oh-my-posh/website/docs/contributing/segment.mdx
2022-10-12 13:06:04 +02:00

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---
id: segment
title: Add Segment
sidebar_label: 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.
```go
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][nf-icons].
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][tests] for inspiration. Oh My Posh makes
use of the test tables pattern for all newly added tests. See [this][tables] blog post for more information.
## Create a name for your Segment
[`segment.go`][segment-go] contains the list of available `SegmentType`'s, which gives them a name we can map from the
`.json` [themes][themes].
Add your segment.
```go
// 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).
```go
NEW: &New{},
```
## Test your functionality
Even with unit tests, it's a good idea to build and validate the changes:
```shell
go build -o $GOPATH/bin/oh-my-posh
```
## Add the documentation
Create a new `markdown` file underneath the [`website/docs/segments`][docs] folder called `new.md`.
Use the following template as a guide.
````markdown
---
id: new
title: New
sidebar_label: New
---
## What
Display something new.
## Sample Configuration
```json
{
"type": "new",
"style": "powerline",
"powerline_symbol": "\uE0B0",
"foreground": "#193549",
"background": "#ffeb3b",
"properties": {
"newprop": "\uEFF1"
}
}
```
## Properties
| Name | Type | Description |
| --------- | -------- | ------------------------------------------- |
| `newprop` | `string` | the new text to show - defaults to `\uEFF1` |
````
## Map the new documentation in the sidebar
Open [`sidebars.js`][sidebars] and add your document id (`new`) to the items of the Segments category.
## Add the JSON schema
Edit the `themes/schema.json` file to add your segment.
At `$.definitions.segment.properties.type.enum`, add your `SegmentType` to the array:
```json
new,
```
At `$.definitions.segment.allOf`, add your segment details:
```json
{
"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 🏎
[segment-go]: https://github.com/JanDeDobbeleer/oh-my-posh/blob/main/src/engine/segment.go
[themes]: https://github.com/JanDeDobbeleer/oh-my-posh/tree/main/themes
[docs]: https://github.com/JanDeDobbeleer/oh-my-posh/tree/main/website/docs/segments
[sidebars]: https://github.com/JanDeDobbeleer/oh-my-posh/blob/main/website/sidebars.js
[nf-icons]: https://www.nerdfonts.com/cheat-sheet
[tests]: https://github.com/JanDeDobbeleer/oh-my-posh/blob/main/src/segments/az_test.go
[tables]: https://blog.alexellis.io/golang-writing-unit-tests/