gocsv.go

//Simple CSV reader
package main

import (
	"encoding/csv" //Package csv reads and writes comma-separated values (CSV) files.
	"fmt"          //Package fmt implements formatted I/O with functions analogous to C's printf and scanf.
	"io"           //Package io provides basic interfaces to I/O primitives.
	"os"           //Package os provides a platform-independent interface to operating system functionality.
)

// Ref http://golang.org/pkg/ for more on packages and  links to documentation
func main() {
        //Check for command-line argument filename.
        //Ignore additional arguments.
	if len(os.Args) < 2 {
		fmt.Printf("Error: Source file name is required\n")
		fmt.Println("Usage:", os.Args[0], "<filename> \n")
		return
	}

	file, err := os.Open(os.Args[1])
	if err != nil {
		fmt.Println("Error:", err)
		return
	}
	// deferred call to Close() at the end of current method
	defer file.Close()
	//get a new cvsReader for reading file
	reader := csv.NewReader(file)
	//Configure reader options Ref http://golang.org/src/pkg/encoding/csv/reader.go?s=#L81
	reader.Comma = ';'          //field delimiter
	reader.Comment = '#'        //Comment character
	reader.FieldsPerRecord = -1 //Number of records per record. Set to Negative value for variable
	reader.TrimLeadingSpace = true

	lineCount := 1
	for {
		// read just one record, but we could ReadAll() as well
		record, err := reader.Read()
		// end-of-file is fitted into err
		if err == io.EOF {
			break
		} else if err != nil {
			fmt.Println("Error:", err)
			lineCount += 1
			reader.Read()
			continue
		}
		// record is array of strings Ref http://golang.org/src/pkg/encoding/csv/reader.go?s=#L134
		fmt.Printf("Record %d: %s\n", lineCount, record)
		lineCount += 1
	}
}