oh-my-posh/website/docs/contributing/segment.md

id	title	sidebar_label
segment	Add Segment	Add Segment

Create the logic

Add a new file in the ./src/segments folder: new.go. Ensure New is a single verb indicating the context the segment renders.

You can use the following template as a guide.

package segments

import (
  "oh-my-posh/environment"
  "oh-my-posh/properties"
)

type New struct {
    props   properties.Properties
    env     environment.Environment

    Text string
}

const (
    //NewProp enables something
    NewProp properties.Property = "newprop"
)

func (n *new) Enabled() bool {
    return true
}

func (n *new) Template() string {
    return " {{.Text}} world "
}

func (n *new) Init(props properties.Properties, env environment.Environment) {
    n.props = props
    n.env = env

    n.Text = props.GetString(NewProp, "Hello")
}

When it comes to icon Properties, make sure to use the UTF32 representation (e.g. "\uEFF1") rather than the icon itself. This will facilitate the review process as not all environments display the icons based on the font being used. You can find these values and query for icons easily at Nerd Fonts.

For each segment, there's a single test file ensuring the functionality going forward. The convention is new_test.go, have a look at existing segment tests for inspiration. Oh My Posh makes use of the test tables pattern for all newly added tests. See this blog post for more information.

Create a name for your Segment

segment.go contains the list of available SegmentType's, which gives them a name we can map from the .json themes.

Add your segment.

// NEW is brand new
NEW SegmentType = "new"

Add the SegmentType mapping

Map your SegmentType to your Segment in the mapSegmentWithWriter function (respect the alphabetical order).

NEW: &New{},

Test your functionality

Even with unit tests, it's a good idea to build and validate the changes:

go build -o $GOPATH/bin/oh-my-posh

Add the documentation

Create a new markdown file underneath the docs/docs/segments folder called new.md. Use the following template as a guide.

---
id: new
title: New
sidebar_label: New
---

## What

Display something new.

## Sample Configuration

```json
{
  "type": "new",
  "style": "powerline",
  "powerline_symbol": "\uE0B0",
  "foreground": "#193549",
  "background": "#ffeb3b",
  "properties": {
    "newprop": "\uEFF1"
  }
}
```

## Properties

- newprop: `string` - the new text to show - defaults to `\uEFF1`

Map the new documentation in the sidebar

Open sidebars.js and add your document id (new) to the items of the Segments category.

Add the JSON schema

Edit the themes/schema.json file to add your segment.

At $.definitions.segment.properties.type.enum, add your SegmentType to the array:

new,

At $.definitions.segment.allOf, add your segment details:

{
  "if": {
    "properties": {
      "type": { "const": "new" }
    }
  },
  "then": {
    "title": "Display something new",
    "description": "https://ohmyposh.dev/docs/new",
    "properties": {
      "properties": {
        "properties": {
          "newprop": {
            "type": "string",
            "title": "New Property",
            "description": "the default text to display",
            "default": "Hello"
          }
        }
      }
    }
  }
}

Create a pull request

And be patient, I'm going as fast as I can 🏎