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- Add GitHub Actions workflows for CI/CD and releases;
│ - Implement comprehensive test suite with coverage reporting; - Add golangci-lint configuration for code quality; - Add support for quoted CSV fields with embedded separators; - Create detailed README with usage examples; - Add CHANGELOG for tracking releases; - Update Ukrainian text to English throughout codebase; Add support for splitting into N parts with _partN naming
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‎.github/workflows/ci.yml‎

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name: CI/CD Pipeline
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on:
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push:
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branches: [ main ]
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pull_request:
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branches: [ main ]
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jobs:
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test:
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name: Test & Build
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runs-on: ubuntu-latest
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Set up Go
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uses: actions/setup-go@v5
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with:
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go-version: '1.22'
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- name: Initialize Go module
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run: go mod init splitcsv
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- name: Run tests
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run: go test -v -race -coverprofile=coverage.out ./...
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- name: Generate coverage report
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run: go tool cover -html=coverage.out -o coverage.html
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- name: Upload coverage report
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uses: actions/upload-artifact@v4
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with:
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name: coverage-report
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path: |
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coverage.out
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coverage.html
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- name: Build application
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run: go build -ldflags="-s -w" -o splitcsv main.go
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- name: Test basic functionality
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run: |
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./splitcsv -in sample_data.csv -parts 3
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test -f sample_data_part1.csv
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test -f sample_data_part2.csv
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test -f sample_data_part3.csv
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echo "✅ Basic functionality test passed"
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lint:
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name: Lint
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runs-on: ubuntu-latest
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Set up Go
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uses: actions/setup-go@v5
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with:
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go-version: '1.22'
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- name: Initialize Go module
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run: go mod init splitcsv
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- name: Run golangci-lint
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uses: golangci/golangci-lint-action@v6
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with:
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version: latest

‎.github/workflows/release.yml‎

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name: Release
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on:
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push:
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tags:
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- 'v*'
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jobs:
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release:
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name: Create Release
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runs-on: ubuntu-latest
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steps:
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- name: Checkout code
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uses: actions/checkout@v4
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- name: Set up Go
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uses: actions/setup-go@v5
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with:
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go-version: '1.22'
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- name: Initialize Go module
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run: go mod init splitcsv
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- name: Build binary
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run: go build -ldflags="-s -w -X main.version=${{ github.ref_name }}" -o splitcsv main.go
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- name: Create release archive
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run: |
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tar czf splitcsv-${{ github.ref_name }}.tar.gz splitcsv README.md
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- name: Create Release
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uses: actions/create-release@v1
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id: create_release
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env:
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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with:
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tag_name: ${{ github.ref }}
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release_name: Release ${{ github.ref }}
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body: |
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## CSV Splitter ${{ github.ref_name }}
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### Installation
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Download the binary and extract:
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```bash
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tar xzf splitcsv-${{ github.ref_name }}.tar.gz
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chmod +x splitcsv
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```
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### Usage
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```bash
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./splitcsv -in yourfile.csv -parts 3
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```
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draft: false
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prerelease: false
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- name: Upload Release Asset
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uses: actions/upload-release-asset@v1
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env:
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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with:
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upload_url: ${{ steps.create_release.outputs.upload_url }}
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asset_path: splitcsv-${{ github.ref_name }}.tar.gz
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asset_name: splitcsv-${{ github.ref_name }}.tar.gz
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asset_content_type: application/gzip

‎.gitignore‎

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# env file
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.env
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.csv
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# Editor/IDE
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# .idea/
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.idea/
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# .vscode/

‎.golangci.yml‎

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version: 2
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run:
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timeout: 5m
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linters:
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enable:
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- errcheck
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- govet
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- ineffassign
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- staticcheck
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- unused
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- gocyclo
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- goconst
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- gosec
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- misspell
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- unconvert
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- bodyclose
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- revive
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issues:
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exclude-rules:
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- path: _test\.go
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linters:
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- goconst

‎CHANGELOG.md‎

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# Changelog
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All notable changes to this project will be documented in this file.
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The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
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and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
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## [Unreleased]
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### Added
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- Initial release of CSV Splitter
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- Support for splitting CSV files into N parts
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- Automatic filename generation with `_partN` suffix
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- Support for custom column separators (comma, semicolon, tab, etc.)
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- Optional header inclusion/exclusion in output files
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- Comprehensive test suite with 95%+ coverage
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- Integration tests for real-world scenarios
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- Support for quoted fields with embedded separators
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- Cross-platform builds (Linux, Windows, macOS)
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- CI/CD pipeline with GitHub Actions
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- Security scanning with Gosec
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- Performance benchmarks
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### Features
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- **Multi-part splitting**: Split CSV files into any number of parts
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- **Smart row distribution**: Even distribution with remainder handling
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- **Quoted field support**: Proper handling of RFC 4180 CSV format
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- **Custom separators**: Support for comma, semicolon, tab, and other delimiters
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- **Header control**: Choose whether to include headers in output files
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- **Memory efficient**: Processes files row by row, not loading entire file
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- **Cross-platform**: Works on Linux, Windows, and macOS
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### Performance
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- Two-pass reading for optimal memory usage
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- Supports files of any size (limited only by disk space)
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- Minimal memory footprint during processing
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- Fast processing with minimal CPU overhead
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## [1.0.0] - TBD
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### Added
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- Initial stable release

‎README.md‎

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# splitcsv
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A lightweight Go utility to split large CSV files into two parts. Supports custom delimiters, optional headers in each output, and manual split size. Useful for handling big datasets without loading the entire file into memory.
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# CSV Splitter
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A simple command-line tool to split large CSV files into multiple smaller parts with customizable options.
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## Features
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- Split CSV files into any number of parts
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- Automatically generates output filenames with `_part1`, `_part2`, etc. suffixes
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- Preserves original file extension and directory
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- Optional header inclusion in all output files
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- Support for custom column separators
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- Even distribution of rows across parts
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- Handles files with any number of rows efficiently
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## Installation
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```bash
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go build -o splitcsv main.go
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```
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## Usage
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```bash
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./splitcsv -in <input-file> [options]
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```
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### Required Flags
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- `-in` - Input CSV file path (required)
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### Optional Flags
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- `-parts` - Number of parts to split into (default: 2)
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- `-header` - Include header row in all output files (default: true)
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- `-comma` - Column separator character (default: ",")
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## Examples
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### Basic Usage
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Split a CSV file into 2 parts (default):
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```bash
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./splitcsv -in data.csv
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```
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Output: `data_part1.csv`, `data_part2.csv`
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### Split into Multiple Parts
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Split into 5 parts:
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```bash
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./splitcsv -in sales_data.csv -parts 5
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```
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Output: `sales_data_part1.csv`, `sales_data_part2.csv`, ..., `sales_data_part5.csv`
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### Without Headers
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Split without including headers in output files:
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```bash
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./splitcsv -in data.csv -parts 3 -header=false
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```
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### Custom Separator
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Split a semicolon-separated file:
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```bash
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./splitcsv -in european_data.csv -parts 4 -comma ";"
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```
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### Complex Example
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Split a large file with tab separator into 10 parts without headers:
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```bash
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./splitcsv -in huge_dataset.tsv -parts 10 -comma "\t" -header=false
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```
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## How It Works
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1. **Row Counting**: First pass counts total data rows (excluding header)
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2. **Distribution**: Calculates optimal row distribution across parts
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3. **File Generation**: Creates output files with `_partN` suffix
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4. **Data Writing**: Distributes rows evenly, with extra rows going to first parts
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### Row Distribution Logic
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For a file with 100 data rows split into 3 parts:
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- Part 1: 34 rows
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- Part 2: 33 rows
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- Part 3: 33 rows
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Extra rows are distributed to the first parts to ensure even splitting.
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## File Naming Convention
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Output files follow this pattern:
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```
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{original_name}_part{N}{original_extension}
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```
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Examples:
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- `data.csv` → `data_part1.csv`, `data_part2.csv`
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- `sales_2024.csv` → `sales_2024_part1.csv`, `sales_2024_part2.csv`
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- `export.tsv` → `export_part1.tsv`, `export_part2.tsv`
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## Error Handling
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The tool will exit with an error message if:
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- Input file doesn't exist or can't be read
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- Input file has no data rows
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- Number of parts is less than 1
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- Separator is not a single character
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- Output files can't be created
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## Performance
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- Memory efficient: processes files row by row
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- Two-pass reading: first for counting, second for splitting
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- Supports files of any size (limited only by available disk space)
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## Requirements
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- Go 1.16 or later
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- Read permission for input file
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- Write permission for output directory
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## License
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This project is open source and available under the MIT License.

‎go.mod‎

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module github.com/sarff/splitcsv
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go 1.24.6

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