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package main
import (
"encoding/json"
"flag"
"fmt"
"os"
"github.com/wildducktheories/go-csv"
)
func configure(args []string) (*csv.JsonToCsvProcess, error) {
var baseObject string
var columns string
flags := flag.NewFlagSet("json-to-csv", flag.ExitOnError)
flags.StringVar(&baseObject, "base-object-key", "", "The column into which the remainder of each JSON object is read.")
flags.StringVar(&columns, "columns", "", "The columns of the CSV file")
if err := flags.Parse(args); err != nil {
return nil, err
}
if columns == "" {
return nil, fmt.Errorf("fatal: a --columns parameter must be specified")
}
if header, err := csv.Parse(columns); err != nil {
return nil, fmt.Errorf("fatal: --columns could not be parsed as a CSV record")
} else {
return &csv.JsonToCsvProcess{
BaseObject: baseObject,
Header: header,
}, nil
}
}
func main() {
var p *csv.JsonToCsvProcess
var err error
if p, err = configure(os.Args[1:]); err == nil {
errCh := make(chan error, 1)
p.Run(json.NewDecoder(os.Stdin), csv.WithIoWriter(os.Stdout), errCh)
err = <-errCh
}
if err != nil {
fmt.Printf("fatal: %v\n", err)
os.Exit(1)
}
}
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