-
Notifications
You must be signed in to change notification settings - Fork 0
/
table.go
82 lines (66 loc) · 1.86 KB
/
table.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
package table
import (
"bytes"
"strings"
"text/template"
)
type Table struct {
columns []string
templates []*template.Template
data []interface{}
}
func (t *Table) AddColumn(header, format string) {
t.columns = append(t.columns, header)
tmpl, err := template.New("template for " + header).Parse(format)
if err != nil {
panic(err)
}
t.templates = append(t.templates, tmpl)
}
func (t *Table) AddRow(data interface{}) {
t.data = append(t.data, data)
}
func (t *Table) String() string {
columnWidths := make([]int, len(t.columns))
for i, column := range t.columns {
columnWidths[i] = len(column)
}
lines := make([][]string, 0, len(t.data))
buf := bytes.NewBuffer(nil)
for _, data := range t.data {
row := make([]string, len(t.templates))
for i, tmpl := range t.templates {
err := tmpl.Execute(buf, data)
if err != nil {
panic(err)
}
row[i] = buf.String()
buf.Reset()
if len(row[i]) > columnWidths[i] {
columnWidths[i] = len(row[i])
}
}
lines = append(lines, row)
}
result := strings.Builder{}
line := make([]string, len(t.columns))
for i, column := range t.columns {
leftPadding := (columnWidths[i] - len(column)) / 2
rightPadding := columnWidths[i] - len(column) - leftPadding
line[i] = strings.Repeat(" ", leftPadding+1) + column + strings.Repeat(" ", rightPadding+1)
}
result.WriteString(strings.Join(line, "|") + "\n")
for i, width := range columnWidths {
line[i] = strings.Repeat("-", width+2)
}
result.WriteString(strings.Join(line, "+") + "\n")
for _, row := range lines {
for i, column := range row {
leftPadding := (columnWidths[i] - len(column)) / 2
rightPadding := columnWidths[i] - len(column) - leftPadding
line[i] = strings.Repeat(" ", leftPadding+1) + column + strings.Repeat(" ", rightPadding+1)
}
result.WriteString(strings.Join(line, "|") + "\n")
}
return result.String()
}