sv2svg 0.6.0

SystemVerilog to SVG using Schemdraw (left-to-right logic diagrams)

sv2svg

Convert SystemVerilog modules into readable logic-diagram SVGs with a single CLI command. sv2svg parses structural HDL, places gates left-to-right, and outputs Schemdraw-based graphics that stay aligned and symmetric.

Highlights

• Deterministic left-to-right layout with minimal crossings
• Automatic input ordering (alphabetical, module ports, or auto)
• Optional grid snapping and symmetry controls
• CLI-first workflow with --help, --version, --style, and --orientation discovery
• Semantic-release driven SemVer tagging and automated PyPI publishing

Installation

Choose one of the following approaches:

• uvx (no install):

  uvx sv2svg --help
  

• uv run:

  uv run sv2svg --help
  

• Virtual environment:

  python3 -m venv .venv
  source .venv/bin/activate
  pip install --upgrade pip
  pip install sv2svg
  

• Editable checkout:

  python3 -m venv .venv
  source .venv/bin/activate
  pip install --upgrade pip
  pip install -e .
  

Quickstart

sv2svg --help
sv2svg --version
sv2svg examples/full_adder.sv --style blueprint --orientation vertical -o full_adder.svg

The last command renders examples/full_adder.sv into an SVG file in the working directory (falls back to full_adder_schemdraw.svg when -o is omitted) using the "blueprint" color preset and a vertical layout.

CLI reference

usage: sv2svg [-h] [-o OUTPUT] [--input-order {alpha,ports,auto}] [--grid-x GRID_X]
              [--grid-y GRID_Y] [--no-symmetry]
              [--style {classic,blueprint,midnight,mono}]
              [--orientation {horizontal,vertical}] [-V]
              input_file

• input_file — source SystemVerilog file with the module to visualize
• -o / --output — target SVG file path (- writes SVG to stdout)
• --input-order — sort inputs alphabetically, preserve declaration order, or auto-detect
• --grid-x, --grid-y — snap coordinates to half-grid (0 disables snapping)
• --no-symmetry — disable mirrored placement for sibling signals
• --style — select a color/line-weight preset for the output (classic, blueprint, midnight, mono)
• --orientation — choose horizontal (default left-to-right) or vertical (top-to-bottom) layout; vertical mode currently produces rotated SVG output only
• -V / --version — print the sv2svg version derived from git metadata

Tips for better diagrams

• Keep each module in its own file and ensure port declarations are explicit.
• The parser expects synthesizable structural constructs; unsupported statements raise errors during generation.
• Use the grid options to align gates when mixing manual annotations with generated drawings.

Development workflow

python3 -m venv .venv
source .venv/bin/activate
pip install --upgrade pip
pip install -e .
python -m sv2svg.cli --version

Run the CLI against fixtures or your own modules; any Python exception surfaces with a clear message.

Testing

The CI workflow (.github/workflows/ci.yml) installs the package in editable mode and performs an import smoke test. Extend it with richer checks as the project grows.

Release automation

• Commits merged to main must follow Conventional Commits so semantic-release can infer version bumps.
• On qualifying commits, the Release workflow updates CHANGELOG.md, tags the release, publishes GitHub release notes, and uploads the built artifacts to PyPI using trusted publishing.
• Local builds without git metadata fall back to version 0.0.0; regular development builds look like 0.2.1.dev0+g8733005aa.d20250922 courtesy of hatch-vcs.

Contributing

Issues and pull requests are welcome. Please include reproduction snippets for parser bugs and respect the release automation by using Conventional Commit messages.

License

MIT