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
|
package main
import (
"flag"
"fmt"
"os"
"github.com/wildducktheories/go-csv"
"github.com/wildducktheories/go-csv/utils"
)
func configure(args []string) (*csv.SortProcess, error) {
flags := flag.NewFlagSet("csv-sort", flag.ExitOnError)
var key string
var numericKey string
var reverseKey string
flags.StringVar(&key, "key", "", "The columns used to sort the input stream by.")
flags.StringVar(&numericKey, "numeric", "", "The specified columns are treated as numeric strings.")
flags.StringVar(&reverseKey, "reverse", "", "The specified columns are sorted in reverse order.")
if err := flags.Parse(args); err != nil {
return nil, err
}
usage := func() {
fmt.Printf("usage: csv-sort {options}\n")
flags.PrintDefaults()
}
// Use a CSV parser to extract the partial keys from the parameter
keys, err := csv.Parse(key)
if err != nil || len(keys) < 1 {
usage()
return nil, fmt.Errorf("--key must specify one or more columns.")
}
numeric, err := csv.Parse(numericKey)
if err != nil && len(numericKey) > 0 {
usage()
return nil, fmt.Errorf("--numeric must specify the list of numeric keys.")
}
reversed, err := csv.Parse(reverseKey)
if err != nil && len(reversed) > 0 {
usage()
return nil, fmt.Errorf("--reverse must specify the list of keys to be sorted in reverse order.")
}
if i, _, _ := utils.Intersect(keys, numeric); len(i) < len(numeric) {
return nil, fmt.Errorf("--numeric must be a strict subset of --key")
}
if i, _, _ := utils.Intersect(keys, reversed); len(i) < len(reversed) {
return nil, fmt.Errorf("--reverse must be a strict subset of --key")
}
return (&csv.SortKeys{Keys: keys, Numeric: numeric, Reversed: reversed}).AsSortProcess(), nil
}
func main() {
var p *csv.SortProcess
var err error
var errCh = make(chan error, 1)
if p, err = configure(os.Args[1:]); err == nil {
p.Run(csv.WithIoReader(os.Stdin), csv.WithIoWriter(os.Stdout), errCh)
err = <-errCh
}
if err != nil {
fmt.Printf("fatal: %v\n", err)
os.Exit(1)
}
}
|
