A calculator plugin that evaluates mathematical expressions and copies results to clipboard

Calculator Plugin for DMS Launcher

A launcher plugin that evaluates mathematical expressions and copies results to the clipboard.

Features

• Real-time calculation: Type mathematical expressions directly in the launcher
• Default prefix: Uses = as the default trigger prefix (configurable)
• Safe evaluation: Only allows mathematical operations, preventing code injection
• Clipboard integration: Press Enter to copy the result to clipboard
• Multiple operations: Supports +, -, *, /, ^, %, and parentheses

Installation

Via DMS

dms plugins install Calculator

Via DMS GUI

• Mod + ,
• Go to Plugins Tab
• Choose Browse
• Enable third party
• install Calculator

Manually

cd ~/.config/DankMaterialShell/plugins
git clone https://github.com/rochacbruno/DankCalculator Calculator

1. Open DMS Settings (Ctrl+,)
2. Navigate to Plugins tab
3. Click "Scan for Plugins"
4. Enable the "Calculator" plugin with the toggle switch

Usage

With Default Settings (= Prefix)

1. Open the launcher (Ctrl+Space)
2. Type the = prefix followed by a mathematical expression: = 3 + 3
3. The result (6) appears as a launcher item
4. Press Enter to copy the result to clipboard

Customizing the Trigger

You can configure a different trigger prefix or disable it entirely in the settings:

1. Open Settings → Plugins → Calculator
2. Change the trigger to a custom value (e.g., calc, c, math)
3. Or check "No trigger (always active)" to remove the prefix requirement
4. In the launcher, type your configured trigger: calc 3 + 3 or just 3 + 3 (if no trigger)
5. Press Enter to copy the result

Adding a keybinding (niri)

binds {
      Mod+Shift+C hotkey-overlay-title="Calculator" {
        spawn "dms" "ipc" "call" "spotlight" "openQuery" "=";
    }
}

Supported Operations

• Addition: = 3 + 3 → 6
• Subtraction: = 10 - 5 → 5
• Multiplication: = 4 * 7 → 28
• Division: = 20 / 4 → 5
• Exponentiation: = 2 ^ 8 → 256
• Modulo: = 17 % 5 → 2
• Parentheses: = (5 + 3) * 2 → 16
• Decimals: = 3.14 * 2 → 6.28
• Complex: = (10 + 5) * 2 - 3 / 3 → 29

Examples

Security

The calculator uses safe expression evaluation:

• Only allows numbers, operators (+, -, *, /, ^, %), parentheses, and dots
• Rejects any expressions with letters or special characters (except operators)
• Prevents code injection by validating input before evaluation

Files

• plugin.json - Plugin manifest
• CalculatorLauncher.qml - Main launcher component
• CalculatorSettings.qml - Settings UI
• calculator.js - Safe expression evaluation logic
• README.md - This file

Configuration

Settings are stored in ~/.config/DankMaterialShell/plugin_settings.json under the calculator plugin key:

{
  "pluginSettings": {
    "calculator": {
      "trigger": "=",
      "noTrigger": false
    }
  }
}

Troubleshooting

Calculator items don't appear:

• Make sure the plugin is enabled in Settings → Plugins
• Check that you're typing a valid mathematical expression
• Try disabling "No trigger" and setting a specific trigger

Result shows wrong value:

• JavaScript has floating-point precision limitations
• Very large or very small numbers may use scientific notation

Copy to clipboard doesn't work:

• Make sure your system clipboard is accessible
• Check console for error messages

Version

1.0.0

Author

Bruno Cesar Rocha

License

Same as DankMaterialShell