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|
package text
import (
"bytes"
"strings"
"github.com/mattn/go-runewidth"
)
// Wrap a text for an exact line size
// Handle properly terminal color escape code
func Wrap(text string, lineWidth int) (string, int) {
return WrapLeftPadded(text, lineWidth, 0)
}
// Wrap a text for an exact line size with a left padding
// Handle properly terminal color escape code
func WrapLeftPadded(text string, lineWidth int, leftPad int) (string, int) {
var textBuffer bytes.Buffer
var lineBuffer bytes.Buffer
nbLine := 1
firstLine := true
pad := strings.Repeat(" ", leftPad)
// tabs are formatted as 4 spaces
text = strings.Replace(text, "\t", " ", 4)
for _, line := range strings.Split(text, "\n") {
spaceLeft := lineWidth - leftPad
if !firstLine {
textBuffer.WriteString("\n")
nbLine++
}
firstWord := true
for _, word := range strings.Split(line, " ") {
wordLength := wordLen(word)
if !firstWord {
lineBuffer.WriteString(" ")
spaceLeft -= 1
if spaceLeft <= 0 {
textBuffer.WriteString(pad + strings.TrimRight(lineBuffer.String(), " "))
textBuffer.WriteString("\n")
lineBuffer.Reset()
spaceLeft = lineWidth - leftPad
nbLine++
firstLine = false
}
}
// Word fit in the current line
if spaceLeft >= wordLength {
lineBuffer.WriteString(word)
spaceLeft -= wordLength
firstWord = false
} else {
// Break a word longer than a line
if wordLength > lineWidth {
for wordLength > 0 && wordLen(word) > 0 {
l := minInt(spaceLeft, wordLength)
part, leftover := splitWord(word, l)
word = leftover
wordLength = wordLen(word)
lineBuffer.WriteString(part)
textBuffer.WriteString(pad)
textBuffer.Write(lineBuffer.Bytes())
lineBuffer.Reset()
spaceLeft -= l
if spaceLeft <= 0 {
textBuffer.WriteString("\n")
nbLine++
spaceLeft = lineWidth - leftPad
}
if wordLength <= 0 {
break
}
}
} else {
// Normal break
textBuffer.WriteString(pad + strings.TrimRight(lineBuffer.String(), " "))
textBuffer.WriteString("\n")
lineBuffer.Reset()
lineBuffer.WriteString(word)
firstWord = false
spaceLeft = lineWidth - leftPad - wordLength
nbLine++
}
}
}
if lineBuffer.Len() > 0 {
textBuffer.WriteString(pad + strings.TrimRight(lineBuffer.String(), " "))
lineBuffer.Reset()
}
firstLine = false
}
return textBuffer.String(), nbLine
}
// wordLen return the length of a word, while ignoring the terminal escape sequences
func wordLen(word string) int {
length := 0
escape := false
for _, char := range word {
if char == '\x1b' {
escape = true
}
if !escape {
length += runewidth.RuneWidth(rune(char))
}
if char == 'm' {
escape = false
}
}
return length
}
// splitWord split a word at the given length, while ignoring the terminal escape sequences
func splitWord(word string, length int) (string, string) {
runes := []rune(word)
var result []rune
added := 0
escape := false
if length == 0 {
return "", word
}
for _, r := range runes {
if r == '\x1b' {
escape = true
}
width := runewidth.RuneWidth(r)
if width+added > length {
// wide character made the length overflow
break
}
result = append(result, r)
if !escape {
added += width
if added >= length {
break
}
}
if r == 'm' {
escape = false
}
}
leftover := runes[len(result):]
return string(result), string(leftover)
}
func minInt(a, b int) int {
if a > b {
return b
}
return a
}
|
