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|
package main
import (
"flag"
"fmt"
"os"
"github.com/wildducktheories/go-csv"
)
func configure(args []string) (*csv.SelectProcess, error) {
flags := flag.NewFlagSet("csv-select", flag.ExitOnError)
var key string
var permuteOnly bool
flags.StringVar(&key, "key", "", "The fields to copy into the output stream")
flags.BoolVar(&permuteOnly, "permute-only", false, "Preserve all the fields of the input, but put the specified keys first")
if err := flags.Parse(args); err != nil {
return nil, err
}
usage := func() {
fmt.Printf("usage: csv-select {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")
}
return &csv.SelectProcess{
Keys: keys,
PermuteOnly: permuteOnly,
}, nil
}
func main() {
var p *csv.SelectProcess
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)
}
}
|
