only bold/bright - it makes the
// color brighter with the modidierA
// Examples: "red bold", "green+underline+bold"
func StringToColor(str string) term.Attribute {
var parts []string
if strings.ContainsRune(str, '+') {
parts = strings.Split(str, "+")
} else if strings.ContainsRune(str, '|') {
parts = strings.Split(str, "|")
} else if strings.ContainsRune(str, ' ') {
parts = strings.Split(str, " ")
} else {
parts = append(parts, str)
}
var clr term.Attribute
for _, item := range parts {
item = strings.Trim(item, " ")
item = strings.ToLower(item)
c, ok := colorMap[item]
if ok {
clr |= c
}
}
return clr
}
// GetColorMap returns the color map (id is the color name, value its code)
func GetColorMap() map[string]term.Attribute {
return colorMap
}
// SetColorMap sets a custom color map (id is the color name, value its code)
func SetColorMap(cmap map[string]term.Attribute) {
colorMap = cmap
}
// ColorToString returns string representation of the attribute
func ColorToString(attr term.Attribute) string {
var out string
rawClr := attr & 15
if rawClr < 8 {
for k, v := range colorMap {
if v == rawClr {
out += k + " "
break
}
}
}
if attr&term.AttrBold != 0 {
out += "bold "
}
if attr&term.AttrUnderline != 0 {
out += "underline "
}
if attr&term.AttrReverse != 0 {
out += "reverse "
}
return strings.TrimSpace(out)
}