# Big Chef

A Go-based tool for modifying XML, JSON, and text documents using XPath/JSONPath/Regex expressions and Lua transformations.

## Features

- **Multi-Format Processing**:
  - XML (XPath)
  - JSON (JSONPath) 
  - Text (Regex)
- **Node Value Modification**: Update text values in XML elements, JSON properties or text matches
- **Attribute Manipulation**: Modify XML attributes, JSON object keys or regex capture groups
- **Conditional Logic**: Apply transformations based on document content
- **Complex Operations**: 
  - Mathematical calculations
  - String manipulations
  - Date conversions
  - Structural changes
  - Whole ass Lua environment
- **Error Handling**: Comprehensive error detection for:
  - Invalid XML/JSON
  - Malformed XPath/JSONPath
  - Lua syntax errors

## Usage Examples

### 1. Basic field modification
```xml
<!-- Input -->
<price>44.95</price>

<!-- Command -->
chef -xml "//price" "v=v*2" input.xml

<!-- Output -->
<price>89.9</price>
```

### 2. Supports glob patterns
```xml
chef -xml "//price" "v=v*2" data/**.xml
```

### 3. Attribute Update
```xml
<!-- Input -->
<item price="10.50"/>

<!-- Command -->
chef -xml "//item/@price" "v=v*2" input.xml

<!-- Output --> 
<item price="21"/>
```

### 3. JSONPath Transformation
```json
// Input
{
  "products": [
    {"name": "Widget", "price": 19.99},
    {"name": "Gadget", "price": 29.99}
  ]
}

// Command
chef -json "$.products[*].price" "v=v*0.75" input.json

// Output
{
  "products": [
    {"name": "Widget", "price": 14.99},
    {"name": "Gadget", "price": 22.49}
  ]
}
```

### 4. Regex Text Replacement
Regex works slightly differently, up to 12 match groups are provided as v1..v12 and s1..s12 for numbers and strings respectively.
A special shorthand "!num" is also provided that simply expands to `(\d*\.?\d+)`.
```xml
<!-- Input -->
<description>Price: $15.00 Special Offer</description>

<!-- Command -->
chef "Price: $!num Special Offer" "v1 = v1 * 0.92" input.xml

<!-- Output -->
<description>Price: $13.80 Special Offer</description>
```

### 5. Conditional Transformation
```xml
<!-- Input -->
<item stock="5" price="10.00"/>

<!-- Command -->
chef -xml "//item" "if tonumber(v.stock) > 0 then v.price = v.price * 0.8 end" input.xml

<!-- Output -->
<item stock="5" price="8.00"/>
```

## Installation

```bash
go build -o chef main.go
```

```bash
# Process XML file
./chef -xml "//price" "v=v*1.2" input.xml

# Process JSON file 
./chef -json "$.prices[*]" "v=v*0.9" input.json
```