covisible 0.2.1

PR-first code coverage report generator with modern UI

Covisible

PR-first code coverage report generator with modern UI

Covisible generates beautiful, interactive coverage reports focused on what matters: your PR changes.

Features

• PR-first view — Shows coverage for new/modified lines, not the entire repo
• Diff-based analysis — Integrates with git diff to highlight what changed
• Modern UI — Dark/light theme, interactive charts, instant search
• Smart summary — "−1.3% coverage, 3 new uncovered lines" instead of "83.42%"
• 1-click drill-down — PR → file → function → line
• Baseline comparison — Compare current coverage with previous runs

Installation

pip install covisible

Or install from source:

git clone https://github.com/LaGrunge/covisible
cd covisible
pip install -e ".[dev]"

Usage

Covisible is a command group. The main command is report; diff, files, and summary are console-only helpers. Coverage input is auto-detected: .json (and *.gcov.json) is parsed as gcov JSON, everything else as LCOV .info.

Generate a report (PR coverage)

covisible report \
  --current coverage.info \
  --baseline baseline.info \
  --git-diff HEAD~1..HEAD \
  --output report/ \
  --format both

Without --git-diff/--diff-file you get a whole-project report; with one of them the report focuses on new/modified lines.

To render the actual source code, covisible locates each file by the path recorded in the coverage data, then by --source-root — joining relative paths and matching absolute build paths by their longest existing suffix (so a foreign build prefix like /home/ci/build/... still resolves). Files it cannot find are rendered with coverage but no code, and the run prints how many were missing.

Generate gcov JSON coverage

# After running tests with coverage enabled
find . -name "*.gcno" -exec gcov --json-format {} \;
# Or use gcov on specific files
gcov --json-format --stdout myfile.cpp > coverage.json

report options

Option	Description
-c, --current	Coverage file (gcov JSON or lcov.info) — required. Repeatable: pass -c several times to merge shards/test runs (hit counts are summed)
-b, --baseline	Baseline coverage for comparison (optional)
--git-diff	Git diff range (e.g., main..HEAD)
--diff-file	Path to unified diff file
-o, --output	Output directory for HTML report (default: coverage-report/)
--format	Output format: html, json, or both (default: html)
--config FILE	Read option defaults from a TOML file (default: ./.covisible.toml if present). CLI flags override the file
--repo	Path to git repository (for --git-diff / title)
--source-root	Directory where the source files live, used to render code when coverage paths are absolute build paths or relative to another root (defaults to --repo)
--title	Report title (default: Covisible: <project>)
--blame / --no-blame	Include git blame analysis for uncovered code
--branches / --no-branches	Show branch coverage columns in the report (off by default; only rendered when the coverage data has branch info)
--range LOW,HIGH	Coverage color thresholds as percentages: below LOW is red, LOW–HIGH yellow, at or above HIGH green (default: 50,80). Applies to the summary cards, module-table bars, sunburst and treemap
--precision N	Decimal places shown for coverage percentages everywhere (default: 1)
--badge FILE	Also write a shields-style SVG coverage badge to FILE: rounded line-coverage %, colored by --range, with the covisible eye logo
--cobertura FILE	Also write a Cobertura XML report to FILE for CI tools (Jenkins, GitLab, Azure DevOps, SonarQube)
--history FILE	Append this run to a JSON history file and render a coverage trend chart (commit it / cache it in CI to accumulate history)
--commit SHA	Commit label for the --history entry (default: auto-detected from --repo)
--branch NAME	Branch label for the --history entry (default: auto-detected from --repo; distinct from --branches)
--trend / --no-trend	Render the coverage trend chart from --history data (default on). --no-trend keeps recording history but hides the chart
--fail-under PCT	Exit with status 1 if overall line coverage is below PCT (the report is still written)
--fail-under-new PCT	Exit with status 1 if coverage of new/changed lines is below PCT (PR mode only)
--exclude GLOB	Glob of files to exclude (repeatable, e.g. --exclude '*_test.cpp')
--include GLOB	Keep only files matching this glob, applied after --exclude (repeatable)
--omit-lines REGEXP	Ignore source lines matching this regex, e.g. --omit-lines 'assert' (needs source on disk; repeatable)
--substitute s/RE/REPL/	Rewrite coverage file paths with a sed-style regex so they match source on disk, e.g. --substitute 's#/build/##' (repeatable)
--prefix PREFIX	Strip a leading path PREFIX from coverage file paths
--strip N	Strip the first N leading directory levels from coverage file paths
--ignore-config	Path to an ignore config (YAML/JSON) with exclude/include/line_markers

The report ships a light/dark theme that follows the OS prefers-color-scheme by default, with a header toggle (or press t) that persists your choice.

Config file

Put commonly-used options in .covisible.toml (auto-discovered in the current directory, or point at one with --config). CLI flags always override it:

[report]
range = "50,75"
precision = 2
branches = true
exclude = ["*_test.cpp", "third_party/*"]
fail_under = 80
fail_under_new = 90
badge = "coverage.svg"
cobertura = "coverage.xml"

CI gating

Merge shards, fail the build under a threshold, and emit artifacts CI can ingest:

covisible report -c shard1.info -c shard2.info -o report/ \
  --git-diff origin/main..HEAD --repo . \
  --fail-under 80 --fail-under-new 90 \
  --cobertura coverage.xml --badge coverage.svg --history history.json

Other commands

# CodeCov-style coverage diff (console), optional markdown brief for CI comments
covisible diff coverage_new.info -b coverage_old.info --markdown brief.md

# List files by coverage (-n 0 lists all, no limit)
covisible files coverage.info --sort uncovered --limit 20

# One-file summary
covisible summary coverage.info

Excluding files and lines

Pass --exclude one or more times, or point --ignore-config at a YAML/JSON file:

# covisible-ignore.yaml
ignore:
  exclude:
    - "*_test.cpp"
    - "third_party/*"
  line_markers:
    - "// LCOV_EXCL_LINE"
    - "# pragma: no cover"

Excluded files are dropped from the report; lines matched by a marker (or a LCOV_EXCL_START/STOP block) are removed from their file's coverage.

Development

# Install dev dependencies
pip install -e ".[dev]"

# Run tests
pytest

# Lint
ruff check src tests
mypy src

License

MIT