reilua-enhanced/docs/ZED_EDITOR_SETUP.md

Zed Editor Setup for ReiLua

This guide explains how to set up autocomplete, type hints, and documentation for ReiLua in Zed Editor.

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Method 1: Using Lua Language Server (Recommended)

Zed uses the Lua Language Server (LuaLS) for Lua support. ReiLua includes tools/ReiLua_API.lua with LuaLS annotations.

Setup Steps

1. Install Lua Language Server in Zed

Zed should automatically install LuaLS when you open a Lua file. If not:

1. Open Zed
2. Go to Extensions (Cmd/Ctrl + Shift + X)
3. Search for "Lua"
4. Install the Lua extension

2. Configure Your Project

Create a .luarc.json file in your project root:

{
  "runtime.version": "Lua 5.4",
  "workspace.library": [
    "${3rd}/luassert/library",
    "${3rd}/busted/library"
  ],
  "completion.enable": true,
  "diagnostics.globals": [
    "RL"
  ],
  "workspace.checkThirdParty": false
}

3. Copy tools/ReiLua_API.lua to Your Project

Copy tools/ReiLua_API.lua to your game project folder:

# From ReiLua directory
cp tools/ReiLua_API.lua /path/to/your/game/project/

Or on Windows:

Copy-Item tools/ReiLua_API.lua "C:\path\to\your\game\project\"

4. (Optional) Create Library Directory

For better organization, create a library directory:

your-game/
├── main.lua
├── .luarc.json
└── .lua/
    └── tools/ReiLua_API.lua

Update .luarc.json:

{
  "runtime.version": "Lua 5.4",
  "workspace.library": [".lua"],
  "completion.enable": true,
  "diagnostics.globals": ["RL"],
  "workspace.checkThirdParty": false
}

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Method 2: Global Configuration (All Projects)

To make ReiLua API available for all projects:

Windows

1. Create directory: %USERPROFILE%\.luarocks\lib\lua\5.4\
2. Copy tools/ReiLua_API.lua to this directory
3. Add to global LuaLS config:

Location: %APPDATA%\Zed\settings.json or via Zed settings

{
  "lsp": {
    "lua-language-server": {
      "settings": {
        "Lua.workspace.library": [
          "C:\\Users\\YourName\\.luarocks\\lib\\lua\\5.4"
        ],
        "Lua.diagnostics.globals": ["RL"]
      }
    }
  }
}

Linux/macOS

1. Create directory: ~/.lua/reilua/
2. Copy tools/ReiLua_API.lua to this directory
3. Update Zed settings:

{
  "lsp": {
    "lua-language-server": {
      "settings": {
        "Lua.workspace.library": [
          "~/.lua/reilua"
        ],
        "Lua.diagnostics.globals": ["RL"]
      }
    }
  }
}

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Method 3: Using Zed's LSP Configuration

Create a .zed/settings.json in your project:

Note There is a sample zed settings json file in the repo root (zed.sample.settings.json)

{
  "lsp": {
    "lua-language-server": {
      "settings": {
        "Lua.runtime.version": "Lua 5.4",
        "Lua.workspace.library": [
          "."
        ],
        "Lua.completion.enable": true,
        "Lua.completion.callSnippet": "Replace",
        "Lua.completion.displayContext": 3,
        "Lua.diagnostics.globals": [
          "RL"
        ],
        "Lua.hint.enable": true,
        "Lua.hint.paramName": "All",
        "Lua.hint.setType": true
      }
    }
  }
}

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Verifying Setup

Create a test file test.lua:

function RL.init()
    -- Type "RL." and you should see autocomplete
    RL.SetWindowTitle("Test")  -- Should show documentation

    local color = RL.RED  -- Should autocomplete color constants

    -- Hover over functions to see documentation
    RL.DrawText("Hello", 10, 10, 20, color)
end

function RL.update(delta)
    -- 'delta' should show as number type
end

If autocomplete works, you should see:

• Function suggestions when typing RL.
• Parameter hints when calling functions
• Documentation on hover
• Constant values (RL.RED, RL.KEY_SPACE, etc.)

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Enhanced Features

Enable Inlay Hints

In Zed settings:

{
  "inlay_hints": {
    "enabled": true
  },
  "lsp": {
    "lua-language-server": {
      "settings": {
        "Lua.hint.enable": true,
        "Lua.hint.paramName": "All",
        "Lua.hint.setType": true,
        "Lua.hint.paramType": true
      }
    }
  }
}

This will show:

• Parameter names inline
• Variable types
• Return types

Disable Annoying Warnings

Add these to suppress common false positives:

{
  "lsp": {
    "lua-language-server": {
      "settings": {
        "Lua.diagnostics.disable": [
          "lowercase-global",
          "unused-local",
          "duplicate-set-field",
          "missing-fields",
          "undefined-field"
        ],
        "Lua.diagnostics.globals": ["RL"]
      }
    }
  }
}

Common warnings and what they mean:

• lowercase-global - Using global variables with lowercase names (RL is intentional)
• unused-local - Local variables that aren't used
• duplicate-set-field - Redefining functions (callback functions are expected to be redefined)
• missing-fields - Table fields that might not exist
• undefined-field - Accessing fields that aren't documented

Note: The tools/ReiLua_API.lua file now uses type annotations instead of function definitions for callbacks to prevent duplicate warnings.

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Troubleshooting

"duplicate-set-field" Error

Problem: Getting warnings like Duplicate field 'init'. (Lua Diagnostics. duplicate-set-field)

Why: The tools/ReiLua_API.lua file previously defined callback functions as empty function definitions. When you define them in your main.lua, LSP sees it as redefining the same field.

Solution: The latest tools/ReiLua_API.lua now uses type annotations instead:

-- Old way (caused warnings)
function RL.init() end

-- New way (no warnings)
---@type fun()
RL.init = nil

Fix Steps:

1. Update tools/ReiLua_API.lua - Copy the latest version from the repository
2. Or add to diagnostics.disable in your configuration:

   {
     "diagnostics.disable": ["duplicate-set-field"]
   }
   

3. Restart Zed to reload the configuration

Benefits of the new approach:

• No duplicate warnings
• Still get autocomplete
• Still get documentation on hover
• Still get type checking

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Autocomplete Not Working

1. Restart Zed after configuration changes
2. Check LSP Status: Look for Lua Language Server in bottom-right status bar
3. Verify File Location: Ensure tools/ReiLua_API.lua is in the workspace
4. Check Console: Open Zed's log to see LSP errors

Performance Issues

If the language server is slow:

{
  "lsp": {
    "lua-language-server": {
      "settings": {
        "Lua.workspace.maxPreload": 2000,
        "Lua.workspace.preloadFileSize": 1000
      }
    }
  }
}

Missing Documentation

Ensure hover is enabled:

{
  "hover_popover_enabled": true
}

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Advanced: Custom Annotations

You can extend tools/ReiLua_API.lua with your own game types:

---@class Player
---@field x number
---@field y number
---@field health number

---@class Enemy
---@field x number
---@field y number
---@field damage number

-- Your game globals
---@type Player
player = {}

---@type Enemy[]
enemies = {}

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Keyboard Shortcuts in Zed

• Trigger Autocomplete: Ctrl+Space (Windows/Linux) or Cmd+Space (macOS)
• Show Documentation: Hover or Ctrl+K Ctrl+I
• Go to Definition: F12 or Cmd+Click
• Find References: Shift+F12
• Rename Symbol: F2

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Additional Resources

• Lua Language Server GitHub
• LuaLS Annotations Guide
• Zed Documentation

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Example Project Structure

my-reilua-game/
├── .luarc.json              # LuaLS configuration
├── .zed/
│   └── settings.json        # Zed-specific settings
├── tools/ReiLua_API.lua           # API definitions (copy from ReiLua)
├── main.lua                 # Your game entry point
├── player.lua
├── enemy.lua
└── assets/
    ├── sprites/
    └── sounds/

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Quick Start Template

Save this as .luarc.json in your project:

{
  "runtime.version": "Lua 5.4",
  "completion.enable": true,
  "completion.callSnippet": "Replace",
  "diagnostics.globals": ["RL"],
  "diagnostics.disable": [
    "lowercase-global",
    "duplicate-set-field",
    "missing-fields"
  ],
  "workspace.checkThirdParty": false,
  "workspace.library": ["."],
  "hint.enable": true
}

Save this as .zed/settings.json:

{
  "lsp": {
    "lua-language-server": {
      "settings": {
        "Lua.hint.enable": true,
        "Lua.hint.paramName": "All",
        "Lua.hint.setType": true,
        "Lua.diagnostics.disable": [
          "lowercase-global",
          "duplicate-set-field",
          "missing-fields"
        ]
      }
    }
  },
  "inlay_hints": {
    "enabled": true
  }
}

Then copy tools/ReiLua_API.lua to your project root, and you're ready to go!

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Happy Coding!