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Third and final pure helper for the coverage-report command. Takes the hash tables produced by parse-lcov and parse-diff-output and returns per-file records ready for the report buffer.
Output is a list of plists sorted by file path. Each record has :path, :changed-lines, :covered-lines, :uncovered-lines, and :tracked. A file that appears in the diff but not in the LCOV data is :tracked nil with both line lists empty. That way the reporter can distinguish "coverage isn't looking at this file" (README edits, test files, config) from "tests didn't exercise this code."
Tests cover Normal (all covered, partial, multiple files sorted), Boundary (file not tracked, tracked file with no covered lines, empty changed-lines from deletion-only hunks, empty inputs), and Error (nil inputs return an empty list instead of erroring).
With this helper in place, the core data pipeline is complete: LCOV file + git diff scope go in, per-file records come out. Next up is the backend registry and the elisp backend, then the cj/coverage-report command ties it all together.
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Second of three pure helpers for the coverage-report command.
cj/--coverage-parse-diff-output is pure. It takes a git unified-diff string and returns a hash table of file to set of added or modified line numbers (based on the +new_start,new_count hunk headers). Files with deletion-only hunks appear in the result with an empty set, so reporters can distinguish "coverage not tracked" from "no changes touched this file."
cj/--coverage-changed-lines wraps that parser with scope dispatch. Scopes are working-tree, staged, branch-vs-main, and branch-vs-parent. Branch-vs-parent takes an optional BASE arg; if omitted, falls back to @{upstream}. Unknown scopes signal user-error.
Tests cover Normal (single hunk, multiple files), Boundary (new file via @@ -0,0, deletion-only, binary markers, single-line hunks without a count, empty input), and Error (malformed hunk headers skipped; unknown scope). Git invocation is stubbed via cl-letf in the smoke test so the parser logic is exercised without shelling out.
Part of the coverage-core work per docs/design/coverage.org.
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First of three pure helpers for the coverage-report command. Reads an LCOV file and returns a hash table of file to set of covered line numbers. Only the SF, DA, and end_of_record fields are interpreted. Other LCOV fields (FN, FNDA, LF, LH, BRDA) are ignored. Malformed DA lines are skipped silently so partial runs still yield usable data.
Tests cover Normal (single file, multiple files, mixed hit counts), Boundary (empty file, spaces in path, extra fields, all-zero hits), and Error (missing file, malformed DA lines).
Part of the coverage-core work per docs/design/coverage.org.
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