Go templates

This page overviews how to use go-lang string-processing sytax - go-templates. Check description in the official site.

Set up

Obviously, you need go-lang to run Go templates, so this notebook requires a specific setup. It uses the gonb kernel to execute the code.

We don’t really need any other go-lang functions except go-templates, so the following cell defines a function t that takes template and prints the result of its execution to the standard output.

package main

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

func t(templateStr string, data ...interface{}) () {
	
	var tmplData interface{}
	if len(data) > 0 {
		tmplData = data[0]
	}

	tmpl, _ := template.New("tmpl").Parse(templateStr)
	tmpl.Execute(os.Stdout, tmplData)
}

The following cell shows how it can be used. Go templates are typically used to interpret data into a string. The function takes a template and data that need to be displayed using the template.

%%
t("Hello, {{.Name}}!", map[string]string{"Name": "Go"})

Hello, Go!

Access by key

You can access key-like elements of the data by using the syntax .<key>.

---

The following cell extracts val1 and val2 into the template.

%%
t(
	"Static text. var1: {{ .val1 }}. var2: {{ .val2 }}",
	map[string]string{"val1": "hello", "val2": "world"},
)

Static text. var1: hello. var2: world