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main.go
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main.go
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package main
import (
"encoding/csv"
"encoding/json"
"errors"
"log"
"os"
)
func readHeader(row []string) []string {
headers := []string{}
for _, v := range row {
headers = append(headers, v)
}
return headers
}
func readRow(row []string, header []string) (map[string]string, error) {
if len(row) != len(header) {
return nil, errors.New("row and header do not have the same lengths")
}
newRow := map[string]string{}
for i := range row {
newRow[header[i]] = row[i]
}
return newRow, nil
}
func readCsv(filename string) ([]map[string]string, error) {
f, err := os.Open(os.Args[1])
if err != nil {
return nil, err
}
defer f.Close()
rdr := csv.NewReader(f)
dataBytes, err := rdr.ReadAll()
if err != nil {
return nil, err
}
data := []map[string]string{}
headers := readHeader(dataBytes[0])
for _, v := range dataBytes[1:] {
newRow, err := readRow(v, headers)
if err != nil {
return nil, err
}
data = append(data, newRow)
}
return data, nil
}
func main() {
if len(os.Args) < 2 {
log.Fatalln("Usage:", os.Args[0], "<csv filename>")
}
w, err := os.Create("table.json")
if err != nil {
log.Fatalln(err.Error())
}
defer w.Close()
data, err := readCsv(os.Args[1])
err = json.NewEncoder(w).Encode(data)
if err != nil {
log.Fatalln(err.Error())
}
}