Niri Config Error: Unexpected Node In Output Sub-Item

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Niri Config Error: Unexpected Node in Output Sub-Item

Are you encountering an "unexpected node" error in your Niri configuration when defining sub-items within the output section? You're not alone! This article dives deep into this common issue, providing a comprehensive explanation and practical solutions to get your Niri setup back on track.

Understanding the Issue

The error message "unexpected node" typically arises when the Niri configuration parser encounters a syntax or structure that it doesn't recognize. In the specific case of sub-items within the output block, such as layout or hot-corners, this often points to an incompatibility between the configuration format and the expected structure.

The Problem in Detail

The issue stems from how Niri interprets the nested structure within the output block in your config.kdl file. When you define sub-items like layout or hot-corners directly under the output section, Niri's parser might not correctly process them as intended sub-configurations. This leads to the "unexpected node" error, halting the configuration loading process.

Let's break down the error message you encountered:

Error: Γ— unexpected node `layout`
╭─[config.kdl:97:1]
97 β”‚
98 β”‚ ╭─▢ layout {
99 β”‚ β”‚
100 β”‚ β”‚ default-column-width { proportion 1.0; }
101 β”‚ β”‚
102 β”‚ β”œβ”€β–Ά }

This snippet indicates that the Niri parser stumbled upon the layout node within the output context and deemed it unexpected. This typically occurs because the parser isn't designed to directly accommodate sub-items in that particular manner.

Diagnosing the Root Cause

Before diving into solutions, it's essential to pinpoint the precise cause of the error. Here's a breakdown of the common culprits:

  1. Incorrect Nesting: The most frequent cause is attempting to define sub-items directly within the output block without the necessary intermediate structure. Niri expects specific configurations to reside at particular levels of the hierarchy, and deviations can trigger the "unexpected node" error.
  2. Syntax Errors: Subtle syntax mistakes, such as misplaced braces, semicolons, or incorrect property names, can disrupt the parsing process and lead to misinterpretations of the configuration structure.
  3. Version Mismatch: In some cases, features or configuration options may be introduced or deprecated between Niri versions. Using a configuration style incompatible with your Niri version can result in errors.

Solutions and Workarounds

Now, let's explore the strategies to resolve the "unexpected node" error and properly configure your Niri setup.

1. Correct Nesting of Sub-Items

The core solution lies in adhering to Niri's expected configuration structure. Sub-items like layout and hot-corners generally shouldn't be defined directly under the output block. Instead, they typically belong at the root level of the configuration or within specific sub-sections.

In your case, the layout block causing the error should be moved outside the output section and placed at the top level of your config.kdl file. This ensures that Niri processes the layout settings as a global configuration rather than an output-specific one. The layout section contains settings that apply to the overall window arrangement and behavior, so it logically belongs at the top level.

layout {
    gaps 8
    center-focused-column "never"
    // ... other layout settings
}

output "HDMI-A-2" {
    backdrop-color "#003030ff"
    // ... other output settings
}

For hot-corners, which are part of the gestures configuration, ensure they are nested correctly within the gestures block at the top level:

gestures {
    hot-corners {
        off
    }
}

2. Verify Syntax and Structure

Double-check your config.kdl file for any syntax errors. Ensure that all blocks have matching opening and closing braces {}, properties are terminated with semicolons ;, and property names are spelled correctly. Even a minor typo can throw off the parser.

3. Consult Niri Documentation

Niri's official documentation is your best friend when it comes to understanding the correct configuration structure and syntax. Refer to the documentation for your specific Niri version to ensure you're using the appropriate configuration style.

4. Check Niri Version Compatibility

If you've recently upgraded or downgraded Niri, verify that your configuration file is compatible with the current version. Configuration formats can evolve, so adjustments might be necessary.

5. Example of Correct Configuration

Here's a snippet demonstrating the corrected structure:

input {
    // ... input settings
}

output "DP-2" {
    // ... output settings
}

output "HDMI-A-1" {
    // ... output settings
}

layout { // Moved outside output
    gaps 8
    center-focused-column "never"
    preset-column-widths {
        proportion 0.33333
        proportion 0.5
        proportion 0.66667
    }
    preset-window-heights {
        proportion 0.33333
        proportion 0.5
        proportion 0.66667
    }
    default-column-width { proportion 0.5; }
    focus-ring {
        width 3
        active-gradient from="#80c8ff01" to="#00ffffff" angle=45
    }
    border {
        off
        width 4
        active-color "#ffc87f"
        inactive-color "#505050"
        urgent-color "#9b0000"
    }
    shadow {
        softness 30
        spread 5
        offset x=0 y=5
        color "#0007"
    }
    struts {}
}

gestures {
    hot-corners { // Correctly nested under gestures
        off
    }
}

6. Using niri validate for Debugging

The niri validate command is your ally in detecting configuration issues. Run this command to receive detailed error messages that pinpoint problems in your config.kdl file. Pay close attention to the line numbers and error descriptions to swiftly identify and correct issues.

Step-by-Step Troubleshooting

  1. Run niri validate: This will immediately highlight syntax errors and structural problems in your configuration.
  2. Examine Error Messages: Carefully read the error messages. They usually indicate the type of error and the line number where it occurred.
  3. Verify Nesting: Ensure that all sub-items, such as layout and hot-corners, are placed within their appropriate parent blocks.
  4. Check Syntax: Look for missing semicolons, mismatched braces, and other syntax errors.
  5. Consult Documentation: Refer to the Niri documentation for the correct syntax and structure of configuration options.
  6. Test Incrementally: After making changes, run niri validate again to confirm that the errors have been resolved. Add configurations incrementally, validating each step, to avoid introducing multiple errors at once.

The Importance of Proper Configuration

A well-structured and valid Niri configuration is essential for a smooth and customized window management experience. By adhering to Niri's configuration guidelines and diligently troubleshooting errors, you can unlock the full potential of Niri and tailor it to your specific needs.

Final Thoughts

The "unexpected node" error in Niri configurations can be frustrating, but it's often a matter of incorrect nesting or syntax. By understanding the root cause and applying the solutions outlined in this guide, you can confidently resolve these errors and fine-tune your Niri setup. Remember to consult the official documentation, use niri validate for debugging, and test your changes incrementally. With a bit of patience and attention to detail, you'll be back to enjoying a streamlined and efficient window management experience in no time! Guys, happy configuring!