fileprepper-cli 0.2.2

FilePrepper

FilePrepper is a powerful C# library for processing and transforming CSV files. It provides a wide range of data manipulation tasks through a flexible and extensible architecture.

Features

Data Manipulation

• Add Columns: Add new columns with specified values
• Remove Columns: Remove specified columns from the dataset
• Rename Columns: Rename columns with a mapping dictionary
• Reorder Columns: Change the order of columns in the output
• Column Interaction: Perform operations between columns (add, subtract, multiply, divide, concatenate)

Data Transformation

• Data Type Convert: Convert column data types (string, integer, decimal, datetime, boolean)
• Date Extraction: Extract components from date columns (year, month, day, etc.)
• Fill Missing Values: Handle missing values with various methods (mean, median, mode, forward fill, etc.)
• Normalize Data: Normalize numeric columns using Min-Max or Z-score methods
• One Hot Encoding: Convert categorical variables into binary columns
• Scale Data: Scale numeric columns using Min-Max or Standardization methods
• Value Replace: Replace specific values in columns with new values

Data Analysis

• Aggregate: Perform grouping and aggregation operations (sum, average, count, min, max)
• Basic Statistics: Calculate various statistics (mean, standard deviation, percentiles, etc.)

Data Organization

• Drop Duplicates: Remove duplicate rows based on specified columns
• Filter Rows: Filter data based on various conditions
• Merge: Combine multiple CSV files (vertical/horizontal merge with different join types)
• Data Sampling: Sample data using different methods (random, systematic, stratified)

File Format Support

• File Format Convert: Convert between different file formats (CSV, TSV, PSV, JSON, XML)

Usage

Each task in FilePrepper follows a consistent pattern:

1. Configure the task options
2. Create a task instance
3. Execute the task with a context

Here's a basic example:

// Configure options
var options = new AddColumnsOption 
{
    NewColumns = new Dictionary<string, string>
    {
        { "NewColumn", "DefaultValue" }
    }
};

// Create task
var logger = LoggerFactory.Create(builder => builder.AddConsole())
                         .CreateLogger<AddColumnsTask>();
var task = new AddColumnsTask(logger);

// Execute
var context = new TaskContext(options)
{
    InputPath = "input.csv",
    OutputPath = "output.csv"
};
await task.ExecuteAsync(context);

Error Handling

FilePrepper provides flexible error handling through common options:

var options = new AddColumnsOption 
{
    Common = new CommonTaskOptions
    {
        ErrorHandling = new ErrorHandlingOptions
        {
            IgnoreErrors = true,
            DefaultValue = "0"
        }
    }
};

Installation

Add the FilePrepper package to your project:

dotnet add package FilePrepper