csv.go

package main

// Originally ripped from here: http://www.ostree.org/code-snippet/91/csv-comma-separated-values-example-in-golang and modified.

import (
	"encoding/csv"
	"fmt"
	"os"
	"unicode/utf8"
	"strings"
)

func maxInt(a int, b int) int {
	if a >= b {
		return a
	}
	return b
}

func main() {

	// Open file

	file, err := os.Open("./some-file.csv")

	if err != nil {
		fmt.Println("Error:", err)
		return
	}

	defer file.Close()

	// Grab CSV data

	reader := csv.NewReader(file)
	allRows, err := reader.ReadAll()

	if err != nil {
		fmt.Println("Error:", err)
		return
	}

	// Measure

	var widths []int

	for _, row := range allRows {

		for colNum, value := range row {
			if len(widths) < colNum+1 {
				widths = append(widths, len(value))
			} else {
				widths[colNum] = maxInt(widths[colNum], utf8.RuneCountInString(value))
			}
		}
	}

	// Dump

	for _, row := range allRows {
		for colNum, value := range row {
			fmt.Print("| " + value + " " + strings.Repeat(" ", widths[colNum]-utf8.RuneCountInString(value)+1))
		}
		fmt.Println()
	}
}