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|
package filesystem
import (
"bufio"
"encoding/csv"
"fmt"
"io"
"os"
"github.com/pkg/errors"
)
type lineHandler func(csvColumns []string)
func GenerateCSVLines(filePath string, handler lineHandler) error {
csvFile, err := os.Open(filePath)
if err != nil {
return errors.Wrap(
err,
fmt.Sprintf("Could not open %s", filePath),
)
}
reader := csv.NewReader(
bufio.NewReader(csvFile),
)
isFirstLine := true
for {
line, err := reader.Read()
if err == io.EOF {
break
} else if err != nil {
return errors.Wrap(
err,
fmt.Sprintf("Could not read line from file %s", filePath),
)
}
if !isFirstLine {
handler(line)
}
isFirstLine = false
}
return nil
}
func WriteCSVToFile(headerCols []string, rowsOfCols [][]string, filepath string) error {
file, err := os.Create(filepath)
if err != nil {
return err
}
defer file.Close()
writer := csv.NewWriter(file)
defer writer.Flush()
if err := writer.Write(headerCols); err != nil {
return err
}
return writer.WriteAll(rowsOfCols)
}
|
