feat(core): analyze a git commit/tree-ish directly via --git-hash - #36
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Adds GitSnapshotExtractor, which shells out to git (ls-tree, cat-file --batch) to dump a commit's tracked blobs into a temp directory without checking it out. AnalyzeHandler scans the dump like --list-file and remaps reported paths back to git-relative paths before rendering. Symlink and submodule tree entries are skipped and reported.
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Summary
GitSnapshotExtractor(src/Sloc.Core/GitSnapshotExtractor.cs), which shells out togit(ls-tree -r -z,cat-file --batch) to dump every tracked blob of a commit/tree-ish into a temp directory, without checking it out. Symlink and submodule tree entries are skipped and reported.--git-hash <commit>CLI option (mutually exclusive with--list-file);pathis used as the repo root to query.AnalyzeHandlerscans the extracted temp files via the existing--list-filecode path (DirectoryScanner.ScanFiles), then remaps reported paths from temp paths back to git-relative paths before rendering/--baseline/--unique, and cleans up the temp directory in afinally.CLAUDE.md.Test plan
dotnet build Sloc.slnx— 0 warnings, 0 errors.dotnet test Sloc.slnx— 295/295 passing, including new tests:tests/Sloc.Core.Tests/GitSnapshotExtractorTests.cs— HEAD extraction matches working tree, older-commit extraction reflects historical state, symlink entries are skipped, binary content is dumped byte-for-byte, invalid hash / non-repo path throwGitSnapshotException.tests/Sloc.Cli.Tests/AnalyzeHandlerGitHashTests.cs—--git-hash HEADreports git-relative paths and matches a normal scan's totals; invalid hash returnsExitCode.Error; temp directory is cleaned up afterExecutereturns.sloc . --git-hash HEAD -f jsonagainst this repo and confirmed output paths are git-relative and uncommitted files are correctly excluded.