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Transform the manifest parser from a parsing-only library into a full-featured project with a download engine, CLI tool, GoReleaser, and comprehensive documentation.
Changes
Download Engine (downloader/)
New sub-package so both CLI and library users can download game files. Includes a ProgressReporter interface with a no-op implementation for library users, a VerifyInstallation() function that checks file existence, size, and SHA1 hash
against a manifest, and a full download orchestrator with worker pool concurrency, chunk deduplication, retry with exponential backoff (capped at 30s), disk-based chunk cache for resume, SHA1 verification, atomic writes via temp files, context cancellation, tag-based file filtering, dry-run mode, and automatic cache cleanup after assembly. Covered by 16 tests across downloader and verifier.
CLI (cmd/manifest/)
Built with cobra and progressbar/v3, only imported from cmd/ so library users don't pull these dependencies. Commands: info for displaying metadata and sizes, list for file listing with tag/sort/filter/long flags, download with progress bar and flags for base URL, concurrency, retries, verify, resume, tags, and dry-run, verify for checking installed files against a manifest, delta for comparing two manifests with optional JSON output, chunks for listing chunk info, and export for JSON or CSV output.
GoReleaser + CI
Added .goreleaser.yaml for multi-platform static binaries (linux/darwin/windows, amd64/arm64) with ldflags for version injection. Added .github/workflows/release.yml triggered on version tags using goreleaser-action. Updated CI workflow to include a CLI build step.
Documentation
Added doc.go with package-level GoDoc. Complete rewrite of README.md with badges, feature list, CLI installation and usage for all commands, and low-level library examples covering parsing, metadata inspection, file and chunk iteration, chunk parts, custom fields, single chunk download and decompression, manual file assembly, the high-level downloader, delta patching, and verification. Includes CDN base URL performance table.