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package tui
import (
"fmt"
"io"
"regexp"
"strings"
"unicode/utf8"
)
var ansi = regexp.MustCompile("\033\\[(?:[0-9]{1,3}(?:;[0-9]{1,3})*)?[m|K]")
func viewLen(s string) int {
for _, m := range ansi.FindAllString(s, -1) {
s = strings.Replace(s, m, "", -1)
}
return utf8.RuneCountInString(s)
}
func maxLen(strings []string) int {
maxLen := 0
for _, s := range strings {
len := viewLen(s)
if len > maxLen {
maxLen = len
}
}
return maxLen
}
type alignment int
const (
alignLeft = alignment(0)
alignCenter = alignment(1)
alignRight = alignment(2)
)
func getPads(s string, maxLen int, align alignment) (lPad int, rPad int) {
len := viewLen(s)
diff := maxLen - len
if align == alignLeft {
lPad = 0
rPad = diff - lPad + 1
} else if align == alignCenter {
lPad = diff / 2
rPad = diff - lPad + 1
} /* else {
TODO
} */
return
}
func padded(s string, maxLen int, align alignment) string {
lPad, rPad := getPads(s, maxLen, align)
return fmt.Sprintf("%s%s%s", strings.Repeat(" ", lPad), s, strings.Repeat(" ", rPad))
}
func lineSeparator(num int, columns []string, rows [][]string) string {
lineSep := ""
first := ""
div := ""
end := ""
if num == 0 {
first = "┌"
div = "┬"
end = "┐"
} else if num == 1 {
first = "├"
div = "┼"
end = "┤"
} else if num == 2 {
first = "└"
div = "┴"
end = "┘"
}
for colIndex, colHeader := range columns {
column := []string{colHeader}
for _, row := range rows {
column = append(column, row[colIndex])
}
mLen := maxLen(column)
if colIndex == 0 {
lineSep += fmt.Sprintf(first+"%s", strings.Repeat("─", mLen+1))
} else {
lineSep += fmt.Sprintf(div+"%s", strings.Repeat("─", mLen+1))
}
}
lineSep += end
return lineSep
}
// Table accepts a slice of column labels and a 2d slice of rows
// and prints on the writer an ASCII based datagrid of such
// data.
func Table(w io.Writer, columns []string, rows [][]string) {
headers := make([]string, len(columns))
for i, col := range columns {
headers[i] = fmt.Sprintf(" %s", col)
}
cells := make([][]string, len(rows))
for i, row := range rows {
cells[i] = make([]string, len(row))
for j, cell := range row {
cells[i][j] = fmt.Sprintf(" %s", cell)
}
}
colPaddings := make([]int, 0)
for colIndex, colHeader := range headers {
column := []string{colHeader}
for _, row := range cells {
column = append(column, row[colIndex])
}
mLen := maxLen(column)
colPaddings = append(colPaddings, mLen)
}
table := "\n"
// header
table += fmt.Sprintf("%s\n", lineSeparator(0, headers, cells))
for colIndex, colHeader := range headers {
table += fmt.Sprintf("│%s", padded(colHeader, colPaddings[colIndex], alignCenter))
}
table += fmt.Sprintf("│\n")
table += fmt.Sprintf("%s\n", lineSeparator(1, headers, cells))
// rows
for _, row := range cells {
for colIndex, cell := range row {
table += fmt.Sprintf("│%s", padded(cell, colPaddings[colIndex], alignLeft))
}
table += fmt.Sprintf("│\n")
}
// footer
table += fmt.Sprintf("%s\n", lineSeparator(2, headers, cells))
fmt.Fprintf(w, "%s", table)
}
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