GitHub - redraw/rapel: chunked resumable downloads in unstable networks

Chunked HTTP downloader with resume support. A modern, cross-platform implementation with improved state management and progress tracking. Installation go build -o bin/rapel Or install directly: go install github.com/redraw/rapel@latest Usage Download a file with default settings (100MB chunks, 1 concurrent job): rapel download https://example.com/file.bin Download with custom chunk size and multiple concurrent downloads: rapel download https://example.com/file.bin -c 50M --jobs 4 Download through a proxy: rapel download https://example.com/file.bin -x socks5h://127.0.0.1:9050 Download and auto-merge: rapel download https://example.com/file.bin --merge Run command after each chunk completes: rapel download https://example.com/file.bin --post-part 'rclone move {part} remote:bucket/' Merge chunk files manually: rapel merge # Auto-detects output name rapel merge --pattern 'file.*.part' # Auto-detects as "file" rapel merge -o output.bin --delete # Explicit name, delete after merge Features

JSON state management: Single .rapel-state.json file tracks all chunk metadata Graceful shutdown: Ctrl+C saves progress and allows resume Better progress display: Real-time speed, completion status with ANSI formatting Cross-platform: Works on Linux (amd64, arm64, arm v6/v7), macOS (Intel/Apple Silicon), Windows, and FreeBSD Raspberry Pi support: Native ARM v7 and v6 binaries for all Raspberry Pi models Resume support: Automatically resumes interrupted downloads Concurrent downloads: Download multiple chunks simultaneously Post-part hooks: Run custom commands after each chunk completes (e.g., upload to cloud) Smart merging: Auto-detects output filename and handles multiple download sessions

Options Download command: -c SIZE Chunk size (K, M, G suffix). Default: 100M -x URL Proxy URL (e.g., socks5h://127.0.0.1:9050) -r N Retries per request.

Default: 10 --no-head Skip HEAD request (requires --size) --size BYTES Total size in bytes (required if --no-head) --jobs N Concurrent chunks. Default: 1 --force Force re-download even if state exists --merge Merge chunks after download (auto-detects output name) --post-part CMD Command to run after each part completes Placeholders: {part} {idx} {base}

Merge command: -o FILE Output filename (auto-detected if not provided) --pattern GLOB Pattern for chunk files. Default: *.part --delete Delete chunk files after merging