go-examples/tpl-ex3/main.go

package main

import (
	"html/template"
	"io"
	"log"
	"net/http"
	"os"

	"meutel.net/meutel/go-examples/tpl-ex3/records"
)

type TplData struct {
	Columns []string
	Rows    []records.FinancialData
}

func printHTML(tpl *template.Template, cols []string, rows []records.FinancialData, out io.Writer) {
	tplData := TplData{
		cols,
		rows,
	}
	err := tpl.ExecuteTemplate(out, "tpl.html", tplData)
	if err != nil {
		panic(err)
	}
}

func main() {
	if len(os.Args) < 2 {
		log.Fatalln("Usage go-financial <file>")
	}

	// read input
	csv, err := os.Open(os.Args[1])
	if err != nil {
		log.Fatalln("Error reading file", err)
	}
	defer csv.Close()

	// parse data
	cols, rows := records.ReadCsv(csv)

	tpl, err := template.New("").Funcs(template.FuncMap{
		"class": func(index int) string {
			if index%2 == 0 {
				return "even"
			}
			return "odd"
		},
	}).ParseFiles("tpl.html", "script.js")
	if err != nil {
		panic(err)
	}
	http.HandleFunc("/", func(res http.ResponseWriter, req *http.Request) {
		printHTML(tpl, cols, rows, res)
	})
	http.ListenAndServe(":9000", nil)
}