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scc 4.0.0 Release Notes

This is a major release. It bundles new modes of operation (MCP, git processing), new cost/output models, broader language support, and a handful of behavioural changes to flag parsing, language detection and config handling that can produce different results than 3.7.0 for the same input — hence the major version bump.

⚠️ Breaking / behavioural changes

These can change scc's output or behaviour for an identical invocation against 3.7.0. Review before upgrading in scripts/CI.

  • Last duplicate flag now wins (#723) — pflag parsing changed so that when a flag is supplied more than once on the command line, the last occurrence takes precedence. Scripts relying on the previous precedence may behave differently.
  • Linguist-inspired language detection (#721) — files may now be classified as different languages than before, shifting per-language counts and the contents of JSON/CSV output.
  • Per-user and per-project config overrides (#724) — scc now reads config overrides from user/project locations. A repository containing a config file will behave differently than under 3.7.0 for the same command.

✨ New features

  • MCP server support (#686) — run scc as a Model Context Protocol server over stdio (--mcp), exposing an analyze tool for programmatic/LLM consumers. Includes sorting/limit tuning and shared settings with the CLI path.
  • Git processing (#707) — integrated git handling, with gc enabled for git operations and help text highlighting the git options.
  • LOCOMO — LLM Output Cost Model (#682) — a new cost calculation aimed at estimating LLM output cost, with configurable cycles.
  • Infographic report output (#709) — new report/infographic rendering.
  • Percentage outputs in JSON (#720) — JSON output now includes percentage figures.
  • Codeberg support (#866376f) — Codeberg as a supported badge/target.
  • External ignore files via --ignore-file — supply additional gitignore-format ignore files from outside the scanned tree (repeatable, order-sensitive, anchored at the scan root; any in-tree .gitignore/.ignore/.sccignore takes precedence). Resolves the long-standing request for global/shared ignore support without scc shelling out to git — point it at ~/.config/git/ignore directly, or set it once in a .scc file via SCC_CONFIG_PATH. Backed by CustomIgnoreFiles in gocodewalker.

🗣 Language support

  • Linguist-inspired language detection (#721).
  • New / updated languages: Mojo (#685), Zen C (#708), XHTML (#681), IEC61131-3 Siemens extensions (#702), Mog (#683), Phoenix LiveView fix (#722).
  • Patch/diff: recognize .diff files as Patch (#705).
  • Rust: count the ? try operator toward complexity (#701).
  • C/C++ language information updated (#691); CUDA updated (#693).
  • New "move" classifier (#703).
  • Python: prevent apostrophes in docstrings from breaking parsing (#695); extra docstring test coverage.

🐛 Fixes

  • Fix potential MCP issue (a148002) and MCP settings/sorting/limit tweaks.
  • Fix circular symlinks bug (#694).
  • Catch error when mapping to an unknown language (30fa28a); fix a panic (dc8c92e).
  • Fix for issue #412 (#719).
  • WIP/fix for issue #531 (#714).

🏎 Performance & internals

  • Reduce string allocations (#687).
  • Minor performance tweaks (#711) and general cleanup/optimization (#680).
  • Apply go fix suggestions (#712); convert more shell tests to Go tests (#696).
  • Automate file generation and add CI tests (#688, #706); update to latest Go and refresh dependencies.

🗒 To discuss / follow-up

  • Remaining git subprocess shell-out — remoteOriginName in processor/report.go still runs git config --get remote.origin.url to derive the HTML report title. This is the only place scc shells out to the git binary (the rest use the go-git library or gocodewalker.FindRepositoryRoot). Decide whether to drop it (fall back to the path basename) or read it via go-git's config instead, so scc has no hard dependency on a git binary being installed.

Generated from the commit history between v3.7.0 and the 4.0.0 release.