murex Shell Docs

API Reference: Marshal()

Converts structured memory into a structured file format (eg for stdio)


This is a function you would write when programming a murex data-type. The marshal function takes in a Go (golang) type or struct and returns a byte slice of a "string" representation of that format (eg in JSON) or an error.

This marshaller is then registered to murex inside an init() function and murex builtins can use that marshaller via the MarshalData() API.


Registering marshal (for writing builtin data-types)

// To avoid data races, this should only happen inside func init()
lang.Marshallers["json"] = marshal

Using an existing marshaller (eg inside a builtin command)

// See documentation on lang.MarshalData for more details
b, err := lang.MarshalData(p, dataType, data)


Defining a marshaller for a murex data-type

package example

import (


func init() {
    // Register data-type
    lang.Marshallers["json"] = marshal

// Describe marshaller
func marshal(p *lang.Process, v interface{}) ([]byte, error) {
    if p.Stdout.IsTTY() {
        // If STDOUT is a TTY (ie not pipe, text file or other destination other
        // than a terminal) then output JSON in an indented, human readable,
        // format....
        return json.MarshalIndent(v, "", "    ")

    // ....otherwise we might as well output it in a minified format
    return json.Marshal(v)


  1. *lang.Process: Process's runtime state. Typically expressed as the variable p
  2. interface{}: data you wish to marshal

See Also

This site is rebuilt weekly, the content is automatically generated from murex's source code. Last built on Mon Aug 3 06:12:53 UTC 2020 against commit 2557f7c2557f7cc7535c452c21d89164bd38ed8996f02fd. Downloadable murex binaries are also built weekly. Current version is 0.52.2000 BETA which has been verified against tests.