Contributing to the NMODL Framework

We would love for you to contribute to the NMODL Framework and help make it better than it is today. As a contributor, here are the guidelines we would like you to follow: - Question or Problem? - Issues and Bugs - Feature Requests - Submission Guidelines - Development Conventions

Got a Question?

Please do not hesitate to raise an issue on github project page.

Found a Bug?

If you find a bug in the source code, you can help us by submitting an issue to our GitHub Repository. Even better, you can submit a Pull Request with a fix.

Missing a Feature?

You can request a new feature by submitting an issue to our GitHub Repository. If you would like to implement a new feature, please submit an issue with a proposal for your work first, to be sure that we can use it.

Please consider what kind of change it is:

For a Major Feature, first open an issue and outline your proposal so that it can be discussed. This will also allow us to better coordinate our efforts, prevent duplication of work, and help you to craft the change so that it is successfully accepted into the project.
Small Features can be crafted and directly submitted as a Pull Request.

Submission Guidelines

Submitting an Issue

Before you submit an issue, please search the issue tracker, maybe an issue for your problem already exists and the discussion might inform you of workarounds readily available.

We want to fix all the issues as soon as possible, but before fixing a bug we need to reproduce and confirm it. In order to reproduce bugs we will need as much information as possible, and preferably a sample MOD file or Python example.

Submitting a Pull Request (PR)

When you wish to contribute to the code base, please consider the following guidelines:

Make a fork of this repository.
Make your changes in your fork, in a new git branch:
```
git checkout -b my-fix-branch master
```
Create your patch, including appropriate test cases.
Enable NMODL_TEST_FORMATTING CMake variable to ensure that your change follows the coding conventions of this project when running the tests. The formatting utility can also be used directly:
- to format CMake and C++ files: cmake/hpc-coding-conventions/bin/format
- to format only the C++ files: cmake/hpc-coding-conventions/bin/format --lang c++
- to format a subset of files or directories: cmake/hpc-coding-conventions/bin/format src/codegen/ src/main.cpp
- to check the formatting of CMake files: cmake/hpc-coding-conventions/bin/format --dry-run --lang cmake
Run the full test suite, and ensure that all tests pass.
Commit your changes using a descriptive commit message.
```
git commit -a
```
Push your branch to GitHub:
```
git push origin my-fix-branch
```
In GitHub, send a Pull Request to the master branch of the upstream repository of the relevant component.
If we suggest changes then:
- Make the required updates.
- Re-run the test suites to ensure tests are still passing.
- Rebase your branch and force push to your GitHub repository (this will update your Pull Request):
```
git rebase master -i
git push -f
```

That’s it! Thank you for your contribution!

After your pull request is merged

After your pull request is merged, you can safely delete your branch and pull the changes from the main (upstream) repository:

Delete the remote branch on GitHub either through the GitHub web UI or your local shell as follows:
```
git push origin --delete my-fix-branch
```
Check out the master branch:
```
git checkout master -f
```
Delete the local branch:
```
git branch -D my-fix-branch
```
Update your master with the latest upstream version:
```
git pull --ff upstream master
```

Development Conventions

New Lines

When generating/printing code it’s important to use add_newline to start a new line of code. When printing a string containing multiple lines, i.e. one that contains a "\n" one must use add_multi_line.

It’s important that NMODL knows the line number it’s currently on.

Formatting

Run the HPC coding conventions formatter to format all source files:

cmake/hpc-coding-conventions/bin/format

The HPC coding conventions formatter installs any dependencies into a Python virtual environment.

Validate the Python package

You may run the Python test-suites if your contribution has an impact on the Python API:

setup a sandbox environment with either virtualenv, pyenv, or pipenv. For instance with virtualenv: python -m venv .venv && source .venv/bin/activate
build the Python wheel with the command: python -m pip wheel . --no-deps
execute the unit-tests for the wheel: bash packaging/test_wheel.bash $(command -v python) WHEEL, where WHEEL is the path to the wheel generated in the previous step.

Memory Leaks and clang-tidy

If you want to test for memory leaks, do :

valgrind --leak-check=full --track-origins=yes  ./bin/nmodl_lexer

Or using CTest as:

ctest -T memcheck

If you want to enable clang-tidy checks with CMake, make sure to have CMake >= 3.15 and use following cmake option:

cmake .. -DENABLE_CLANG_TIDY=ON

Blaming NMODL

While developing NMODL one may want to know which line of code in NMODL produced a particular line of code in the generated file, e.g. when faced with a compiler error such as

hodhux.cpp:105:26: error: ‘coreneuron’ has not been declared
  105 |         double* celsius{&coreneuron::celsius};
      |                          ^~~~~~~~~~

One can find the line by doing:

$ nmodl hodhux.mod ... blame --line 105

which will print a backtrace every time NMODL writes to line 105. While this is useful for finding the line responsible for printing, i.e. convert AST to C++, that line it doesn’t immediately explain why the AST ended up that way. Currently, we don’t have a tool for the latter.