murex Shell Docs

API Reference: lang.MarshalData() (system API)

Converts structured memory into a murex data-type (eg for stdio)



b, err := lang.MarshalData(p, dataType, data)


func exampleCommand(p *lang.Process) error {
    data := map[string]string {
        "foo": "hello foo",
        "bar": "hello bar",

    dataType := "json"

    b, err := lang.MarshalData(p, dataType, data)
    if err != nil {
        return err

    _, err := p.Stdout.Write(b)
    return err


Go source file:

package lang

import (

// MarshalData is a global marshaller which should be called from within murex
// builtin commands (etc).
// See docs/apis/marshaldata.html for more details
func MarshalData(p *Process, dataType string, data interface{}) (b []byte, err error) {
    // This is one of the very few maps in Murex which isn't hidden behind a sync
    // lock of one description or other. The rational is that even mutexes can
    // add a noticeable overhead on the performance of tight loops and I expect
    // this function to be called _a lot_ while also only needing to be written
    // to via code residing in within builtin types init() function (ie while
    // murex is effectively single threaded). So there shouldn't be any data-
    // races -- PROVIDING developers strictly follow the pattern of only writing
    // to this map within init() func's.
    if Marshallers[dataType] == nil {
        return nil, errors.New("I don't know how to marshal `" + dataType + "`.")

    b, err = Marshallers[dataType](p, data)
    if err != nil {
        return nil, errors.New("[" + dataType + " marshaller] " + err.Error())



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

See Also

This site's content is rebuilt automatically from murex's source code after each merge to the master branch. Downloadable murex binaries are also built with the website.

Last built on Wed Jan 12 10:38:51 UTC 2022 against commit 50d6f4550d6f45b79e200b3cbc8e8e2639854a5265c7021.

Current version is 2.4.3010 BETA which has been verified against tests.