goplate

goplate - yet another go template library

Fields are enclosed in double curly braces like regular Go templates:

{{ fieldName }}

Nested data structures use dot separators.

{{ fieldName.subStructure.field }}

Template syntax is fairly obvious - the names match roughly the JSON equivalent when marshalled. Names are case insensitive so {{ fieldName }} and {{ fieldname }} resolves to the same field.

Map access is limited to map[string]string only and map access is also fairly obvious if you are familiar with Go:

{{ mapName["name"] }}

Transformation functions

There is a few transformations available in the templates. This marshals the entire field as a JSON structure and includes it in the output

{{ fieldName | json }}

This formats an int64 nanosecond field to a string representation of the data:

{{ timestampField | asTime }}

This formats a byte buffer to a hex string:

{{ byteField | asHex }}

Usage

This will build a template and execute it:

type testStruct struct {
    Field1 int
    Field2 int
}

// ...

tmpl, err := New(`{{ field1 }}/{{ field2 }}`).
    WithParameters(&testStruct{}).
    Build()
if err != nil {
    panic()
}

buf := &bytes.Buffer{}
if err := tmpl.Execute(buf, &testStruct{Field1: 1, Field2: 2}) {
    panic()
}

// Print buffer
fmt.Println(buf.String())