Fantom-foundation/go-lachesis

package utils

import (
    "bufio"
    "strings"
)

// TextColumns join side-by-side.
func TextColumns(texts ...string) string {
    var (
        columns = make([][]string, len(texts))
        widthes = make([]int, len(texts))
    )

    for i, text := range texts {
        scanner := bufio.NewScanner(strings.NewReader(text))
        for scanner.Scan() {
            line := scanner.Text()
            columns[i] = append(columns[i], line)
            if widthes[i] < len([]rune(line)) {
                widthes[i] = len([]rune(line))
            }
        }
    }

    var (
        res strings.Builder
        j   int
    )
    for {
        eof := true
        for i := range columns {
            var s string
            if len(columns[i]) > j {
                s = columns[i][j]
                s = s + strings.Repeat(" ", widthes[i]-len([]rune(s)))
                eof = false
            } else {
                s = strings.Repeat(" ", widthes[i])
            }
            res.WriteString(s)
            res.WriteString("\t")
        }
        res.WriteString("\n")
        j++
        if eof {
            break
        }
    }

    return res.String()
}