# Trace: Creating a Go Version of a Ruby Changelog Agent: claude-code | Model: Claude Opus 4.6 | Project: git-pkgs --- ## User see https://nesbitt.io/2025/12/14/supply-chain-security-tools-for-ruby.html do we have equiveltn in go for each one of these? I know I've written some in git-pkgs but maybe there are existing well maintained go tools for others? ## Assistant ## Assistant ### Tool: WebFetch **Args:** ```json { "prompt": "List all the supply chain security tools for Ruby mentioned in this blog post. For each tool, give its name, what it does, and its URL/repo if mentioned.", "url": "https://nesbitt.io/2025/12/14/supply-chain-security-tools-for-ruby.html" } ``` ## Assistant ### Tool: Task **Args:** ```json { "description": "Explore git-pkgs codebase", "prompt": "Thoroughly explore the /Users/andrew/code/git-pkgs codebase. I need to understand what tools/commands exist here and what each one does. Look at the project structure, any README, main entry points, cmd/ directories, and key Go files. Give me a summary of every tool/command this project provides and what supply-chain-security or package-management functionality each one offers.", "subagent_type": "Explore" } ``` ## Assistant **Result** (success): ``` # Supply Chain Security Tools for Ruby 1. **purl** (https://github.com/andrew/purl) Parses and generates Package URL identifiers, "a standardized format for identifying software packages across ecosystems." 2. **vers** (https://github.com/andrew/vers) Implements the version range specification that accompanies PURL, normalizing different ecosystem syntaxes into unified ranges. 3. **sbom** (https://github.com/andrew/sbom) Parses, generates, and validates Software Bill of Materials in SPDX and CycloneDX formats across multiple file types. 4. **swhid** (https://github.com/andrew/swhid) Works with Software Hash IDentifiers, "content-based hashes for software artifacts: files, directories, commits, releases, and snapshots." 5. **changelog-parser** (https://github.com/andrew/changelog-parser) Extracts structured release notes from changelogs that follow various formats and conventions. 6. **diffoscope** (https://github.com/andrew/diffoscope) Provides Ruby bindings for comparing files and archives to identify what changed between package versions. 7. **sarif** (https://github.com/andrew/sarif) Provides Ruby classes implementing "the OASIS standard for representing" static analysis tool findings. ``` ## Assistant **Result** (success): ``` Perfect! Now I have all the information I need. Let me compile a comprehensive summary of all tools and commands. ## Summary of git-pkgs Project Structure and Tools This is a comprehensive Go monorepo for supply-chain security and package management tooling across 35+ package ecosystems. Here's a complete breakdown: ### Main CLI Tool: git-pkgs **Location:** `/Users/andrew/code/git-pkgs/git-pkgs/` A git subcommand for tracking package dependencies across git history with database-backed queries. All commands are defined in the `cmd/` directory with 50+ subcommands organized into these categories: #### Core Dependency Tracking Commands - **init** - Initialize SQLite database in `.git/pkgs.sqlite3` by indexing all dependency changes from git history - **list** / **ls** - List dependencies at a specific commit (defaults to HEAD) - **history** - Show all dependency changes over time, can filter by package, author, date - **blame** - Show who added each current dependency with commit info - **stats** - Display dependency statistics by author, ecosystem, manifest type - **stale** - Find dependencies untouched for specified duration - **show** - Show dependency changes in a specific commit - **log** - List only commits with dependency changes - **why** - Explain why a dependency was added with commit message context - **where** / **find** - Locate where a package is declared in manifest files - **search** / **grep** - Search dependencies matching a pattern - **tree** - Display dependencies grouped by type (runtime, development, etc) #### Supply Chain Security Commands - **vulns** / **audit** - Vulnerability scanning via OSV database - **vulns scan** - Scan current/historical dependencies for CVEs - **vulns blame** - Who introduced each vulnerability - **vulns praise** - Who fixed vulnerabilities - **vulns diff** - Compare vulnerability state between commits/branches - **vulns log** - Show commits introducing/fixing vulnerabilities - **vulns history** - Vulnerability timeline for a package - **vulns show** - Details about specific CVE - **vulns exposure** - Remediation metrics for CRA compliance - **vulns sync** - Cache vulnerability data from OSV locally - **licenses** - License compliance checking and reporting - Normalizes to SPDX identifiers - Flag copyleft/non-permissive licenses - Support allow/deny lists with exit codes for CI - Output: text, JSON, CSV, grouped by license - **integrity** - Lockfile SHA256 integrity hash verification - Detect "drift" where same version has different hashes across manifests - Optional registry verification for supply chain tampering detection - **sbom** - Software Bill of Materials export - CycloneDX (default) and SPDX formats - JSON or XML output - Optional license enrichment from registries #### Dependency Management Commands - **install** - Install from lockfile, with `--frozen` for CI mode - **add** - Add a package (with optional `--dev` flag and specific version) - **remove** / **rm** - Remove a package - **update** - Update dependencies (specific package or all) - **resolve** - Print normalized dependency graph as JSON with PURLs - **browse** - Open installed package source in editor (supports `--path`, `--open`) - **vendor** - Vendor dependencies into the project #### Registry & Version Queries - **outdated** - Find packages with newer versions available - Filter by major/minor/patch updates - Time-travel flag: `--at DATE` or git ref to see what was outdated at that time - Queries ecosyste.ms API or registries directly #### Database & Maintenance Commands - **info** - Show database size and row counts - **reindex** - Update database with new commits - **upgrade** - Rebuild database if schema changed - **hooks** - Manage git hooks for automatic updates - `hooks --install`, `--uninstall` - **branch** - Manage tracked branches - **branch track** - Track a new branch - **branch stop** - Stop tracking a branch - **branch list** - List tracked branches - **ecosystems** - List supported ecosystems with enable/disable status #### Diff & Analysis Commands - **diff** - Compare dependencies between commits, branches, or working tree - `--from`, `--to` flags for specific commits - Supports branch syntax like `main..feature` - Filter by ecosystem, manifest, dependency type - **diff-file** - Compare two manifest files directly (no git required) - Useful for comparing across projects or archives #### Query & Search Commands - **notes** - Package annotation system - `notes add`, `notes append`, `notes list`, `notes show`, `notes remove`, `notes namespaces` #### Bisect Commands - **bisect** - Binary search through git history for dependency changes - `bisect start`, `bisect good`, `bisect bad`, `bisect reset`, `bisect log`, `bisect run` - Narrow by ecosystem, package, or manifest file - Can automate with scripts (e.g., find when GPL license introduced) #### Output & Configuration Commands - **schema** - Display database schema in multiple formats (sql, json, markdown) - **completions** - Shell completion generation - Bash, Zsh, or auto-install to standard directories - **diff-driver** - Git textconv driver to show semantic diffs instead of raw lockfile diffs - **plugins** - Support for external `git-pkgs-*` executables on PATH --- ### Library Modules (Supporting Packages) **Location:** `/Users/andrew/code/git-pkgs/[module]/` #### 1. **purl** - Package URL handling - Parse/create Package URLs (PURLs) per RFC spec - Registry URL generation and parsing - Type configuration with default registries - Version constraint cleaning #### 2. **vers** - Version range parsing and comparison - VERS URI format (universal version ranges) - Native syntax for each ecosystem (npm carets/tildes, gem pessimistic, maven brackets, etc) - Version satisfaction checking - Comparison and sorting #### 3. **vulns** - Vulnerability data fetching - Multiple sources: OSV (free/no auth), deps.dev, GitHub Security Advisories, NVD, Grype DB, VulnCheck, Vulnerability-Lookup - Unified interface returning OSV format - CVSS parsing (v2.0, v3.0, v3.1, v4.0) - Batch query support - Version matching to check if specific version affected #### 4. **registries** - Package registry API client - Unified interface for 25 ecosystems - Fetch: package metadata, versions, dependencies, maintainers, latest versions - Direct registry queries or via ecosyste.ms aggregator - Support for private registries via `repository_url` qualifiers in PURLs - Bulk operations with parallel fetching - Error handling with NotFoundError #### 5. **enrichment** - Package metadata enrichment - Hybrid strategy: query ecosyste.ms or registries directly based on configuration - Bulk lookups with license, version, description, repository info - Environment variable/git config control for direct vs indirect queries #### 6. **platforms** - Platform identifier translation - Translate across 15+ package manager platform formats (Go/Rust/Node/RubyGems/Python/Debian/etc) - Canonical arch/OS mapping - Pre-computed mappings for complex cases #### 7. **managers** - Package manager CLI wrapper - Unified interface for 35+ package managers - Operations: install, add, remove, list, outdated, update, vendor, resolve, path - Translate to correct CLI commands per manager - Detect from lockfiles #### 8. **resolve** - Dependency graph parser - Parse raw manager CLI output (`npm ls --json`, `go mod graph`, etc) - Return structured dependency tree with PURLs - Supports 25 managers with various output formats (JSON trees, text trees, flat lists) #### 9. **manifests** - Manifest file parsing - Parse 60+ package manager manifest and lockfiles - Extract dependencies with version constraints, scopes, integrity hashes - Supports Cargo, npm, RubyGems, Python, Go, Maven, NuGet, PHP, Dockerfile, Docker Compose, GitHub Actions, Alpine, Arch, Bazel, and many more #### 10. **archives** - Archive file reading - Read ZIP, TAR (gzip/bzip2/xz), and Ruby gem formats in-memory - List files, extract specific files, directory browsing - Prefix stripping for wrapped content #### 11. **forges** - Git forge API client - Normalized repository metadata from GitHub, GitLab, Gitea/Forgejo, Bitbucket Cloud - Fetch repositories, tags, commits by URL or PURL - Self-hosted forge support with auto-detection #### 12. **spdx** - SPDX license handling - Normalize informal license strings ("Apache 2" → "Apache-2.0") - Parse license expressions with operator precedence - Validate licenses - License compatibility checking - License categorization (permissive, copyleft, weak copyleft, public domain, etc) - Performance: ~5µs per license #### 13. **gitignore** - Gitignore pattern matching - Wildmatch implementation (same algorithm as git) - Bracket expressions with POSIX character classes - Proper `**` handling - Nested `.gitignore` discovery - Match provenance tracking --- ### Standalone CLI Tools #### 1. **git-orgs** **Location:** `/Users/andrew/code/git-pkgs/orgs/cmd/` Aggregate dependency data across an organization's repositories. Commands: - **init** - Initialize org sync database - **list** - List repositories in org - **search** - Search repositories - **stats** - Show aggregated dependency stats - **sync** - Fetch repos from forge API Supports GitHub, GitLab, Gitea, Bitbucket with authentication tokens. #### 2. **git-pkgs proxy** **Location:** `/Users/andrew/code/git-pkgs/proxy/` Caching proxy for package registries (speeds up downloads, improves reliability). Supported registries: - npm, Cargo, RubyGems, Go proxy, Hex, pub.dev, PyPI, Maven, NuGet, Composer, Conan, Conda, CRAN, Container (OCI), Debian, RPM Commands: - **serve** (default) - Run proxy server - **stats** - Show cache statistics API endpoints for package metadata, vulnerability scanning, outdated detection, bulk lookups. --- ### Data & Testing Modules #### 1. **testing** - Repositories for testing (React, Rails, Next.js, VSCode, etc) - Test data fixtures #### 2. **demo** - Demo notebooks and examples #### 3. **homebrew-git-pkgs** - Homebrew tap for installation --- ### Summary by Supply-Chain Security Focus **Dependency Tracking:** git-pkgs CLI tracks all changes to dependencies across git history with full blame/history analysis. **Vulnerability Management:** vulns library + git-pkgs vulns commands provide OSV-backed CVE scanning with historical context (who introduced, when fixed, exposure time). **License Compliance:** licenses command with SPDX normalization, categorization, copyleft detection, and CI-friendly allow/deny lists. **Integrity Verification:** integrity command detects SHA256 drift and supply chain tampering. **SBOM Generation:** Export dependencies in CycloneDX or SPDX formats for compliance. **Package Registry Access:** registries library and enrichment service query 25+ package managers for metadata, versions, licenses. **Organization-Wide Visibility:** git-orgs tool aggregates dependency data across repositories. **Package Distribution:** proxy service caches artifacts from 16+ registries to reduce bandwidth and improve reliability. agentId: a093353 (for resuming to continue this agent's work if needed) total_tokens: 77178 tool_uses: 45 duration_ms: 168023 ``` ## Assistant ## Assistant Let me check if there are any swhid, sarif, or changelog modules in the codebase that the exploration might have missed. ## Assistant ### Tool: Glob **Args:** ```json { "path": "/Users/andrew/code/git-pkgs", "pattern": "**/swhid*" } ``` ## Assistant ### Tool: Glob **Args:** ```json { "path": "/Users/andrew/code/git-pkgs", "pattern": "**/sarif*" } ``` ## Assistant ### Tool: Glob **Args:** ```json { "path": "/Users/andrew/code/git-pkgs", "pattern": "**/changelog*" } ``` ## Assistant ### Tool: Glob **Args:** ```json { "path": "/Users/andrew/code/git-pkgs", "pattern": "**/diffoscope*" } ``` ## Assistant **Result** (success): ``` No files found ``` ## Assistant **Result** (success): ``` No files found ``` ## Assistant **Result** (success): ``` /Users/andrew/code/git-pkgs/testing/repos/rails/tools/rail_inspector/lib/rail_inspector/changelog.rb /Users/andrew/code/git-pkgs/testing/repos/rails/tools/rail_inspector/test/rail_inspector/changelog_test.rb /Users/andrew/code/git-pkgs/testing/repos/rails/tools/rail_inspector/test/test_helpers/changelog_fixtures.rb /Users/andrew/code/git-pkgs/testing/repos/react/node_modules/file-entry-cache/changelog.md /Users/andrew/code/git-pkgs/testing/repos/react/node_modules/flat-cache/changelog.md /Users/andrew/code/git-pkgs/testing/repos/react/node_modules/deepmerge/changelog.md /Users/andrew/code/git-pkgs/testing/repos/react/node_modules/eslint-v9/node_modules/flat-cache/changelog.md /Users/andrew/code/git-pkgs/testing/repos/react/node_modules/chrome-launcher/changelog.md /Users/andrew/code/git-pkgs/testing/repos/react/node_modules/bluebird/changelog.md ``` ## Assistant **Result** (success): ``` No files found ``` ## Assistant ## Assistant Now let me search for existing Go implementations of the tools you don't already have. ## Assistant ### Tool: Task **Args:** ```json { "description": "Search Go SWHID libraries", "prompt": "Search the web for Go/golang libraries or tools that implement Software Hash IDentifiers (SWHID) - the content-based hashing scheme used by Software Heritage. I'm looking for well-maintained Go packages that can compute or parse SWHIDs for files, directories, commits, releases, and snapshots. Search for things like \"golang swhid\", \"go software heritage identifier\", \"swhid go library\". Return what you find including repo URLs, star counts if visible, and maintenance status.", "subagent_type": "general-purpose" } ``` ## Assistant ### Tool: Task **Args:** ```json { "description": "Search Go SARIF libraries", "prompt": "Search the web for Go/golang libraries that implement SARIF (Static Analysis Results Interchange Format) - the OASIS standard for representing static analysis findings. I'm looking for well-maintained Go packages that can parse, generate, or validate SARIF files. Search for \"golang sarif\", \"go sarif library\", \"sarif go package\". Return what you find including repo URLs, star counts if visible, and maintenance status.", "subagent_type": "general-purpose" } ``` ## Assistant ### Tool: Task **Args:** ```json { "description": "Search Go changelog parsers", "prompt": "Search the web for Go/golang libraries or tools that parse changelogs (CHANGELOG.md files) into structured data - extracting version numbers, dates, and release notes. Search for \"golang changelog parser\", \"go changelog parse library\", \"go parse changelog\". Return what you find including repo URLs, star counts if visible, and maintenance status.", "subagent_type": "general-purpose" } ``` ## Assistant ### Tool: Task **Args:** ```json { "description": "Search Go diffoscope equivalent", "prompt": "Search the web for Go/golang equivalents of diffoscope - tools that can deeply compare files, archives, and packages to show exactly what changed between versions. Not just text diff but structural/binary comparison of archives (zip, tar, etc). Search for \"golang diffoscope\", \"go archive diff\", \"go package diff tool\", \"go binary diff comparison\". Return what you find including repo URLs, star counts if visible, and maintenance status.", "subagent_type": "general-purpose" } ``` ## Assistant **Result** (success): ``` Here's what I found across the Go ecosystem for SARIF libraries. --- **owenrumney/go-sarif** is the clear front-runner. 80 stars, 14 contributors, latest release v3.3.0 from October 2025. It supports both SARIF v2.1.0 and v2.2 specifications. The API covers the full lifecycle: parsing (`sarif.Open`, `sarif.FromBytes`, `sarif.FromString`), generating reports from scratch, and validating against the schema via `report.Validate()`. Install with `go get github.com/owenrumney/go-sarif/v3`. This is the most widely used standalone SARIF library in Go and is packaged in both Fedora and Debian. It includes a minor deviation from the spec to accommodate GitHub's requirement that `run.Results` be present for code scanning upload. - Repo: https://github.com/owenrumney/go-sarif - License: Apache-2.0 - Stars: ~80 - Last release: v3.3.0 (October 2025) - Status: Actively maintained **projectdiscovery/sarif** is a simpler SARIF exporter from the ProjectDiscovery team (the folks behind nuclei, httpx, etc.). 13 stars, MIT license. It's more of a lightweight writer than a full-featured library. Only 3 commits total, all from late 2022, with a single v0.0.1 release. It works but hasn't seen updates in over three years. - Repo: https://github.com/projectdiscovery/sarif - License: MIT - Stars: ~13 - Last release: v0.0.1 (November 2022) - Status: Inactive/minimal **chavacava/garif** takes a different design approach, with constructor functions (`New...`) and decorator methods (`With...`) for building SARIF v2.1.0 output. It was created for the `revive` linter's SARIF formatter. The GitHub repo (6 stars) was archived in April 2025 and development moved to Codeberg. The Codeberg version had a commit in April 2025 updating to Go 1.23, so the maintainer is still around, but activity is sparse. - Repo (archived): https://github.com/chavacava/garif - Repo (current): https://codeberg.org/chavacava/garif - License: MIT - Stars: 6 (GitHub) / 1 (Codeberg) - Status: Low activity, moved to Codeberg **haya14busa/go-sarif** provides auto-generated Go structs from the SARIF v2.1.0 JSON schema using quicktype. It's purely data types with no logic for reading/writing/validating. 1 star, 13 commits, MIT license. Useful if you just want the type definitions and plan to handle marshaling yourself. - Repo: https://github.com/haya14busa/go-sarif - License: MIT - Stars: 1 - Status: Minimal **golang.org/x/vuln/internal/sarif** is the Go team's own SARIF implementation used internally by `govulncheck`. The `internal` path means it's not importable by external code, so you can't use it as a library. It exists only to serve govulncheck's SARIF output. **github.com/securego/gosec/v2/report/sarif** is similarly an internal package within the gosec security scanner. It generates SARIF output for gosec's findings but isn't designed as a standalone library. **github.com/ocurity/dracon/pkg/sarif** converts Dracon's `LaunchToolResponse` format into SARIF documents. Specific to the Dracon security orchestration platform. If I had to pick one: **owenrumney/go-sarif** is the only general-purpose Go SARIF library that's well-maintained, feature-complete (parse + generate + validate), supports multiple SARIF spec versions, and has meaningful adoption. Everything else is either abandoned, internal to another tool, or too minimal. Sources: - [owenrumney/go-sarif](https://github.com/owenrumney/go-sarif) - [projectdiscovery/sarif](https://github.com/projectdiscovery/sarif) - [chavacava/garif (GitHub, archived)](https://github.com/chavacava/garif) - [chavacava/garif (Codeberg)](https://codeberg.org/chavacava/garif) - [haya14busa/go-sarif](https://github.com/haya14busa/go-sarif) - [golang.org/x/vuln/internal/sarif on pkg.go.dev](https://pkg.go.dev/golang.org/x/vuln/internal/sarif) - [gosec/v2/report/sarif on pkg.go.dev](https://pkg.go.dev/github.com/securego/gosec/v2/report/sarif) - [ocurity/dracon/pkg/sarif on pkg.go.dev](https://pkg.go.dev/github.com/ocurity/dracon/pkg/sarif) agentId: abf0028 (for resuming to continue this agent's work if needed) total_tokens: 22606 tool_uses: 14 duration_ms: 81584 ``` ## Assistant **Result** (success): ``` Here's what I found across the Go ecosystem for CHANGELOG.md parsing. --- **anton-yurchenko/go-changelog** -- https://github.com/anton-yurchenko/go-changelog The most full-featured parser of the bunch. 3 stars (very low), but the API is well thought out. Latest release v1.1.0 from July 2023, last commit January 2025. MIT license. It parses Keep a Changelog and Common Changelog formats into structured Go types: ```go type Changelog struct { Title *string Description *string Unreleased *Release Releases Releases } type Release struct { Version *string Date *time.Time Yanked bool URL *string Changes *Changes } type Changes struct { Added *[]string Changed *[]string Deprecated *[]string Fixed *[]string Removed *[]string Security *[]string Notice *string } ``` Usage is straightforward: ```go p, _ := changelog.NewParser("./CHANGELOG.md") c, _ := p.Parse() r := c.GetRelease("1.2.1") ``` It also supports creating and updating changelogs, not just reading them. Uses `afero` for filesystem abstraction. This is the only library that gives you typed `time.Time` dates and scoped changes (Added/Changed/Fixed etc.) out of the box. --- **parkr/changelog** (byparker.com/go/changelog) -- https://github.com/parkr/changelog 33 stars. Latest release v1.5.0 from November 2023. MIT license. Published on pkg.go.dev as `byparker.com/go/changelog`. Parses markdown changelogs into `Version`, `Subsection`, and `ChangeLine` structs, with support for extracting PR number references and @mentions. ```go changes, _ := changelog.NewChangelogFromFile("CHANGELOG.md") // or changes, _ := changelog.NewChangelogFromReader(reader) ``` Expects a format like: ```markdown ## 1.0.0 / 2015-02-21 ### Major Enhancements * Added that big feature (#1425) ### Bug Fixes * Fixed that nasty bug (@carla) ``` The `ChangeLine` type pulls out the summary text and any reference (PR number or username). This one feels geared toward Jekyll-style changelogs specifically. Originally published in 2016, but got a release as recently as late 2023, so someone is still minding it. --- **rcmachado/changelog** -- https://github.com/rcmachado/changelog 48 stars. Last release v0.7.0 from July 2020. MIT license. Primarily a CLI tool for reading, validating, and manipulating keepachangelog.com-format files, but it exposes a `parser` package you can use as a library: ```go file, _ := os.Open("CHANGELOG.md") changelog := parser.Parse(file) ``` Returns a `chg.Changelog` struct. The CLI commands (`fmt`, `release`, `show`) are useful too. It hasn't had a release in nearly six years though, and still sits at v0.x. 16 open issues, 2 open PRs. Functional but not actively developed. --- **hashicorp/go-changelog** -- https://github.com/hashicorp/go-changelog 122 stars (the highest count in this group). MIT license. But it does something different from what you're asking for. Rather than parsing an existing CHANGELOG.md, it generates changelogs from individual files stored in a `.changelog/` directory. Each PR gets its own `.changelog/1234.txt` file, and the tool compiles them together between git refs. Not useful for parsing an existing markdown changelog. --- **chelnak/gh-changelog** -- https://github.com/chelnak/gh-changelog 126 stars. Latest release v0.15.3 from May 2024. This is a GitHub CLI extension that generates changelogs from pull requests and tags. It has an internal `parser` package, but the tool is focused on generation, not on parsing existing files into structured data. Not what you're after. --- **masutaka/changelog-parser** -- https://github.com/masutaka/changelog-parser 2 stars. Archived September 2021. A single commit from 2015, marked [WIP]. Dead on arrival. --- **goreleaser/chglog** -- https://pkg.go.dev/github.com/goreleaser/chglog Part of the GoReleaser ecosystem. A changelog management library, but oriented toward changelog generation rather than parsing existing markdown files. --- **Summary of what's actually useful for parsing CHANGELOG.md into structured data:** | Library | Stars | Last Activity | Parses Existing Files | Typed Date | Scoped Changes | |---|---|---|---|---|---| | anton-yurchenko/go-changelog | 3 | Jan 2025 | Yes | `time.Time` | Yes (Added/Changed/Fixed...) | | parkr/changelog | 33 | Nov 2023 | Yes | String in version header | Via subsections | | rcmachado/changelog | 48 | Jul 2020 | Yes | Part of parsed struct | Yes | The `anton-yurchenko/go-changelog` library is the most capable for your use case despite the low star count. It gives you proper `time.Time` dates, scoped change categories matching the Keep a Changelog spec, and round-trip support (parse, modify, write back). The `parkr/changelog` library is simpler and has more community validation. The `rcmachado/changelog` one works but looks dormant. The ecosystem here is pretty thin overall. None of these are widely adopted. If the parsing needs are simple enough (grab version headers, dates, and body text), writing a small purpose-built parser against a known changelog format might end up being less friction than taking a dependency on a 3-star library. Sources: - [anton-yurchenko/go-changelog](https://github.com/anton-yurchenko/go-changelog) - [anton-yurchenko/go-changelog on pkg.go.dev](https://pkg.go.dev/github.com/anton-yurchenko/go-changelog) - [parkr/changelog](https://github.com/parkr/changelog) - [parkr/changelog on pkg.go.dev](https://pkg.go.dev/byparker.com/go/changelog) - [rcmachado/changelog](https://github.com/rcmachado/changelog) - [rcmachado/changelog parser on pkg.go.dev](https://pkg.go.dev/github.com/rcmachado/changelog/parser) - [hashicorp/go-changelog](https://github.com/hashicorp/go-changelog) - [chelnak/gh-changelog](https://github.com/chelnak/gh-changelog) - [masutaka/changelog-parser](https://github.com/masutaka/changelog-parser) - [goreleaser/chglog on pkg.go.dev](https://pkg.go.dev/github.com/goreleaser/chglog) agentId: ad02e7c (for resuming to continue this agent's work if needed) total_tokens: 22780 tool_uses: 14 duration_ms: 87227 ``` ## Assistant **Result** (success): ``` Here is what I found across the Go ecosystem for SWHID libraries. ## Go SWHID Libraries There are exactly **two** Go libraries for computing and parsing SWHIDs. Neither is an official Software Heritage project (the official implementations are in Python, Rust, and OCaml). No Go implementation exists under the `swhid` GitHub org or the Software Heritage org. ### 1. andrew/swhid-go - **Repo:** https://github.com/andrew/swhid-go - **pkg.go.dev:** https://pkg.go.dev/github.com/andrew/swhid-go - **Stars:** 1 - **License:** MIT - **Last updated:** February 10, 2026 - **Version:** v0.0.0 (no tagged release yet) This is the more fully-featured of the two. It provides both a library and a CLI tool. It supports all five SWHID object types: | Type | Code | What it identifies | |------|------|--------------------| | Content | `cnt` | File content (blob) | | Directory | `dir` | Directory tree | | Revision | `rev` | Git commit | | Release | `rel` | Annotated tag | | Snapshot | `snp` | Repository state | Key library functions include `FromContent`, `FromDirectoryPath`, `FromRevision`, `FromRelease`, `FromSnapshot`, and `Parse`. The CLI supports `parse`, `content`, `directory`, `revision`, `release`, and `snapshot` subcommands with JSON output and qualifier support. Example usage from the docs: ```go id := swhid.FromContent([]byte("hello\n")) // swh:1:cnt:ce013625030ba8dba906f756967f9e9ca394464a parsed, _ := swhid.Parse("swh:1:cnt:ce013625030ba8dba906f756967f9e9ca394464a") fsID, _ := swhid.FromDirectoryPath("/path/to/dir") revID, _ := swhid.FromRevision("/path/to/repo", "HEAD") ``` ### 2. afbjorklund/go-swhid - **Repo:** https://github.com/afbjorklund/go-swhid - **Stars:** 0 - **License:** Apache-2.0 - **Last updated:** January 19, 2026 - **Commits:** 7 This one also aims to generate and parse SWHIDs and references the SWHID v1.2 specification (ISO/IEC 18670:2025). It has a `cmd/swhid/` CLI and `pkg/swhid/` library layout. There is less public documentation on pkg.go.dev (it returned a 404 when I checked), and the README has fewer details about API surface. It is very new with only 7 commits and no stars. ## For context: implementations in other languages The broader SWHID ecosystem has more mature options in other languages: - **Rust** (`swhid/swhid-rs`) -- 7 stars, the official reference implementation under the SWHID working group, updated Feb 15, 2026 - **Python** (`swh-model`) -- the original Software Heritage implementation, mature and widely used - **OCaml** (`OCamlPro/swhid`) -- 3 stars, parser/printer plus computation for all object types - **Ruby** (`andrew/swhid`) -- 11 stars, generate and parse SWHIDs There is also an official [test suite](https://github.com/swhid/test-suite) (5 stars) under the SWHID GitHub org for validating implementations against the spec. ## Summary If you need a Go SWHID library today, `andrew/swhid-go` is the more complete option with documented API, CLI tooling, and support for all five object types. Both Go packages are very young (pre-v1, low star counts), so you should expect rough edges. The SWHID working group's [test suite](https://github.com/swhid/test-suite) would be worth running against either implementation to verify correctness. Sources: - [SWHID GitHub topic page](https://github.com/topics/swhid) - [SWHID GitHub organization](https://github.com/swhid) - [andrew/swhid-go on pkg.go.dev](https://pkg.go.dev/github.com/andrew/swhid-go/cmd/swhid) - [andrew/swhid-go on GitHub](https://github.com/andrew/swhid-go) - [afbjorklund/go-swhid on GitHub](https://github.com/afbjorklund/go-swhid) - [SWHID specification](https://www.swhid.org/) - [Software Heritage](https://www.softwareheritage.org/software-hash-identifier-swhid/) - [Software Heritage SWHID documentation](https://docs.softwareheritage.org/devel/swh-model/persistent-identifiers.html) agentId: a9f55f1 (for resuming to continue this agent's work if needed) total_tokens: 24792 tool_uses: 18 duration_ms: 95972 ``` ## Assistant **Result** (success): ``` Here is what I found. The short answer is that there is no direct Go equivalent of diffoscope -- nothing in Go that recursively unpacks archives in all their formats and produces a structural diff the way diffoscope does. What exists falls into a few narrower categories. --- **Closest to diffoscope in spirit (container-scoped):** - [**diffoci**](https://github.com/reproducible-containers/diffoci) -- 551 stars, written in Go, actively maintained (last push Feb 2026). Diffs Docker and OCI container images. It can recursively compare image layers, file contents, and metadata. Has a `--semantic` flag to ignore timestamps and other noise. Built by the reproducible-containers project. This is the closest thing to diffoscope in Go, but scoped to container images rather than arbitrary archives. - [**container-diff**](https://github.com/GoogleContainerTools/container-diff) -- 3,801 stars, written in Go, but **archived in March 2024** and no longer maintained. Was Google's tool for analyzing and comparing container images (file system, packages, pip, npm, etc.). Dead project at this point. **Archive/artifact comparison:** - [**artifact-diff**](https://github.com/gesellix/artifact-diff) -- 0 stars, written in Go, actively maintained (last push Feb 2026). Compares directories and zip/jar artifacts, producing reports in plain text, JSON, or YAML. Very small project, basically one person's tool, but it does the thing of cracking open archives and comparing contents. **Binary diff/patch (not structural, but binary-level):** - [**xferspdy**](https://github.com/monmohan/xferspdy) -- 101 stars, Go, last push April 2021 (dormant). Provides binary diff and patch using rolling hash and block matching. Listed in Awesome Go. This is rsync-style binary diffing, not structural comparison of archive contents. **Text/structure diffing libraries (not archive-aware):** - [**sergi/go-diff**](https://github.com/sergi/go-diff) -- 2,046 stars, Go, maintained. Port of Google's diff-match-patch. Text diffing only. - [**r3labs/diff**](https://github.com/r3labs/diff) -- 986 stars, Go, maintained. Diffs Go structs using reflection. Useful for comparing deserialized data, not files/archives directly. - [**kilianpaquier/compare**](https://github.com/kilianpaquier/compare) -- 4 stars, Go, actively maintained (push today). Compares files and directories using Go's internal diff library. No archive unpacking. - [**qri-io/deepdiff**](https://github.com/qri-io/deepdiff) -- 19 stars, Go, last push May 2021 (dormant). Structured data differ for JSON/CBOR/CSV. Not archive-aware. - [**spcau/godiff**](https://github.com/spcau/godiff) -- 49 stars, HTML output. Last push 2015, effectively abandoned. --- The gap is clear: nobody has written a Go tool that does what diffoscope does across arbitrary archive formats (zip, tar, tar.gz, deb, rpm, ISO, etc.) with recursive unpacking and format-aware rendering. diffoci comes closest but only for container images. artifact-diff handles zip/jar but is tiny and limited. If you wanted to build this in Go, you would likely combine [mholt/archiver](https://pkg.go.dev/github.com/mholt/archiver/v4) (which handles many archive formats) with a text diffing library like sergi/go-diff, plus format-specific decoders for things like ELF binaries, PDF, etc. That is roughly what diffoscope does in Python with libarchive and a long list of format handlers. Sources: - [diffoci](https://github.com/reproducible-containers/diffoci) - [container-diff](https://github.com/GoogleContainerTools/container-diff) - [artifact-diff](https://github.com/gesellix/artifact-diff) - [xferspdy](https://github.com/monmohan/xferspdy) - [go-diff](https://github.com/sergi/go-diff) - [r3labs/diff](https://github.com/r3labs/diff) - [kilianpaquier/compare](https://github.com/kilianpaquier/compare) - [qri-io/deepdiff](https://github.com/qri-io/deepdiff) - [mholt/archiver](https://pkg.go.dev/github.com/mholt/archiver/v4) - [diffoscope](https://diffoscope.org/) agentId: acc1953 (for resuming to continue this agent's work if needed) total_tokens: 25360 tool_uses: 23 duration_ms: 97437 ``` ## Assistant ## Assistant Here's the breakdown. The blog post lists seven Ruby gems, all of which you wrote: | Ruby gem | What it does | Go equivalent | |---|---|---| | **purl** | Parse/generate Package URLs | **You already wrote this** in git-pkgs | | **vers** | Version range spec (VERS format) | **You already wrote this** in git-pkgs | | **sbom** | Parse/generate SPDX & CycloneDX | **You already wrote this** in git-pkgs (generation at least) | | **swhid** | Software Hash IDentifiers | **You already wrote this** -- `andrew/swhid-go` on GitHub | | **changelog-parser** | Structured release notes from changelogs | Nothing good exists | | **diffoscope** | Deep comparison of files/archives | Nothing exists | | **sarif** | SARIF static analysis format | **owenrumney/go-sarif** covers this well | So you've already got Go versions of four out of seven. For the remaining three: **SARIF** -- `owenrumney/go-sarif` (80 stars, v3.3.0, Apache-2.0, actively maintained) is solid. It handles parsing, generation, and validation for both SARIF v2.1.0 and v2.2. It's packaged in Fedora and Debian. Unless you need something the library doesn't do, this one doesn't need a from-scratch rewrite. **Changelog parsing** -- the Go ecosystem is thin here. `anton-yurchenko/go-changelog` (3 stars) is the most capable, with typed dates and Keep a Changelog scoped categories (Added/Changed/Fixed etc.). `parkr/changelog` (33 stars) is simpler but more established. Neither is widely adopted. Given the low quality of options, writing your own might make more sense, especially if you want to handle the variety of changelog formats your Ruby gem handles. **Diffoscope** -- nothing in Go does recursive structural comparison across arbitrary archive formats. `diffoci` (551 stars) does this for container images specifically, and you already have an `archives` module in git-pkgs that reads zip/tar/gem formats. But a general-purpose diffoscope equivalent that unpacks nested archives and does format-aware diffing doesn't exist. This would be the biggest lift to build. ## User ok cool, i have made a changelog folder, lets make a go equiv of https://github.com/andrew/changelog-parser ## Assistant ## Assistant ### Tool: EnterPlanMode **Args:** ```json {} ``` ## Assistant **Result** (success): ``` Entered plan mode. You should now focus on exploring the codebase and designing an implementation approach. In plan mode, you should: 1. Thoroughly explore the codebase to understand existing patterns 2. Identify similar features and architectural approaches 3. Consider multiple approaches and their trade-offs 4. Use AskUserQuestion if you need to clarify the approach 5. Design a concrete implementation strategy 6. When ready, use ExitPlanMode to present your plan for approval Remember: DO NOT write or edit any files yet. This is a read-only exploration and planning phase. ``` ## Assistant Let me explore the Ruby gem and the local codebase in parallel. ## Assistant ### Tool: Task **Args:** ```json { "description": "Explore Ruby changelog-parser gem", "prompt": "Clone the repo https://github.com/andrew/changelog-parser into /tmp/changelog-parser and thoroughly explore the codebase. I need to understand:\n\n1. The full API surface - all public classes, methods, and their signatures\n2. What changelog formats it supports (keep a changelog, conventional, etc.)\n3. How it parses changelogs - the parsing strategy/algorithm\n4. The data structures it returns (what fields, types)\n5. All test cases and edge cases it handles\n6. The README/docs for usage examples\n\nRead every Ruby file and every test file. Give me a complete picture of what this gem does.", "subagent_type": "Explore" } ``` ## Assistant ### Tool: Task **Args:** ```json { "description": "Explore git-pkgs Go patterns", "prompt": "Explore the /Users/andrew/code/git-pkgs codebase to understand the patterns used for Go library modules. Specifically look at:\n\n1. The `purl` module - its directory structure, go.mod, public API, test patterns\n2. The `vers` module - same things\n3. The `spdx` module - same things\n4. The newly created `changelog` folder - what's already there\n\nI need to understand:\n- How go.mod files are structured (module paths, Go version)\n- How public APIs are exposed (package naming, exported types/functions)\n- Test file conventions (test framework, table-driven tests, fixtures)\n- Any shared patterns across modules (error handling, option patterns, etc.)\n- What's in the changelog folder already\n\nFocus on the API surface and test patterns, not implementation details. Read go.mod files, the main .go files that define public types/functions, and a representative test file from each module.", "subagent_type": "Explore" } ``` ## Assistant **Result** (success): ``` Perfect! Now I have a comprehensive understanding of the codebase. Let me compile my findings into a clear report. ## Codebase Exploration Report: Go Library Modules ### Directory Structure Overview The git-pkgs codebase contains three mature library modules plus a newly created `changelog` folder: - `/Users/andrew/code/git-pkgs/purl` - Package URL utilities - `/Users/andrew/code/git-pkgs/vers` - Version range parsing and comparison - `/Users/andrew/code/git-pkgs/spdx` - SPDX license expression parsing - `/Users/andrew/code/git-pkgs/changelog` - Empty folder (newly created) --- ### 1. Module Structure: go.mod Files All modules follow a consistent pattern: **purl (go.mod)** ``` module github.com/git-pkgs/purl go 1.25.6 require ( github.com/git-pkgs/packageurl-go v0.2.1 github.com/git-pkgs/vers v0.2.2 ) ``` **vers (go.mod)** ``` module github.com/git-pkgs/vers go 1.25.6 ``` **spdx (go.mod)** ``` module github.com/git-pkgs/spdx go 1.25.6 require github.com/github/go-spdx/v2 v2.3.6 ``` **Key observations:** - All use Go 1.25.6 - Module paths use `github.com/git-pkgs/` format - Minimal dependencies (vers has none; purl depends on packageurl-go and vers; spdx depends on go-spdx) - Each module is independently versioned as a separate git repository --- ### 2. Public API Patterns #### Type Definition Pattern Each module exports a primary type or interface: **purl** - `type PURL struct` - wraps `packageurl.PackageURL` (composition pattern) - `type TypeConfig struct` - configuration for PURL types (embedded JSON data) - `type RegistryConfig struct` - registry URL templates - `type RegistryComponents struct` - metadata about registry URL components **vers** - `type Range struct` - represents version ranges with intervals - `type Interval struct` - single version bound - `type VersionInfo struct` - parsed version components - `type Constraint struct` - single version constraint - `type Parser struct` - stateless parser **spdx** - `type Expression interface` - polymorphic expression type - `type License struct` - concrete license implementation - `type LicenseRef struct` - custom license reference - `type Category string` - enum of license categories - Note: Uses interfaces to allow different expression types #### Constructor Functions All modules use simple, idiomatic Go constructors: ```go // purl - Parse strings, create from components func Parse(s string) (*PURL, error) func New(purlType, namespace, name, version string, qualifiers map[string]string) *PURL // vers - Multiple constructors for different sources func Parse(versURI string) (*Range, error) func ParseNative(constraint string, scheme string) (*Range, error) func ParseVersion(s string) (*VersionInfo, error) // spdx - Normalize and validate licenses func Normalize(license string) (string, error) func NormalizeExpression(expression string) (string, error) ``` #### Method Receivers Consistent use of receiver style: - Data transformation methods use value receivers when returning new values - Query methods use pointer receivers (or value receivers for small types) ```go // purl - examples of immutability pattern func (p *PURL) WithVersion(version string) *PURL // returns new copy func (p *PURL) WithoutVersion() *PURL // returns new copy func (p *PURL) WithQualifier(key, value string) *PURL // returns new copy // vers - Range query methods func (r *Range) Contains(version string) bool func (r *Range) IsEmpty() bool // spdx - Expression methods func (l *License) String() string func (l *License) Licenses() []string ``` #### Error Handling Consistent error patterns: - Return `(result, error)` tuples - No custom error types; use wrapped errors with descriptive messages - Example: `fmt.Errorf("invalid vers URI format: %s", versURI)` ```go // spdx uses sentinel errors var ErrInvalidLicense = errors.New("invalid license") ``` --- ### 3. Test Patterns #### Test Framework All modules use the standard Go `testing` package (no third-party frameworks): - `import "testing"` - `func TestXxx(t *testing.T)` convention - `t.Run()` for subtests and naming #### Table-Driven Tests Universal pattern across all modules: ```go func TestParse(t *testing.T) { tests := []struct { input string want string wantErr bool // ... other fields }{ {"input1", "expected1", false}, {"input2", "expected2", false}, // ... more cases } for _, tt := range tests { t.Run(tt.input, func(t *testing.T) { got, err := FunctionUnderTest(tt.input) if (err != nil) != tt.wantErr { t.Errorf("error = %v, wantErr %v", err, tt.wantErr) return } if got != tt.want { t.Errorf("got %q, want %q", got, tt.want) } }) } } ``` #### Test Organization - One test file per main module file (e.g., `purl.go` paired with `purl_test.go`) - Focused unit tests with minimal setup - Field-specific assertions (check Type, Namespace, Name separately rather than comparing full objects) #### Fixture Pattern Data-driven tests use inline maps when comprehensive: ```go var normalizeTestCases = map[string]string{ "MIT": "MIT", "Apache 2": "Apache-2.0", "GPL v3": "GPL-3.0-or-later", } func TestNormalize(t *testing.T) { for input, want := range normalizeTestCases { t.Run(input, func(t *testing.T) { // test logic }) } } ``` #### Named Test Cases Some tests use named struct fields for clarity: ```go tests := []struct { name string input string version string want bool }{ {"exact version", "vers:npm/=1.0.0", "1.0.0", true}, } ``` --- ### 4. Shared Patterns Across Modules #### Lazy Initialization with sync.Once Multiple modules cache parsed data at module initialization: **vers** ```go var versionCache = &boundedCache{ items: make(map[string]*VersionInfo), max: 10000, } // Cache with bounded size to prevent memory bloat ``` **spdx** ```go var ( categoryOnce sync.Once categoryMap map[string]Category ) func initCategoryMap() { categoryOnce.Do(func() { // Load and parse data once }) } ``` #### Embedded JSON Data Both purl and spdx embed static data: ```go //go:embed types.json var typesJSON []byte //go:embed licenses.json var licensesJSON []byte ``` This avoids external file dependencies and ensures data availability at runtime. #### Slice Type Wrapping Custom receiver methods on slices (Go 1.18+ style): ```go // purl wraps packageurl.Qualifiers to add methods type PURL struct { packageurl.PackageURL } ``` #### Functional Builders Simple builder patterns without options struct complexity: ```go // purl - qualifiers as map parameter func New(purlType, namespace, name, version string, qualifiers map[string]string) *PURL // vers - range builders as convenience functions func Exact(version string) *Range func GreaterThan(version string, inclusive bool) *Range ``` #### Validation as First-Class Citizens All modules provide validation functions: ```go // purl func IsKnownType(purlType string) bool // vers func Valid(version string) bool // spdx func Valid(expression string) bool func ValidLicense(license string) bool ``` #### Idempotent Operations Methods that transform data return new instances without modifying originals: ```go // purl - creates new PURL with modified version p1 := purl.Parse("pkg:npm/lodash@1.0.0") p2 := p1.WithVersion("2.0.0") // p1.Version still "1.0.0", p2.Version is "2.0.0" ``` #### String Representation All types implement `String()` for printing/serialization: ```go func (p *PURL) String() string func (v *VersionInfo) String() string func (l *License) String() string ``` --- ### 5. API Documentation Pattern Modules use `doc.go` files with package-level documentation: **purl/doc.go** - Organized sections: - Package description and purpose - `# Parsing and Creating PURLs` - with code examples - `# Registry URLs` - with code examples - `# Type Configuration` - with code examples - `# Private Registries` - with code examples Pattern: Brief description followed by `# Section` headings with runnable code examples. --- ### 6. The changelog Folder Status: **Empty directory** (no files) Likely intended for: - Module changelog data (currently not populated) - Future structured changelog entries for the module ecosystem - Could follow a similar embedded data pattern as types.json and licenses.json --- ### 7. Key Design Principles 1. **Minimal Dependencies** - Each module is self-contained with few external deps 2. **Immutability** - Operations return new instances rather than modifying state 3. **Standard Library First** - No reflection, no builders, no options structs 4. **Composition over Inheritance** - PURL embeds PackageURL, doesn't wrap it fully 5. **Interface-Driven** - spdx uses Expression interface for polymorphism 6. **Testing as Documentation** - Table-driven tests serve as examples 7. **Embed Static Data** - JSON data is compiled in, not loaded from files 8. **Error Transparency** - No custom error types, standard wrapped errors 9. **Caching for Performance** - Version parsing cached with bounded size 10. **Convenience Functions** - `Satisfies()`, `Contains()` provide high-level APIs alongside lower-level builders --- ### File Locations for Reference **purl module:** - `/Users/andrew/code/git-pkgs/purl/go.mod` - `/Users/andrew/code/git-pkgs/purl/purl.go` - `/Users/andrew/code/git-pkgs/purl/types.go` - `/Users/andrew/code/git-pkgs/purl/ecosystem.go` - `/Users/andrew/code/git-pkgs/purl/purl_test.go` - `/Users/andrew/code/git-pkgs/purl/ecosystem_test.go` **vers module:** - `/Users/andrew/code/git-pkgs/vers/go.mod` - `/Users/andrew/code/git-pkgs/vers/vers.go` - `/Users/andrew/code/git-pkgs/vers/version.go` - `/Users/andrew/code/git-pkgs/vers/range.go` - `/Users/andrew/code/git-pkgs/vers/constraint.go` - `/Users/andrew/code/git-pkgs/vers/parser.go` - `/Users/andrew/code/git-pkgs/vers/version_test.go` - `/Users/andrew/code/git-pkgs/vers/parser_test.go` **spdx module:** - `/Users/andrew/code/git-pkgs/spdx/go.mod` - `/Users/andrew/code/git-pkgs/spdx/spdx.go` - `/Users/andrew/code/git-pkgs/spdx/category.go` - `/Users/andrew/code/git-pkgs/spdx/parse.go` - `/Users/andrew/code/git-pkgs/spdx/parse_lax.go` - `/Users/andrew/code/git-pkgs/spdx/spdx_test.go` agentId: aa93afc (for resuming to continue this agent's work if needed) total_tokens: 48590 tool_uses: 25 duration_ms: 49134 ``` ## Assistant **Result** (success): ``` Perfect! Now I have a complete understanding. Let me compile a comprehensive report: ## Changelog Parser Gem - Complete Analysis I've thoroughly explored the changelog-parser gem. Here's a complete picture of what it does: ### Overview The `changelog-parser` gem is a Ruby library (v0.2.0) that parses changelog files into structured data. It supports multiple changelog formats and provides both a Ruby API and command-line interface for accessing and querying changelog content. ### Public API Surface #### Main Class: `Changelog::Parser` **Constructor:** ```ruby Changelog::Parser.new(changelog, format: nil, version_pattern: nil, match_group: 1) ``` **Instance Methods:** - `parse()` - Returns a hash of all versions with their dates and content - `versions()` - Returns an array of version strings in order - `[](version)` - Bracket accessor to get a specific version entry - `to_h()` - Alias for parse() - `to_json(*)` - Converts parsed result to JSON - `to_html()` - Converts markdown content to HTML (requires markdown gem) - `render_html(content)` - Internal HTML rendering method - `between(old_version, new_version)` - Extracts changelog content between two versions (supports ascending/descending order, nil boundaries) - `line_for_version(version)` - Finds the line number of a version header - `find_version_matches()` - Internal method using StringScanner to find all version headers - `extract_date(match_data)` - Internal date extraction - `build_entry(match, content)` - Internal entry construction - `resolve_pattern(format, custom_pattern)` - Internal pattern resolution - `detect_format()` - Internal format detection **Class Methods:** - `Changelog::Parser.parse(changelog, **options)` - Parse a string - `Changelog::Parser.parse_file(path, **options)` - Parse a file by path - `Changelog::Parser.find_changelog(directory)` - Locate changelog file in a directory - `Changelog::Parser.find_and_parse(directory, **options)` - Find and parse in one step **Constants & Error Classes:** - `VERSION = "0.2.0"` - `Changelog::Parser::Error` - Base exception - `Changelog::Parser::ParseError` - Parse-specific exception ### Supported Changelog Formats The parser supports three built-in formats with automatic detection: #### 1. Keep a Changelog (Default) Pattern: `## [VERSION] - YYYY-MM-DD` or `## [Unreleased]` ```markdown ## [Unreleased] ## [1.0.0] - 2024-01-15 ### Added - Feature ``` Uses: `KEEP_A_CHANGELOG` regex #### 2. Markdown Headers Pattern: `## VERSION` or `### vVERSION (YYYY-MM-DD)` ```markdown ## 2.0.0 (2024-03-01) ## 1.5.0 ### 1.4.2 (2024-01-10) ``` Uses: `MARKDOWN_HEADER` regex (supports 1-3 hashes, optional `v` prefix, optional dates) #### 3. Underline Style (Setext) Pattern: `VERSION` followed by `=====` or `-----` ```markdown 1.0.0 ===== 2.1.0 ----- ``` Uses: `UNDERLINE_HEADER` regex #### 4. Custom Patterns Users can provide their own regex: ```ruby pattern = /^Version ([\d.]+) released (\d{4}-\d{2}-\d{2})/ parser = Changelog::Parser.new(content, version_pattern: pattern) ``` First capture group must be the version, optional second group is the date. ### Data Structures Returned **Standard Parser Output:** ```ruby { "VERSION_STRING" => { date: Date.new(2024, 1, 15), # nil for Unreleased content: "### Added\n- Feature\n..." } } ``` **to_html() Output:** ```ruby { "VERSION_STRING" => { date: Date.new(2024, 1, 15), content: "

Added

" } } ``` **to_json() Output:** - Same structure as parse() but serialized as JSON (dates converted to ISO strings) **versions() Output:** ```ruby ["Unreleased", "1.1.0", "1.0.1", "1.0.0"] ``` **between() Output:** ```ruby "## [1.1.0] - 2024-03-15\n\n### Added\n...\n## [1.0.1] - 2024-02-01" ``` ### Parsing Strategy The parser uses a **StringScanner-based approach**: 1. **Format Detection** (if not explicit): - Tests for Keep a Changelog pattern first - Falls back to Underline if not found - Defaults to Markdown Headers 2. **Version Discovery**: - Scans the entire changelog with the selected regex pattern - Captures version string and optional date for each match - Stores match positions (start/end) 3. **Content Extraction**: - Content for each version spans from end of header to start of next header - Last version's content extends to end of file - Content is stripped of leading/trailing whitespace 4. **Date Parsing**: - Extracts date from regex capture group (if present) - Uses `Date.parse()` with rescue fallback if parsing fails - Returns nil for unparseable dates ### Version Matching The `line_for_version()` method handles intelligent version lookup: - Strips `v` prefix from search strings - Uses regex word boundaries to avoid substring matches (e.g., 1.0.1 won't match 1.0.10) - Excludes version range patterns like `1.0.0..2.0.0` - Recognizes multiple version header styles: - Markdown headers (`#`, `##`, `###`) - Underlined versions (`===`, `---`) - Bullet points (`- version X`) - Colons (`1.0.0: Description`) - Bracket notation (`[1.0.0]`) - ISO dates (`2024-01-15`) ### Finding Changelog Files `find_changelog()` searches for common filenames in priority order: - changelog, news, changes, history, release, whatsnew, releases - Matches with extensions: .md, .txt, .rst, .rdoc, .markdown (case-insensitive) - Filters out .sh files - Size validation: 100-1,000,000 bytes ### Vandamme Compatibility Layer For projects migrating from the `vandamme` gem: ```ruby require "changelog/parser/vandamme" parser = Vandamme::Parser.new( changelog: content, version_header_exp: pattern, format: :markdown, match_group: 1 ) parser.parse # Returns plain strings, not hashes parser.to_html # Returns strings of HTML, not structured hashes ``` ### Test Coverage - Edge Cases Handled The gem has 48+ tests covering: 1. **Format Detection**: Auto-detect all three formats 2. **Version Formats**: - Prerelease versions (1.0.0-beta.1) - Build metadata (1.0.0+build.123) - Complex prerelease (2.0.0-x.7.z.92) - Unreleased sections (no date) - With v prefix stripping 3. **Content Preservation**: - Markdown links intact - Inline code preserved - Mixed list markers (-, *) - Nested lists - Link references at end 4. **Version Boundary Issues**: - Substring matching avoidance (1.0.1 vs 1.0.10) - Range notation exclusion (1.0.0..2.0.0) - Empty version content handling - Version order preservation (as-is, not sorted) 5. **Between() Method**: - Extract between two versions - Extract from start to version - Extract from version to end - Handles ascending and descending changelogs - Handles neither version found 6. **File Operations**: - Empty changelogs - Nil input - Parse file by path - Find changelog in directory - Find and parse combined 7. **HTML Conversion**: - Supports commonmarker, redcarpet, kramdown - Raises error if no markdown gem installed - Preserves dates in HTML output 8. **CLI Operations**: - Parse to JSON - List versions - Show specific version - Extract between versions - Validate against Keep a Changelog format - Pretty JSON output - Stdin input support ### Command-Line Interface Available commands: - `parse [file]` - Default, outputs JSON - `list [file]` - List version numbers - `show VERSION [file]` - Show content for version - `between VERSION1 VERSION2 [file]` - Extract between versions - `validate [file]` - Validate against Keep a Changelog Options: - `-f, --format` - Specify format (keep_a_changelog, markdown, underline) - `-p, --pattern` - Custom regex pattern - `-m, --match-group` - Regex capture group for version (default: 1) - `--pretty` - Pretty print JSON - `-h, --help` - Show help - `--version` - Show gem version ### Dependencies - Ruby >= 3.2.0 required - Core: Only standard library (strscan, date, json, optparse) - Optional: commonmarker, redcarpet, or kramdown for HTML conversion ### HTML Rendering Auto-detects installed markdown gems in order: 1. Commonmarker (via `Commonmarker.to_html`) 2. CommonMarker (via `CommonMarker.render_html`) 3. Redcarpet (via Redcarpet::Markdown) 4. Kramdown (via Kramdown::Document) Raises `Changelog::Parser::Error` if none available but to_html() called. ### Validation Logic The validate command checks: - At least one version found - Presence of [Unreleased] section (warning) - Versions have content (warning) - Dates in descending order (warning) - All versions except Unreleased have dates (warning) - Only errors prevent success exit --- **Repository Structure:** - `/tmp/changelog-parser/lib/changelog/parser.rb` - Main parser (236 lines) - `/tmp/changelog-parser/lib/changelog/parser/vandamme.rb` - Compatibility layer (46 lines) - `/tmp/changelog-parser/lib/changelog/parser/version.rb` - Version constant - `/tmp/changelog-parser/exe/changelog-parser` - CLI executable (235 lines) - `/tmp/changelog-parser/test/changelog/test_parser.rb` - 50 parser tests - `/tmp/changelog-parser/test/changelog/test_vandamme.rb` - 15 vandamme tests - `/tmp/changelog-parser/test/changelog/test_cli.rb` - 20 CLI tests agentId: aca1b14 (for resuming to continue this agent's work if needed) total_tokens: 38850 tool_uses: 18 duration_ms: 59763 ``` ## Assistant ## Assistant Good, I have a solid picture of both the Ruby gem and the Go module conventions. Let me read a couple of representative files to confirm patterns, then design the implementation. ## Assistant ### Tool: Read **Args:** ```json { "file_path": "/Users/andrew/code/git-pkgs/spdx/go.mod" } ``` ## Assistant **Result** (success): ``` 1→module github.com/git-pkgs/spdx 2→ 3→go 1.25.6 4→ 5→require github.com/github/go-spdx/v2 v2.3.6 6→ ``` ## Assistant ### Tool: Read **Args:** ```json { "file_path": "/Users/andrew/code/git-pkgs/spdx/spdx.go" } ``` ## Assistant **Result** (success): ``` 1→// Package spdx provides SPDX license expression parsing, normalization, and validation. 2→// It normalizes informal license strings (like "Apache 2" or "MIT License") to valid 3→// SPDX identifiers (like "Apache-2.0" or "MIT"), and validates/parses SPDX expressions. 4→package spdx 5→ 6→import ( 7→ "errors" 8→ "strings" 9→ 10→ "github.com/github/go-spdx/v2/spdxexp" 11→) 12→ 13→// ErrInvalidLicense is returned when a license string cannot be normalized or validated. 14→var ErrInvalidLicense = errors.New("invalid license") 15→ 16→// Normalize converts an informal license string to a valid SPDX identifier. 17→// It handles common variations like "Apache 2", "MIT License", "GPL v3", etc. 18→// Returns the normalized SPDX identifier or an error if normalization fails. 19→// 20→// Example: 21→// 22→// Normalize("Apache 2") // returns "Apache-2.0", nil 23→// Normalize("MIT License") // returns "MIT", nil 24→// Normalize("GPL v3") // returns "GPL-3.0-or-later", nil 25→// Normalize("UNKNOWN-LICENSE") // returns "", ErrInvalidLicense 26→func Normalize(license string) (string, error) { 27→ license = strings.TrimSpace(license) 28→ if license == "" { 29→ return "", ErrInvalidLicense 30→ } 31→ 32→ // Try exact match first (case-insensitive) 33→ if id := lookupLicense(license); id != "" { 34→ return upgradeGPL(id), nil 35→ } 36→ 37→ // Try with trailing + removed, then upgrade the result 38→ noPlus := strings.TrimSuffix(strings.TrimSpace(license), "+") 39→ if noPlus != license { 40→ if id := lookupLicense(noPlus); id != "" { 41→ return upgradeGPL(id + "+"), nil 42→ } 43→ } 44→ 45→ // Apply transforms 46→ if result := tryTransforms(license); result != "" { 47→ return result, nil 48→ } 49→ 50→ // Apply transpositions with transforms 51→ if result := tryTranspositions(license); result != "" { 52→ return result, nil 53→ } 54→ 55→ // Last resort: substring matching 56→ if result := tryLastResorts(license); result != "" { 57→ return result, nil 58→ } 59→ 60→ // Transpositions with last resorts 61→ if result := tryTranspositionsWithLastResorts(license); result != "" { 62→ return result, nil 63→ } 64→ 65→ return "", ErrInvalidLicense 66→} 67→ 68→// NormalizeExpression normalizes an SPDX expression, converting each license 69→// identifier to its canonical form and ensuring proper operator precedence. 70→// This only handles case normalization of already-valid SPDX identifiers. 71→// For informal license names like "Apache 2", use NormalizeExpressionLax. 72→// 73→// Example: 74→// 75→// NormalizeExpression("mit OR apache-2.0") 76→// // returns "MIT OR Apache-2.0", nil 77→// 78→// NormalizeExpression("mit OR gpl-2.0 AND apache-2.0") 79→// // returns "MIT OR (GPL-2.0 AND Apache-2.0)", nil 80→func NormalizeExpression(expression string) (string, error) { 81→ expr, err := Parse(expression) 82→ if err != nil { 83→ return "", err 84→ } 85→ return expr.String(), nil 86→} 87→ 88→// NormalizeExpressionLax normalizes an SPDX expression with lax handling of 89→// informal license names. It converts informal names like "Apache 2" or 90→// "MIT License" to their canonical SPDX forms within expressions. 91→// 92→// Example: 93→// 94→// NormalizeExpressionLax("Apache 2 OR MIT License") 95→// // returns "Apache-2.0 OR MIT", nil 96→// 97→// NormalizeExpressionLax("GPL v3 AND BSD 3-Clause") 98→// // returns "GPL-3.0-or-later AND BSD-3-Clause", nil 99→func NormalizeExpressionLax(expression string) (string, error) { 100→ expr, err := ParseLax(expression) 101→ if err != nil { 102→ return "", err 103→ } 104→ return expr.String(), nil 105→} 106→ 107→// Valid checks if the given string is a valid SPDX expression. 108→// This performs strict validation - informal license names like "Apache 2" are not valid. 109→// Returns true if valid, false otherwise. 110→func Valid(expression string) bool { 111→ _, err := ParseStrict(expression) 112→ return err == nil 113→} 114→ 115→// ValidLicense checks if the given string is a valid SPDX license identifier. 116→// Returns true if valid, false otherwise. 117→func ValidLicense(license string) bool { 118→ return lookupLicense(license) != "" 119→} 120→ 121→// Satisfies checks if the allowed licenses satisfy the given SPDX expression. 122→// This is a convenience wrapper around github.com/github/go-spdx/v2/spdxexp.Satisfies. 123→func Satisfies(expression string, allowed []string) (bool, error) { 124→ return spdxexp.Satisfies(expression, allowed) 125→} 126→ 127→// ExtractLicenses extracts all unique license identifiers from an SPDX expression. 128→// Returns a slice of license identifiers or an error if parsing fails. 129→// 130→// Example: 131→// 132→// ExtractLicenses("MIT OR Apache-2.0") 133→// // returns ["MIT", "Apache-2.0"], nil 134→// 135→// ExtractLicenses("(MIT AND GPL-2.0) OR Apache-2.0") 136→// // returns ["Apache-2.0", "GPL-2.0", "MIT"], nil 137→func ExtractLicenses(expression string) ([]string, error) { 138→ return spdxexp.ExtractLicenses(expression) 139→} 140→ 141→// ValidateLicenses checks if all given license identifiers are valid SPDX identifiers. 142→// Returns true and nil if all are valid, or false and the list of invalid licenses. 143→func ValidateLicenses(licenses []string) (bool, []string) { 144→ return spdxexp.ValidateLicenses(licenses) 145→} 146→ ``` ## Assistant ### Tool: Read **Args:** ```json { "file_path": "/Users/andrew/code/git-pkgs/spdx/spdx_test.go", "limit": 100 } ``` ## Assistant **Result** (success): ``` 1→package spdx 2→ 3→import ( 4→ "testing" 5→) 6→ 7→// Test cases from spdx-correct.js 8→var normalizeTestCases = map[string]string{ 9→ // Simple identifiers (case normalization) 10→ "MIT": "MIT", 11→ "mit": "MIT", 12→ "Mit": "MIT", 13→ "MiT": "MIT", 14→ "Apache-2.0": "Apache-2.0", 15→ "apache-2.0": "Apache-2.0", 16→ "GPL-3.0-only": "GPL-3.0-only", 17→ "gpl-3.0-only": "GPL-3.0-only", 18→ "BSD-3-Clause": "BSD-3-Clause", 19→ "bsd-3-clause": "BSD-3-Clause", 20→ "ISC": "ISC", 21→ "isc": "ISC", 22→ "Isc": "ISC", 23→ 24→ // Apache variations 25→ "Apache 2": "Apache-2.0", 26→ "Apache 2.0": "Apache-2.0", 27→ "APACHE 2": "Apache-2.0", 28→ "APACHE 2.0": "Apache-2.0", 29→ "APACHE-2": "Apache-2.0", 30→ "APACHE-2.0": "Apache-2.0", 31→ "Apache": "Apache-2.0", 32→ "APACHE": "Apache-2.0", 33→ "Apache License": "Apache-2.0", 34→ "Apache License 2.0": "Apache-2.0", 35→ "Apache License, Version 2.0": "Apache-2.0", 36→ "Apache License Version 2.0": "Apache-2.0", 37→ "Apache License v2": "Apache-2.0", 38→ "Apache License v2.0": "Apache-2.0", 39→ "Apache License V2": "Apache-2.0", 40→ "Apache License V2.0": "Apache-2.0", 41→ "Apache V2": "Apache-2.0", 42→ "Apache V2.0": "Apache-2.0", 43→ "Apache v2": "Apache-2.0", 44→ "Apache v2.0": "Apache-2.0", 45→ "Apache2": "Apache-2.0", 46→ "Apache2.0": "Apache-2.0", 47→ "Apache-v2": "Apache-2.0", 48→ "Apache-v2.0": "Apache-2.0", 49→ "APL 2.0": "Apache-2.0", 50→ "APL": "Apache-2.0", 51→ "APL2": "Apache-2.0", 52→ "Apache Software License 2.0": "Apache-2.0", 53→ 54→ // MIT variations 55→ "MIT License": "MIT", 56→ "MIT Licence": "MIT", 57→ "MIT license": "MIT", 58→ "MIT-License": "MIT", 59→ "MIT-LICENSE": "MIT", 60→ "M.I.T": "MIT", 61→ "M.I.T.": "MIT", 62→ "MTI": "MIT", 63→ 64→ // GPL variations 65→ "GPL": "GPL-3.0-or-later", 66→ "GPL 2": "GPL-2.0-only", 67→ "GPL 2.0": "GPL-2.0-only", 68→ "GPL 3": "GPL-3.0-or-later", 69→ "GPL 3.0": "GPL-3.0-or-later", 70→ "GPL v2": "GPL-2.0-only", 71→ "GPL v3": "GPL-3.0-or-later", 72→ "GPL V2": "GPL-2.0-only", 73→ "GPL V3": "GPL-3.0-or-later", 74→ "GPL-2": "GPL-2.0-only", 75→ "GPL-3": "GPL-3.0-or-later", 76→ "GPL2": "GPL-2.0-only", 77→ "GPL3": "GPL-3.0-or-later", 78→ "GPLv2": "GPL-2.0-only", 79→ "GPLv3": "GPL-3.0-or-later", 80→ "GPLV2": "GPL-2.0-only", 81→ "GPLV3": "GPL-3.0-or-later", 82→ "Gpl": "GPL-3.0-or-later", 83→ "GNU GPL": "GPL-3.0-or-later", 84→ "GNU GPL v2": "GPL-2.0-only", 85→ "GNU GPL v3": "GPL-3.0-or-later", 86→ "GNU GPLv2": "GPL-2.0-only", 87→ "GNU GPLv3": "GPL-3.0-or-later", 88→ "GNU GENERAL PUBLIC LICENSE": "GPL-3.0-or-later", 89→ "GNU General Public License": "GPL-3.0-or-later", 90→ "GNU General Public License v2.0": "GPL-2.0-only", 91→ "GNU General Public License v3": "GPL-3.0-or-later", 92→ "GNU": "GPL-3.0-or-later", 93→ 94→ // LGPL variations 95→ "LGPL": "LGPL-3.0-or-later", 96→ "LGPL 2.1": "LGPL-2.1-only", 97→ "LGPL 3": "LGPL-3.0-or-later", 98→ "LGPL 3.0": "LGPL-3.0-or-later", 99→ "LGPL v2": "LGPL-2.0-only", 100→ "LGPL v3": "LGPL-3.0-or-later", ``` ## Assistant ## Assistant Let me read the Ruby parser source to understand the exact regex patterns and parsing logic. ## Assistant ### Tool: Read **Args:** ```json { "file_path": "/tmp/changelog-parser/lib/changelog/parser.rb" } ``` ## Assistant **Result** (success): ``` 1→# frozen_string_literal: true 2→ 3→require_relative "parser/version" 4→ 5→module Changelog 6→ class Parser 7→ class Error < StandardError; end 8→ class ParseError < Error; end 9→ 10→ # Keep a Changelog format: ## [1.0.0] - 2024-01-15 or ## [Unreleased] 11→ KEEP_A_CHANGELOG = /^##\s+\[([^\]]+)\](?:\s+-\s+(\d{4}-\d{2}-\d{2}))?/ 12→ 13→ # Markdown headers with version: ## 1.0.0 or ### v1.0.0 (2024-01-15) 14→ MARKDOWN_HEADER = /^\#{1,3}\s+v?([\w.+-]+\.[\w.+-]+[a-zA-Z0-9])(?:\s+\((\d{4}-\d{2}-\d{2})\))?/ 15→ 16→ # Underline style: 1.0.0\n===== or 1.0.0\n----- 17→ UNDERLINE_HEADER = /^([\w.+-]+\.[\w.+-]+[a-zA-Z0-9])\n[=-]+/ 18→ 19→ FORMATS = { 20→ keep_a_changelog: KEEP_A_CHANGELOG, 21→ markdown: MARKDOWN_HEADER, 22→ underline: UNDERLINE_HEADER 23→ }.freeze 24→ 25→ # Common changelog filenames in priority order (from Dependabot) 26→ CHANGELOG_FILENAMES = %w[ 27→ changelog 28→ news 29→ changes 30→ history 31→ release 32→ whatsnew 33→ releases 34→ ].freeze 35→ 36→ attr_reader :changelog, :version_pattern, :match_group 37→ 38→ def initialize(changelog, format: nil, version_pattern: nil, match_group: 1) 39→ @changelog = changelog.to_s 40→ @version_pattern = resolve_pattern(format, version_pattern) 41→ @match_group = match_group 42→ end 43→ 44→ def parse 45→ return {} if changelog.empty? 46→ 47→ versions = {} 48→ matches = find_version_matches 49→ 50→ matches.each_with_index do |match, index| 51→ version = match[:version] 52→ start_pos = match[:end_pos] 53→ end_pos = matches[index + 1]&.dig(:start_pos) || changelog.length 54→ 55→ content = changelog[start_pos...end_pos].strip 56→ versions[version] = build_entry(match, content) 57→ end 58→ 59→ versions 60→ end 61→ 62→ def versions 63→ parse.keys 64→ end 65→ 66→ def [](version) 67→ parse[version] 68→ end 69→ 70→ def to_h 71→ parse 72→ end 73→ 74→ def to_json(*) 75→ require "json" 76→ parse.to_json 77→ end 78→ 79→ def to_html 80→ parse.transform_values do |entry| 81→ { 82→ date: entry[:date], 83→ content: render_html(entry[:content]) 84→ } 85→ end 86→ end 87→ 88→ def render_html(content) 89→ return content if content.nil? || content.empty? 90→ 91→ if defined?(Commonmarker) 92→ Commonmarker.to_html(content) 93→ elsif defined?(CommonMarker) 94→ CommonMarker.render_html(content) 95→ elsif defined?(Redcarpet) 96→ markdown = Redcarpet::Markdown.new(Redcarpet::Render::HTML) 97→ markdown.render(content) 98→ elsif defined?(Kramdown) 99→ Kramdown::Document.new(content).to_html 100→ else 101→ raise Error, "No markdown renderer found. Install commonmarker, redcarpet, or kramdown." 102→ end 103→ end 104→ 105→ def between(old_version, new_version) 106→ old_line = line_for_version(old_version) 107→ new_line = line_for_version(new_version) 108→ lines = changelog.split("\n") 109→ 110→ range = if old_line && new_line 111→ old_line < new_line ? (old_line..-1) : (new_line..old_line - 1) 112→ elsif old_line 113→ old_line.zero? ? nil : (0..old_line - 1) 114→ elsif new_line 115→ (new_line..-1) 116→ end 117→ 118→ return nil unless range 119→ 120→ lines[range]&.join("\n")&.rstrip 121→ end 122→ 123→ def line_for_version(version) 124→ return nil unless version 125→ 126→ version = version.to_s.gsub(/^v/i, "") 127→ escaped = Regexp.escape(version) 128→ lines = changelog.split("\n") 129→ 130→ lines.find_index.with_index do |line, index| 131→ next false unless line.match?(/(? 1_000_000 || size < 100 168→ 169→ return path 170→ end 171→ end 172→ 173→ nil 174→ end 175→ 176→ def self.find_and_parse(directory = ".", **options) 177→ path = find_changelog(directory) 178→ return nil unless path 179→ 180→ parse_file(path, **options) 181→ end 182→ 183→ def resolve_pattern(format, custom_pattern) 184→ return custom_pattern if custom_pattern 185→ return FORMATS.fetch(format) if format 186→ 187→ detect_format 188→ end 189→ 190→ def detect_format 191→ return KEEP_A_CHANGELOG if changelog.match?(KEEP_A_CHANGELOG) 192→ return UNDERLINE_HEADER if changelog.match?(UNDERLINE_HEADER) 193→ 194→ MARKDOWN_HEADER 195→ end 196→ 197→ def find_version_matches 198→ matches = [] 199→ scanner = StringScanner.new(changelog) 200→ 201→ while scanner.scan_until(version_pattern) 202→ matched = scanner.matched 203→ match_data = matched.match(version_pattern) 204→ 205→ matches << { 206→ version: match_data[match_group], 207→ date: extract_date(match_data), 208→ start_pos: scanner.pos - matched.length, 209→ end_pos: scanner.pos 210→ } 211→ end 212→ 213→ matches 214→ end 215→ 216→ def extract_date(match_data) 217→ return nil if match_data.captures.length < 2 218→ 219→ date_str = match_data[match_group + 1] 220→ return nil unless date_str 221→ 222→ Date.parse(date_str) rescue nil 223→ end 224→ 225→ def build_entry(match, content) 226→ { 227→ date: match[:date], 228→ content: content 229→ } 230→ end 231→ end 232→end 233→ 234→require "strscan" 235→require "date" 236→ ``` ## Assistant ### Tool: Read **Args:** ```json { "file_path": "/tmp/changelog-parser/test/changelog/test_parser.rb" } ``` ## Assistant **Result** (success): ``` 1→# frozen_string_literal: true 2→ 3→require "test_helper" 4→ 5→class TestParser < Minitest::Test 6→ def test_version_number 7→ refute_nil Changelog::Parser::VERSION 8→ end 9→ 10→ def test_parse_empty_changelog 11→ result = Changelog::Parser.parse("") 12→ assert_equal({}, result) 13→ end 14→ 15→ def test_parse_nil_changelog 16→ result = Changelog::Parser.parse(nil) 17→ assert_equal({}, result) 18→ end 19→end 20→ 21→class TestKeepAChangelogFormat < Minitest::Test 22→ def setup 23→ @changelog = File.read(fixture_path("keep_a_changelog.md")) 24→ @parser = Changelog::Parser.new(@changelog) 25→ end 26→ 27→ def test_detects_keep_a_changelog_format 28→ assert_equal Changelog::Parser::KEEP_A_CHANGELOG, @parser.version_pattern 29→ end 30→ 31→ def test_parses_all_versions 32→ result = @parser.parse 33→ assert_equal 4, result.size 34→ assert_includes result.keys, "Unreleased" 35→ assert_includes result.keys, "1.1.0" 36→ assert_includes result.keys, "1.0.1" 37→ assert_includes result.keys, "1.0.0" 38→ end 39→ 40→ def test_extracts_dates 41→ result = @parser.parse 42→ assert_nil result["Unreleased"][:date] 43→ assert_equal Date.new(2024, 3, 15), result["1.1.0"][:date] 44→ assert_equal Date.new(2024, 2, 1), result["1.0.1"][:date] 45→ assert_equal Date.new(2024, 1, 15), result["1.0.0"][:date] 46→ end 47→ 48→ def test_extracts_content 49→ result = @parser.parse 50→ assert_includes result["1.1.0"][:content], "User authentication system" 51→ assert_includes result["1.1.0"][:content], "Memory leak in connection pool" 52→ assert_includes result["1.0.0"][:content], "Initial release" 53→ end 54→ 55→ def test_versions_method 56→ assert_equal ["Unreleased", "1.1.0", "1.0.1", "1.0.0"], @parser.versions 57→ end 58→ 59→ def test_bracket_accessor 60→ entry = @parser["1.0.1"] 61→ assert_equal Date.new(2024, 2, 1), entry[:date] 62→ assert_includes entry[:content], "Critical bug" 63→ end 64→ 65→ def test_to_h 66→ assert_equal @parser.parse, @parser.to_h 67→ end 68→ 69→ def test_to_json 70→ json = @parser.to_json 71→ parsed = JSON.parse(json) 72→ assert_equal 4, parsed.size 73→ assert_includes parsed.keys, "1.0.0" 74→ end 75→end 76→ 77→class TestMarkdownHeaderFormat < Minitest::Test 78→ def setup 79→ @changelog = File.read(fixture_path("markdown_header.md")) 80→ @parser = Changelog::Parser.new(@changelog, format: :markdown) 81→ end 82→ 83→ def test_parses_versions_with_parenthesized_dates 84→ result = @parser.parse 85→ assert_includes result.keys, "2.0.0" 86→ assert_equal Date.new(2024, 3, 1), result["2.0.0"][:date] 87→ end 88→ 89→ def test_parses_versions_without_dates 90→ result = @parser.parse 91→ assert_includes result.keys, "1.5.0" 92→ assert_nil result["1.5.0"][:date] 93→ end 94→ 95→ def test_parses_h3_headers 96→ result = @parser.parse 97→ assert_includes result.keys, "1.4.2" 98→ end 99→ 100→ def test_extracts_content_correctly 101→ result = @parser.parse 102→ assert_includes result["2.0.0"][:content], "Breaking changes" 103→ assert_includes result["1.5.0"][:content], "caching layer" 104→ end 105→end 106→ 107→class TestUnderlineFormat < Minitest::Test 108→ def setup 109→ @changelog = File.read(fixture_path("underline.md")) 110→ @parser = Changelog::Parser.new(@changelog, format: :underline) 111→ end 112→ 113→ def test_parses_equals_underline 114→ result = @parser.parse 115→ assert_includes result.keys, "3.0.0" 116→ assert_includes result.keys, "2.0.0" 117→ end 118→ 119→ def test_parses_dash_underline 120→ result = @parser.parse 121→ assert_includes result.keys, "2.1.0" 122→ end 123→ 124→ def test_extracts_content 125→ result = @parser.parse 126→ assert_includes result["3.0.0"][:content], "Complete rewrite" 127→ assert_includes result["2.1.0"][:content], "Bug fixes" 128→ end 129→end 130→ 131→class TestCustomPattern < Minitest::Test 132→ def test_custom_regex_pattern 133→ changelog = <<~CHANGELOG 134→ Version 1.2.0 released 2024-01-01 135→ - Feature A 136→ 137→ Version 1.1.0 released 2023-12-01 138→ - Feature B 139→ CHANGELOG 140→ 141→ pattern = /^Version ([\d.]+) released (\d{4}-\d{2}-\d{2})/ 142→ parser = Changelog::Parser.new(changelog, version_pattern: pattern) 143→ result = parser.parse 144→ 145→ assert_equal 2, result.size 146→ assert_includes result.keys, "1.2.0" 147→ assert_includes result.keys, "1.1.0" 148→ assert_equal Date.new(2024, 1, 1), result["1.2.0"][:date] 149→ end 150→ 151→ def test_custom_match_group 152→ changelog = <<~CHANGELOG 153→ ## Release v1.0.0 154→ 155→ Content here 156→ 157→ ## Release v0.9.0 158→ 159→ More content 160→ CHANGELOG 161→ 162→ pattern = /^## Release v([\d.]+)/ 163→ parser = Changelog::Parser.new(changelog, version_pattern: pattern) 164→ result = parser.parse 165→ 166→ assert_equal 2, result.size 167→ assert_includes result.keys, "1.0.0" 168→ assert_includes result.keys, "0.9.0" 169→ end 170→end 171→ 172→class TestClassMethods < Minitest::Test 173→ def test_parse_class_method 174→ changelog = "## [1.0.0] - 2024-01-01\n\nContent" 175→ result = Changelog::Parser.parse(changelog) 176→ 177→ assert_equal 1, result.size 178→ assert_includes result.keys, "1.0.0" 179→ end 180→ 181→ def test_parse_file_class_method 182→ result = Changelog::Parser.parse_file(fixture_path("keep_a_changelog.md")) 183→ 184→ assert_equal 4, result.size 185→ assert_includes result.keys, "1.0.0" 186→ end 187→end 188→ 189→class TestToHtml < Minitest::Test 190→ def setup 191→ @changelog = "## [1.0.0] - 2024-01-01\n\n- Feature one\n- Feature two" 192→ @parser = Changelog::Parser.new(@changelog) 193→ end 194→ 195→ def test_to_html_raises_without_markdown_gem 196→ skip if markdown_gem_available? 197→ 198→ assert_raises(Changelog::Parser::Error) do 199→ @parser.to_html 200→ end 201→ end 202→ 203→ def test_to_html_returns_hash_structure_with_markdown_gem 204→ skip unless markdown_gem_available? 205→ 206→ result = @parser.to_html 207→ assert_instance_of Hash, result["1.0.0"] 208→ assert result["1.0.0"].key?(:date) 209→ assert result["1.0.0"].key?(:content) 210→ end 211→ 212→ def test_to_html_converts_markdown_with_markdown_gem 213→ skip unless markdown_gem_available? 214→ 215→ result = @parser.to_html 216→ assert_includes result["1.0.0"][:content], "
  • " 217→ end 218→ 219→ def test_to_html_preserves_date 220→ skip unless markdown_gem_available? 221→ 222→ result = @parser.to_html 223→ assert_equal Date.new(2024, 1, 1), result["1.0.0"][:date] 224→ end 225→ 226→ def markdown_gem_available? 227→ defined?(Commonmarker) || defined?(CommonMarker) || defined?(Redcarpet) || defined?(Kramdown) 228→ end 229→end 230→ 231→class TestFormatDetection < Minitest::Test 232→ def test_auto_detects_keep_a_changelog 233→ changelog = "## [1.0.0] - 2024-01-01\n\nContent" 234→ parser = Changelog::Parser.new(changelog) 235→ assert_equal Changelog::Parser::KEEP_A_CHANGELOG, parser.version_pattern 236→ end 237→ 238→ def test_auto_detects_underline_format 239→ changelog = "1.0.0\n=====\n\nContent" 240→ parser = Changelog::Parser.new(changelog) 241→ assert_equal Changelog::Parser::UNDERLINE_HEADER, parser.version_pattern 242→ end 243→ 244→ def test_falls_back_to_markdown_header 245→ changelog = "## 1.0.0\n\nContent" 246→ parser = Changelog::Parser.new(changelog) 247→ assert_equal Changelog::Parser::MARKDOWN_HEADER, parser.version_pattern 248→ end 249→end 250→ 251→class TestLineForVersion < Minitest::Test 252→ def test_finds_keep_a_changelog_version 253→ changelog = "## [1.0.0] - 2024-01-01\n\nContent" 254→ parser = Changelog::Parser.new(changelog) 255→ 256→ assert_equal 0, parser.line_for_version("1.0.0") 257→ end 258→ 259→ def test_finds_version_with_v_prefix 260→ changelog = "## v1.0.0\n\nContent" 261→ parser = Changelog::Parser.new(changelog) 262→ 263→ assert_equal 0, parser.line_for_version("v1.0.0") 264→ assert_equal 0, parser.line_for_version("1.0.0") 265→ end 266→ 267→ def test_avoids_version_substring_match 268→ changelog = <<~CHANGELOG 269→ ## [1.0.10] - 2024-02-01 270→ 271→ Content for 1.0.10 272→ 273→ ## [1.0.1] - 2024-01-01 274→ 275→ Content for 1.0.1 276→ CHANGELOG 277→ 278→ parser = Changelog::Parser.new(changelog) 279→ assert_equal 0, parser.line_for_version("1.0.10") 280→ assert_equal 4, parser.line_for_version("1.0.1") 281→ end 282→ 283→ def test_avoids_version_range_match 284→ changelog = "Supports versions 1.0.0..2.0.0\n\n## [1.0.0]\n\nContent" 285→ parser = Changelog::Parser.new(changelog) 286→ 287→ assert_equal 2, parser.line_for_version("1.0.0") 288→ end 289→ 290→ def test_finds_underlined_version 291→ changelog = "1.0.0\n=====\n\nContent" 292→ parser = Changelog::Parser.new(changelog) 293→ 294→ assert_equal 0, parser.line_for_version("1.0.0") 295→ end 296→ 297→ def test_finds_bullet_point_version 298→ changelog = "- version 1.0.0\n\nContent" 299→ parser = Changelog::Parser.new(changelog) 300→ 301→ assert_equal 0, parser.line_for_version("1.0.0") 302→ end 303→ 304→ def test_finds_colon_version 305→ changelog = "1.0.0: Initial release\n\nContent" 306→ parser = Changelog::Parser.new(changelog) 307→ 308→ assert_equal 0, parser.line_for_version("1.0.0") 309→ end 310→ 311→ def test_returns_nil_for_missing_version 312→ changelog = "## [1.0.0] - 2024-01-01\n\nContent" 313→ parser = Changelog::Parser.new(changelog) 314→ 315→ assert_nil parser.line_for_version("2.0.0") 316→ end 317→end 318→ 319→class TestBetween < Minitest::Test 320→ def setup 321→ @changelog = <<~CHANGELOG 322→ ## [3.0.0] - 2024-03-01 323→ 324→ Version 3 content 325→ 326→ ## [2.0.0] - 2024-02-01 327→ 328→ Version 2 content 329→ 330→ ## [1.0.0] - 2024-01-01 331→ 332→ Version 1 content 333→ CHANGELOG 334→ @parser = Changelog::Parser.new(@changelog) 335→ end 336→ 337→ def test_extracts_content_between_versions 338→ result = @parser.between("1.0.0", "3.0.0") 339→ 340→ assert_includes result, "Version 3 content" 341→ assert_includes result, "Version 2 content" 342→ refute_includes result, "Version 1 content" 343→ end 344→ 345→ def test_extracts_from_new_version_to_end 346→ result = @parser.between(nil, "2.0.0") 347→ 348→ assert_includes result, "Version 2 content" 349→ assert_includes result, "Version 1 content" 350→ end 351→ 352→ def test_extracts_from_start_to_old_version 353→ result = @parser.between("2.0.0", nil) 354→ 355→ assert_includes result, "Version 3 content" 356→ refute_includes result, "Version 2 content" 357→ end 358→ 359→ def test_returns_nil_when_neither_found 360→ result = @parser.between("9.0.0", "8.0.0") 361→ 362→ assert_nil result 363→ end 364→ 365→ def test_handles_ascending_changelog 366→ changelog = <<~CHANGELOG 367→ ## [1.0.0] - 2024-01-01 368→ 369→ First 370→ 371→ ## [2.0.0] - 2024-02-01 372→ 373→ Second 374→ CHANGELOG 375→ 376→ parser = Changelog::Parser.new(changelog) 377→ result = parser.between("1.0.0", "2.0.0") 378→ 379→ assert_includes result, "Second" 380→ end 381→end 382→ 383→class TestFindChangelog < Minitest::Test 384→ def test_finds_changelog_in_current_directory 385→ path = Changelog::Parser.find_changelog 386→ 387→ assert_equal "./CHANGELOG.md", path 388→ end 389→ 390→ def test_returns_nil_for_empty_directory 391→ Dir.mktmpdir do |dir| 392→ result = Changelog::Parser.find_changelog(dir) 393→ assert_nil result 394→ end 395→ end 396→ 397→ def test_finds_and_parses 398→ result = Changelog::Parser.find_and_parse 399→ 400→ assert_instance_of Hash, result 401→ assert_includes result.keys, "0.1.0" 402→ end 403→end 404→ 405→class TestEdgeCases < Minitest::Test 406→ def test_version_with_prerelease 407→ changelog = "## [1.0.0-beta.1] - 2024-01-01\n\nBeta content" 408→ result = Changelog::Parser.parse(changelog) 409→ 410→ assert_includes result.keys, "1.0.0-beta.1" 411→ end 412→ 413→ def test_version_with_build_metadata 414→ changelog = "## [1.0.0+build.123] - 2024-01-01\n\nBuild content" 415→ result = Changelog::Parser.parse(changelog) 416→ 417→ assert_includes result.keys, "1.0.0+build.123" 418→ end 419→ 420→ def test_complex_prerelease_version 421→ changelog = "## [2.0.0-x.7.z.92] - 2024-01-01\n\nComplex prerelease" 422→ result = Changelog::Parser.parse(changelog) 423→ 424→ assert_includes result.keys, "2.0.0-x.7.z.92" 425→ end 426→ 427→ def test_empty_version_content 428→ changelog = <<~CHANGELOG 429→ ## [2.0.0] - 2024-02-01 430→ 431→ ## [1.0.0] - 2024-01-01 432→ 433→ Some content 434→ CHANGELOG 435→ 436→ result = Changelog::Parser.parse(changelog) 437→ assert_equal "", result["2.0.0"][:content] 438→ assert_includes result["1.0.0"][:content], "Some content" 439→ end 440→ 441→ def test_preserves_version_order 442→ changelog = <<~CHANGELOG 443→ ## [3.0.0] - 2024-03-01 444→ ## [1.0.0] - 2024-01-01 445→ ## [2.0.0] - 2024-02-01 446→ CHANGELOG 447→ 448→ result = Changelog::Parser.parse(changelog) 449→ assert_equal ["3.0.0", "1.0.0", "2.0.0"], result.keys 450→ end 451→ 452→ def test_preserves_markdown_links 453→ changelog = <<~CHANGELOG 454→ ## [1.0.0] - 2024-01-01 455→ 456→ - Added [feature](https://example.com) 457→ - See [docs](https://docs.example.com) for details 458→ CHANGELOG 459→ 460→ result = Changelog::Parser.parse(changelog) 461→ assert_includes result["1.0.0"][:content], "[feature](https://example.com)" 462→ end 463→ 464→ def test_preserves_inline_code 465→ changelog = <<~CHANGELOG 466→ ## [1.0.0] - 2024-01-01 467→ 468→ - Fixed `bug_in_function` method 469→ CHANGELOG 470→ 471→ result = Changelog::Parser.parse(changelog) 472→ assert_includes result["1.0.0"][:content], "`bug_in_function`" 473→ end 474→ 475→ def test_ignores_link_references 476→ changelog = <<~CHANGELOG 477→ ## [1.0.0] - 2024-01-01 478→ 479→ Content here 480→ 481→ [1.0.0]: https://github.com/example/repo/releases/tag/v1.0.0 482→ CHANGELOG 483→ 484→ result = Changelog::Parser.parse(changelog) 485→ assert_equal 1, result.size 486→ assert_includes result["1.0.0"][:content], "[1.0.0]: https://github.com" 487→ end 488→ 489→ def test_handles_mixed_list_markers 490→ changelog = <<~CHANGELOG 491→ ## [1.0.0] - 2024-01-01 492→ 493→ - Dash item 494→ * Asterisk item 495→ - Another dash 496→ CHANGELOG 497→ 498→ result = Changelog::Parser.parse(changelog) 499→ assert_includes result["1.0.0"][:content], "- Dash item" 500→ assert_includes result["1.0.0"][:content], "* Asterisk item" 501→ end 502→ 503→ def test_handles_nested_lists 504→ changelog = <<~CHANGELOG 505→ ## [1.0.0] - 2024-01-01 506→ 507→ - Main item 508→ - Sub item one 509→ - Sub item two 510→ CHANGELOG 511→ 512→ result = Changelog::Parser.parse(changelog) 513→ assert_includes result["1.0.0"][:content], "- Sub item one" 514→ end 515→ 516→ def test_version_with_v_prefix 517→ changelog = "## v1.0.0\n\nContent" 518→ result = Changelog::Parser.parse(changelog, format: :markdown) 519→ 520→ assert_includes result.keys, "1.0.0" 521→ end 522→ 523→ def test_unreleased_section 524→ changelog = <<~CHANGELOG 525→ ## [Unreleased] 526→ 527→ - Work in progress 528→ 529→ ## [1.0.0] - 2024-01-01 530→ 531→ - Released feature 532→ CHANGELOG 533→ 534→ result = Changelog::Parser.parse(changelog) 535→ assert_includes result.keys, "Unreleased" 536→ assert_nil result["Unreleased"][:date] 537→ assert_includes result["Unreleased"][:content], "Work in progress" 538→ end 539→ 540→ def test_version_with_label 541→ changelog = "## [1.0.0] - 2024-01-01 - Codename Phoenix\n\nContent" 542→ result = Changelog::Parser.parse(changelog) 543→ 544→ assert_includes result.keys, "1.0.0" 545→ assert_equal Date.new(2024, 1, 1), result["1.0.0"][:date] 546→ end 547→ 548→ def test_comprehensive_fixture 549→ result = Changelog::Parser.parse_file(fixture_path("comprehensive.md")) 550→ 551→ assert_equal 8, result.size 552→ assert_includes result.keys, "Unreleased" 553→ assert_includes result.keys, "2.0.0-x.7.z.92" 554→ assert_includes result.keys, "1.5.0-beta.2" 555→ assert_includes result.keys, "1.0.0" 556→ end 557→end 558→ ``` ## Assistant ## Assistant ### Tool: Glob **Args:** ```json { "path": "/tmp/changelog-parser", "pattern": "test/fixtures/**/*" } ``` ## Assistant **Result** (success): ``` No files found ``` ## Assistant ### Tool: Glob **Args:** ```json { "path": "/tmp/changelog-parser", "pattern": "**/fixtures/**/*" } ``` ## Assistant **Result** (success): ``` /tmp/changelog-parser/test/fixtures/comprehensive.md /tmp/changelog-parser/test/fixtures/keep_a_changelog.md /tmp/changelog-parser/test/fixtures/markdown_header.md /tmp/changelog-parser/test/fixtures/underline.md ``` ## Assistant ### Tool: Read **Args:** ```json { "file_path": "/tmp/changelog-parser/test/fixtures/keep_a_changelog.md" } ``` ## Assistant **Result** (success): ``` 1→# Changelog 2→ 3→All notable changes to this project will be documented in this file. 4→ 5→The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), 6→and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). 7→ 8→## [Unreleased] 9→ 10→### Added 11→ 12→- New feature in development 13→ 14→## [1.1.0] - 2024-03-15 15→ 16→### Added 17→ 18→- User authentication system 19→- OAuth2 support 20→ 21→### Fixed 22→ 23→- Memory leak in connection pool 24→ 25→## [1.0.1] - 2024-02-01 26→ 27→### Fixed 28→ 29→- Critical bug in payment processing 30→ 31→## [1.0.0] - 2024-01-15 32→ 33→### Added 34→ 35→- Initial release 36→- Core functionality 37→- Documentation 38→ ``` ## Assistant ### Tool: Read **Args:** ```json { "file_path": "/tmp/changelog-parser/test/fixtures/markdown_header.md" } ``` ## Assistant **Result** (success): ``` 1→# Project Changelog 2→ 3→## 2.0.0 (2024-03-01) 4→ 5→Breaking changes release. 6→ 7→- Removed deprecated methods 8→- New API design 9→ 10→## 1.5.0 11→ 12→Feature release. 13→ 14→- Added caching layer 15→- Performance improvements 16→ 17→### 1.4.2 (2024-01-10) 18→ 19→Patch release. 20→ 21→- Fixed edge case in parser 22→ ``` ## Assistant ### Tool: Read **Args:** ```json { "file_path": "/tmp/changelog-parser/test/fixtures/underline.md" } ``` ## Assistant **Result** (success): ``` 1→Changelog 2→========= 3→ 4→3.0.0 5→===== 6→ 7→Major release with breaking changes. 8→ 9→- Complete rewrite 10→- New architecture 11→ 12→2.1.0 13→----- 14→ 15→Minor release. 16→ 17→- Bug fixes 18→- Documentation updates 19→ 20→2.0.0 21→===== 22→ 23→Initial stable release. 24→ ``` ## Assistant ### Tool: Read **Args:** ```json { "file_path": "/tmp/changelog-parser/test/fixtures/comprehensive.md" } ``` ## Assistant **Result** (success): ``` 1→# Changelog 2→ 3→All notable changes to this project will be documented in this file. 4→ 5→## [Unreleased] 6→ 7→### Added 8→ 9→- Work in progress feature 10→ 11→## [2.0.0-x.7.z.92] - 2024-06-01 12→ 13→### Changed 14→ 15→- Complex prerelease version format 16→ 17→## [1.5.0-beta.2] - 2024-05-15 18→ 19→### Added 20→ 21→- Beta feature with [markdown link](https://example.com) 22→- Another feature 23→ 24→### Fixed 25→ 26→- Bug fix with `inline code` 27→ 28→## [1.4.0-rc.1] - 2024-04-01 29→ 30→Release candidate. 31→ 32→## [1.3.0] - 2024-03-15 33→ 34→### Added 35→ 36→- Feature using both list markers: 37→ * Sub-item with asterisk 38→ * Another sub-item 39→ 40→- Main item with dash 41→ 42→### Deprecated 43→ 44→- Old API endpoint 45→ 46→## [1.2.0] - 2024-02-01 47→ 48→### Security 49→ 50→- Fixed XSS vulnerability 51→ 52→## [1.1.0] - 2024-01-15 53→ 54→### Fixed 55→ 56→- Multiple fixes: 57→ - Fix one 58→ - Fix two 59→ 60→## [1.0.0] - 2024-01-01 61→ 62→Initial release. 63→ 64→### Added 65→ 66→- Core functionality 67→- Documentation 68→ 69→[Unreleased]: https://github.com/example/project/compare/v1.5.0...HEAD 70→[1.5.0]: https://github.com/example/project/compare/v1.4.0...v1.5.0 71→ ``` ## Assistant Good, I have everything I need. Let me also check the vandamme compatibility and CLI files quickly, then write the plan. ## Assistant ### Tool: Read **Args:** ```json { "file_path": "/tmp/changelog-parser/exe/changelog-parser" } ``` ## Assistant **Result** (success): ``` 1→#!/usr/bin/env ruby 2→# frozen_string_literal: true 3→ 4→require "optparse" 5→require "json" 6→require_relative "../lib/changelog/parser" 7→ 8→def load_changelog(path, options) 9→ if path.nil? || path == "-" 10→ $stdin.read 11→ elsif File.directory?(path) 12→ changelog_path = Changelog::Parser.find_changelog(path) 13→ unless changelog_path 14→ warn "Error: No changelog found in directory: #{path}" 15→ exit 1 16→ end 17→ File.read(changelog_path) 18→ elsif File.exist?(path) 19→ File.read(path) 20→ else 21→ warn "Error: File or directory not found: #{path}" 22→ exit 1 23→ end 24→end 25→ 26→def build_parser(content, options) 27→ Changelog::Parser.new( 28→ content, 29→ format: options[:format], 30→ version_pattern: options[:pattern], 31→ match_group: options[:match_group] || 1 32→ ) 33→end 34→ 35→def output_json(data, pretty: false) 36→ json_data = data.transform_values do |entry| 37→ entry.transform_values { |v| v.is_a?(Date) ? v.to_s : v } 38→ end 39→ 40→ if pretty 41→ puts JSON.pretty_generate(json_data) 42→ else 43→ puts JSON.generate(json_data) 44→ end 45→end 46→ 47→options = {} 48→global_opts = OptionParser.new do |opts| 49→ opts.banner = "Usage: changelog-parser [options] [file_or_directory]" 50→ opts.separator "" 51→ opts.separator "Commands:" 52→ opts.separator " parse Parse changelog and output JSON (default)" 53→ opts.separator " list List version numbers only" 54→ opts.separator " show Show content for a specific version" 55→ opts.separator " between Show content between two versions" 56→ opts.separator " validate Validate changelog against Keep a Changelog format" 57→ opts.separator "" 58→ opts.separator "Options:" 59→ 60→ opts.on("-f", "--format FORMAT", %i[keep_a_changelog markdown underline], 61→ "Changelog format (keep_a_changelog, markdown, underline)") do |f| 62→ options[:format] = f 63→ end 64→ 65→ opts.on("-p", "--pattern REGEX", "Custom version header regex pattern") do |p| 66→ options[:pattern] = Regexp.new(p) 67→ end 68→ 69→ opts.on("-m", "--match-group N", Integer, "Regex capture group for version (default: 1)") do |n| 70→ options[:match_group] = n 71→ end 72→ 73→ opts.on("--pretty", "Pretty print JSON output") do 74→ options[:pretty] = true 75→ end 76→ 77→ opts.on("-h", "--help", "Show this help message") do 78→ puts opts 79→ puts "" 80→ puts "Examples:" 81→ puts " changelog-parser parse CHANGELOG.md" 82→ puts " changelog-parser list ." 83→ puts " changelog-parser show 1.0.0 CHANGELOG.md" 84→ puts " changelog-parser between 1.0.0 2.0.0 CHANGELOG.md" 85→ puts " cat CHANGELOG.md | changelog-parser parse -" 86→ exit 87→ end 88→ 89→ opts.on("--version", "Show gem version") do 90→ puts Changelog::Parser::VERSION 91→ exit 92→ end 93→end 94→ 95→begin 96→ global_opts.parse! 97→rescue OptionParser::InvalidOption => e 98→ warn "Error: #{e.message}" 99→ warn global_opts 100→ exit 1 101→end 102→ 103→command = ARGV.shift || "parse" 104→ 105→case command 106→when "parse" 107→ path = ARGV.shift 108→ content = load_changelog(path, options) 109→ parser = build_parser(content, options) 110→ output_json(parser.parse, pretty: options[:pretty]) 111→ 112→when "list" 113→ path = ARGV.shift 114→ content = load_changelog(path, options) 115→ parser = build_parser(content, options) 116→ puts parser.versions.join("\n") 117→ 118→when "show" 119→ version = ARGV.shift 120→ path = ARGV.shift 121→ 122→ # Check if version looks like a file path (missing version argument) 123→ if version && File.exist?(version) && !path 124→ warn "Error: show requires a version argument" 125→ warn "Usage: changelog-parser show [file_or_directory]" 126→ exit 1 127→ end 128→ 129→ unless version 130→ warn "Error: show requires a version argument" 131→ warn "Usage: changelog-parser show [file_or_directory]" 132→ exit 1 133→ end 134→ 135→ content = load_changelog(path, options) 136→ parser = build_parser(content, options) 137→ entry = parser[version] 138→ 139→ unless entry 140→ warn "Error: Version not found: #{version}" 141→ exit 1 142→ end 143→ 144→ puts entry[:content] 145→ 146→when "between" 147→ old_version = ARGV.shift 148→ new_version = ARGV.shift 149→ path = ARGV.shift 150→ 151→ # Check if new_version looks like a file path (missing second version) 152→ if new_version && File.exist?(new_version) && !path 153→ warn "Error: between requires two version arguments" 154→ warn "Usage: changelog-parser between [file_or_directory]" 155→ exit 1 156→ end 157→ 158→ unless old_version && new_version 159→ warn "Error: between requires two version arguments" 160→ warn "Usage: changelog-parser between [file_or_directory]" 161→ exit 1 162→ end 163→ 164→ content = load_changelog(path, options) 165→ parser = build_parser(content, options) 166→ result = parser.between(old_version, new_version) 167→ 168→ if result 169→ puts result 170→ else 171→ warn "Error: Could not find versions in changelog" 172→ exit 1 173→ end 174→ 175→when "validate" 176→ path = ARGV.shift 177→ content = load_changelog(path, options) 178→ parser = build_parser(content, options) 179→ result = parser.parse 180→ errors = [] 181→ warnings = [] 182→ 183→ # Check if any versions were found 184→ if result.empty? 185→ errors << "No versions found in changelog" 186→ end 187→ 188→ # Check for Unreleased section 189→ unless result.key?("Unreleased") 190→ warnings << "No [Unreleased] section found" 191→ end 192→ 193→ # Check for empty versions (Unreleased can be empty) 194→ result.each do |version, entry| 195→ next if version == "Unreleased" 196→ if entry[:content].nil? || entry[:content].strip.empty? 197→ warnings << "Version #{version} has no content" 198→ end 199→ end 200→ 201→ # Check date ordering (should be descending) 202→ dated_versions = result.reject { |_, e| e[:date].nil? } 203→ dates = dated_versions.values.map { |e| e[:date] } 204→ unless dates == dates.sort.reverse 205→ warnings << "Dates are not in descending order" 206→ end 207→ 208→ # Check for missing dates 209→ result.each do |version, entry| 210→ next if version == "Unreleased" 211→ if entry[:date].nil? 212→ warnings << "Version #{version} has no date" 213→ end 214→ end 215→ 216→ # Output results 217→ if errors.empty? && warnings.empty? 218→ puts "Valid changelog with #{result.size} version(s)" 219→ exit 0 220→ end 221→ 222→ errors.each { |e| warn "Error: #{e}" } 223→ warnings.each { |w| warn "Warning: #{w}" } 224→ 225→ exit 1 if errors.any? 226→ exit 0 227→ 228→else 229→ # Treat unknown command as a path (backwards compatibility) 230→ path = command 231→ content = load_changelog(path, options) 232→ parser = build_parser(content, options) 233→ output_json(parser.parse, pretty: options[:pretty]) 234→end 235→ ``` ## Assistant ## Assistant Now I have a thorough understanding of both sides. Let me write the plan. ## Assistant ### Tool: Write **Args:** ```json { "content": "# Go changelog-parser library\n\nPort of the Ruby `changelog-parser` gem as a Go library module at `github.com/git-pkgs/changelog`, following the same patterns as `purl`, `vers`, and `spdx`.\n\n## What it does\n\nParses changelog files (Keep a Changelog, markdown headers, setext/underline style) into structured entries with version, date, and content. Supports auto-detection of format, custom regex patterns, version lookup, and extracting content between versions.\n\n## Files to create\n\nAll under `/Users/andrew/code/git-pkgs/changelog/`:\n\n### `go.mod`\n```\nmodule github.com/git-pkgs/changelog\ngo 1.25.6\n```\nNo external dependencies needed.\n\n### `changelog.go`\nPackage docs and primary API. Exported types:\n\n```go\ntype Entry struct {\n Date *time.Time\n Content string\n}\n\ntype Format int\nconst (\n FormatAuto Format = iota\n FormatKeepAChangelog\n FormatMarkdown\n FormatUnderline\n)\n\ntype Parser struct { ... }\n```\n\nExported functions:\n- `Parse(content string) *Parser` - create parser with auto-detection\n- `ParseWithFormat(content string, format Format) *Parser` - explicit format\n- `ParseWithPattern(content string, pattern *regexp.Regexp) *Parser` - custom regex\n- `ParseFile(path string) (*Parser, error)` - parse a file\n- `FindChangelog(directory string) (string, error)` - find changelog file in dir\n- `FindAndParse(directory string) (*Parser, error)` - find + parse\n\nParser methods:\n- `Versions() []string` - ordered version list\n- `Entry(version string) (Entry, bool)` - get single entry\n- `Entries() map[string]Entry` - all entries (ordered map via slice internally)\n- `Between(oldVersion, newVersion string) (string, bool)` - content between two versions\n- `LineForVersion(version string) int` - line number of version header (-1 if not found)\n\nUse an internal ordered representation (slice of version+entry pairs) to preserve insertion order, since Go maps don't.\n\n### `changelog_test.go`\nTable-driven tests using `testing` package. Port all test cases from the Ruby gem:\n- Empty/nil input\n- Keep a Changelog format (fixture-based)\n- Markdown header format (fixture-based)\n- Underline format (fixture-based)\n- Custom patterns\n- Format auto-detection\n- Between method (descending, ascending, partial bounds, not found)\n- LineForVersion (various header styles, substring avoidance, range avoidance)\n- Edge cases: prerelease, build metadata, empty content, order preservation, markdown links, inline code, nested lists, mixed markers, link references\n\n### `testdata/`\nCopy the four fixture files from the Ruby gem:\n- `testdata/keep_a_changelog.md`\n- `testdata/markdown_header.md`\n- `testdata/underline.md`\n- `testdata/comprehensive.md`\n\n## Regex patterns\n\nDirect ports of the Ruby patterns:\n\n```go\nvar keepAChangelog = regexp.MustCompile(`(?m)^##\\s+\\[([^\\]]+)\\](?:\\s+-\\s+(\\d{4}-\\d{2}-\\d{2}))?`)\nvar markdownHeader = regexp.MustCompile(`(?m)^#{1,3}\\s+v?([\\w.+-]+\\.[\\w.+-]+[a-zA-Z0-9])(?:\\s+\\((\\d{4}-\\d{2}-\\d{2})\\))?`)\nvar underlineHeader = regexp.MustCompile(`(?m)^([\\w.+-]+\\.[\\w.+-]+[a-zA-Z0-9])\\n[=-]+`)\n```\n\n## What to skip\n\n- CLI (git-pkgs main binary would consume this library)\n- HTML rendering (separate concern, not in scope)\n- Vandamme compatibility (Ruby-specific)\n- Validate command (trivial to build on top of the library externally)\n\n## Verification\n\n1. `cd /Users/andrew/code/git-pkgs/changelog && go test ./...` - all tests pass\n2. `go vet ./...` - no issues\n", "file_path": "/Users/andrew/.claude/plans/snuggly-skipping-spindle.md" } ``` ## Assistant **Result** (success): ``` File created successfully at: /Users/andrew/.claude/plans/snuggly-skipping-spindle.md ``` ## Assistant ### Tool: ExitPlanMode **Args:** ```json { "plan": "# Go changelog-parser library\n\nPort of the Ruby `changelog-parser` gem as a Go library module at `github.com/git-pkgs/changelog`, following the same patterns as `purl`, `vers`, and `spdx`.\n\n## What it does\n\nParses changelog files (Keep a Changelog, markdown headers, setext/underline style) into structured entries with version, date, and content. Supports auto-detection of format, custom regex patterns, version lookup, and extracting content between versions.\n\n## Files to create\n\nAll under `/Users/andrew/code/git-pkgs/changelog/`:\n\n### `go.mod`\n```\nmodule github.com/git-pkgs/changelog\ngo 1.25.6\n```\nNo external dependencies needed.\n\n### `changelog.go`\nPackage docs and primary API. Exported types:\n\n```go\ntype Entry struct {\n Date *time.Time\n Content string\n}\n\ntype Format int\nconst (\n FormatAuto Format = iota\n FormatKeepAChangelog\n FormatMarkdown\n FormatUnderline\n)\n\ntype Parser struct { ... }\n```\n\nExported functions:\n- `Parse(content string) *Parser` - create parser with auto-detection\n- `ParseWithFormat(content string, format Format) *Parser` - explicit format\n- `ParseWithPattern(content string, pattern *regexp.Regexp) *Parser` - custom regex\n- `ParseFile(path string) (*Parser, error)` - parse a file\n- `FindChangelog(directory string) (string, error)` - find changelog file in dir\n- `FindAndParse(directory string) (*Parser, error)` - find + parse\n\nParser methods:\n- `Versions() []string` - ordered version list\n- `Entry(version string) (Entry, bool)` - get single entry\n- `Entries() map[string]Entry` - all entries (ordered map via slice internally)\n- `Between(oldVersion, newVersion string) (string, bool)` - content between two versions\n- `LineForVersion(version string) int` - line number of version header (-1 if not found)\n\nUse an internal ordered representation (slice of version+entry pairs) to preserve insertion order, since Go maps don't.\n\n### `changelog_test.go`\nTable-driven tests using `testing` package. Port all test cases from the Ruby gem:\n- Empty/nil input\n- Keep a Changelog format (fixture-based)\n- Markdown header format (fixture-based)\n- Underline format (fixture-based)\n- Custom patterns\n- Format auto-detection\n- Between method (descending, ascending, partial bounds, not found)\n- LineForVersion (various header styles, substring avoidance, range avoidance)\n- Edge cases: prerelease, build metadata, empty content, order preservation, markdown links, inline code, nested lists, mixed markers, link references\n\n### `testdata/`\nCopy the four fixture files from the Ruby gem:\n- `testdata/keep_a_changelog.md`\n- `testdata/markdown_header.md`\n- `testdata/underline.md`\n- `testdata/comprehensive.md`\n\n## Regex patterns\n\nDirect ports of the Ruby patterns:\n\n```go\nvar keepAChangelog = regexp.MustCompile(`(?m)^##\\s+\\[([^\\]]+)\\](?:\\s+-\\s+(\\d{4}-\\d{2}-\\d{2}))?`)\nvar markdownHeader = regexp.MustCompile(`(?m)^#{1,3}\\s+v?([\\w.+-]+\\.[\\w.+-]+[a-zA-Z0-9])(?:\\s+\\((\\d{4}-\\d{2}-\\d{2})\\))?`)\nvar underlineHeader = regexp.MustCompile(`(?m)^([\\w.+-]+\\.[\\w.+-]+[a-zA-Z0-9])\\n[=-]+`)\n```\n\n## What to skip\n\n- CLI (git-pkgs main binary would consume this library)\n- HTML rendering (separate concern, not in scope)\n- Vandamme compatibility (Ruby-specific)\n- Validate command (trivial to build on top of the library externally)\n\n## Verification\n\n1. `cd /Users/andrew/code/git-pkgs/changelog && go test ./...` - all tests pass\n2. `go vet ./...` - no issues\n" } ``` ## Assistant **Result** (error): ``` The user doesn't want to proceed with this tool use. The tool use was rejected (eg. if it was a file edit, the new_string was NOT written to the file). STOP what you are doing and wait for the user to tell you how to proceed. ```