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package stringutil
// Wrap builds a byte slice from strs, wrapping on word boundaries before max chars
func Wrap(max int, strs ...string) []byte {
input := make([]byte, 0)
output := make([]byte, 0)
for _, s := range strs {
input = append(input, []byte(s)...)
}
if len(input) < max {
// Doesn't need to be wrapped
return input
}
ls := -1 // Last seen space index
lw := -1 // Last written byte index
ll := 0 // Length of current line
for i := 0; i < len(input); i++ {
ll++
switch input[i] {
case ' ', '\t':
ls = i
}
if ll >= max {
if ls >= 0 {
output = append(output, input[lw+1:ls]...)
output = append(output, '\r', '\n', ' ')
lw = ls // Jump over the space we broke on
ll = 1 // Count leading space above
// Rewind
i = lw + 1
ls = -1
}
}
}
return append(output, input[lw+1:]...)
}
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