Template glob funcs

This is an example Go program which demonstrates adding custom functions with Funcs and multiple templates with ParseGlob at the same time. It also demonstrates how to get array and other values within a range loop in the template.

package main

import (
        "fmt"
        "os"
        "text/template"
)

var tmplDir = "/home/ben/lemoda/go/template-glob-funcs/"

func GetArray(counts []int64, id int64) int64 {
        return counts[id]
}

func main() {
        numbers := []int64{0, 1, 2, 3, 4}
        data := []int64{0, 9, 18, 27, 36}
        var input struct {
                Data       []int64
                Numbers    []int64
                Multiplier int64
        }
        input.Numbers = numbers
        input.Data = data
        input.Multiplier = 9
        templates := template.New("example")
        customFunctions := template.FuncMap{"GetArray": GetArray}
        templates.Funcs(customFunctions)
        template.Must(templates.ParseGlob(tmplDir + "*.txt"))
        t := templates.Lookup("times-table.txt")
        err := t.Execute(os.Stdout, input)
        if err != nil {
                fmt.Printf("Error excuting template: %s\n", err.Error())
        }
}

(download)

The template looks like this:

{{- $array := .Data}}
{{- $mult := .Multiplier}}
{{- range $_, $number := .Numbers}}{{.}} × {{$mult}} = {{GetArray $array .}}
{{end -}}

The output of the example looks like this:

0 × 9 = 0
1 × 9 = 9
2 × 9 = 18
3 × 9 = 27
4 × 9 = 36