ironbar/docs/Configuration guide.md

By default, you get a single bar at the bottom of all your screens.
To change that, you'll unsurprisingly need a config file.

## 1. Create config file

The config file lives inside the `ironbar` directory in your XDG_CONFIG_DIR, which is usually `~/.config/ironbar`.

Ironbar supports a range of configuration formats, so you can pick your favourite:

- `config.json`
- `config.toml`
- `config.yaml`
- `config.corn` (Experimental, includes variable support for re-using blocks.
  See [here](https://github.com/jakestanger/corn) for info)

You can also override the default config path using the `IRONBAR_CONFIG` environment variable.

## 2. Pick your use-case

Ironbar gives you a few ways to configure the bar to suit your needs.
This allows you to keep your config simple and relatively flat if your use-case is simple,
and make it more complex if required.

### a) I want the same bar across all monitors

Place the bar config inside the top-level object. This is automatically applied to each of your monitors.

<details>
<summary>JSON</summary>

```json
{
  "position": "bottom",
  "height": 42,
  "start": [],
  "center": [],
  "end": []
}
```

</details>

<details>
<summary>TOML</summary>

```toml
position = "bottom"
height = 42
start = []
center = []
end = []
```

</details>

<details>
<summary>YAML</summary>

```yaml
position: "bottom"
height: 42
start: [ ]
center: [ ]
end: [ ]
```

</details>

<details>
<summary>Corn</summary>

```
{
  position = "bottom"
  height = 42
  start = []
  center = []
  end = []
}
```

</details>

### b) I want my config to differ across one or more monitors

Create a map/object called `monitors` inside the top-level object.
Each of the map's keys should be an output name,
and each value should be an object containing the bar config.

To find your output names, run `wayland-info | grep wl_output -A1`.

<details>
<summary>JSON</summary>

```json
{
  "monitors": {
    "DP-1": {
      "start": []
    },
    "DP-2": {
      "position": "bottom",
      "height": 30,
      "start": []
    }
  }
}
```

</details>

<details>
<summary>TOML</summary>

```toml
[monitors]

[monitors.DP-1]
start = []

[monitors.DP-2]
position = "bottom"
height = 30
start = []
```

</details>

<details>
<summary>YAML</summary>

```yaml
monitors:
  DP-1:
    start: [ ]
  DP-2:
    position: "bottom"
    height: 30
    start: [ ]
```

</details>

<details>
<summary>Corn</summary>

```
{
  monitors.DP-1.start = []
  monitors.DP-2 = {
    position = "bottom"
    height = 30
    start = []
  }
}
```

</details>

### c) I want one or more monitors to have multiple bars

Create a map/object called `monitors` inside the top-level object.
Each of the map's keys should be an output name.
If you want the screen to have multiple bars, use an array of bar config objects.
If you want the screen to have a single bar, use an object.

To find your output names, run `wayland-info | grep wl_output -A1`.

<details>
<summary>JSON</summary>

```json
{
  "monitors": {
    "DP-1": [
      {
        "start": []
      },
      {
        "position": "top",
        "start": []
      }
    ],
    "DP-2": {
      "position": "bottom",
      "height": 30,
      "start": []
    }
  }
}
```

</details>

<details>
<summary>TOML</summary>

```toml
[monitors]

[[monitors.DP-1]]
start = []

[[monitors.DP-2]]
position = "top"
start = []

[monitors.DP-2]
position = "bottom"
height = 30
start = []
```

</details>

<details>
<summary>YAML</summary>

```yaml
monitors:
  DP-1:
    - start: [ ]
    - position: "top"
      start: [ ]
  DP-2:
    position: "bottom"
    height: 30
    start: [ ]
```

</details>

<details>
<summary>Corn</summary>

```
{
  monitors.DP-1 = [
    { start = [] }
    { position = "top" start = [] }
  ]
  monitors.DP-2 = {
    position = "bottom"
    height = 30
    start = []
  }
}
```

</details>

## 3. Write your bar config(s)

Once you have the basic config structure set up, it's time to actually configure your bar(s).

The following table describes each of the top-level bar config options. 
For details on available modules and each of their config options, check the sidebar.

| Name              | Type                                   | Default  | Description                                                                             |
|-------------------|----------------------------------------|----------|-----------------------------------------------------------------------------------------|
| `position`        | `top` or `bottom` or `left` or `right` | `bottom` | The bar's position on screen.                                                           |
| `anchor_to_edges` | `boolean`                              | `false`  | Whether to anchor the bar to the edges of the screen. Setting to false centres the bar. |
| `height`          | `integer`                              | `42`     | The bar's height in pixels.                                                             |
| `start`           | `Module[]`                             | `[]`     | Array of left or top modules.                                                           |
| `center`          | `Module[]`                             | `[]`     | Array of center modules.                                                                |
| `end`             | `Module[]`                             | `[]`     | Array of right or bottom modules.                                                       |

Check [here](config) for an example config file for a fully configured bar in each format.