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csvData.go
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csvData.go
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package main
import (
"encoding/csv"
"log"
"os"
)
type Record struct {
Name string
Surname string
Number string
LastAccess string
}
var myData = []Record{}
func readCSVFile(filepath string) ([][]string, error) {
_, err := os.Stat(filepath)
if err != nil {
return nil, err
}
f, err := os.Open(filepath)
if err != nil {
return nil, err
}
defer f.Close()
// CSV file read all at once
// lines is a [][]string variable
lines, err := csv.NewReader(f).ReadAll()
if err != nil {
return [][]string{}, err
}
return lines, nil
}
func saveCSVFile(filepath string) error {
csvfile, err := os.Create(filepath)
if err != nil {
return err
}
defer csvfile.Close()
csvwriter := csv.NewWriter(csvfile)
// Changing the default field delimiter to tab
csvwriter.Comma = '\t'
for _, row := range myData {
temp := []string{row.Name, row.Surname, row.Number, row.LastAccess}
err = csvwriter.Write(temp)
if err != nil {
return err
}
}
csvwriter.Flush()
return nil
}
func main() {
if len(os.Args) != 3 {
log.Println("csvData input output!")
os.Exit(1)
}
input := os.Args[1]
output := os.Args[2]
lines, err := readCSVFile(input)
if err != nil {
log.Println(err)
os.Exit(1)
}
// CSV data is read in columns - each line is a slice
for _, line := range lines {
temp := Record{
Name: line[0],
Surname: line[1],
Number: line[2],
LastAccess: line[3],
}
myData = append(myData, temp)
log.Println(temp)
}
err = saveCSVFile(output)
if err != nil {
log.Println(err)
os.Exit(1)
}
}