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jeremiah-c-leary / vhdl-style-guide

Style guide enforcement for VHDL
GNU General Public License v3.0
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beautify coding guide linting standard style styleguide vhdl

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VHDL Style Guide (VSG)

Coding style enforcement for VHDL.

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Announcements

Update 02/10/2024

For Release 3.22.0.

In an attempt to be more consistent in the configuration files, the following options are changing from camelCase to snake_case:

+---------------+--------------+ | option | Changed To | +===============+==============+ | indentSize | indent_size | +---------------+--------------+ | indentStyle | indent_style | +---------------+--------------+

An Error message will be generated if the old style is encountered. A reminder to change the option to snake_case will be given.

Regards,

--Jeremy

.. image:: https://github.com/jeremiah-c-leary/vhdl-style-guide/blob/master/docs/img/vim_macro.gif

Table of Contents

Overview

VSG was created after participating in a code review where a real issue in the code was masked by a coding style issue. A finding was created for the style issue, while the real issue was missed. When the code was re-reviewed, the real issue was discovered.

Depending on your process, style issues can take a lot of time to resolve.

. Create finding/ticket/issue

. Disposition finding/ticket/issue

. Fix

. Verify fix

Spending less time on style issues leaves more time to analyze the substance of the code. This ultimately reduces the amount of time performing code reviews. It also allows reviewers to focus on the substance of the code. This will result in a higher quality code base.

Key Benefits

VSG allows the style of the code to be defined and enforced over part or the entire code base. Configurations allow for multiple coding standards.

Key Features

Known Limitations

VSG is a continual work in progress. As such, this version has the following known limitations:

Installation

You can get the latest released version of VSG via pip.

.. code-block:: bash

pip install vsg

The latest development version can be cloned...

.. code-block:: bash

git clone https://github.com/jeremiah-c-leary/vhdl-style-guide.git

Install prerequisites.

.. code-block:: bash

pip install tox

Build locally, artifacts will appear in dist directory.

.. code-block:: bash

tox

Usage

VSG is a both a command line tool and a python package. The command line tool can be invoked with:

.. code-block:: bash

$ vsg usage: VHDL Style Guide (VSG) [-h] [-f FILENAME [FILENAME ...]] [-lr LOCAL_RULES] [-c CONFIGURATION [CONFIGURATION ...]] [--fix] [-fp FIX_PHASE] [-j JUNIT] [-js JSON] [-of {vsg,syntastic,summary}] [-b] [-oc OUTPUT_CONFIGURATION] [-rc RULE_CONFIGURATION] [--style {indent_only,jcl}] [-v] [-ap] [--fix_only FIX_ONLY] [--stdin] [--quality_report QUALITY_REPORT] [-p JOBS] [--debug] [FILENAME ...]

Analyzes VHDL files for style guide violations. Reference documentation is located at: http://vhdl-style-guide.readthedocs.io/en/latest/index.html

positional arguments: FILENAME File to analyze

options: -h, --help show this help message and exit -f FILENAME [FILENAME ...], --filename FILENAME [FILENAME ...] File to analyze -lr LOCAL_RULES, --local_rules LOCAL_RULES Path to local rules -c CONFIGURATION [CONFIGURATION ...], --configuration CONFIGURATION [CONFIGURATION ...] JSON or YAML configuration file(s) --fix Fix issues found -fp FIX_PHASE, --fix_phase FIX_PHASE Fix issues up to and including this phase -j JUNIT, --junit JUNIT Extract Junit file -js JSON, --json JSON Extract JSON file -of {vsg,syntastic,summary}, --output_format {vsg,syntastic,summary} Sets the output format. -b, --backup Creates a copy of input file for comparison with fixed version. -oc OUTPUT_CONFIGURATION, --output_configuration OUTPUT_CONFIGURATION Write configuration to file name. -rc RULE_CONFIGURATION, --rule_configuration RULE_CONFIGURATION Display configuration of a rule --style {indent_only,jcl} Use predefined style -v, --version Displays version information -ap, --all_phases Do not stop when a violation is detected. --fix_only FIX_ONLY Restrict fixing via JSON file. --stdin Read VHDL input from stdin, disables all other file selections, disables multiprocessing --quality_report QUALITY_REPORT Create code quality report for GitLab -p JOBS, --jobs JOBS number of parallel jobs to use, default is the number of cpu cores --debug Displays verbose debug information

Here is an example output running against a test file:

.. image:: https://github.com/jeremiah-c-leary/vhdl-style-guide/blob/master/docs/img/fixing_single_file.gif

pre-commit Integration

Here is an example of .pre-commit-config.yaml file:

.. code-block:: yaml

repos:

Documentation

All documentation for VSG is hosted at read-the-docs <http://vhdl-style-guide.readthedocs.io/en/latest/index.html>_.

Contributing

I welcome any contributions to this project. No matter how small or large.

There are several ways to contribute:

Please refer to the documentation hosted at read-the-docs <http://vhdl-style-guide.readthedocs.io/en/latest/index.html>_ for more details on contributing.